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AA SPEC 538011 MEDIUM VOLTAGE INDUCTION MOTORS SPECIFICATION
VERSION 1
14 JANUARY 2013
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MEDIUM VOLTAGE INDUCTION MOTORS
1 Scope 3
2 Technical Requirements to be Specified by the Engineer 3
3 Definitions & Abbreviations 3
4 Requirements 4
4.1 Safety 4
4.2 Design 4
4.3 Material Properties 20
4.4 Mechanical Properties 20
4.5 Electrical Properties 21
4.6 Corrosion Protection 21
5 Quality Assurance Provisions 21
6 Test and Inspection Methods 21
6.1 Chemical Tests 21
6.2 Mechanical Tests 21
6.3 Electrical Tests 21
6.4 NDE 23
7 Marking and Packing 23
7.1 Marking 23
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7.2 Packing 23
Appendix A: Referenced documents 24
Appendix B: Record of Amendments 25
Appendix C: Data Sheet To Be Completed By The Engineer And The
Contractor For Each Motor Type 26
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1 SCOPE
This specification details the requirements for fixed speed,
three-phase, alternating-current, air or water cooled squirrel cage
and wound rotor (slip ring) induction motors for voltages from 3
300 to 13 800 V between lines and at a frequency of 50 Hz or 60
Hz.
This specification does not cover synchronous motors or special
motors for variable speed drives.
2 TECHNICAL REQUIREMENTS TO BE SPECIFIED BY THE ENGINEER
The following information shall be specified in all tenders,
contracts or orders:
a) Title, reference number and issue number of this
specification.
b) The completed data sheet. (Contractors supplying motors to
this specification are to ensure that they receive completed data
sheets indicating the Engineers requirements)
3 DEFINITIONS & ABBREVIATIONS
For the purposes of this specification the following definitions
shall apply:
ETD : Embedded Temperature Detector
ECP : End Corona Protection:
The final layer applied to the stator coil in the vicinity of
the slot exits which is designed to make electrical contact with
the OCP and has a voltage dependent resistivity so that electrical
stress concentration on the surface of the coil is relieved to
prevent potentially dangerous partial discharge in service. The
length of the ECP is dependent on the voltage, altitude and/or the
contractor's design standards. Sometimes referred to as stress
grading
IEC : International Electrotechnical Commission
NEMA : National Electrical Manufacturers Association
OCP : Slot Corona Protection / Corona Shield:
The conductive final layer which constitutes the surface of the
stator coil in the slot portion and extending approximately to the
end of the press fingers, which is designed to make electrical
contact with the core at regular positions along the slot and which
has a resistivity that is:
a. Independent of voltage stress,
b. Low enough that the surface of the coil is maintained at a
voltage sufficiently close to earth potential so as to prevent
potentially dangerous partial discharge at the same location will
occur between the coil surface and core,
b) High enough that it will not result in increased core losses
due to short circuiting of the core lamination plates.
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PD : Partial discharge
Un : Rated line-to-line voltage
Ueff : Effective line-to-line nominal voltage, at sea level, of
the rated line-to-line voltage at design altitude.
VPI : Vacuum Pressure Impregnation
The following terms are defined in the General Conditions of
Contract:
a) Anglo American, Approved, Company, Contractor, Engineer
4 REQUIREMENTS
4.1 Safety
All equipment and services shall comply with the requirements of
the relevant national safety laws and regulations (for example, in
South Africa this is the Occupational Health and Safety Act and the
Mines and Works Act), Anglo American Fatal Risk Standards, the Mine
Engineering Codes of Practice and the Mine Standard Procedures.
4.2 Design
4.2.1 General
Unless otherwise specified in this document, motors manufactured
to this specification shall comply with the requirements of the
latest issues of all applicable parts of all parts of the standards
listed in Appendix A.
4.2.2 Duty and Rating
Motor shall be manufactured for continuous running duty type S1
with a rating class for continuous duty, unless otherwise specified
in the data sheet. The rated output of the motors shall be given in
the data sheet.
4.2.3 Site operating conditions
The site operating conditions are specified in Appendix C
4.2.4 Electrical operating conditions
The electrical operating conditions are specified in Appendix
C
The motors shall be suitable for operation and starting on a
three-phase voltage supply system having a harmonic voltage factor
(HVF) not exceeding 0,03 as for design N motors as defined in IEC
60034-12 Rotating electrical machines Part 12: Starting performance
of single-speed three-phase cage induction motors
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4.2.5 Electrical Grounding
The stator windings shall have the same insulation to ground at
both line and neutral ends.
The motors are to be suitable for use on effectively earthed
systems. The system will be either solidly earthed or limited by a
neutral grounding compensator resistor or resistor only, as
specified in Appendix C.
4.2.6 Thermal Performance
As specified in the data sheet, the motor shall have either a
limited temperature rise or a service factor as follows:
a) Temperature Rise
The temperature rise shall not exceed Class B minus 10 C
measured by winding resistance when tested at nominal conditions in
accordance with IEC 60034-2-1 Rotating electrical machines Part
2-1: Standard methods for determining losses and efficiency from
tests (excluding machines for traction vehicles) and IEC 60034-2-2
Rotating electrical machines Part 2-2: Specific methods for
determining separate losses of large machines from tests -
Supplement to IEC 60034-2-1 and corrected for the site altitude
above sea level (as specified in the data sheet).
b) Service Factor
The motor shall have a service factor of 1,15 and the insulation
temperature rise shall be as stipulated in NEMA MG1 Motors and
Generators for class B when tested at nominal conditions, corrected
for site altitude (as specified in the data sheet).
The Contractor shall record in the data sheet the maximum
temperature rise when operating at any point in Zone A or Zone B as
defined in IEC 60034-1 Rotating electrical machines. Part 1: Rating
and performance.
4.2.7 Efficiency
High efficiency motors are preferred. The adjudication shall be
based on a capitalisation of losses according to the following
formula:
Where
) ) )
)
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Where
Symbol Units Definition
PNL kW Guaranteed no load losses hNL hours No of hours per year
that the motor will be operated at no load
CE $/kWh Cost of energy per hour
CMD $/kWh/month
Cost of maximum demand per month
PL kW Guaranteed losses at the duty point load hL hours No of
hours per year that the motor will be operated at the duty
point load
i per unit Interest rate
n - Number of years over which losses will be capitalised
Where energy is charged at different rates at different periods
(for example, summer and winter), the losses will be calculated
accordingly.
Where bidirectional motors, which are preferred, have a
significant reduction in efficiency compared to a unidirectional
option, the Contractor shall indicate both efficiencies in the data
sheet.
4.2.8 Driven Load
Full details of the driven load shall be given in the data
sheet.
The Contractor when requested shall liaise with the supplier of
the driven equipment to ensure that the motor is suitable for the
duty.
Any special requirements that the Contractor may have found
necessary for the particular drive from previous experience shall
be brought to the attention of the Engineer.
4.2.9 Vibration
4.2.9.1 IEC Standards
Where the engineer selects, in Appendix C, vibration to be to
IEC standards, the unfiltered vibration limit for 2 pole machines
shall be 1.8 mm / second rms when mounted rigidly in the
contractors works according to IEC 60034-14 Rotating electrical
machines Part 14: Mechanical vibration of certain machines with
shaft heights 56 mm and higher - Measurement, evaluation and limits
of vibration severity. For machines of 4 pole and higher, the
vibration limits shall be to grade B in IEC 60034-14.
4.2.9.2 NEMA Standards
Where the engineer selects, in Appendix C, vibration to be to
NEMA standards, the unfiltered vibration limit for 2 pole machines
shall be Limit 0,15 as for Standard Industrial motors. For machines
of 4 pole and higher, the unfiltered vibration limit shall Limit
0,08 as for Medium Large motors with Special Requirements.
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4.2.10 Starting Design
The motors shall be capable of starting and accelerating the
driven load specified in the data sheet at 80% of the rated supply
voltage at the terminals of the motor.
The direct on line starting current at nominal voltage shall not
exceed six times the motor rated full load current on cage motors
and the motors shall be suitable for direct on line starting
whether reduced voltage starting is used or not.
The run up time of the motor and load when operating at 100% and
80% of rated supply voltage shall be stated by the Contractor in
the data sheet.
The number of successive starts (coasting to rest between
starts) from cold and hot shall be specified in the data sheet but
shall not be less than three successive starts from cold (i.e. the
motor at ambient temperature) and two successive starts from hot
(i.e. the motor at normal operating temperature).
The contractor shall stipulate the cooling period before another
start attempt is permitted. The maximum stator and rotor
temperature rises that would occur during this starting duty cycle
shall be calculated by the Contractor and stated in the data
sheet.
The contractor shall stipulate the time duration that the motor
can remain stalled with full voltage applied, with the motor hot
and cold before the stall condition, without it resulting in damage
to the motor rotor or stator.
The Contractor shall also state the maximum number of starts
expected for the life of the machine.
4.2.11 Data to be specified and guaranteed by the Contractor
The Contractor shall complete the data sheet (Appendix C) and
the certificate of compliance (Appendix D).
The data quoted by the contractor in Appendix C for power
factor, temperature rise, no - load losses and losses at the duty
point load shall be guaranteed.
4.2.12 Critical speed
The motor critical speed must be well clear of the motor
operating speed and preferably greater than 20% above the normal
operating speed. Where this is not possible a critical speed less
than 70% of normal operating speed will be permitted. The
Contractor shall state the motor calculated critical speed in the
data sheet.
4.2.13 Active material
The dimensions of the rotor active core material, without air
ducts etc, are to be given by the Contractor in the data sheet in
the form of D, L, D2L and ratio L/D, where D is the rotor diameter
in metres and L the active core length in metres. Motors having a
larger diameter D and shorter length L are preferred.
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4.2.14 Enclosures
All parts of the motors shall be to gauge and be interchangeable
between like machines.
The motor enclosure protection and cooling form shall be as
specified in the data sheet.
If there are any restrictions on dimensions for transport
underground, mounting on plant or for interchangeability with
existing motors, the details shall be given in the data sheet.
If a motor is required to be interchangeable with existing
motors it is to be totally interchangeable, physically,
mechanically and electrically so that no modifications to cable
terminations, water or oil circuits are required when the motors
are interchanged.
4.2.15 Cooling
The air or water cooling systems and the heat exchanger design
shall be approved by the Engineer.
If a separate electrically driven cooling fan is used for the
secondary circuit on a CACA system (IC5A1A6 or IC6A1A6), the system
shall be approved by the Engineer. The energy consumption of the
external fans shall be included in the total losses for efficiency
figure.
Where heat exchanger tubes are provided, such as in "CACA"
machines, provision shall be made for easy cleaning of such tubes.
Construction detail of fan cowlings, ducting and the related
components shall be such that access to both ends of the respective
cooling tubes is possible, for inspection and cleaning
purposes.
Water coolers shall be designed for counter current flow and all
material in contact with the water shall be stainless steel type
304 or other material approved by the Engineer. The Engineer shall
provide a detailed water analysis to enable the motor manufacturer
to select the correct materials. The flow rates and pressure
withstand capability of the water cooler shall be given by the
Contractor in the data sheet. Where a common water cooling system
is used for the driven load (for example a compressor) and the
motor, the motor Contractor shall liaise with the Contractor of the
driven load to ensure a compatible cooling water system. Water
coolers shall have means of detecting water leaks and protecting
the windings from any leaks that may occur.
Water cooling systems shall be tested at not less than 1.5 times
the maximum operating pressure of the system.
The coolers shall be so arranged as to permit their easy removal
as a unit from the motor with the minimum of disturbance to the
cooling water pipe work. Suitable drainage pipes shall be provided
to permit emptying of the coolers prior to their removal.
Cooling water quality shall be as defined by the project
specification.
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4.2.16 Shaft
The shaft shall be adequately sized for the duty and be designed
and manufactured in accordance with the requirements of Anglo
American specification AA 538032 Shafts for electric AC induction
machines with frame sizes 355 and larger.
Unused shaft extensions shall be enclosed in detachable, robust
metal covers.
4.2.17 Coupling
The supply, machining and fitting of the coupling shall be as
given in the data sheet. Where a coupling is supplied or fitted by
the Contractor it shall be separately balanced and then fitted to
the motor.
4.2.18 Shaft mounted cooling air fans
The motor and the shaft mounted cooling air fans shall be
suitable for bi-directional rotation. In the event that this
reduces the efficiency of the motor by more than 0.25% or requires
extra silencers to achieve the noise level limits, the Contractor
shall offer as an alternative unidirectional motors and fans.
In the case of unidirectional motors the bearings shall be
suitable for bi-directional rotation so that by changing the fans
the direction of rotation may be altered.
4.2.19 Air gap
The stator and rotor shall be designed, manufactured and
assembled so as to produce a uniform air gap. The air gap shall be
as large as possible consistent with achieving a satisfactory power
factor. The minimum air gap acceptable to the Engineer will vary
from motor to motor, but shall be considered in relationship to the
machine size and speed, enclosure material, viz. mild steel or cast
iron, and the type of bearings.
The motor shall have facilities to measure the airgap at three
points 120 degrees apart on each end of the motor.
4.2.20 Bearings
The Engineer's preferred bearing arrangement viz. either grease
lubricated ball and roller bearings, oil lubricated end shield
mounted sleeve bearings or oil lubricated pedestal mounted sleeve
bearings shall be indicated in the data sheet. Any alternative
bearings systems proposed by the Contractor will need to be
approved by the Engineer.
No axial thrust from the driven load shall be transmitted to the
motor bearings but the motor bearings shall be suitable for
absorbing the thrust of the motor rotor floating uncoupled.
Both the drive end and non-drive end bearings shall be
insulated. The drive end bearing shall be fitted with an earth
strap, which can be easily removed for testing, to connect the
insulated bearing to the frame. On all 2 pole motors from 500 kW
and above and on all lower speed machines from 1 000 kW and above,
the drive end shaft shall be grounded to the motor frame by a
ground brush.
The Contractor shall indicate the maximum allowable bearing
temperature in the data sheet.
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4.2.20.1 Oil lubricated sleeve bearings
Where the engineer specifies antifriction bearings, these shall
comply with this section.
The bearing assembly shall comprise a spherically seated
horizontally split sleeve bearing, an oil reservoir and oil rings
to transfer the oil from the reservoir to the top of the
journal.
The reservoir shall be adequately sized to enable the bearing to
be naturally air-cooled and to maintain the bearing temperature
within the permissible temperature of the bearing with an ambient
air temperature of 40 C.
The white metal shells shall be doweled for proper location of
top half to bottom half and the top half shall be located by a pin
in the top casing.
The white metal bearing shells shall be suitable for
reconditioning in accordance with Anglo American Specification AA
232001 Reconditioning of white metal bearings
The bearings shall be either end shield mounted or have pedestal
bearings as selected by the Engineer in the data sheet.
The bearing assembly shall be for a naturally air cooled system
but it shall be supplied complete with all the pipe fittings (with
insulation) etc. necessary to add on site at a later stage if it is
found necessary a regulated circulating oil system without
replacing or altering the bearing unit.
The bearing oils shall be in accordance with Anglo American
Specification AA 166000 Lubricants general requirements.
The oil reservoir shall be fitted with a sight glass on which
the bearing oil level for both the motor stationary and the motor
running is indicated.
The regulated circulating oil system shall feed oil to the
bearing and have an oil outlet arranged so as to keep the oil in
the bearing at the correct level.
The design shall be such that the forced lubrication shall be
able to operate with the oil rings remaining and should a failure
of the oil ring occur whilst the circulating oil system is used;
the bearing will be satisfactorily lubricated without requiring the
oil flow to be increased.
If the allowable temperature rise of the bearing cannot be
achieved with a naturally air cooled system then a circulating oil
lubrication system incorporating an external water or air heat
exchanger shall be provided. Alternatively, a water jacket cooled
bearing system shall be used. The system offered shall maintain the
temperature of the white metal below 40 C. The system shall be
approved by the Engineer.
The bearing shall be fitted with an inspection aperture through
which the oil ring and forced lubrication oil feed may be observed
whilst the motor is running.
Attention shall be paid to sealing the bearing from oil leaks
and preventing oil mist and vapour from being drawn into the
windings by the ventilation system.
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The bearings shall be fitted with spring loaded 100 ohm platinum
resistance temperature detectors (RTDs). These shall be fitted into
holes drilled into the bearing shells so that the tip of the probe
is as close to the load line and to the white metal as is
practicable.
Both drive end and non-drive end bearings shall be insulated and
the type of insulation material and the method of insulating the
bearing shall be approved. The drive end bearing shall be fitted
with an earth strap, which can be easily removed for testing,
connecting the insulated bearing to the frame.
Where the motor has oil lubricated sleeve bearings the motor
shaft shall be marked on the shaft extension end with a mark and an
indicator shall be fitted to the bearing housing to indicate the
correct neutral axis running position of the rotor. The neutral
axis shall be in the centre of the end float between the bearing
thrust shoulders of the bearings.
In the case of unidirectional motors the bearings shall be
suitable for bi-directional rotation so that by changing the fans
the direction of rotation may be altered.
4.2.20.2 Grease lubricated anti-friction bearings
Where the engineer specifies antifriction bearings, these shall
comply with this section.
Bearings shall be grease lubricated anti-friction ball or roller
type bearings having C3 internal clearance designation and a brass
cage. Polyamide cages shall not be permitted.
Only approved Manufacturers of bearings, as required by the
Contract or Order shall be used.
Grease relief systems, which allow the bearing to be greased
through grease nipples whilst the motor is running or stationary
and in which the excess old grease is automatically expelled to the
outside of the motor when the motor is running, shall be
provided.
The bearing system preferred by the Engineer and that offered by
the Contractor shall be given in the data sheet.
Where grease relief systems are provided there shall be a means
of removing the expelled grease from the bearing without
dismantling any part of the motor and whilst the motor is
operating.
Grease used shall be general purpose type No. 2 or No. 3
consistency having a Lithium complex base with an extreme pressure
additive or as advised by the Engineer.
The Contractor shall indicate in the data sheet the expected
grease life.
The bearings shall have grease reservoirs that will allow more
than 4 000 hours operation without re-greasing.
The B10 calculated bearing life shall be given in the data sheet
and the calculations shall be submitted to the Engineer if
required. The calculated bearing life shall be in excess of 100 000
hours for direct coupled driven loads.
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The bearings shall be fitted with spring loaded 100 ohm platinum
resistance temperature detectors (RTDs). These shall be fitted into
holes drilled into the bearing shells so that the tip of the probe
is touching the outer race. The ball and roller bearing housings
shall also be supplied with a spot face with an M8 tapped blind
hole suitable for the installation of SPM shock pulse transmitter
units.\
An automatic re-greasing system shall be supplied where
specified by the engineer.
4.2.21 Sliprings and Brush gear
4.2.21.1 Brush lifting and slip ring short circuiting gear
Where slip rings and brush gear are fitted, the preference is
for brush lifting and short circuiting gear. On machines below 1
000 kW the brush gear lifting operation may be manual. On larger
machines, brush gear lifting shall be motorised with manual
override.
Such gear shall be fitted with auxiliary interlock switches
operating in the fully "in" and fully "out" position to be used for
interlocking with the main motors starter to prevent starting with
the brush gear in the short circuited position and for the
protection circuit to ensure that the slip rings are shorted and
the brushes lifted within a certain time after starting. All bushes
and pins, forming part of the mechanism, should be protected
against corrosion where practical.
Machines without motorised brush lifting and short-circuiting
gear, shall have brushes rated for continuous duty. The actual
brush configuration shall be set up to suit the load range
specified in the data sheet in Appendix C. All motors shall be
fitted with a label to draw attention to this requirement as
follows:
This motor has a quantity and grade of brushes fitted based upon
the normal nameplate rating of the motor, which is .kW.
Running this motor at a reduced load may damage the brush gear,
may cause excessive brush wear and carbon dust build-up, caused by
over-brushing and/or incorrect selection of brush grade for the
duty.
If the motor is run at a reduced load brushes must be reduced as
per the table below to avoid failure:
Status Current Range
kW Loading
Load Case 1 Full Brushing
Load Case 2 Remove 1 Brush /Ring
Load Case 3 Remove 2 Brushes/Ring
Load Case 4 Remove 3 Brushes/Ring
Load Case 5 Remove 4 Brushes/Ring
7
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The above recommendations are for short term operating
conditions only and the motor should not be run continually at
reduced load without reference/approval from the manufacturer, as
the brush grade may also need to be changed.
When changing and/or reducing brush quantity the filters must
always be cleaned thoroughly and carbon dust cleaned from the brush
gear compartment to avoid flashover and failure.
Figure 1: Brush Information Label
4.2.21.2 Brushgear housing
The brush gear shall be housed in a separate enclosure that is
segregated from the stator cooling circuit. The enclosure shall
have a minimum enclosure rating of IP 55. Comprehensive measures
shall be taken to minimise the contamination of the stator winding
with carbon dust.
Preference will be given to the brush gear housed in a separate
enclosure, preferably on the outboard side of the non-drive end
bearing. If external rings are offered, adequate means must be
adopted to ensure that the leads in the shaft tunnel are rigidly
secured to avoid vibration and subsequent failure.
Washable filters are to be fitted, to collect dust from the
brushes; they shall be located in such a way that removal or
cleaning of the filters will not cause a build-up of dust, in the
enclosure, thus increasing the chances of an electrical flash-over.
Differential pressure monitoring of the filters should be
included.
4.2.21.3 Slip rings and brushes
The Contractor shall provide full details of the construction of
the sliprings, the materials used and the method of fitting to the
shaft. Open ventilated type slip rings shall be used; moulded type
slip rings are not permitted.
The slip ring assembly shall be removable for repair purposes
and have tapped pulling bolt holes for removal.
The slip rings shall have excess material to allow undercutting
of the slip rings whenever necessary. The slip ring shall have a
mark to indicate the excess material. The ring minimum diameter
shall be marked on the motor nameplate or a separate slip ring
nameplate. If a helical groove is machined in the slip rings it
shall be the full depth of the excess ring material.
The slip ring shall be skimmed after fitting to the motor
shaft.
The voltage rating of the slip rings shall be conservative.
Particular emphasis shall be placed on the electrical clearance
between slip rings and earth.
The brush boxes shall be constant pressure type and the brush
grade to be used shall be marked on the motor nameplate.
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4.2.22 Core
The motor stator and rotor cores shall be built from separately
insulated core fully processed plates free from burrs and the inner
periphery of the stator shall be concentric with the frame spigots.
The laminations shall be coated with C5 type material or better to
ASTM A976 Standard Classification of Insulating Coatings by
Composition, Relative Insulating Ability and Application. The rotor
core shall be assembled from laminations of the same grade as that
used for the stator; higher loss steel is not acceptable.
The individual core lamination segments shall be rotated during
the core assembly, stacking or manufacturing process in order to
ensure that the length of the core is uniform.
The cores shall be capable of withstanding repeated heating in
winding burnout ovens at 380 C.
The stator and rotor cores pack shall be clamped in such a
manner as to ensure a tight core under all operating conditions.
The design of the core clamping system shall be such as to allow
the core to be unclamped, repaired and re-stacked in the event of
core damage.
Only solidly fabricated one-piece finger plates are to be used
to provide radial air ducts and to secure end laminations.
Individual fingers fitted at these locations shall not be
permitted.
The stator core, in addition to the friction fit into an
accurately machined casing, shall be keyed, doweled or pinned to
prevent rotation of the core.
The rotor core shall be keyed to the shaft or rotor spider.
Rotor core clamp bolts are to be of good quality steel but
manufactured of steel that is readily available locally and not of
a quality better than EN9. Nuts are to be locked and tack welded or
enclosed in a casing to prevent nuts unfastening or damaging the
windings, should be bolts break.
4.2.23 Winding insulation system (stator and wound rotor)
4.2.23.1 General
The thermal rating of the stator insulation system shall be
minimum class F in accordance with the requirements of IEC 60085
Electrical insulation - Thermal evaluation and designation, both
for thermal endurance and for retention of mechanical properties at
class F temperatures (that is, 155 C hot spot).
See section 4.2.8 Thermal Performance for details of insulation
operating temperature.
In addition to the requirements stipulated below, the stator
winding insulation system, in its entirety, shall possess service
proven performance. The minimum requirement for an adequate service
record is 15 years satisfactory performance in MV motors, which can
be verified through independent references. On request the
contractor shall provide a list of such references with contact
details.
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If any aspect of the system offered (for example operating
voltage, bracing system, manufacturing facility where the coils or
bars are manufactured or inserted into the stator or rotor core and
so forth) has not been proven for 15 years then the full details of
the change and of the associated components and or processes shall
be submitted to the engineer for approval.
The system shall be designed for operation in a humid, wet and
dirty environment with contamination by dust and slurry. The power
supply must be considered as being of poor quality particularly
regarding transient disturbances.
The stator insulation shall be vacuum pressure impregnation
(VPI) system. After winding and bracing the compete stator shall be
vacuum pressure impregnated with a solventless resin. That is, the
impregnating medium in the VPI process shall consist of 100%
reactive components.
The stator insulation shall be a sealed system which is capable
of successfully meeting the requirements of NEMA MG1 section
20.18.2. Evidence of such performance shall be provided in the form
of a witnessed type test for the stator insulation system.
4.2.23.2 Main Ground Insulation
The main ground insulation system shall consist of continuously
taped glass or polyethylene terephthalate film backed mica paper
tape, over the slot and endwinding portions. The main wall
thickness in the slot portion shall be determined by applying a
maximum design insulation stress of 2 kV/mm (calculated using
operational phase voltage to earth=Un/3), but shall not be less
than 1.0 mm radial thickness irrespective of the rated voltage Un.
The calculation for the voltage stress shall be based solely upon
the glass or polyethylene terephthalate backed mica paper tape main
insulation.
The voltage stress in the main wall shall not exceed 2.8 kV /
mm.
4.2.23.3 Strand / Turn Insulation
The strand / turn insulation system shall consist of
continuously taped glass or polyethylene terephthalate film backed
mica paper tape, over the entire conductor. The strand insulation
thickness shall be determined by the contractor to have adequate
mechanical strength to withstand coil manufacturing processes and
to withstand the inter-turn transients in tests and service. The
strand insulation thickness shall not be less than 0,22 mm radial
thickness, irrespective of the rated voltage Un.
Two section series coils (that is two tiers of conductors, all
strands connected in series by one of several arrangements) shall
use either a Roebel transposition or shall be connected such that
the maximum voltage between strands is 50% of the voltage between
coil leads.
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4.2.23.4 End winding & Lead Clearances
The contractor shall calculate the required air clearances
between winding parts and from winding to ground in all regions of
the end winding, connections and leads (including ETD leads, stator
winding termination leads and so forth) such that no potentially
destructive PD (for example, no continuous PD in the same location)
will occur in service using the contractors usual methods of
calculation. However, if the service altitude is over 1 000 m,
instead of using the rated voltage Un, the contractor shall use an
effective voltage (Ueff) which shall not be less than that obtained
by dividing the nominal voltage, Un, by the relative air density as
defined below:
8150
H
n
eff
e
UU
Where H is the design altitude, in meters above sea level.
4.2.23.5 Bracing
The end-winding shall be securely braced to prevent deleterious
vibration, deterioration of insulation properties, in normal
service as well as to prevent excessive movement under short
circuit conditions. Rigid glass filled and resin bonded packing
blocks or bracing cords shall be of adequate dimensions.
4.2.23.6 Slot and Endwinding Partial Discharge Control
Measures
Notwithstanding the normal practice of the contractor, the need
for a corona shield (slot outer corona protection) and for ECP
shall be determined according to the table below using the same
value of Ueff as defined above:
System Component Minimum Requirement for Partial Discharge
Protection
Ueff < 5.5kV Ueff 5.5kV OCP Yes Yes
ECP No Yes
Verify OCP resistance to ground
No Yes
Figure 2: Corona shield and End Corona Protection
4.2.23.7 Requirement for OCP
The following shall apply to the OCP on all coils:
a) The length of the corona shield is such that the end of the
corona shield is never before the end of the core press
fingers.
b) The coil or bar is fitted into the slot in such a way that
reliable and regular contact is made between the corona shield and
core along the complete length of the slot on at least one side of
the coil or bar.
c) The quality of such contact is verified by measurement of the
contact resistance between corona shield and core at least once on
every bar or coil side, after VPI.
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4.2.24 Requirement for ECP
On coils or bars that are provided with ECP it is required
that:
a) The active length of the ECP is in accordance with the
contractors standards for Ueff but with a minimum of 50 mm.
b) The length of the overlap with the corona shield is in
accordance with the contractors standards for Ueff, but with a
minimum of 20mm. This means that the overall length of the ECP
shall never be less than 45mm.
4.2.25 Winding Embedded Temperature Detectors (ETDs)
ETDs shall be fitted to all stator windings as specified
below.
The sensing elements of the ETDs shall be a Resistance
Temperature Detector (RTD) of the wire wound Platinum 100 ohm type,
embedded in an epoxy glass laminate. The RTDs shall be three or
four wire types and the sensing elements shall meet the
requirements of IEC 60751 Class B. The ETDs shall be dual element
and shall not be regarded as being two RTDs in one.
There shall be a minimum of 6 functional ETDs fitted, with an
equal number in each phase of the winding.
The thermal profile of the windings shall be determined by type
testing or numerical simulation. The thermal profile is required
purely to ensure that the ETDs are installed in the hottest
location.
The physical position of the ETDs shall be:
a) One ETD per slot.
b) All ETDs shall be in the slot between top and bottom coil
sides.
c) All ETDs shall be positioned axially at the hottest end of
the slot as determined from the thermal profile.
d) At least three of the ETDs shall be located in slots as close
as possible to the hot spots as determined from the thermal
profile, with an equal number per phase. The ETDs shall be wired to
terminals and used to monitor stator winding temperature.
e) At least three ETDs shall be located approximately uniformly
distributed around the winding, but in slots chosen for coil sides
that are electrically as close as possible to the line terminals.
These ETDs shall be wired to terminals and will be used (by others)
to measure partial discharge and / or temperature.
ETD leads shall not be allowed to come into contact with the
endwindings of the coils. They shall be secured and protected to
prevent risk of mechanical damage during handling in manufacture
and assembly in the factory as well as during assembly and
subsequent maintenance on site. Additional requirements for
clearances are given section 4.2.25.4End winding & Lead
Clearances.
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4.2.26 Wound (slip ring) rotor
The rotor winding shall be as for the stator winding and shall
be star connected.
The rotor open circuit shall preferably less than 1 000 V and
the Contractor shall indicate the actual open circuit voltage in
the data sheet.
4.2.27 Cage rotor
For a cage rotor the materials used, the cross sectional shape
of the bars and end rings, the method of manufacture, the method of
support and the brazing system shall be approved by the
Engineer.
If cuprous bars are used a rectangular profile rather than a
sash or T-bar profile is preferred. The bar size and shape shall be
approved by the Engineer. Brazing of bars to the end ring shall all
be done using an induction heater process.
The rotor end rings shall be of solid forged construction. Split
end rings having the joint brazed will not be accepted. Cast end
rings may only be used if a calculation of the stresses in the end
ring may prove to be safe. However, cast end rings shall not be
used in two pole machines or machines exceeding 500 kW.
If the winding is an aluminium die-casting, a high-pressure
injection method rather than a centrifugal casting method is
preferred. A centre ring is non-preferred and if used shall be
exposed rather than inside the core and be approved by the
Engineer. If the rotor die-casting comprises two cages cast
together or welded together, the manufacturing detail will need to
be approved by the Engineer.
The cage rotor shall be suitable for the starting duty given in
the data sheet. Contractors shall indicate the number of starts in
quick succession the motor is designed for and the maximum
estimated temperature rise of the rotor bars and end rings during
these starts for a "cold" and "hot" rotor. The contractor shall
state the energy dissipated in the rotor per start, on which design
calculations have been based.
4.2.28 Anti-condensation heaters
An anti-condensation heater shall be fitted in the motor frame
suitable for connection in series or parallel for both operation
off both a 220 and 110 volt AC 50 Hz single phase supply.
4.2.29 Main Terminal Boxes and Surge Suppression
Motors shall be provided with approved terminating fittings for
the required cables. Where a particular type and size of motor is
supplied for several different applications, the arrangement of
cable terminating fittings shall permit inter-changeability of
motors and allow one spare motor to serve for all applications
without having to modify the existing cable arrangement.
Horizontal motors smaller than 335 frame size shall be fitted
with terminal boxes that allow cable entry from any one of four
positions, 90 apart, on top of the motor. A spreader/adaptor box,
and cable gland or removable gland plate, shall be provided to
accommodate the cable and cable tails.
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On motors of frame size 335 and above, all six phase ends of the
stator winding shall be brought out to two terminal boxes, one on
each side of the stator, which shall be interchangeable. Unless
otherwise approved, motors shall be delivered with the cable boxes
or gland plates fitted to the right hand terminal box when viewed
from the drive end. The opposite terminal box shall be complete
with a neutral connection and all fittings and shall be totally
enclosed.
Terminal boxes and cable boxes shall be provided complete with
the internal parts, all fittings and cable glands required to
connect the motor for operation.
Terminal box lids shall have lips over the terminal box flange,
so that the gasket will not be exposed to water and dust.
Terminal boxes shall be extremely robust and fabricated from
plate (mild steel or better) of minimum of 3 mm thickness and shall
have a rupturable membrane designed to prevent damage to the
terminal box in the event of internal pressure build up and release
the gases in such a manner as not to endanger persons. A breather
shall be fitted to allow free breathing of the terminal box but
prevent water ingress from rain or from washing down with a high
pressure hose.
The dimensions of terminal boxes and cable boxes shall be
adequate for accommodating the sizes and types of cable specified.
The design of the terminal box shall permit the removal of the
motor without the need to disturb the termination or bend the cable
appreciably.
Motors rated for 3300 V and above shall have provision made, in
the terminal box or connecting chamber, for receiving an approved
surge suppression unit. The space shall be provided whether or not
the surge suppresser is supplied and fitted. The surge suppression
shall be of an approved type and shall be housed in a separate
compartment in the main terminal box to that for the stator line
connections. Bushings through the dividing wall between two
sections of the main terminal box shall connect the stator windings
to the surge suppression devices. The failure of a surge suppressor
shall not cause any damage to the stator terminal connection
compartment of the main terminal box.
NOTE: Surge suppression cannot be fitted on motors driven by a
variable speed drive and must be excluded from motors that will be
speed controlled.
Given that motors may be connected in either star or delta,
depending on the stator voltage, the terminal box used for making
the connection must be large enough for the terminating, and making
off the external cables used for a delta connection. Gland to the
terminal distances and air clearances must not be less than the
same dimensions in the main stator terminal box.
The cable shall be terminated suitable to be heat shrink
insulation terminated and the following minimum air clearances
inside the cable box (allowing for cable lugs) are required as
listed in Table 13.
Ueff 10 000V Ueff 6 000V Ueff 2 300V
Length of insulator Phase to earth Phase to phase
180 mm 120 mm 180 mm
120 mm 90 mm 120 mm
90 mm 60 mm 90 mm
Figure 3: Terminal box minimum clearances
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Where interchangeability is requested, cable boxes shall be as
required in Schedule C.
All stator connections and rotor winding clips are to be brazed.
Soldered connections are not acceptable.
The rotor cable box for wound rotor slip ring motors shall be
separate from the main terminal box, but otherwise similar.
4.2.30 Stiffness
The diameter and length of the rotor core and distance between
bearing centres shall be selected to provide a machine having an
exceptionally rigid shaft, except in the case of two pole machines
that operate above the critical speeds.
The maximum shaft deflection under the worst condition of
unbalanced magnetic pull including deflection due to the mass of
the shaft and rotor core, eccentricity due to bearing clearances,
spigot clearances etc., shall not exceed 10 per cent of the
air-gap. Specifically with motors with pedestal bearings or a
movable stator core design, this 10 per cent will be made up
off:
a) A maximum (deliberate) initial static displacement of the
shaft vertically down not greater than 5% of the air-gap.
b) Assuming the 5% worst-case initial displacement a maximum
additional deflection of the shaft due to unbalanced magnetic pull
not greater than the remaining 5% of the air-gap.
4.2.31 Balancing
The completely assembled rotor with fans and shaft with half
keys shall be balanced both statically when stationary and
dynamically at rated motor speed.
The rotor` shall be fitted with balancing rings to which weights
can be attached for balancing. Weights shall not be fitted to
blades of fans. Balance weights shall be made from steel or
approved material and fixed into position with high tensile steel
bolts locked into position. Balance weights shall be recessed and
shaped to suit the area where fitted.
4.2.32 Earthing of motor
The motor shall be fitted with a main earth connecting stud
welded to the stator frame. The stud shall be situated near the
main stator cable box to facilitate bonding of the cable sheath and
earth conductor to the earth stud.
All non-electrical installation parts of the stator shall be
suitably bonded to this main earth.
4.2.33 Lifting facility
Lifting lugs shall be provided for slinging the motor without
spreader bars.
4.3 Material Properties
4.4 Mechanical Properties
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4.5 Electrical Properties
4.6 Corrosion Protection
Corrosion protection shall comply with the requirements of AA
Specification 164050 and AA CPS.
When the site conditions are corrosive, as described by the
Engineer in the data sheet, the materials and corrosion protection
shall be agreed between the Contractor and the Engineer.
5 QUALITY ASSURANCE PROVISIONS
The requirements of AA REQ 100 shall apply.
The machine manufacturer shall be accredited with
a) ISO 9001
b) ISO 14000
c) ISO 18000
In addition to the requirements of AA REQ 100 Quality
Requirements for Suppliers of Critical Equipment, before
manufacture commences, the contractor shall submit a quality
control plan to the engineer so that he can indicate which tests
will be witnessed.
6 TEST AND INSPECTION METHODS
6.1 Chemical Tests
6.2 Mechanical Tests
6.3 Electrical Tests
6.3.1 General
The following tests shall be performed on every machine:
a) Routine tests
b) Special tests:
1. Core loss test
2. Tan delta on the complete stator
3. No load bearing run
4. Determination of efficiency
5. Vibration
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c) Type tests
Where selected by the engineer in Appendix C, additional
optional tests shall be performed as detailed in IEC 60034-1
Rotating electrical machines. Part 1: Rating and performance and
IEC 60034-9 Rotating electrical machines. Part 9: Noise limits.
Copies of all test certificates, including the type tests, shall
be included in the project documentation. The test certificate
shall indicate the test conditions (such as the number of turns of
the test cable, the current drawn and the flux density in the case
of the core flux test see 6.3.2 below).
6.3.2 Routine tests
Routine tests shall be performed on every machine, as described
in IEC 60034-1 Rotating electrical machines. Part 1: Rating and
performance.
6.3.3 Special tests
The following special test shall be performed on each machine
supplied to this specification:
6.3.3.1 Core loss test
A core loss test shall be performed for the stator core on its
own and for the stator core in the frame, as a routine test for
every motor. This data will be used to assess the suitability or
otherwise of the core for future rewinds, during the life of the
motor.
6.3.3.2 Tan delta on the complete stator
Tests shall be carried out on all completed machines with a
rated stator voltage 3 300V to assess the quality of the dielectric
on the completely wound machine.
Measurements shall be made at room temperature on each phase of
the winding separately, the other phases being earthed and then on
the complete winding (with the phases in parallel). This test shall
be performed at the motors rated supply line frequency (that is, 50
Hz or 60 Hz.) Reduced frequency testing is not acceptable.
With the rated stator line voltage designated as Un, the Tan
Delta values shall be measured at 0.2 Un increments between 0.2 Un
and 1.0 Un. The initial value of 0.2 Un, the value of half of the
increment between 0.2 Un and 0.6 Un and the maximum increment per
0.2 Un shall not exceed the values specified in figure 4 below.
Maximum value of Tan Delta at 0.2 Un
Maximum Value of 0.5 (Tan Delta at 0.6 Un - Tan Delta at 0.2
Un)
Maximum Value Of Delta Tan Delta per 0.2 Un increment
0.0200 0.0060 0.0060
Figure 4: Tan delta test limit values for coils
The capacitance shall also be recorded at each measuring
voltage.
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6.3.3.3 No load bearing run
The machine shall be operated at no load as defined in IEC
60034-1 Rotating electrical machines. Part 1: Rating and
performance and the temperature of the bearings monitored. The test
shall continue until all bearing temperatures stabilise.
6.3.3.4 Determination of Efficiency
In Appendix C the contractor shall state, with reference to IEC
60034- 2 Rotating Electrical Machines. Part 2-1: Standard methods
for determining losses and efficiency from tests (excluding
machines for traction vehicles), what method is proposed to be used
to prove the machine losses.
6.3.3.5 Vibration tests
Each machine shall be tested as per section 4.2.9 Vibration.
6.3.4 Type tests
For each machine type, the contractor shall submit to the
engineer for his approval a type test certificate on an identical
machine. If a type test has not been performed before on an
identical machine, then a type test shall be performed on each
machine type for which no type test certificate exists.
Where a type test is required, a full load temperature rise
performance test shall be carried out on one motor of each type, as
described in 60034-1 Rotating electrical machines. Part 1: Rating
and performance. If more than one identical motor is ordered, only
one motor shall be tested.
6.4 NDE
7 MARKING AND PACKING
7.1 Marking
7.2 Packing
The motor shall be suitable packed and crated for delivery.
The shaft shall be clamped for transport, to safeguard the
bearings.
Any extra support equipment or packing that it is necessary to
remove before putting the machine into service is to be painted in
a distinctly different colour to the main machine and bold notices
to this effect affixed to the machine.
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APPENDIX A: REFERENCED DOCUMENTS
The latest issue of the following documents is deemed to form
part of this specification:
AA REQ 100 : Quality Requirements for Suppliers of Critical
Equipment
AA SPEC 166000 : Lubricants general requirements
AA SPEC 232001 : Reconditioning of white metal bearings
AA SPEC 538032 : Shafts for electric AC induction machines with
frame sizes 355 and larger
ASTM A976 : Standard Classification of Insulating Coatings by
Composition, Relative Insulating Ability and Application
IEC 60034-1 : Rotating electrical machines. Part 1: Rating and
performance
IEC 60034-12 : Rotating electrical machines Part 12: Starting
performance of single-speed three-phase cage induction motors
IEC 60034-14 : Rotating Electrical Machines. Part 14: Mechanical
vibration of certain machines with shaft heights of 56 mm and
higher- Measurement, evaluation and limits of vibration
severity
IEC 60034-15 : Rotating Electrical Machines. Part 15: Impulse
voltage withstand levels of form-wound stator coils for rotating
a.c. machines
IEC 60034-2-1 : Rotating Electrical Machines. Part 2-1: Standard
methods for determining losses and efficiency from tests (excluding
machines for traction vehicles)
IEC 60034-2-2 : Rotating electrical machines Part 2-2: Specific
methods for determining separate losses of large machines from
tests - Supplement to IEC 60034-2-1
IEC 60034-23 : Rotating electrical machines Part 23:
Specification for the refurbishing of rotating electrical
machines
IEC 60034-27 : Rotating electrical machines Part 27: Off-line
partial discharge measurements on the stator winding insulation of
rotating electrical machines
IEC 60034-5 : Rotating electrical machines Part 5: Degrees of
protection provided by the integral design of rotating electrical
machines (IP code) Classification
IEC 60034-6 : Rotating Electrical Machines. Part 6: Methods of
cooling (IC Code)
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IEC 60034-7 : Rotating electrical machines Part 7:
Classification of types of construction, mounting arrangements and
terminal box position (IM Code)
IEC 60034-8 : Rotating electrical machines Part 8: Terminal
markings and direction of rotation
IEC 60034-9 : Rotating Electrical Machines. Part 9: Noise
limits
IEC 60085 : Electrical insulation - Thermal evaluation and
designation
IEC 622271-202 : High-voltage switchgear and controlgear Part
202: High- voltage/low-voltage prefabricated substation
NEMA MG 1 : MOTORS AND GENERATORS
APPENDIX B: RECORD OF AMENDMENTS
Version 1 : New document (P Warner, January 2012)
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APPENDIX C: DATA SHEET TO BE COMPLETED BY THE ENGINEER AND THE
CONTRACTOR FOR EACH MOTOR TYPE
Not all data will be available at the tender stage but will be
required at the contract stage.
CLAUSE
NO
TO BE COMPLETED BY
ENGINEER
TO BE COMPLETED BY
THE CONTRACTOR
1.0 Rating
1.1 Rated output kW 4.2.2
1.2 Rated voltage V 4.2.4
1.3 Temperature rise when operating continuously at voltage
range
4.2.6 Zone A and B
1.4 System fault level 4.2.4 kA
1.5 Frequency Hz 4.2.4 50 / 60 Hz
1.6 Duty 4.2.2 S1
1.7 No. of poles (2, 4, 6, 8 etc) 4.2.2
1.8 Synchronous speed r/min 4.2.2
1.9 Grounding system type: Soild/NER/NEC 4.2.5
1.10 Ground current limited to 4.2.5
2.0 Site conditions
2.1 Maximum altitude above sea level 4.2.3 m
2.2 Maximum ambient air temperature 4.2.3 C
2.3 Minimum ambient air temperature 4.2.3 C
2.4 Cooling water maximum temperature 4.2.3 C
2.5 Cooling water specification 4.2.3
2.6 Corrosion protection required. Manufacturers standard
procedure /Aggressive environment 4.6
3.0 Enclosure
3.1 Enclosure material (steel, cast steel or cast iron)
4.2.14
3.2 Air cooled CACA IP55 4.2.14
3.3 Water cooled CACW IP55 4.2.14
3.4 Totally enclosed fan cooled TEFC IP55 4.2.14
3.5 Open Drip Proof IP22 4.2.14
3.6 Pipe Ventilated IP22 4.2.14
3.7 NEMA Type WP II 4.2.14
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4.0 Cooling system SABS IEC 60034-6 Classification
4.1 CACA (IC5A1A1 or IC6A1A1) 4.2.15
4.2 CACW (IC8A1W7) 4.2.15
4.3 TEFC (IC4A1A1) 4.2.15
4.4 Open ventilation (IC0A1) 4.2.15
4.5 Pipe ventilated (IC1A1 or IC2A1 or IC3A1) 4.2.15
4.6 NEMA weather protected Type II 4.2.15
5.0 Water cooling system
5.1 Water Cooling water inlet temp. C 4.2.15
5.2 Cooling water outlet temp. C 4.2.15
5.3 Cooling water flow rate l/s 4.2.15
5.4 Water cooler maximum pressure kPa 4.2.15
6.0 Limitations for transport or interchangeability
6.1 Shaft height 4.2.14
6.2 Length 4.2.14
6.3 Width 4.2.14
6.4 Height 4.2.14
6.5 Mass 4.2.14
7.0 Motor dimensions
7.1 Shaft height 4.2.14
7.2 Length 4.2.14
7.3 Width 4.2.14
7.4 Height 4.2.14
7.5 Mass 4.2.14
7.6 Motor frame size 4.2.14
7.7 Motor assembly critical speed 4.2.12 4.2.30
7.8 Rotor diameter (D) (metres) 4.2.13
7.9 Rotor active core length(L)(metres) 4.2.13
7.10 D2L (cubic metres) 4.2.13
7.11 Ratio L/D 4.2.13
7.12 Rotor mass (Kg) 4.2.13
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7.13 Distance between bearing centres (Metres) 4.2.13 4.2.30
7.14 Motor shaft centre height 4.2.13
7.15 Motor air gap (on radius) 4.2.19
7.16 Motor direction of rotation (bi-directional /CW or CCW
facing DE)
4.2.7 4.2.18
8.0 Winding insulation system
8.1 Stator winding class of insulation 4.2.6 4.2.23
F
8.2 Wound rotor winding class of insulation 4.2.26 F
8.3 Stator slot wedges (Magnetic / non-magnetic material)
4.2.23
8.4 Date on which Engineer approved insulation system
4.2.23.1
9.0 Motor stator
9.1 Power supply cable type and size 4.2.4
10.0 Motor rotor
10.1 Motor rotor winding (Cage/Wound rotor) 4.2.26 4.2.27
10.2 Slip rings (continuous running/brush lifting and shorting
gear)
4.2.21
10.3 Wound rotor open circuit voltage 4.2.26
11.0 Bearings
11.1 Bearing type. (Grease lubricated ball/roller / Oil
lubricated sleeve end shield mounted / Oil lubricated sleeve
pedestal)
4.2.20
11.2 Bearing manufacturer 4.2.20
11.3 Oil lubrication cooling. (Natural / Force lubrication /
Water jacket cooling)
4.2.20.1
11.4 Sleeve bearing end float (total) 4.2.20.1
11.5 Grease lubrication interval 4.2.20.2
11.6 Ball and roller bearing life 4.2.20.2
12.0 Driven load
12.1 Pump/fan/mill/crusher/conveyor etc. 4.2.8
12.2 Manufacturer/supplier 4.2.8
12.3 Type number 4.2.8
12.4 Inertia (referred to motor shaft) 4.2.8
12.5 Torque/speed curve of driven load 4.2.8
12.6 Direct drive/belt drive/gearbox etc 4.2.8
12.7 Coupling type 4.2.8 4.2.17
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12.8 Coupling to be fitted by motor manufacturer (yes/no)
4.2.8
13.0 Vibration
13.1 IEC Vibration standards 4.2.9.1
13.2 NEMA Vibration standards 4.2.9.2
13.0 Motor Performance
13.1 Motor full load current at rated output, voltage and
frequency
4.2.6
13.2 Temperature rise of windings measured by resistance when
operating at rated voltage and frequency (Guaranteed)
4.2.6
13.3 Calculated temperature rise of windings when operating at
any point in Zone A
4.2.6
13.4 Calculated temperature rise of windings when operating at
any point in Zone B
4.2.6
13.5 Duty Load at which the Contractor guarantees losses and
power factor
4.2.7
13.6 No load losses at Duty Point (Guaranteed) 4.2.27
13.7 Power factor at Duty Point (Guaranteed) 4.2.27
13.8 Number of hours per year that the motor will be operated at
no load
4.2.27
13.9 Cost of energy per hour 4.2.27
13.10 Cost of maximum demand per month 4.2.27
13.11 Losses at Duty Point (Guaranteed) 4.2.27
13.12 Number of hours per year that the motor will be operated
at duty point load
4.2.27
13.13 Interest rate 4.2.27
13.14 Number of years over which losses will be capitalised
4.2.27
13.151 Efficiency at rated output, voltage and frequency
4.2.7
13.16 Efficiency at 75% rated output, rated voltage and
frequency
4.2.7
13.17 Efficiency at 50% rated output, rated voltage and
frequency
4.2.7
13.18 Peak efficiency at % of rated output at rated voltage and
frequency
4.2.7
13.19 Power factor of motor only at rated output, voltage and
frequency
4.2.7
13.20 Power factor of motor only at 75% rated output, rated
voltage and frequency
4.2.7
13.21 Power factor of motor only at 50% rated output, rated
voltage and frequency
4.2.7
13.22 Capacitor rating to achieve power factor of 0.85 at rated
full load, voltage and frequency (kVAR)
4.2.7
13.23 No. of consecutive starts from cold 4.2.10
13.24 No. of consecutive starts from hot 4.2.10
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Energy dissipated in the stator per start 4.2.27
Energy dissipated in the rotor per start 4.2.27
13.25.3
Maximum stator temperature after the number of consecutive
starts from cold and hot as stated in 13.22 & 13.23 above.
4.2.10
13.25 Maximum rotor temperature after the number of consecutive
starts from cold and hot as stated in 13.22 & 13.23 above.
4.2.10
13.26 Maximum permissible stall time from cold without damaging
the motor (secs)
4.2.10
13.27 Maximum permissible stall time from hot without damaging
the motor (secs)
4.2.10
13.28 Maximum number of starts expected for the life of the
motor
4.2.10
13.29 No load current (X rated full load current) at rated
voltage and frequency
4.2.2
13.30 No load power factor at rated voltage and frequency
4.2.2
13.31 Starting (locked rotor) current (X rated full load
current) at rated voltage and frequency
4.2.2
13.32 Starting (locked rotor) power factor at rated voltage and
frequency
4.2.2
13.333 Full load torque at rated output, voltage and frequency
(Guaranteed)
4.2.2
13.34 Starting (locked rotor) torque (X rated torque) 4.2.2
13.35 Peak torque (X rated torque) 4.2.10
13.36 Run up time (secs) 4.2.10
13.37 Critical speed (% of synchronous speed) 4.2.12
13.38 Slip as % of rated synchronous speed at rated output,
voltage and frequency
4.2
14.0 Optional tests required
14.1 Heat run and efficiency test certificate from previous
machine (yes/no)
6.3.4
14.1 Heat run and efficiency test to be included in this supply
(yes/no)
6.3.4
14.2 Test method to be used to prove guaranteed performance
(Actual / Equivalent load method)
6.3.3.4 4.2.7
14.3 Noise level test (yes/no) 6.3.1
14.4 Momentary overload test (yes/no) 6.3.1
14.5 Torque/speed curve test (yes/no) 6.3.1
15.0 Optional items
15.1 Motor base plate (yes/no)
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AA SPEC 538011 MEDIUM VOLTAGE INDUCTION MOTORS VERSION 1
14 JANUARY 2013
COPYRIGHT
APPENDIX D: CERTIFICATE OF COMPLIANCE. TO BE COMPLETED BY
CONTRACTOR
The equipment offered complies fully with the Anglo American
Specification 538011 Medium Voltage Induction Motors clauses as
follows:
CLAUSE NO. COMPLIANCE YES/NO
REMARKS
1.0
2.0
3.0
4.1
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9.1
4.2.9.2
4.2.10
4.2.11
4.2.12
4.2.13
4.2.14
4.2.15
4.2.16
4.2.17
4.2.18
4.2.19
4.2.20
4.2.20.1
4.2.20.2
4.2.21.1
4.2.21.2
4.2.21.3
4.2.22
4.2.23.1
4.2.23.2
4.2.23.3
4.2.23.4
4.2.23.5
4.2.23.6
4.2.23.7
4.2.24
4.2.25
4.2.26
4.2.27
4.2.28
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4.2.29
4.2.30
4.2.31
4.2.32
4.2.33
4.3
4.4
4.5
4.6
5.0
6.1
6.2
6.3.1
6.3.2
6.3.3
6.3.3.1
6.3.3.2
6.3.3.3
6.3.3.4
6.3.3.5
6.3.4
6.4
7.1
7.2