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For Internal Circulation Only
PRESERVATION PROCEDURE
ANDCONDITION MONITORING
FOR
SPARE PARTS OF TRANSMISSION SYSTEM
EQUIPMENT AND
SPECIAL TOOLS & PLANTS
CORPORATE OPERATION SERVICES
POWERGRID CORPORATION OF INDIA LTD.
DECEMBER, 2004
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INDEX
S. NO. DESCRIPTIOPN PAGE NO.
1. PRESERVATION PROCEDURE AND CONDITION
MONITORING FOR SPARE PARTS AND SPECIAL TOOLSAND PLANT
1-22
2. GENRAL LAYOUT OF STORAGE AREA 23
3. TABLE FOR PRESERVATION PROCEDURES 24-30
4. TABLE FOR CONDITION MONITORING CHECKS 31-37
5. FORMAT FOR MONTHLY CHECK LISTS 38-40
6. FORMAT FOR SIX MONTHLY CHECK LISTS 41-43
7. FORMAT FOR YEARLY CHECK LISTS 44-45
8. FORMAT FOR 5 YEARLY CHECK LISTS 46-47
DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
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POWERGRID PRESERVATION PROCEDURE
PRESERVATION PROCEDURE
AND
CONDITION MONITORINGFOR
SPARE PARTS OF TRANSMISSION SYSTEM
EQUIPMENT
AND
SPECIAL TOOLS PLANTS
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
PRESERVATION PROCEDURE AND CONDITION MONITORING FOR SPARE PARTS OF
TRANSMISSION SYSTEM EOUIPMENT AND SPECIAL TOOLS PLANTS
1. INTRODUCTION
Large quantities of stores deteriorate during storage due to number of causes and
become unserviceable / scrap and cause loss to the Company. The care of materials
in store is therefore, an important aspect of O&M activities and requires regular vigil.
2. CAUSES OF DAMAGES
Deterioration can be classified based on the following causes:-
i) Biological
ii) Non-biological.
2.1. DAMAGE DUE TO BIOLOGICAL CAUSES
Damages arc caused to stores by insects and organism such as white ants, Mildew,
Goons and Rots, which are usually referred to as Biological Damages.
2.1.1 WHITE ANTS
These are very common in India and if ignored they are capable of causing endless
damage. The White ant is usually active during the monsoon and prefers moist soil
and may attack stores in contact with walls or roof or ground common forms of wood,
wooden articles, papers books, cloth and clothing fall easy prey to them.
2.1.1.1 PREVENTIVE MEASURES
The use of coal tar is very effective and in-expensive to use. Where the presence of
white ant is suspected the floors especially the corners, wooden piles, racks and
furniture coming in direct contract with the ground should occasionally receive a
coating of coal tar.
Apart from the above the following precautions should also be taken:
i) Stores should be kept off the ground at least 300 mm high on a platform made of
metal or any material not susceptible to white ant damage.
ii) The floor of godowns and storehouses should be made of cement concrete. All
cracks should be repaired promptly as and when they developed.
iii) Stores should not be allowed to touch roof or walls.
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2.1.2 ROT AND MILDEW
Rot and Mildew are names given to organism belonging to the plant kingdom, which
also cause considerable damage to stores. Mildew can be defined as low form of alarge group of plants known as 'FUNGI'. The 'ROT' may in general be defined as stateof deterioration of stores caused by micro-organism called bacteria. Both of themattack easily all stores, which are of plant origin i.e. contains cellulose of some form orthe other. Rot and Mildew generally take place during monsoon and in places where itis damp and wet.
2.1.2.1 PREVENTIVE MEASURES
i. All godowns and store houses must be opened daily to allow free ventilation
particularly during the monsoon season.
ii. Stores must be kept away from walls and off the ground.
iii. Stores must not be packed and stacked while wet or damp.
iv. Store material should be frequently turned over wherever applicable.
v. Stores must be inspected frequently and should be immediately treated when
any damage is noticed.
2.1.2.2 CURATIVE MEASURES
There are a few curative measures, which are of general application:
i. Damaged material should be exposed to the Sun for a few days with a frequentturn over.
ii. Any insecticide may be used or sprayed on the damaged portion.iii. Oils and Chemicals used to kill insect pests are effective against rot and mildew
also.
Before any treatment is given, the damaged stores material should be segregated fromthe good ones.
2.2 DAMAGE DUE TO NON-BIOLOGICAL CAUSES
Rusting of iron stores, caking of paints, hardening of rubber are such common
experiences and these are some of the most important types of non- biological
damage to general stores.
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The drums must be stored lying on their cylindrical surface on wooden sleeper andturned so that both caps lie on a horizontal line. The covered store where oil drumsare to be stored shall be prepared preferably with sand bed with raised platform of
minimum 300 mm or maximum flood level of that area whichever is higher.
Monthly inspection of condition of oil drums in respect of any leakage to be ensuredand leaking drums should be taken out of the stock.
2.2.2.1 STORAGE OF OIL IN TANKS
The size of the storage tank for oil can vary but a volume of 6-15m3 have proved to besuitable for storing the oil for longer duration or for circulation when required. Thestorage tanks should be sand blasted inside or painted suitably for oil storage purposeand fitted with suitable top inlet and bottom outlet, dehydrating breathers, oil levelindicators, provision of drain valve and manhole covered with effective sealing. Before
usage, the tanks should be inspected and if necessary cleaned.
The condition of dehydrating breathers shall be inspected periodically say once in 3months and if required the dehydrating material should be reconditioned or replaced.The BDV of the Oil shall be checked up once in 6 monthly.
2.2.3 RUBBER AND RUBBER GOODS
Rubber is a vegetable product and most articles made for it are subject to deteriorationat a rate depending upon the climate condition under which they are stored.
It is desired that the date of delivery of these items are noted in the register with theexpiry date of material depending on the manufacturer’s recommendation. Theconsumption of these type of material shall be always “FIRST IN” and “FIRST OUT”.
2.2.3.1 STORAGE CONDITIONS
i. Effect of sunlight: Sunlight has a very bad effect on rubber. Stocks should notbe exposed to it directly.
ii. Ventilation: Air currents in the store room should be avoided, especially if theincoming air is drawn from brilliant sunlight as it has been found that such aircarries with it the very harmful effect of actinic rays.
iii. Humidity: During the period of very low atmospheric humidity, i.e. during the drysummer months, open dishes of water should be placed in the store room orsome arrangement made for periodic wetting of the floor.
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iv. Storage Racks: Actual storage of rubber goods should be open frame work orracks to give a free but not agitated circulation of air. The lowest bin should be ata height sufficient to provide reasonable floor clearance. Tyres should alwaysstand on end and never be stacked horizontally one upon another, otherwisedistortion of the lower tyres occur.
3.0 PROCEDURE REGARDING INDOOR AND OUTDOOR STORING AREA
3.1 INDOOR OR COVERED STORE
The main building should avoid large unprotected or easily accessible windows and
wide ventilators. Brick buildings or corrugated sheds with bricked plinths are the most
suitable enclosure for store houses, while designing a store building or deciding
alterations or extension to existing structures 'intruders' point of view must always be
borne in mind. While releasing the construction drawings for the switchyard, theformation level of the stores also to be worked out based on the contour level data
furnished by site so that the storage area shall be necessarily at a higher formation
level to avoid water logging. Suitable entry and exit points also are to be considered.
Racks for storing valuable and pilferage-able nature of items should be designed in
such a way, so that these may afford full protection to the materials stocked therein.
While stocking machinery and plant, lorries, water pumps etc. on long-term basis, allimportant copper or brass mountings should be removed and kept inside with safecustody.
Suitable design of illumination and using of FRLS cables to be considered to preventany fire hazard and its spreading to the adjacent area. And also suitable fire alarmsystem to be incorporated along with provision of exhaust fans with guard shall bemade in the store room. Special care should be given for warming such that spaceheater in MOM box can be connected.
3.2 OUT DOOR STORE
For storage of outdoor equipment a concrete base to be prepared and the size may befixed to approximately 400 sq. m. However the area mentioned above is indicative onlyand may be assessed on the exact requirement.
The level of this platform should be minimum 300 mm above ground level or above themaximum flood level of that area.
It shall be ensured that under no circumstances the water level shall rise above theflooring level. Materials shall not be stored at places prone to water logging.
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Further the outdoor storage should be at least 100 meter away from the energized bayequipment. This will avoid the consequential damages in case of blasting of oil filledequipment or other equipment subjected to explosion during operation.
For easy access of the stored equipment, it is desirable that a cranable road all aroundis available. Further in order to load/unload of material to the open storage area asuitable point should be marked at a height matching with the base of truck with theopen storage area. There will be a negative slope below the ground level such thattruck level match.
The fire hydrant points (say 2/3 nos.) may be suitably located if available at the sub-station. Other fire fighting equipment like water buckets, sand buckets etc. are also tobe placed at indoor as well as outdoor storage area. Few tap water points should alsobe provided surrounding the storage area. A low cost fire fighting arrangement withseparate bore- well, storage tank, booster pump and flexible hoses can be envisagedwhere extension of hydrant line from substation is not economical or not technicallyfeasible.
The area around the open storage shall be well illuminated and fencing around theopen storage area shall be ensured.
3.3 GENERAL STORING
AIl equipments including mandatory spares on receipt shall be inspected afterremoving the packing before storing and in case of delay in erection activities, theequipment should be packed again using the same packing material.
The equipments that are to be stored outdoor in packed condition must be properlywrapped with polythene covers.
Before using any spare, it has to be verified for its functional testing and other
satisfactory tests covered under Pre-commissioning procedures.
Scrap and unused material shall be removed from the main storage area and placed ata location identified as scrap area.
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During storage of the equipment, it is to be ensured that storage, handling instructionsshould be retained along with the packing in moisture protective cover as well as in theclassified documentation file.
3.4 PROTECTION OF MATERIAL
The instinct of theft is human weakness and its active manifestation is dependent uponthe ease with which it can be fully or partially satisfied. The intrinsic value of an item oritems need not always be a primary consideration. The basic principle of avoiding atheft, therefore, is to make its execution an extremely difficult if not an impossible task.This may be accomplished in several ways.
3.4.1 FENCING
The storage area shall be provided with a fencing of barbed wire surrounding the openstorage area & storage shed. If boundary wall is provided in the surrounding of store,the barbed wire fencing can be provided over the top of the wall and charged with lowvoltage ( say 50 Volt AC). An alarm system may be provided to warn the security staff.
3.4.2 YARD LIGHTING
It may not be necessary during night to keep lights burning inside the locked godowns,but the outside yards, verandahs, corridors and entire neighborhood of the boundarywall should be adequately illuminated. Adequate number of watch towers all alongnear to the store to be provided.
3.4.3 STAMPING OF COMPANY MATERIALS
There are possibilities of certain items of stores being misused or misappropriatedwhile in the custody of the consumers. Quite a number of items are capable of beingutilized for private purposes and being offered to outsiders for sale. An effective way todiscourage misuse and pilferage is to mark or stamp such items suitably.
3.4.4 CARE OF MATERIAL AGAINST FIRE
Losses by fire can be classified as accidents and like most accidents they are
preventable. In a store Depot/ Store House there are several sources of fire which, ifuncontrolled, are likely to destroy inflammable goods of which large quantities aremostly held in stocks.
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3.4.4.1 CAUSES OF FIRE AND THEIR PREVENTION
3.4.4.1.1 ELECTRIC SHORT CIRCUIT
Any short circuit sparking or smell of burnt rubber should be immediately reported toconcerned executive for action.
3.4.4.1.2 SPARKS FROM UNINTENTIONAL HUMAN
Danger from human elements is limited to combustible material stocked in yards whichmay be due to unintentional disposal of butts of BIDDIES / CIGARETTES, Timber, firewood, dry grass, coal stacks, and rubbish heaps etc. are the items which are likely tocatch fire and may in turn transmit the conflagration to a larger area. Yards must befreed of all unnecessary Scraps / Garbage etc. and weed especially before theapproach of dry season. Further in order to avoid Fire Hazards, suitable anti-weedtreatment as being done for switchyard need to be done for out door stores also. SignBoards of NO SMOKING/ SMOKING PROHIBITED ZONE may be placed at variousplaces of INDOOR / OUT DOOR store.
3.4.4.1.3 AUTO-COMBUSTION
In summer oil soaked fire wood or cotton waste are likely to ignite. Cotton waste orother rags used for cleaning tanks or other implements in an oil godown or elsewhereshould not be left inside the godown nor thrown carelessly amidst dry grass or stacksof wooden sleepers etc but should be thrown into the bins specially provided for thepurpose.
3.4.4.1.4 FIRE FIGHTING APPLIANCES
The fire fighting appliances should be provided at suitable points according to the needof the Store Depot/Store Houses
i. Water Buckets.
ii. Sand Buckets.
iii. Chemical Extinguishers.
iv. Hydrants if available in S/S. or water tap points or storage water
v. Chemical extinguishers should be re-charged as per advice of manufacturer
3.4.4.1.5 COMMUNICATION AND ROADS If the store yards arc sufficiently large, metalled roads and well kept paths shall beprovided to enable fire engines and large chemical extinguishers to reach all pointswhere inflammable articles are stacked.
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3.4.4.1.6 FIRE ALARM
Suitable fire alarm equipment according to the needs of the place with a extension tocontrol room be provided to bring to the notice of every one the accident of fire.
4.0 In order to make a standard preservation procedure for all the equipmentof POWERGRID Transmission System, the followings practices shall befollowed
4.1 TRANSFORMER/ REACTORS AND COMPONENTS
For long time storage of supplied goods for Transformer and Reactors, themanufacturer’s recommendations are to be followed. In this document it is only astandard practice or guideline to be followed, however it may differ with that ofmanufacturer’s recommendation at places.
i. The storing place should be available for inspection and maintenance of thetransformer/reactor. The bedding for the transformer / reactor should be largerthan the bottom surface of the transformer/reactor. The transformer/ reactor isplaced on raised beams so that good ventilation is obtained underneath thetransformer bottom.
ii. Normally the transformer/reactors are dispatched to site dismantled and filledwith Dry air or Nitrogen. The transformer may be stored up to 3 months afterarrival at the site without oil filling. During the storing time the dry air or Nitrogenfilling shall be maintained, say 20 KPA (0.2 bar) at 20° C. The due point of Dryair or nitrogen shall be < -25 ° C and purity of nitrogen shall be > 99 %.
4.1.1 Independent of the duration of the storing time, the direction given belowshall apply for all the components and accessories.
4.1.1.1 STORING INDOORS IN A DRY COVERED AREA
i. Insulation material such as papers, pressboard, bakelite, cotton tapes etc.ii. Chemicals such as solvents, glues, varnishes, hardeners.
iii. Breathers, drying agents.iv. Terminal boxes, connection boxes, control cabinets and driving mechanisms.
v. Turrets with and without build-in current transformer.
vi. Fan, fan motors, pumps and coolers.
vii. Gas relays, oil level indicators, thermometers, flow indicators, manometers,explosion vents, pressure relay, valves etc.
viii. Manual operating gear.
ix. Paper to oil conservators, coolers, turrets ect.
x. Transformer wheels (transport arrangement).
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"The control cabinets shall be carefully be unpacked and stored in upright positionindoor. The heating element of the control cabinet could be electrically connected.Before such electrical connection all transport supports inside the cabinet must beremoved and carefully checked that nothing is in contact with the heating elements
inside the cabinet. Also the air holes for ventilation shall be checked to be open."
Only the part of HEATER illumination circuit of the control cabinet is to be electricallyconnected and all other parts are to be isolated.
Protection Earthing of the Control Cabinets is recommended during the storage andshall be arranged by connection to Earthing Clamp outside the Control Cabinets.
4.1.1.2 STORING OUT DOORS
i. Oil conservator with blanking plates for all opening.
ii. Radiators and coolers with blanking plates for all opening.
iii. Consoles & frames for oil conservator, coolers, control cabinets.iv. Lightning arrestors support.
4.1.1.3 CONDITION MONITORING OF TRANSFORMER/ REACTOR & ACCESSORIES
During the storing time, the storing place, transformer/ reactors, components andaccessories are inspected regularly. Observations, readings, measures and datesshould be noted in formats standardized and enclosed with this document. In case offaults or abnormal observation, immediate rectification action shall be initiated withintimation to RHQ.
Check at even intervals and further more during rain, storm, etc. the foundationmaterial (boundary beam etc.) and the condition of the ground.
Inspect the Transformer/Reactors periodically with regard to possible external faultsand or rust damages (say 6 monthly).
Check the heater condition and illumination of control panel at 6 monthly interval.Heaters in control panel are to be switched on manually on weekly basis.
If the Transformer/Reactor is only air/ Nitrogen filled, one should check air/ Nitrogenpressure. If the Transformer/ Reactor is oil filled, one shall take oil samples after 6months. The oil is to be tested for Break Down Voltage (BDV) and moisture content.
DGA of oil to be carried out in case the transformer/ reactor is energized earlier withhigh voltage. However prior to high voltage energization all pre-commissioning checksfor Transformer/Reactor as per CC/OS guidelines to be carried out.
All pumps and fans of spare Transformer/Reactor shall be operated on Monthly basisand any discrepancy noticed shall be rectified.
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Check the condition of the dehydrating material silica gel on 3 monthly basis fortransformer and transformer oil storage tank. The colour of silica gel shall be blue. Incase the colour of 50 % of volume of silica gel found to be pink, the same should bereplaced/re-generated.
4.1.1.4 BUSHING
On receiving, the bushing shall be carefully inspected with regard to transport damageand action shall be initiated in line with the terms and conditions stipulated in thecontract document. Please note that the bushing have been routine tested with bottomend immersed in oil and same oil may be left, especially in the narrow openingbetween porcelain and metal. If leakage is suspected the bushing must thus becarefully cleaned with solvent (alcohol) several times before a new tightness check ismade. The bushing may be stored horizontally up to 6 months. For storing over 6months it is recommended to place the bushing in the vertical position with the topbushing upwards or inclined with the top end upwards and at an angle of at least 5ο ormore based on manufacturer ‘s recommendation.
For long term storage several method can be adopted to keep the bushing at least 5 ο angle with top of end upwards. As per inventory norms, there may be 3/4 bushingsupplied as spare with each type, each make Transformer / Reactor. Normally thetransport casing is having heavy sleepers at the bottom. But it is preferred to prepare aplatform of concrete base in the outdoor with inclination of minimum 5ο or moredepending on manufacturer's recommendation such that natural storage can be madewith heavy sleeper at base. However, for Oil Impregnated Paper (OIP) bushings, thegasket surface and metal parts below the flange shall be covered with polythene orvinyl sheets to avoid rusting.
When the bushing has been stored horizontally (unless manufacturer recommendedthat they have some oil system which does not allow bubbles to form when the bushing
is in horizontal condition), it shall be raised with the top up at least 12 hr. before servicevoltage is applied and 24 hr. before test voltage is applied.
Corporate OS/ Manufacturer shall be referred to provide a suitable standard design ofstoring the nos. of bushing at a particular site/Regional store.
4.1.1.5 CONDITION MONITORING
It is mandatory that bushing is to be tested as follows:
i. Visual inspection for physical damages Monthlyii. Check oil leakage 6 Monthlyiii. Check the oil level in the indicator 6 Monthly
iv. Check the tan delta of bushing 5 Yearlyv. Check the capacitance of bushing 5 Yearlyvi. Check the bushing CT for the following
a. Insulation test Yearly
All the tests are to be documented in the format enclosed.
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4.2 CIRCUIT BREAKER
Upon delivery of equipment and before any handling, make sure that the cases andpacking used for transport are in sound condition and that no case is missing.
Immediately after receipt of any spares, inspection to be carried out, and in case ofdamages or missing items, a claim should be made in line with the terms and conditionstipulated in the contract agreement
In case of breaker transported with hydraulic operating mechanism as a factory
assembly unit. It is recommended not to remove the various assembly of the hydraulic
circuit before final erection. These obstructers prevent ingress of dust or foreign bodies
in the circuit during storage period.
As per inventory Norms breaker pole along with accessories are supplied as spares.
This breaker is to be preserved so that as and when required it shall be available for
further re-erection and use. The breaker spares should be stored indoor along withtheir packing cases.
In order to achieve this it is recommended that one or two foundation as per design
may be made near the open storage area which is approachable by crane etc. The
foundation shall be identical to the main foundation as made in the yard for similar
breaker. The complete breaker pole shall be erected on the spare foundation, same in
line with tile other breakers, but this requires suitable supporting structures and
provision is to be made in the LOA for the same.
The control cubicle and marshaling kiosks may be stored inside in case it is not
possible to erect with one pole column and interrupter. The kiosks and control cubicles
will be stored in the covered storage room free of corrosive atmosphere with heating
resistors switched on.
It is recommended to store all the loose parts of the circuit breaker indoors. The
following storage precautions shall be strictly adhered to.
i. The equipment is to be stored for more than 3 months or the weather is humid,switch on the anti-condensation heaters provided in the control unit, local controlcabinet and in the auxiliary switch box. The heater should be switched ONirrespective of weather condition.
ii. The hardware should be stored essentially in polythene bags and are keptindoors
iii. All the insulators should be stacked properly and stored in a safe place to
prevent damages to petticoats. Surfaces of sealing flanges should be protected
adequately.
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iv. The rubber pans like oil seals, gaskets, washers etc. should be stored in such a
way as to avoid mechanical damages and should be smeared with suitable
powder before storing. Store them in the covered storage room away from heat
and moisture to avoid deformation.
v. All the sealing surfaces and surfaces of terminal plates etc. should be protected
from damages during handling and storage. The open ends should be properly
sealed with Teflon/ polypropylene covers/caps to prevent ingress of moisture
vi. The operating rods are wrapped in a polythene paper with silica gel bags to
protect them against moisture. As soon as the rods are received check whether
the silica gel is still effective.
Blue color -Silica gel effectivePink color -Silica gel absorbed moisture. Requires reconditioning
If the color of the silica gel is pink, unpack the operating rods carefully by cutting
open at a suitable point and replace the silica gel. Carefully re-seal the
polythene paper using tape since moisture will penetrate even through the
smallest hole.
Note: Do not open sealed tins containing hydraulic oil and filter material till the
time of usage.
vii. Tools, accessories and SF6 gas handling equipment should be stored inside
covered storage area. Care should be taken to cover them with polythene to
prevent deposit of dust and other foreign bodies. Periodic condition monitoring
of gas handling unit shall be ensured by running it for 10 to 15 minutes after aninterval of I Year. While not in use, it is preferred that the gas handing unit is
jacked (if provided) and all pressures from the tire may be maintained.
viii. The metallic joints of the pneumatic system should always be covered with
shellac paint to avoid oxidation during storage period.
ix. Control block, Contractors, Relays, Coils, and Switches etc. should be stored
with polythene covered.
x. Consumption of various items shall be on FIRST IN and FIRST OUT basis.
Each item should be identified for its self life and a label is to be marked on thestorage item regarding its delivery date and expiry date etc. These items shall
be checked for physical damages and regular intervals to make it serviceable.
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4.2.1 CONDITION MONITORING OF BREAKER
i. Visual inspection for physical damages of breaker & accessories Monthly
ii. Checking of SF6 gas pressure (positive pressure) in the poles 6 Monthly
iii. Clean & Check heater condition of MOM box 6 Monthly
iv. Insulation test Yearly
v. Tan delta & Capacitance measurement of Grading Capacitor 5 Yearly
All the tests are to be documented in format enclosed.
4.3 132 / 220 /400kV CURRENT TRANSFORMER & DCCT
The current transformer is normally transported in a strong wooden case. In order to
clearly indicate the correct position of the case during transportation, the standardsymbols are normally used and is written normally on the case. Like: This side up/Fragile / Lift here / Center of gravity.
The current transformer is dispatched in horizontal condition due to transport limitationin height. If required it can be stored for a shorter duration say 6 Months in horizontalcondition within own packing cases. After receipt of spare CT a thorough externalexamination always be made immediately to see noting is damaged / missing. Checkfor any oil leakage and inspect the paint work. Notification of the same should beinformed in line with the terms and condition stipulated in the contract document.
The CT in vertical position should be lifted only by lifting lugs on the bottom of the tankusing the sling guides provided on the top chambers. For long term storage it is
recommended that the CT shall be stored on the foundation in a vertical position. Thefoundation is to be prepared near to the open storage area and the foundation level isminimum 300 mm above the ground level or HLF which ever is higher. It is also to beensured that crane-able road is available near to the CT foundation for futurerequirement. Since the structure of CT is not a part of spare, it is recommended that asmall structural work using C-channels/I-beam may be prepared to suit the foundationbolts and CT base hole. In case it is difficult to prepare a structural work CT may beinstalled directly on the foundation. However foundation bolt casting shall be made tomatch with the base hole of the CT.
In case suspected damage to the insulator by un-intentional act or fly object, it isrecommended that wooden planks/covers shall be provided on surfaces.
Further it also to be ensured that the foundation bolts are tightened properly same inline with the CTs erected in the bay. Ensure that the terminals in the secondary sideare shorted and connected to earth. Also the primary terminal P1 and P2 are shortedand connected to earth.
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POWERGRID PRESERVATION PROCEDURE
4.3.1 CONDITION MONITORING
i. Visual inspection for physical damages Monthly
ii. Check oil leakage 6 Monthly Check the oil level in the indicator 6 Monthly
iii. Check the tan delta of bushing 5 Yearly
iv. Check the capacitance of bushing 5 Yearly
v. Check the bushing CT for the following
a. Insulation test Yearly
All the tests are to be documented in the format enclosed.
4.4 132/220/400kV CVT & DCVD (DC Voltage Divider)
Same in line with CT the CVTs/DCVD are to be stored on foundation in verticalposition in the open storage are near to Current Transformer. Also it is to be ensuredthat the Sl. Nos. for all the stacks of CVT shall be identical. Since the mountingstructure is not a part of CVT/DCVD spare, it is suggested to keep the CVT/DCVDdirectly on foundation or fabricate a small structure using I-beams and/or C-channel tomatch the foundation bolt and base of CVT. Further the HV terminal is to be shortedand grounded.
4.4.1 CONDITION MONITORING
i. Visual inspection for physical damages Monthlyii. Check oil leakage 6 Monthly
iii. Check the oil level in the indicator 6 Monthly
iv. Check the tan delta of CVT/DCVD 5 Yearly
v. Check the capacitance of bushing 5 Yearly
vi. Check the CVT/DCVD for the following
a. Insulation test Yearly
All the tests are to be documented in the format enclosed.
4.5 INSULATOR
Normally the disc insulators are dispatched from the manufacturer works to site bywooden crates. However before storing, it is to be inspected for physical damages, ifany. For long-term storage it is recommended that the crates are to be protected fromrain and white ant etc. The insulator crates are to be kept under a covered area asindicated in the Diagram -I on a raised platform near to the closed store. The raised
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
platform (min. 300 mm from the ground level or HFL which ever is higher) shall be filledup with fine sand in order to avoid weed growth and chipping of insulators. In case it isnot possible to store insulators in closed space in that case it can be stored in openspace with sand cushioning of minimum 3 inch. Further the nos. of stacks shall be
limited to 3 or 4 depending upon the space requirement and condition of the packingwood. Loose insulators may be repackaged into wooden crates and stacked properly.The each type of insulators are to be staggered and stored by providing identificationmarkings indicating make, EMS value. Monthly condition monitoring shall be carriedout by physical external damages etc.
The insulator stock in the stores is to be used first. And the fresh arrivals may be
stocked for upcoming stations.
4.6 TOWER PARTS
As per the 0&M norms complete tower shall be stored at Sub-station which are being
identified by the region. The tower members shall be stored on a raised platform (min.
300 mm from the ground level or HFL which ever is higher) and it is to ensure that no
water stagnation in and around the storage area even in the monsoon. The platform
shall be an area of approximately 1000 sq. m. However area can vary depending upon
the actual quantity of spare towers. The platform may be prepared on providing Brick /
stone pitching. All members and plates shall be marked according to tower BOQ and
all similar members of all complete spare towers shall be stacked and tied by
galvanized steel wire. For easy locating identification plates are to be provided near to
each type and design of towers.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
4.7 TOWER ACCESSORIES AND HARDWARE FITTINGS
Tower accessories and hardware fittings (AIum. parts only) are to be stored inside
covered storage area preferably in the racks and all other steel parts are to be stored
near to tower parts in open storage area. Each type of hardware and fittings are to be
staggered and stored by providing identification markings indicating make, type and
other details for quick retrieve.
4.8 MOTOR AND PUMP
If the motors and pumps are stored for a long time at the site, it is necessary that
certain precautions are to be taken to safeguard the motors and pumps. Motors /
pumps must be stored in packed condition with polythene cover and silica gel intact in a
covered storage shed to avoid ingress of moisture and dust. The motors / pumps
should be stored in places where there is no excessive vibration, as this would
otherwise damage the bearings. While handling under no circumstances the motors/
pumps should be dragged on the floor or handled as otherwise this will spoil the finely
ground feet which will ultimately disturb the alignment of the motor / pump. Spare
motors and pumps are to be used replacing the installed equipment during annual
maintenance in a cyclic fashion.
4.9 OPERATING DEVICE FOR BREAKERI ISOLATOR
A check for possible damages to the operating device shall be made during unpacking.
The device should preferably be stored indoors. The heater should always be switched
on in order to prevent condensation of moisture. In order to avoid entry of dust particles
it is to be ensured that the doors are properly closed and all holes are blocked except
breathing hole. Further the gear and other moving parts are to be lubricated as per the
manufacturer's recommendation.
4.10 CABLE, CONDUCTOR AND CABLE DRUM
The cable are either wound on reels or drums or supplied in coils packed and labeled.
The label which shall be securely attached to the reel or drums or coil shall have the
following information:
i. Name of the manufacturer
ii. Trade name, if anyiii. Nominal sectional area of the conductor of the cable
iv. Type of cable and voltage rating
v. Numbers of cores andvi. Length of the cable, contained in the coil or drum
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POWERGRID PRESERVATION PROCEDURE
It is recommended that all similar type of cut piece cables may wound on the steel cable
drum indicating the length of cables with proper identification marking of the drums for
easy finding in future. The above data also to be maintained for proper storage and
inventory purpose.
The stock lying in the stores need to be used first and the fresh arrivals to be stored for
upcoming stations. While in storage the ends of the cables be kept properly scaled to
prevent any ingress of moisture.
For long term storage it is recommended that all control and power cable drums arc to
be protected from rain, white ant etc. and both ends of the cable are sealed with cable
sealing compound. The cable drums are to be kept under a covered area as indicated
in the DIAGRAM -I on a raised platform near to the closed store with ramp entry for
easy handling. The raised platform (min. 300 mm from HFL or the ground level which
ever is higher) shall be filled up with fine sand or PCC" based on cost analysis in order
to avoid weed growth.
Conductors and earth wire shall be rolled on steel drums with proper tightening at both
ends and stored on outdoor raised platform.
4.11 CAPACITOR
Check that the capacitors have not been damaged in transit. The goods may be heavy
and bulky. Therefore ensure that a lifting device is available for unloading purpose. In
case the units are transported as individual, care must be taken to ensure that the
bushings arc properly protected and not to be used for handling purpose. Unless the
capacitor arc to be installed immediately after delivering they must not be stored in wetpackaging. Capacitors for outdoor installation should therefore be unpacked on delivery
or stored indoors. Capacitors for indoor installation must not be stored outdoors. It is
recommended that the capacitors stored inside for long term preservation purpose may
be kept in vertical position and initial capacitance measurement may be performed to
keep the base data.
4.11.1 CONDITION MONITORING
i. Visual inspection for physical damage Monthly
ii. Check oil leakage 6 Monthly
iii. Check the capacitance 5 Yearly
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POWERGRID PRESERVATION PROCEDURE
4.12 RESISTOR
The webs must be inspected for external damage and stored in the covered storage
area. The insulators (if transported in complete assembly condition) shall be checked
for crack, external damages etc. prior to storing.
4.12.1 CONDITION MONITORING
i. Visual inspection for physical damages Monthlyii. Measure resistance 5 Yearly
4.13 AIR CORE REACTOR/FILTER REACTOR
All the long term spares dispatched should be carefully examined upon arrival for transitdamage. In case transit damage is found, a claim should be filed immediately in line
with the terms and conditions stipulated in the contract agreement.
The majorities of air core reactors are designed for outdoor applications and can be
stored outdoors without further protections. If there is any doubt the environmental
condition of any substations where it is to be stored, the items should be stored indoors
and if required the manufacturer may be consulted.
4.13.1 CONDITON MONITORING
i. Visual inspection for physical damages Monthly
ii. Measure 5 Yearly
4.14 CONTROL RELAY PANEL AND PRINTED CIRCUIT BOARDS
Upon receipt of the control and relay panel it should be inspected for any physicaldamage. It is recommended that the relay is kept in its shipping carton until it isinstalled. The place where the relay is stored should be dry and free from dust andshould have normal room temperature. When a relay cubicle is stored for a longer
period of time in an unheated control room with a relatively high humility, for example ina new installation, and without being taken into service, a cubicle should be equippedwith a heater which is connected in immediately.
For long term storage of relays and its accessories that the relay may be kept in itsoriginal packing and it is to be ensure that all screws and units are securely tightened (ifprovided). Check that the relays have the correct data and it should be tested for checkmeasurement prior to storage in clean, dust free and dry place.
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POWERGRID PRESERVATION PROCEDURE
The printed circuit boards may be kept in its original packing and it is to be ensured thatall electrostatic protection covers shall be intact along with polythene. The PCBs arealso to be checked for their functional checks prior to storage.
4.15 LINE TRAP AND SURGE ARRESTOR
The line trap, coupling capacitor, surge arrestor etc. are to be stored outdoor on theraised platform. There is no need for foundation for SA to be erected vertically as SAparts are dispatched to site with nos. of stacks. Each stack shall be stored separately.However, LMUs, Balancing transformers, surge counters and monitors are to be storedindoors.
4.15.1 CONDITON MONITORING
i. Visual inspection for physical damages Monthly
ii. Insulation test for Surge Arrestor Yearly
4.16 TESTING INSTRUMENTS
All the testing instruments are to be stored in dust free atmosphere and preferably inthe air conditioned area. The calibration and checking at various testing labs are to befollowed as per guidelines issued by CC/OS.
4.17 TRANSMISSION LINE AND SUBSTATION TOOLS
The tools and plants which are used in the transmission lines and substations are to bestored properly such that as and when required it is to be used safely. Regardless ofownership, tools are subject to inspection. The use of tools considered defective upon
inspection shall be prohibited.
The following tools and plants for transmission line and substation may be stored indoors and to be inspected at an interval for its operation whenever applicable.
i. Ladder – The ladder should be maintained in good condition or removed fromservice if found unsuitable. Ladders shall not be painted, a protective coating ofclearly varnish, linseed oil or other transparent non conductive coating shall beused.
ii. Hand tools – Hand tools like metallic tape, metallic ruler or fabric tapes, portableelectric tools, pneumatic air tools, jack hammer, jacks, hydraulic tools, chains andhoists, tool bag etc are to be stored indoors and are to be inspected or their
smooth operation and wherever required lubrication has to be carried out.
iii. Personal protection equipment – Personal Protection Equipment like safetyhelmet, safety belts, goggles, safety glasses, face shields, eye protection,protective aprons, industrial protective gloves, high voltage rubber gloves,,respirators etc are to be stored indoors and inspected periodically for wear andtear etc.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
iv. POWERGRID vehicles must be kept under proper storage condition while notunder operation.
v. All lub oils, SF6 gas, Freon gas etc are to be stored in the storage shed in anisolated location in vertical position.
vi. Trailers: Trailers must be attached to vehicles with approved safety hitches andsafety chains that are in good condition. Trailer wheels should be blockedwhenever trailers are being coupled or uncoupled.
vii. Tractors, loaders, forklifts: loaders and forklifts when parked must havebuckets or forks lowered onto ground or floor.
viii. Oil filtration machines and oil storage tank should be kept on the cemented flooror hard surface and it is to be ensure that there should not have any vegetationgrowth around the machines. It is preferably be kept under covered shed (maynot be inside storage shed). The oil filtration machine shall be jacked up (ifprovided) while not in use and wheel pressures are to be maintained. All the
preventive maintenance are to be carried out as per the recommendations of themanufacturer. Further trial operation of filter machine regarding all the functionalchecks should be carried out once in 6 months.
4.17.1 CONDITION MONITORING
i. Hot line tools a. Visual Inspection for physical damages etc. Monthlyb. Insulation measurement Yearly
ii. ERS except insulator/All partsa. Visual inspection for physical damages and Monthly
general cleanness etc.
iii. Insulator of ERSa. Visual Inspection for physical damages etc. Monthlyb. Insulation measurement Yearly
iv. All parts of ERSa. Visual Inspection for physical damages & Monthly
general cleanness etc.
v. TOOLS AND PLANTS
a. Start mobile crane after checking coolant & lubrication Weekly
b. Greasing of bearings, slings etc of mobile crane Monthlyc. Washing and greasing of jeeps. Trailers and brake Vans. Monthlyd. Tension stringing equipment – Starting of Tensioner, Monthly
puller and other devices.e. Check condition of dehydrating material (silica gel) 3 Monthly
of oil storage tank.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
f. Inspection of Safety belts, electrical hand gloves, 3 Monthlyrubber mat, Artificial respirator etc.
g. Other items of tension stinging equipment Greasing and 6 MonthlyChecking for smooth operation.
h. Check operation of vacuum pump and heaters Oil filter M/C. 6 Monthly
i. Check condition of all filter papers oil filter M/c. 6 Monthly j. Check BDV & Moisture of oil in oil storage tank. 6 Monthlyk. Check working of SF6 filling and recycling equipment Yearlyl. Check healthiness of hydraulic jacks Yearlym. Check working of Dry air generator equipment Yearlyn. Insulation resistance Test of all electrical Hand Tool Yearlyo. Inspection of other items like slings, ropes, Yearly
derricks used for substation equipment.p. Greasing of Reactor Wheels Yearly
Miscellaneous Checks
i. The condition and material contains of Fire fighting appliance:
a. Water Buckets Monthlyb. Sand Buckets Monthlyc. Chemical Extinguishers Monthlyd. Hydrants Monthly
ii. De-weeding of complete storage area 6 Monthlyiii. Clean storm water drains and sumps around store area Yearlyiv. Check fencing around the storage complex Yearlyv. Attending water seepage in all building Yearlyvi. Chemical treatment against reptiles outdoor Yearlyvii. White washing of all storage building/shed 2 Yearlyviii. Painting of doors and windows 2 Yearlyix. Painting of oil handling plant/oil storage tank 5 Yearly
x. Anti termite treatment in Indoor stores/ sheds 5 Yearly
CONCLUSION :
The equipment spare parts and testing instruments etc. are to be preserved in a safestmanner and the summery of total preservation is indicated in TABLE-I.
The condition monitoring of various substation equipment and transmission line aretabulated in TABLE-II.
The detail procedure of various testing recommended in the condition monitoring shallbe a part of maintenance document, which is being prepared by CC/OS. Also part of
testing procedures already documented in Pre-commissioning procedures and formatsfor substation bay equipment.
The responsibility of carrying out of Inspection/Testing of spares shall be with Storesofficer and Maintenance Engineer and the records of all tests shall be documented asper the enclosed formats TABLE-III with this document. Further these documents shallbe checked and countersigned by SUBSTATION INCHARGE/GROUP HEAD.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
GENERAL LAYOUT
OF
STORAGE AREA
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
DIAGRAM - 1
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
TABLE
FOR
PRESERVATION PROCEDURES
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POWERGRID PRE
PRESERVATION OF SPARE PARTS AND SPECIAL TOOLS AND PLANT
Sr.No. Equipment Name Component Details Place(Indoor/Outdoor)
Location (StorageShed/Open Store)
Sp
1.0
2.0
3.0
4.0
Circuit Breakers
Isolators
CurrentTransformer
VoltageTransformer/DCVD
I. Complete Pole of circuitbreaker with pole columnand interrupter with M.B.(ifPossible)
II. Operating mechanism
III. Arcing Contacts, movingcontacts
IV. Relays, contactors,switches, coils, pushbuttons etc.
I. Isolator arms with male andfemale contacts(components).
II. Motor operating mechanism(MOM)
I. Complete CT
II. Terminal connectors
I. Complete CVT/DCVD
OUTDOOR
INDOOR
INDOOR
INDOOR
INDOOR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
OPEN STORE
STORAGE SHED
STORAGE SHED
STORAGE SHED
STORAGE SHED
STORAGE SHED
OPEN STORE
STORAGE SHED
OPEN STORE
CR
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
5.0
6.0
7.0
Surge Arrestor (LA)
Insulator
Transformer/
Reactor
II. Terminal Connectors
I. Complete LA with insulatingbase
II. Surge counter/monitorIII. Terminal Connectors
Bus post InsulatorPost insulator for IsolatorString Insulator
a) Insulation material such as
papers, bakelite, wood,cotton tapes etc,Chemicals as solvents,glues, varnishes,hardeners, Breathers,drying agents.
b) Fan, fan motors, pumpsand coolers.
c) Gas relays, oil levelindicators, thermometers,flow indicators,manometers, explosionvents, pressure relay,
valves etc.d) Terminal boxes, connection
boxes,control cabinets anddriving mechanisms.
INDOOR
OUTDOOR
INDOORINDOOR
OUTDOOROUTDOOROUTDOOR
INDOOR
INDOOR
INDOOR
INDOOR
STORE ROOM
OPEN STORE
STORE ROOMSTORAGE SHED
COVEREDCOVEREDCOVERED
STORAGE SHED
STORE ROOM
STORE ROOM
STORAGE SHED
RA
D
D
D
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
8.0
9.0
10.0
Fire Fighting/ ACSystem
PLCC
Batteries(220V/110V/50V/24
V)
e) Components of OLTCf) Transformer wheels
(transport arrangement)g) Blanking plates for all
opening including radiatorsand coolers
h) Bushing
Spares for Pumps /DieselEngine/ Motors/Valves/Filter(Fine/Course)/ NRV/Gaskets/
Compressor /Condenser
Control panel accessories.
Wave trap
Terminal connectors, CouplingDevice,
Coaxial Cable.
Spare battery cell, Terminalconnectors with bolts Nuts,
Float level indicators, Ventplugs.
INDOOROUTDOOR
OUTDOOR
OUTDOOR
INDORE
INDORE
OUTDOOR
INDOOR
INDOOR
INDOOR
STORE ROOMCOVERED
OPEN STORE
OPEN STORE
STORAGE SHED
STORE ROOM
OPEN STORE
STORAGE SHED
STORAGE SHED
STORAGE SHED
W
C
D
RA
S
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
11.0
12.0
13.0
14.0
15.0
16.0
220V/50V BatteryChargers
C&R Panels
LT switchgear
Lighting
Tertiary Equipment
Bus Bar Equipment
Set of Control Cards, Set ofrelays, Rectifier transformer,Control transformer, Seriesinductor, Set of contactors,Micro-switches, FilterCapacitors, Three phase fullwave bridge rectifier assembly.
Relays (Main relay, Aux.Relay, timers etc.). Eventloggers, disturbance recorder,printer, Distance to faultlocators, Energy meters,
Recorders (Voltage &frequency), power supplymodules, PCBs etc.
Relays, CTs and PTs,Switches/Push buttons,contactors, TPNSwitches/MCCB, LT BreakersparesAll materials for light fixturesand fittings
Surge Capacitor with
connector etc.Clamps and connectors-Al.pipe bus 4_ Dia or more,Rigid connector, Slidingconnector, Corona bell.Corona rings.
INDOOR
INDOOR
INDOOR
INDOOR
INDOOR
INDOOR
STORE ROOM
STORE ROOM
STORE ROOM
STORE ROOM
STORAGE SHED
STORAGE SHED
D
(A
D(A
D
D
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
17.0
18.0
19.0
20.0
Transmission Lines
Cable/Conductor
HVDC/SVC
Special TestingEquipment
Tower parts & Steel Hardwarepart,
Earth wire, conductor, insulatorAccessories for conductor,earth wire and hardwarefittings (Aluminium)
Cables of all sizes
All conductor, Earth wire
Thryistors, Resistors,
Capacitors, Water/PEX pipes,Light guides, Connections,Valve cooling systemequipment, control andprotection cards, Power supplymodules, Mother boards,control panel and Mimic boardspars etc.
Coupling Capacitors
Neutral Bus Switches
Relay test kilt, Breaker timingkit. Tan delta kit Primaryinjection kit, Multimeter,Megger etc.
OUTDOOR
OUTDOOR
INDOOR
OUTDOOR
OUTDOOR
INDOOR
OUTDOOR
INDOOR
INDOOR
OPEN STORAGE
COVERED SHED
STORE ROOM
COVERED SHED
OPEN STORE
STORE ROOM
OPEN STORE
OPEN STORE
STORE ROOM
P
RA
D
(AI
RA
D
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
21.0
22.0
23.0
24.0
PLC Equipment
AC/DC HarmonicFilter
Tools and Plants
Hot Line Tools
PLC filter reactor,PLC filter capacitor element.
Tuning Units
Capacitor Cans
Resistor elementsReactorArrestorNeutral Bus Surge Arrestor.
Truck mounted craneHydraulic
Transformer oil tank 5-15 KLDry air generatorIPS Bending machineHydraulic conductor cuttersEqualizer pulley, Swivel jointfor conductor
Wireless sets
Welding m/c with its own
Diesel engine
All tools
OUTDOORINDOOR
INDOOR
INDOOR
INDOOROUTDOOROUTDOOROUTDOOR
OUTDOOR
OUTDOORINDOORINDOORINDOORINDOOR
INDOOR
OUTDOOR
INDOOR
OPEN STORESTORAGE SHED
STORAGE SHED
STORAGE SHED
RACKSOPEN STOREOPEN STOREOPEN STORE
STORE ROOM
COVEREDSTORAGE SHEDSTORAGE SHEDSTORAGE SHEDSTORAGE SHED
STORE ROOM
COVERED
STORE ROOM
RA
RARARA
D
D
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POWERGRID PRE
Sr.No. Equipment Name Component DetailsPlace
(Indoor/Outdoor)Location (StorageShed/Open Store)
Sp
25.0
26.0
27.0
EmergencyRestoration System
Tension StringingMachines/Tools forLines
Miscellaneous
Columns/Boxes
Other T&P/ Accessories/Insulator
Puller/Tension motorizedwinches etc.
Other T&P
Lub oil. Freon, SF6, Petrol &Diesel, Chemical etc.
OUTDOOR
OUTDOOR
OUTDOOR
INDOOR
INDOOR
OPEN STORE
OPEN STORE
COVERED OPENSHED
STORE ROOM
STORAGE SHED
INRA
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
TABLEFOR
CONDITION MONITORING CHECKS
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POWERGRID PRE
CONDITION MONITORING FOR SPARES OF TRANSMISSION SYSTEM EQUIPMENT AND SPECIA
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
1.
2.
Circuit Breakers
Current Transformer
a) Visual Inspection for physicaldamages etc. of breaker andaccessories.
b) Tan delta & Capacitancemeasurement of Grading capacitor
c) Insulation testd) Maintain the SF6 gas pressure of
approx.0.3 bar.
e) Clean & Check Heater for ControlBox.
a) Visual Inspection for physicaldamages etc.
b) Check oil leakage
c) Check the oil level in the indicator.
d) Check the tan delta of CT
e) Check the capacitance of CT
f) Check the CT for the following.Insulation Test
Monthly
5 Yearly
Yearly6 Monthly
6 Monthly
Monthly
6 Monthly
6 Monthly
5 Yearly
5 Yearly
Yearly
Repair/replace wherevedamage of glazing apply
Tan delta <0.007 at 20°For capacitance check t1000 Mohm with 5kV meFill up if required.
With blower & vacuum c
Repair/replace wherevedamage of glazing apply
Rectify if leakage is obs
In case level is lower, lo
Tan delta<0.007 at 20°C
Check the factory test v
1000Mohm with 5kV me
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
3.
4.
5.
6.
7.
VoltageTransformer/DCVD
Isolators
Surge Arrestor(LA)
Insulator for line &S/S
Transformers/ Reactors
a) Visual Inspection for physicaldamages etc.
b) Check oil leakagec) Check the oil level in the indicatord) Check the tan delta of CVTe) Check the capacitance of CVTf) Check the CVT for the following
i) Insulation Test
a) Visual Inspection for physicaldamages
b) Greasing of Male and Femalecontacts
c) Clean & Check heater condition ofMOM box.
a) Visual Inspection for physicaldamages
b) Insulation test
Visual Inspection for physical damages
a) One complete set of blanking plateswith marking are to be inspected forrust, corrosion etc.
Monthly
6 Monthly6 Monthly5 Yearly5 Yearly
Yearly
Monthly
Yearly
6 Monthly
Monthly
Yearly
Monthly
6 Monthly
Repair/replace wherevedamage of glazing applyRectify if leakage is obs
In case level is lower, lo
Tan delta<0.007 at 20°C
Check the factory test v
Min.1000Mohm with 5kV
megger,min.1MΩfor sec
Repair/replace whereve
Remove rust wherever
With blower & Vacuum
Rectify / Repair/replace of slight damage of glaz
Min.400 Mohm with 5kV
Repair/Replace wherevedamages of glazing app
Remove rust.
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
7.
8.
BUSHING
Rotating/Movingparts of equipment
b) Check the condition of dehydratingmaterial (Silica gel) of
c) Operate the pumps and cooler
d) DGA and other oil tests (BDV &moisture) of Transformer/Reactor(DGA only if it is energized).
e) Pre-commissioning checks as perOS guidelines
f) Illumination and space heater ofControl box.
a) Visual Inspection for physicaldamages
b) Check oil leakagec) Check the oil level in the indicatord) Check the tan delta of bushinge) Check the capacitance of bushingf) Check the bushing CT for the
followingi) Insulation Test
All Bearings, Gears, Sleeves, shaftsetc. Greased.
3 Monthly
Monthly
6 Monthly
ONCE
6 Monthly
Monthly
6 Monthly6 Monthly5 Yearly5 Yearly
Yearly
6 Monthly
Regenerate if colour chaquantity.
Investigate any discrepa
Investigate if BDV<50kVthe leakage, breather, S
Check the results with fa
Investigate any discrepa
Repair/replace wherevedamage of glazing applyRectify if leakage is obsIn case level is lower, lo
Tan delta<0.007 at 20°CCheck the factory test v
Min.1000mohm with 5kV
Remove rust before fres
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
9.
10.
11.
12.
13.
Batteries(220V/50V)
Cable
AC/DC filterFilter Capacitor
Air core
Reactor/FilterReactor
Filter Resistor
Hot line tool
ERS exceptinsulator/AI parts
Insulator
a) Visual Inspection for physicaldamages etc.
a) Insulation test betweenCore - CoreCore - Armour
a) Visual Inspection for physicaldamages
b) Check oil leakagec) Check the capacitance Value.
a) Visual Inspection for physical
damagesb) Check Reactor Inductance
a) Visual Inspection for physicaldamages
b) Measure resistance
a) Visual Inspection for physicaldamages
b) Insulation measurement
a) Visual Inspection for physicaldamages and general cleanness etc.
a) Visual Inspection for physicaldamages
b) Insulation measurement
6 Monthly
3 Yearly3 Yearly
Monthly
6 Monthly5 Yearly
Monthly
5 Yearly
Monthly
5 Yearly
Monthly
Yearly
Monthly
Monthly
Yearly
Remove rust before fres
Min.1 Mohm with 500V Min. 1 Mohm with 500V
Repair/replace whereve
Rectify if leakage is obsCheck the factory test v
Repair wherever applica
Check the factory test v
Repair wherever applica
Check the factory test v
Repair wherever applica
Min.400MΩ with 5kV me
Repair wherever applica
Repair wherever applica
Min.400 MΩ with 5kV m
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
14.
15.
16.
All parts
Wave Trap
CR panel Relays
TOOLS ANDPLANTS
a) Visual Inspection for physicaldamages and general cleanness etc.
a) Visual Inspection for physicaldamages
b) Insulation measurement of LA
Sectional checks for all spare relays.
Check working of SF6 filling andrecycling equipment.
Check healthiness of hydraulic jacks
Check working of Dry air generatorequipment.
Insulation resistance Test of allelectrical Hand Tool.
Start mobile crane after checkingcoolant and lubrication.
Greesing of bearings, slings etc. ofmobile crane
Inspection of safety belts, electricalhand gloves, rubber mat, artificialrespirator etc.Washing and greasing of Jeeps,Trailers and brake Vans
Monthly
Monthly
Yearly
Once
Yearly
Yearly
Yearly
Yearly
Monthly
Monthly
Yearly
Monthly
Repair wherever applica
Repair wherever applica
Min.1 Mohm with 500V
Investigate any discrepa
Rectify any discrepancy
With special regard to o
Rectify wherever require
Minimum 1 Mohm with 5
Check operation of all d
Remove rust wherever
Replace defective once
Run these vehicles mini
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
16 Miscellaneous
Tension stringing equipment-Starting ofTensioner, puller and other devices
Other items of tension stringingequipment Greasing and checking forsmooth operationInspection of other items like slings,ropes, derricks used for substationequipmentCheck operation of vacuum pump andheaters Oil filter m/cCheck condition of all filter papers Oilfilter m/c
Check BDV and moisture of oil in oilstorage tank
Check condition of dehydratingmaterial(silica gel) of oil storage tank
Check the condition and materialcontains of Fire fighting appliance
I) Water BucketsII) Sand BucketsIII) Chemical Extinguishers
IV) Hydrants
Deweeding of complete storage area
Clean storm water drains and sumpsaround store area
Monthly
6 Monthly
Yearly
6 Monthly
6 Monthly
6 Monthly
3 Monthly
Monthly
Quarterly
1 year (Before Mansoon)
Check operation of all d
Remove rust wherever
Replace defective once
Rectify wherever require
Rectify wherever require
Investigate if oil BDV < 5
Regenerate if colour chaquantity
Check and refill if requirValve for use.
Use chemical wherever
Use anti algae compoun
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POWERGRID PRE
SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY
REMARKS
17.0 Testing Instrument
Check fencing around the storagecomplex
White washing of all storagebuilding/shed
Attending water seepage in all building
Painting of doors and windows
Chemical treatment against reptiles
Calibration and functional checks
Yearly
3 yearly
Yearly
2 Yearly
Yearly
As OSguidelines
Repair wherever applica
After rectifying defects i
Look for water stagnatio
Repair defects, if any
With special regard to s
Ref the document “ Stanreleased by CC/OS
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
FORMAT
FOR
MONTHLY CHECK LISTS
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
TABLE – III
MONTHLY CHECK LIST FORMAT FOR SPARES AND SPECIAL T&P
REGION : DATE OF LAST INSPECTION :
SUB STATION : DATE OF INSPECTION :
01. Visual Inspection for physical damages etc.
(Repair / Rectify wherever required)
EQUIPMENTNAME
TYPEVOLTAGECLASS
MAKE QTY OBSERVTION
Circuit Breakers
01
02
03
04
Isolators
01
02
03
CurrentTransformer
01
02
03
04
VoltageTransformer/
01
02
03
04
Surge Arrestor(LA)
01
02
03
04
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
EQUIPMENT NAME TYPEVOLTAGECLASS
MAKE QTY OBSERVTION
Insulator for line & S/S
01
02
03
04
05
Bushing
01
02
03Filter Capacitor
01
02
03
Filter Reactor
01
02
03
Filter Resistor
01
02
03
Hot line tool
Air Core Reactor
01
02
03
ERS includinginsulator/Al partsnsulator
Wave Trap
01
02
03
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
02: TRANSFORMER/REACTOR :
Operate the pump and cooler and investigate any discrepancy
EQUIPMENT NAME TYPE VOLTAGE CLASS MAKE QTY OBSERVTION
Pump
01
02
03
04
Cooler
01
02
03
04
03 : TOOLS AND PLANTS :
EQUIPMENT DETAILS/CHECK LIST REMARKS OBSERVATION
Tension stringing equipment-Startingof Tensioner, puller and other devices
Check operation of all devices
Start mobile crane after checkingcoollant and lubrication
Check operation of all devices
Greasing of bearings, slings etc. ofmobile crane
Remove rust whereverapplicable
Washing and greasing of Jeeps,Trailers and brake Vans
Run these vehicles minimum 0KM per week.
04. CHECK FOR THE COLOUR OF DEHYDRATING MATERIAL (Silica gel)
Regenerate if colour change is more than 50% of total quantity
EQUIPMENT MAKE & TYPE OBSERVATION REMARKS
01 Transformer
02 Oil Storage tank03
Note : The responsibility of carrying out of Inspection/Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group head/Station-in-charge.
Signature: Signature :Name : Name :Group head /Station-in-charge
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
FORMAT
FOR
SIX MONTHLY CHECK LISTS
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
6 MONTHLY CHECK LIST FORMAT FOR SPARES AND SPECIAL T&P
REGION : DATE OF LAST INSPECTION :
SUB STATION : DATE OF INSPECTION :
01: Visual inspection for Oil Leakage, Oil level in the indicator
EQUIPMENT NAME TYPEVOLTAGE
CLASSMAKE QTY OBSERVTION
Current Transformer
01
02
03
04Voltage Transformer
01
02
03
04
Bushing
01
02
03
Capacitor (Only oilleakage)
01
02
03
Oil storage Tank XX
Oil drums* XX
* Remove leaking drums from the storage area.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
02:I) Inspection of GAS pressure in SF6 Circuit BreakerII) Check for heater condition in Control boxes, Marshalling Boxes, Operating mech. Boxes etc.
Measure gas pressure 0.3 bar, if leakage observed, rectify
EQUIPMENT NAME TYPEVOLTAGECLASS
MAKE QTY OBSERVTION
Circuit Breaker
01
02
03
04
Isolator (Heater Condition)
01
02
03
Transformer Control Panel
03: Transformer / Reactor:
Equipment Details/Check List
Remarks Observation
a) One complete set of blanking plateswith marking are to be inspected forrust, corrosion etc.
Remove rust
b) Check the condition of dehydratingmaterial (Silica gel) of Transformer/ Reactor .(3 Monthly)
Regenerate if colour change ismore than 50% of total quantity
c) DGA and other oil tests ofTransformer/ Reactor
Investigate if BDV < 50 KV &moisture > 25 PPM of Oil, check forleakage, breather, Silica gel etc.
04: Physical inspection of Spare battery cells.
EQUIPMENT NAME TYPE AMPHR. MAKE QTY OBSERVTION
Battery(245V/50V /110V/220V
01
02
03
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
05: ROTATING MACHINES
Equipment Details/
Check ListRemarks Observation
a) Greasing of male & femalecontacts of isolator
Remove rust, if noticed.
b) Bearings, gears, shafts,sleeves etc. including MOMbox gears.
Remove rust before applicationof fresh grease.
c) Other items of tensionstinging equipment Greasingand checking for smoothoperation
Remove rust whereverapplicable.
d) Check operation of vacuumpump and heaters Oil filterm/c
Rectify wherever required
e) Check condition of all filterpapers Oil filter m/c
Rectify wherever required
f) Check BDV of oil in oilstorage tank
Investigate if BDV < 50 KV &moisture > 25 PPM of Oil,check for leakage, breather,Silica gel etc.
Deweeding of complete storagearea
Use chemical whereverpossible
Check the condition andmaterial contains of Fire fightingappliance
I) Water Buckets
II) Sand BucketsIII) Chemical
ExtinguishersIV) Hydrants
Check and refill if required andcheck the condition of Valve foruse
Note: The responsibility of carrying out of Inspection/ Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group Head/ Station –in-charge.
Signature: Signature:Name: Name:
Group Head/Station-in-charge.
,
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
FORMAT
FOR
YEARLY CHECK LISTS
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
YEARLY CHECK UP LIST FORMAT FOR SPARES AND SPECIAL T&P
REGION : DATE OF LAST INSPECTION :
SUB STATION : DATE OF INSPECTION :
01: Insulation measurement of following spare equipment
EQUIPMENT NAME TYPEVOLTAGE
CLASSMAKE QTY OBSERVTION & REMARKS
Circuit Breaker Min. 1000 MΩ with 5kV megger
01
02
03
Current Transformer Min. 1000 MΩ with 5kV megger
01
02
03
04
Voltage TransformerMin. 1000 MΩ with 5kV megger
& 1 MΩ with 500 v megger forsecondary
01
02
03
04
BUSHING CT Min. 1000 MΩ with 5kV megger
01
02
03
Surge Arrester Min. 400 MΩ with 5kV megger
01
02
Hot line tool Min. 400 MΩ with 5kV megger
ERS insulatorMin. 400 MΩ with 500kVmegger
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
EQUIPMENT NAME TYPEVOLTAGE
CLASSMAKE QTY OBSERVTION & REMARKS
Cable Min. 1 MΩ with 500kV megger
Wave Trap LA Min. 1 MΩ with 500kV megger
Insulation resistanceTest of all electricalHand Tool
Min. 1 MΩ with 500kV megger
02: Tools & Plants
Equipment Details/
Check List Remarks Observation
Check working of SF6 filling and recyclingequipment
Rectify any discrepancy
Check healthiness of hydraulic jacksWith special regard to oil andbucket washer
Check working of Dry air generatorequipment
Rectify wherever required
Insulation resistance Test of all electricalHand Tool
Minimum 1 Mohm with 500 Voltmegger
Inspection of safety belts, electrical handgloves, rubber mat, artificial respirator etc.
Replace defective once
Inspection of other items like slings, ropes,derricks used for substation equipment
Replace defective once
Clean storm water drains and sumpsaround store area
Use anti algae compound
Check fencing around the storagecomplex
Repair wherever applicable
Attending water seepage in all building Look for water stagnation / holesetc.
Chemical treatment against reptiles With special regard to snakes(wherever applicable)
Note: The responsibility of carrying out of Inspection/ Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group Head/ Station –in-charge.
Signature: Signature:Name: Name:
Group Head/Station-in-charge.
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
5 YEARLY CHECK UP LIST FORMAT FOR SPARES AND SPECIAL T&P
REGION : DATE OF LAST INSPECTION :
SUB STATION : DATE OF INSPECTION :
01: Tan δδδδ and Capacitance measurement of following spare equipment
EQUIPMENTNAME
TYPEVOLTAGE
CLASSMAKE QTY OBSERVTION & REMARKS
Circuit BreakerGrading capacitor
Tan δ < 0.007 & checkcapacitance as per factoryTest result
0102
0304CurrentTransformer/
Tan δ < 0.007 & checkcapacitance as per factoryTest result
01020304
VoltageTransformer/ DCVC
Tan δ < 0.007 & checkcapacitance as per factoryTest result(+ 5%)
01020304
BUSHING Tan δ < 0.007 & checkcapacitance as per factoryTest result
010203
FILTER
CAPACITOR (onlyCapacitance)
Check capacitance as per
factory test results
010203
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DOC No : D-1-10-XX-01-02
POWERGRID PRESERVATION PROCEDURE
02: INDUCTANCE MEASUREMENT
EQUIPMENTNAME
TYPE VOLTAGECLASS
MAKE QTY OBSERVTION
FILTER
REACTOR
Check as per factory Test
results
010203
AIR COREREACTOR
Check as per factory Testresults
0102
03: RESISTANCE MEASUREMENT
EQUIPMENTNAME
TYPEVOLTAGE
CLASSMAKE QTY OBSERVTION
FILTERRESISTOR
Check as per factory Testresults
010203
Note: The responsibility of carrying out of Inspection/ Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group Head/ Station –in-charge.
Signature: Signature:Name: Name:
Group Head/Station-in-charge.