Cable Systems Standard TNM-DS-806-0843 - Issue 2.0 Dec 01

TNM-DS-806-0843 Issue 2.0 Dec-01

COPYRIGHT © TRANSEND NETWORKS PTY LTD ALL RIGHTS RESERVED

This document is protected by copyright vested in Transend Networks Pty Ltd. No part of the document may be reproduced or transmitted in

any form by any means including, without limitation, electronic, photocopying, recording or otherwise, without the prior written permission of

Transend. No information embodied in the documents which is not already in the public domain shall be communicated in any manner

whatsoever to any third party without the prior written consent of Transend. Any breach of the above obligations may be restrained by legal

proceedings seeking remedies including injunctions, damages and costs.

APPROVED

Cable Systems

Standard

TO BE READ IN CONJUNCTION

WITH AMENDMENT NO. 1


Page 2 of 24 Transend Networks Pty Ltd

C O N T A C T

This document is the responsibility of the Technology & Standards

Group, Transend Networks Pty Ltd, ABN 57 082 586 892.

Please contact Transend’s Performance Improvement Manager

with any queries or suggestions.

R E V I E W D A T E

This document is due for review not later than Dec-02

M I N I M U M R E Q U I R E M E N T S

The requirements set out in Transend's documents are minimum

requirements that must be complied with by contractors, including

designers and other consultants. The contractor is expected to

implement any practices which may not be stated but which can

reasonably be regarded as good practices relevant to the objective of

this document. Transend expects contractors to improve upon these

minimum requirements where possible and to integrate these

improvements into their procedures and quality assurance plans.

A U D I T S

Periodic audits to establish conformance with this document will be

conducted by Transend’s Performance Improvement Department.

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Transend Networks Pty Ltd Page 3 of 24

CONTENTS

1. GENERAL 5

1.1. Purpose 5

1.2. Scope 5

1.3. Objective 5

1.4. Certificate of conformance 5

1.5. Precedence 6

1.6. Deviation 6

1.7. References 6

2. GENERAL REQUIREMENTS 6

2.1. Service Conditions 7

2.2. Performance 7

3. CABLE SYSTEMS 7

3.1. Design of cable systems 7

3.2. Design of Cables 7

4. INSTALLATION OF CABLE SYSTEMS 8

4.1. Cable segregation 8

4.2. Underground installations 9

4.3. Above ground cable installation 10

4.4. Labelling and identification 10

4.5. Conduits 11

4.6. Cable route 11

4.7. Cable length 11

4.8. Cable bending radii 11

4.9. Cable laying 12

4.10. Cable supports 12

4.11. Cable fittings 13

4.12. Earthing of cable sheaths and screens 13

4.13. Dimensioning of cable installation 13

5. EXTRA HIGH VOLTAGE AND HIGH VOLTAGE CABLE SYSTEMS 13

5.1. Design requirements for EHV and HV cable systems 13

5.2. Installation requirements for EHV and HV cable systems 14

6. LOW VOLTAGE CABLE SYSTEMS 15

6.1. Preferred multicore cable types 15

6.2. Segregation of cables 16

6.3. Wiring standards 16

6.4. Wire numbering 17

6.5. Wiring and connection diagrams/tables 20

7. FIBRE OPTIC CABLES 20

7.1. Installation of fibre optic cables 20

8. INSTALLATION OF COMMUNICATIONS AND DATA CABLES 21

9. CABLE SCHEDULES 21

10. CIVIL WORKS 21

11. DATA FOR ASSET MANAGEMENT INFORMATION SYSTEM 21

12. TESTING 22



12.1. Type tests 22

12.2. Routine tests 22

13. INFORMATION TO BE PROVIDED WITH TENDER 23

14. DELIVERABLES 23

15. HOLD POINTS 23

LIST OF TABLES

Table 1 : EHV and HV cable system requirements 14

Table 2 : Preferred multicore cable types 15

Table 3 : Circuit Function Letters 18

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1. GENERAL

1.1. PURPOSE

To define the requirements from cable systems under the responsibility of Transend Networks

Pty Ltd (hereafter referred to as "Transend").

1.2. SCOPE

This standard applies to all cable systems under the responsibility of Transend.

This standard contains requirements for design, engineering, manufacture, construction, testing

at manufacturer’s works, secured packaging, supply, transportation, delivery to site, testing and

commissioning with complete documentation of cable systems and is to be applied to new

installations as well as redevelopment of part or all of existing installations.

This standard applies to all extra high voltage, high voltage and low voltage cables under the

responsibility of Transend.

1.3. OBJECTIVE

Transend requires design, construction, installation and commissioning of equipment and

services as covered in this standard to ensure:

a) that relevant Australian legal requirements are met.

b) that the requirements of the Tasmanian Electricity Code and National Electricity Code are

met.

c) personnel and public safety.

d) safety of Transend's assets.

e) ease in operation and maintenance.

f) reliability and continuity of the AC supply.

g) minimum disruption to the AC supply following a fault.

h) that the requirements of Transend business plan are met.

i) that the exposure of Transend’s business to risk is minimised.

1.4. CERTIFICATE OF CONFORMANCE

a) Before any new and/or modified Cable system is put into service in Transend’s system,

certificate of conformance with this standard must be submitted to Transend. The certificate

of conformance must be duly supported with documents, drawings, test results, test reports,

test certificates, completed check lists and other documents as applicable. Where Transend

has approved deviation to specific requirements of this standard, all such approvals must be

included with the certificate of conformance.

b) Transend will supply blank proforma for certificate of conformance, to be completed by the

Contractor.

c) Cable system will be put in service only after the certificate of conformance has been

accepted by Transend.



1.5. PRECEDENCE

Any conflict between the requirements of the codes, specifications, drawings, rules, regulations

and statutory requirements or various sections of this standard and other associated documents

must be brought to the attention of Transend for resolution.

1.6. DEVIATION

Special approval for a deviation to this standard may only be accorded, if it does not reduce the

quality of workmanship and does not deviate from the intent of the standard. A request for a

deviation must follow a designated procedure that involves approval from Transend. Deviations

if any, must be specifically requested, and approved in writing by Transend before award of

Contract.

1.7. REFERENCES

As a component of the complete specification for a system, this standard is to be read in

conjunction with other standards and documents as applicable. In particular this includes the

project specifications and the following:

AS 1429.1 Electric cables – polymeric insulated

AS 1824.2 Insulation coordination, Application Guide

AS 2067 Switchgear assemblies and ancillary equipment for alternating

voltages above 1 kV

AS 2373 Electric cables for control and protection circuits

AS 2395 Terminals for switchgear assemblies for alternating voltages above

1 kV

AS 2648 Underground marking tape

AS 3000 SAA Wiring rules

AS 3147 Approval and test specifications for electric cables elastomer

insulated for working voltages upto and including 0.6/1 kV

CIGRE SC36 WG04 1997 Guide on EMC in Power Plants and Substations.

IEC 840 Power cables with extruded insulation and their accessories for

rated voltage above 30 kV upto 150 kV – test methods and

requirements

TNM-DS-806-0832 Substation Civil Infrastructure Standard.

TNM-DS-806-0837 General Substation Requirements Standard.

TNM-DS-806-0841 Testing, Commissioning and Training Standard.

TNM-DS-806-0843-001 Cable Systems information to be provided with tender.

TNM-DS-806-0843-002 Cable Systems deliverables.

TNM-DS-806-0845 Substation Ancillary Systems Standard.

TNM-DS-809-0846 Glossary for Standards (terms and definitions are defined in this

document)

2. GENERAL REQUIREMENTS

Project specific requirements for the cable systems will be listed in the project specifications.

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2.1. SERVICE CONDITIONS

a) Environmental conditions and any specific design criteria for particular works will be stated

in the project specifications. Minimum service conditions for cable systems are stated in

document TNM-DS-806-0837.

b) All equipment must be capable of operation at its specified rating without assisted means, for

example, forced cooling will not be permitted to achieve the rated capacity.

2.2. PERFORMANCE

a) Cable systems must ensure reliability, security and redundancy.

b) The selection of the equipment constituting cable systems must be appropriate to satisfy the

design criteria and to meet or exceed the specified performance.

c) The selection of equipment, design and all works associated with the cable systems must

conform to the requirements as specified in document TNM-DS-806-0837.

d) The selection of the equipment must be based on most severe of:

(i) requirements mentioned in this standard;

(ii) project specifications; or

(iii) results from system analysis and requirements as stated in document

TNM-DS-806-0837.

3. CABLE SYSTEMS

3.1. DESIGN OF CABLE SYSTEMS

a) The design of the cable systems must ensure that:

(i) the reliability requirements and service life as stipulated in standard

TNM-DS-806-0837 are met.

(ii) adequate provision is made for future expansion as defined in the project

specifications.

b) The design and design calculations must include, but not be limited to:

(i) cable size and sheath size calculation.

(ii) cable sheath, single or double point-bonding system.

(iii) voltage rise under fault conditions for single point bonding.

(iv) type of installation, (eg. in ground: direct buried/conduit /cable trenches/cable ducts;

above ground; cable tunnel).

(v) selection of cable route.

(vi) for extra high voltage and high voltage cables, thermal performance of the cable

installation.

3.2. DESIGN OF CABLES

Design and selection of cable sizes and cable types must take into consideration the requirements

mentioned below.

a) Cables must be suitable for most onerous of:

(i) outdoor installation;



(ii) indoor installation in ducts; or

(iii) exposed to direct sunlight.

b) To meet the design requirements, electrical and mechanical design of the cable circuits must

be undertaken.

c) Cables must be rated and installed to support the circuit maximum input and output powers,

taking into account the maximum overloads that may occur, without any overheating and

without any degradation to the service life.

d) Appropriate de-rating factors must be applied in the cable sizing calculations for factors that

are different to the conditions nominated by the cable manufacturer in determining the

standard cable current ratings. The de-rating factors must compensate for without limitation:

(i) the variations in the ambient;

(ii) the variations in soil temperatures;

(iii) group heating effect;

(iv) depth of underground installation;

(v) cable laying formation; and

(vi) spacing.

e) the cable oversheath must be designed to withstand the extremely high UV index pertaining

to Tasmania.

4. INSTALLATION OF CABLE SYSTEMS

The cable systems must be installed such that:

a) Their installation is in accordance with manufacturer’s recommendations.

b) Cables must be installed in cable ducts for interior routes or conduits elsewhere.

c) Outdoor cables are laid in ducts unless otherwise specified in project specifications.

d) Cables are not direct buried unless specifically allowed in the project specifications.

e) The installation will withstand any vehicular loading that may occur.

f) All cables are installed for easy access throughout the entire length for future replacement

and repair.

g) All cable supports, ducts and conduits are filled to no more than 50 percent of their working

capacity to permit future expansion or modification.

h) Cables damaged during installation are replaced in their entirety. If Transend has reason to

doubt the integrity of the cable system, Transend reserves the right to reject the cable system

even if there is no sign of it being damaged.

i) Details of the cable installation must be included in the design documentation submitted to

Transend for review and approval before commencement of works.

4.1. CABLE SEGREGATION

a) All cables must be grouped and segregated by type and function.

b) All cables must be grouped and segregated, based on voltage level, to eliminate the

possibility of induced voltages or static over voltages. Grouping must be made as follows

without limitation:

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(i) separate groups of extra high voltage cables for each voltage present.

(ii) separate groups of high voltage power cables for each voltage present.

(iii) 415V/240V cables.

(iv) control cables including CT/VT cables.

(v) DC cables.

(vi) communication and instrumentation cables.

c) If some instances the number of low voltage power cables and control cables installed on a

site may not warrant the installation of a separate duct or support system. For these

installations, special approval must be sought from Transend to allow for cable installation

without segregation in ducts. If Transend does not approve the suggested installation, cables

must be segregated and installed in separate ducts. Where cables are approved to be installed

without segregation in ducts suitable, means must be provided to eliminate possible induced

voltage.

4.2. UNDERGROUND INSTALLATIONS

4.2.1. Excavation

a) Excavation must be performed by hand, unless it can be demonstrated with certainty that no

underground services exist.

b) Care must be exercised at all time to ensure that no underground utilities are damaged during

the excavation process.

c) The Contractor is responsible for the repair of any damaged underground utilities at the

Contractor's cost.

4.2.2. Cable protection

a) The duct must not be reinstated until Transend has inspected the cables.

b) In all locations where cables may be exposed to mechanical damage, suitable means must be

provided to protect the cables.

c) All cables, where they rise from ground, must be mechanical protected by suitable means for

an appropriate height above the ground level.

d) Cables may use the inside of structures as a method of protection.

e) Underground cables and conduits must be protected from mechanical damage by one, or a

combination, of the methods specified in AS 3000 for Category B systems.

f) Cable protection must be placed at a minimum of 300 mm above the cables and must overlap

the cables by at least 100 mm on each side.

g) Where vehicle access is permitted, a heavy-duty traffic barrier must be erected.

h) Cable laid below vehicular pavements and access roads require additional protection. Such

cables must:

(i) be laid within electrical conduits, or by protection, allowing for future replacement

and/or maintenance access.

(ii) be laid such that access does not require the excavation of the road pavement.

(iii) allow access from a location at least 1000 mm, but no more than 2000 mm, from the

edge of the road pavement.



i) Backfilled soil must be free from wastes, metals and large debris. Each layer of backfill

must be consolidated by hand until dense and firm consolidation is obtained.

j) The cables must be additionally protected from future excavations by placing and

identification electrical cable marker tape over the full width of the cables. The marker tape

must:

(i) be a continuous length, orange in colour, complying with AS 2648.

(ii) be positioned at not more than 200 mm above the mechanical protection.

(iii) be lettered with “WARNING”, or "DANGER ELECTRICAL CABLE" or similar

wordings.

(iv) faithfully follow the route of the cable.

k) Approved surface markers must be provided to indicate the position of the cables laid

directly in the ground and conduits. The markers must

(i) be erected immediately on completion of the laying of the cable.

(ii) be placed at a maximum interval of 10 metres to indicate the position of the buried

cables.

(iii) be placed at every position where the cable changes direction.

(iv) be placed as required by Transend.

4.3. ABOVE GROUND CABLE INSTALLATION

4.3.1. Cable installation and support

a) All cables installed above-ground must:

(i) be well supported without visible sag.

(ii) be adequately protected against damage.

(iii) not be loosely bundled in air.

(iv) be installed in parallel as far as practicable.

(v) be easily identified throughout its entire route. They are not to be bunched or crossed.

(vi) be free from kink and unnecessary bends.

b) The number of layers on each level of support system must be kept to a minimum to

facilitate future work. Separation between each level of support must be provided for easy

access to the furthest cable at each level.

4.3.2. Cable installation sealing

a) Used and unused cable conduits and openings must be sealed with vermin-proof, waterproof

and fire resistant sealant material. The sealing materials must be easily removable and

resealable to facilitate future modifications to the cabling.

b) Cable entries at transformer pits, including all duct lids where used, must be sealed with an

approved fire resistant and oil compatible sealant to minimise entry of water and other

foreign material.

4.4. LABELLING AND IDENTIFICATION

a) They are identified throughout its entire length.

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b) all equipment is adequately labelled to provide for safe and convenient operation and

maintenance.

c) Adequate quantities of cable markers are installed to ensure safe operation of the cables.

Approved surface markers must be provided to indicate the position of the cables laid. The

markers must:

(i) be placed at least every 10 metres to indicate the position of the buried cables.

(ii) be placed at every position where the cable changes direction.

(iii) be placed as required by Transend.

4.5. CONDUITS

a) Cable conduits must be heavy duty orange PVC.

b) All cable conduit openings and cable entries in transformer pits, whether used or unused

must be sealed with approved type of fire and oil resistant breakable sealant material to avoid

entry of water or any other foreign material.

a) The conduit entrances at both ends must be completely sealed as necessary to prevent the

ingress of moisture after the installation.

c) There must be no sharp edges in conduits.

4.6. CABLE ROUTE

a) The cable route must be selected after a careful consideration of conditions on site and must

factor the implementation process of the work to avoid minimal disruptions and avoid risks.

b) All cable installation must be neat and follow a most direct, straight route with minimum

number of crossings and minimum number of bends.

c) There must be no sharp bends along the cable installation route.

d) A layout drawing showing the proposed cable route with an illustrative description of the

method of cable installation must be submitted to Transend for review and approval. This

must include, as a minimum, the formation, depth in ground and support above ground.

4.7. CABLE LENGTH

a) Cable must be of sufficient length for their purpose and selected route.

b) While calculating the cable lengths allowance must be given to the following:

(i) terminations,

(ii) possible route deviations that may be found necessary during laying of the cable.

(iii) provision of a spare loop at each end of the cable where the cable length is greater

than 2.0 metres. The spare loop must be sufficient for one re-termination of the cable.

c) All cables must be run in continuous lengths between connected devices. ‘In line joints’ to

make up for shortfalls in lengths are not acceptable.

4.8. CABLE BENDING RADII

a) The requirements from maintaining the bending radii as discussed in this section apply to

both conditions:

(i) during the installation process while the cable is being laid; and

(ii) the installed cable.



b) The minimum cable bending radii must not be less than the recommended bending radii by

the cable manufacturer.

c) If the cables are bent to a radius below the recommended radii in the installation process or

in final configuration, the cables must be replaced in their entirety.

4.9. CABLE LAYING

a) While laying the cables, the cables must be pulled by both the conductor and sheath.

b) Pulling of the cables must use methods and procedures as recommended by the cable

manufacturer.

c) The maximum pulling tension and maximum sidewall force as recommended by the cable

manufacturer must not be exceeded during any process of cable laying.

d) The cable ends must be sealed before it is laid.

e) Suitable means, such as pulleys, rollers at bends and proprietary brands of pulling lubricant

must be used to reduce friction and tension exerted on the cable. The lubricants must:

(i) be compatible with the cable outer sheath.

(ii) not set or harden during cable installation.

(iii) not set in future.

(iv) not consist of oil or grease.

f) Free running rollers must be positioned on the trench bottom to minimise frictional forces.

The curvature of the roller must match that of the cable to ensure that the cable is not

deformed.

g) Skid plates must be installed at bends and maintain a smooth effective curvature not less

than the cable minimum bending radius.

h) The cable must not be used as a means of turning the reel in the laying process, and must be

prevented from being subjected to a reverse bend as it is pulled from the reel.

4.10. CABLE SUPPORTS

a) Cables in buildings and switchyard must be supported by a suitable proprietary cable support

system. The system must:

(i) consist of tray type supports.

(ii) comply with NEMA Standard No VE-1.

(iii) use hot-dipped galvanised steel for indoor installation.

(iv) be designed to carry a safe working load, including allowance for future expansion,

with a minimum design safety factor of not less than 1.5.

(v) be provided with expansion fittings at appropriate spacing for each continuous

straight run where required.

b) Overhead cable support systems must not impede the movement of personnel, vehicle and

equipment.

c) Outdoor cable support systems must not rely on other civil structures for supporting the load.

Freestanding support systems are preferred.

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4.11. CABLE FITTINGS

Cable glands must be of the non-ferrous type designed for armoured or non-armoured cables.

4.12. EARTHING OF CABLE SHEATHS AND SCREENS

a) Earthing of cable systems must as a minimum comply with document TNM-DS-806-0845.

b) Where cables enter or pass through the switchyard or at locations possibly subject to

electromagnetic or electrostatic interference, they must be screened.

c) Screens must be bonded to earth according to the document (CIGRE SC36 WG04 1997).

d) Where single point bonding of sheaths is used, the maximum standing voltage developed at

the cable sheaths at the open-end must be limited to a maximum of 65V.

e) A dedicated earth bar must be fitted within HV cable boxes for earthing of cable sheaths and

screens terminated within the boxes.

f) For protection, control and metering cables, single copper braid/tape must be used for the

screens.

g) Earthing points must be shown on the cable layout drawings, schematics and the wiring

diagrams.

4.13. DIMENSIONING OF CABLE INSTALLATION

The position of all cables must be identified on a drawing. This drawing must detail the position

of the cables including dimensions. All dimensions must be taken from survey or from

structures/boundaries etc. Dimensions must be taken from points that are reasonably expected to

remain in service for the life of the cables.

5. EXTRA HIGH VOLTAGE AND HIGH VOLTAGE CABLE SYSTEMS

5.1. DESIGN REQUIREMENTS FOR EHV AND HV CABLE SYSTEMS

a) EHV and HV cables must be provided with the following:

(i) copper conductor with XLPE insulation.

(ii) copper wire or tape screen incorporated with semi conducting water swellable

material to prevent moisture ingress.

(iii) a lead alloy or alternative metallic moisture barrier. This is not required for cables

operating below 33 kV unless specified in the project specifications.

(iv) a PVC oversheath to prevent the metallic sheath from corrosion. If the PVC

oversheath forms the outer sheath then it must be orange coloured.

(v) a HDPE outer oversheath for additional mechanical protection must be provided as

required. The oversheath must be black, embossed and coated with graphite.

b) The design of the EHV and HV cable systems must ensure:

(i) that the over-sheath is fire proof.

(ii) all transformer cables are rated at 1.5 times the maximum MVA rating of the

transformer, considering the most unfavourable system voltage.

(iii) that where single point bonding is used, the maximum standing voltage developed at

the cable sheaths at the open-end must be limited to a maximum of 65V. A removable



connection or link must be provided at the earth end to facilitate testing of the cable

oversheath.

(iv) cables operating at 88 kV or above must be provided with explosion proof link boxes

if required by the design.

(v) voltage parameters must be in accordance with the point of installation and project

specifications.

(vi) cable technical parameters must be in accordance with Table 1.

Table 1 : EHV and HV cable system requirements

Sr. No. Description Unit Requirement

1. Design conductor temperature °C 90

2. Maximum conductor temperature °C 105

3. Short time current withstand ratings

Conductor

Copper screen including metallic over-sheath

- Refer to Project

Specifications

4. Short circuit duration (seconds) sec Refer to Project

Specifications

5. Maximum conductor temperature designed for the

short circuit rating °C 250

5.2. INSTALLATION REQUIREMENTS FOR EHV AND HV CABLE SYSTEMS

5.2.1. EHV and HV cable installation

The cable systems must be installed such that:

a) the length of cables installed in air must be kept to a minimum. Where portions of cables are

installed in air, ventilation and / or shading must be provided.

b) all cable tails must have highly visible coloured phase identification marking on them.

Where single core cables are installed, the cables must be marked with permanent phase

identification marks at least every 10 metres of a constant run and at every change of cable

direction.

c) where conduits are used, they must have an internal diameter not less than twice the cable

overall outer diameter.

d) appropriate trench base and back filling materials are used, taking into account thermal

conductivity requirements.

e) a continuous layer of marker tape is installed at a depth of 150 mm below ground level.

5.2.2. Cable accessories

All accessories necessary for the effective and efficient implementation of the cable systems

must be supplied. As a minimum the following accessories must be provided:

a) Outdoor cable sealing ends. EHV cable sealings must:

(i) be suitable for outdoor installation

(ii) have a creepage distance greater than 50mm per kV in accordance with AS1824-2.

(iii) have a rated 1 minute power frequency withstand (dry) and lightning impulse

withstand voltage of magnitude as stated in the standard TNM-DS-806-0831 and

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TNM-DS-806-0844, depending on the nominal voltage of the power system where the

cable is installed.

(iv) have primary line terminal compliant with AS2395.

(v) have a support that maintains the minimum ground safety clearance as specified in

AS2067.

b) Cable terminations.

c) Earthing cables. Earthing cables must be:

(i) constructed of stranded copper.

(ii) appropriately rated for greater of:

•••• the future maximum earth fault rating at site; and

•••• 25kA, 0.5s.

d) Sheath voltage limiters.

e) All bonding leads and cabling.

f) Link boxes.

g) Support structures.

6. LOW VOLTAGE CABLE SYSTEMS

Low voltage cable systems include all cable installations within the boundary of the works,

including those for protection, control, metering and power circuits.

Multicore cables must have a minimum of 10 % spare cores. Spare cores must have sufficient

length to allow termination on any terminal in the cubicle terminal strip.

6.1. PREFERRED MULTICORE CABLE TYPES

a) Multicore cables for low voltage applications must be circular, stranded, plain annealed

copper conductor, 0.6/1kV PVC insulated, PVC sheathed and screened. Preferred sizes are

given in the Table 2.

b) Multicore cables with white sheath, must have core numbers inscribed on the sheath.

Table 2 : Preferred multicore cable types

Cores mm2 Strands Screen Cores Sheath Standard

Instrumentation Cables

2 pr 0.5 7/0.3 Cu Al Electrostatic W Bk Bk PVC



Control Cables

2 1.5 7/0.5 Cu Single Cu Tape W Bk PVC AS 2373.1

4

1.5 7/0.5 Cu Single Cu Tape W Bk PVC AS 2373.1





Power Supply Cables

2+E 2.5 7/0.67 Cu R Bk G/Y Org PVC AS 3147

2+E 4 7/0.85 Cu R Bk G/Y Org PVC AS 3147

Current and Voltage Transformer Cables


4 4 7/0.85 Cu Single Cu Tape W Bk PVC AS 2373.1



6.2. SEGREGATION OF CABLES

a) Cable runs must not give rise to induced voltages or build up of static overvoltages. Where

parallel runs are unavoidable, the control and auxiliary cables should be separated from the

busbars by the maximum practicable distance.

b) Switchyard cables entering the control building must be physically separated from the

internal cables and from cables containing low-level signal circuits.

c) Separate individual cables must be used for each of the following purposes:

(i) AC Voltage Transformer secondary circuits.

(ii) AC Current Transformer secondary circuits.

(iii) DC controls.

(iv) DC supplies.

(v) analog control signals.

(vi) revenue metering.

d) AC and DC circuits must not be combined in the same cable.

6.3. WIRING STANDARDS

6.3.1. General

a) Secondary wiring must be terminated in clamp type screw tightened terminals where screw

does not bear a direct pressure on the wire.

b) Looping connections between three or more devices on a panel must be arranged to achieve

the shortest route length.

c) Where DC bus positive supplies are required in panels, the corresponding negative must be

included on an adjacent terminal irrespective of whether it is required in the internal wiring.

d) If a panel contains terminals or other items connected to 415/240 volts AC then these parts

must be shrouded, a danger label provided and a note to this effect must be placed on the

wiring diagram.

e) Wiring is to be designed to be protected from heat damage or be heat resistant where

required. This applies for example for wiring to anti-condensation heaters.

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6.3.2. Standard wire sizes

a) Both panel internal wiring and external control/auxiliary cabling must be sized and rated to

fit for the application purpose in regard to normal voltage and current ratings, voltage drop,

and short-circuit rating.

b) Minimum of V-90 grade insulation.

c) The minimum standard for wiring sizes is:

(i) Current transformer wiring and earth wiring are 7/0.67 (2.5mm2).

(ii) All other wiring is 30/0.25 (1.5mm2).

(iii) Wiring for circuits carrying data must be 7/0.030 shielded pairs

(iv) Only non-standard wire sizes must be shown on the wiring diagram.

6.3.3. Standard wire colours

The standard for wiring colours is:

a) DC wiring must be grey.

b) AC wiring must be red, white, blue or black as required.

c) Earth wiring must be green/yellow.

d) Only wire colours other than grey must be shown on the wiring diagram.

6.3.4. Wire termination

a) Both ends of each wire must carry wire numbers as shown on the wiring diagram or in the

wiring /connection table.

b) Wires connected to the equipment side of a trip link must be fitted with red PVC sleeving or

white ferrule with red letter “T” (approximately 10mm in length) located between the link

and the wire number.

c) Conductors of more than 7 strands which terminate at tunnel type terminals must be fitted

with Klippon ‘Boot Lace” ferrules or similar.

d) Ferrules must be fitted firmly on the insulation as close as possible to the terminal. Clip on

ferrules or printing direct onto the insulation will not be permitted.

6.4. WIRE NUMBERING

New wire numbers must be used. The wire number schedule must be marked up for the station

with any new numbers used in the design. The wire number schedule is in a hard copy format

and must be updated by hand.

6.4.1. Wire number code

a) The alphanumeric code for small current wire marking comprises:

(i) A prefix letter, indicating function.

(ii) A number, giving wire identity.

(iii) A suffix letter, indicating association with repetitive main circuit.

b) The code markings must be put on both ends of each wire, and must be unique such that in

any one station, no two wires of different origin will have the same code marking. Every

uninterrupted branch of any connection must bear the same code marking. Intervening

terminals do not require a change of wire code marking.



c) In each circuit the code marking must change when the circuit passes through a device which

affects, or is affected by, the operation of the device. Links that are integral with terminals

but not identified as links must not require a change of wire code marking.

d) Where it is necessary to identify branches which are common, for example the neutral of a

CT, different code markings must be used if the branches are common through identified

links or are connected to separate terminals which are then common by removable

connections.

6.4.2. Wire number prefix letter

a) Each wire must have a prefix letter to denote its circuit function, for example secondary

circuit of a CT for primary protection, VT supply for instruments, closing and tripping

circuits for a circuit breaker. These are given in the column under “Circuit Function

Letters”.

b) Wires originating from apparatus that serves more than one function in series must bear the

prefix letter of the first function in the circuit.

c) Where relays are used, the coil and contact circuits do not necessarily bear the same function

letter. This should be determined by the function of the individual circuit containing them.

For example, the coil circuit of an interposing relay may be W, but the contact circuits could

bear prefix letters such as K, L or N as appropriate.

d) Current and voltage transformer function letters must follow through any interposing and

auxiliary current and voltage transformers, including such transformers when used for light

current circuits. Where an AC supply, reflecting the primary quantities and derived from a

current or voltage transformer, is rectified for the operation of instruments or relays, the DC

circuits may carry the same function letter as the AC circuit.

e) Circuits with functions not included in Table 3 must not have prefix letters.

6.4.3. Wire number numerals

Each wire must have a number identifying the individual wire in its function. This may consist

of one or more digits as required. For functions, A to G the numbers must be confined as

indicated in Table 3. If more than 100 are required then multiples thereof should be added, thus

29 may be extended to 129 or 229. Positive wires from a DC source must bear odd numbers and

negative wires must bear even numbers. Where coils or resistors are connected in series, the

change from odd to even numbers must be made at the coil or resistor end nearest to the negative

pole of the supply.

6.4.4. Wire number suffix letter

In certain cases, a wire must have a suffix letter to identify its association with a main circuit.

This will apply in cases of repetitive main circuits such as occur in installations of multiple

machines, transmission lines, station batteries etc.

Table 3 : Circuit Function Letters

CIRCUIT FUNCTION LETTERS WIRE NUMBERS *

A. Current transformers for primary protection, excluding

overcurrent.

B. Current transformers for busbar protection.

C. Current transformers for overcurrent protection (including

combined earth-fault protection and instruments).

10-29 Red phase

30-49 White phase

50-69 Blue phase

70-89 Non phase specific,

TNM-DS-806-0843

Issue 2.0 Dec-01



D. Current transformers for metering and voltage control.

E. AC reference voltage for instruments, metering and

protection

F. AC reference voltage for voltage control.

G. Reference voltage for synchronising

residual circuits &

neutral CTs

90 Earth wires directly

connected to the earth bar.

91-99 Test windings

normally inoperative.

H. AC and AC/DC supplies.

J. DC main battery buses.

K. Closing and tripping control circuits.

L. Alarms and indications initiated by auxiliary switches and

relay contacts excluding those for remote selective control

and for general indication equipment

M. Auxiliary and control motor devices eg. governor motor,

rheostat motor, generator AVR control, spring charging

motors, transformer cooler motor control, motors for

disconnector operation.

N. Tap change control, including AVC, tap position and

progress indications.

O. An indication that the ferruling is not in accordance with the

general scheme and that if it is not altered double ferruling

will be required for coordination with the remaining

equipment in the station.

Any number for one upwards.

Wire numbers should

preferably increase from the

source so that low numbers

are a general indication of

importance to the circuit

P. DC tripping circuits used solely for busbar protection

R. Interlock circuits not covered above.

S. DC instruments and relays, exciter and field circuits for

generators.

T. Pilot conductors (including directly associated connections)

between panels, independent of the distance between them,

for pilot-wire protection, for inter-tripping or for both.

Any number from one

upwards

Wire numbers should

preferably increase from the

source so that low numbers

are a general indication of

importance to the circuit.}

U. Spare cores and connections to spare contacts. Spare cores must be

numbered from one upwards

in each cable, and must be so

arranged that they can be

readily identified on site with

the cable containing them.

This must be achieved by

suitable grouping, and unless

the location of each group is

clear from the diagram, the

groups must be labelled.

Alternatively, the core number

must be preceded by the cable

number.

W. Connections to and from light current control equipment.

X. Generally, all circuits to and from remote terminal units.

Y. Telephones and Communications (Fibre Optic)

Any number from one

upwards.




* If, for functions A to G, more numbers are required, add multiples of one hundred.

(For example, 10-29 may be extended to 110-129, 210-229 etc.)

6.5. WIRING AND CONNECTION DIAGRAMS/TABLES

a) The connection of all equipment must be shown on wiring connection diagrams/tables.

b) Termination diagrams must be combined with equipment wiring diagrams.

c) Wiring diagrams must show the following details for each cubicle, cabinet, device or other

equipment to which the Contract cabling is to be connected:

(i) The cubicle designation.

(ii) All terminal strips or terminals in there correct relative location.

(iii) A wire number (or blank space in the case of a spare terminal) against each side of a

terminal.

(iv) For each cable, the cable identification numbers, the total number of cores and the

number of spare cores and the designation of the cable.

(v) The wire number of each core in each cable.

d) Equipment removed from service must be deleted from any existing drawing/table.

e) When removing equipment from service it must be ensured that looping of signals to other

equipment that is to remain in service is maintained. ‘Tee-offs’ or in-line joins on looping

wires are not acceptable. Rewiring is required.

7. FIBRE OPTIC CABLES

7.1. INSTALLATION OF FIBRE OPTIC CABLES

a) All fibre optic cables must be installed in telecommunications conduits (white) with a

minimum diameter of 32 mm, so that cables will be protected from the weight of other

cables, crushing, ground disruption or any other environmental abuse. The conduit should

be identified suitably at regular intervals. Such identification will be provided at a minimum

of 3 metre intervals.

b) A draw wire must be provided in each conduit for future use.

c) Cable pits must be provided at every bend and other suitable locations.

d) Any fibre optic cable run indoors must be installed in flexible telecommunication conduit to

prevent mechanical damage. The conduit must not be laid under other cables.

e) All fibre optic cables must be installed using proper installation techniques with particular

care exercised during the installation.

f) Cables must not be subject to excessive pulling tension, sharp jerks, kinks or twists that may

damage the cables. There must be no sharp bends along the installation route or sharp edges

in conduits.

g) There must be no more than three 90 degree changes in direction for any single cable pull. If

so then the cable must be pulled through to an intermediate point after the third 90 degree

change of direction and the cable must then be backed.

h) The minimum bending radii of the fibre optic cable must be in accordance with those

recommended by the cable manufacturer during installation and at the as-installed position.

TNM-DS-806-0843

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i) The cable must be under minimal tensional stress at the completion of the installation.

j) No joints must be allowed along the length of the fibre optic cables.

k) The cable must be sufficiently covered in pulling lubricant and the cable end must be

completely sealed and made waterproof before it is pulled into the conduit.

l) The conduit entrances at both ends must be completely sealed to prevent the ingress of

moisture after installation.

m) Sufficient length of spare fibre optic tail must be left for termination.

8. INSTALLATION OF COMMUNICATIONS AND DATA CABLES

A qualified communications officer must carry out all communications and data cable

installation. The qualified communications officer must have proven experience in accordance

with good engineering practice. Transend has the right to reject the work which, in Transend's

opinion, has not conformed to this standard and associated documents, or the workmanship is

substandard.

9. CABLE SCHEDULES

a) New or updated existing cable schedules must be prepared to show all cables added or

modified for the works.

b) Cable schedules must show for each cable:

(i) cable identification number.

(ii) from/to information, showing the location of the two cable ends in separate columns

by cubicle designation or device description with, where applicable, the device

number as shown on the circuit diagrams.

(iii) brief description of route, listing cable trays, trenches, etc. by identification number or

letter.

(iv) details of cable (type, conductor size, number of cores, route length in metres).

(v) type and size of cable glands.

10. CIVIL WORKS

All civil works associated with Cable System must be in accordance with document

TNM-DS-806-0832.

11. DATA FOR ASSET MANAGEMENT INFORMATION SYSTEM

a) Transend maintains a comprehensive “Asset Management Information System” (AMIS) that

contains all design, test results and the condition of all Transend assets. The AMIS also

contains maintenance regimes for all assets.

b) The Contractor must provide information required to maintain the currency of AMIS for

each asset in standard proformas. The proformas will be provided by Transend to the

selected Contractor. Proformas are required to be filled for new assets and for

decommissioned assets.

c) The filled up proformas must be filled in and submitted to Transend as below:

(i) Design information and maintenance regime information for all assets must be

submitted to Transend before commencing installation on site.



(ii) Information on test results for all assets must be submitted before commissioning.

12. TESTING

a) Testing, installation and commissioning must comply with the requirements of the document

TNM-DS-806-0841.

b) All components of Cable systems must be duly tested in accordance with relevant applicable

Australian and International standards. Where tests are optional in the standards, it will be

considered that these tests are required by Transend, unless otherwise requested by

Contractor and agreed in writing by Transend before the award of Contract.

c) All test reports must be forwarded to Transend for approval and acceptance. The tests will

be considered as completed, only after, an approval and acceptance of test results by

Transend in writing. A list of the tests to be conducted on the Cable systems is given below.

12.1. TYPE TESTS

a) Type tests are intended to prove the soundness of design of the systems and their suitability

for operation under the conditions detailed in the specifications. Type tests must be carried

out before the delivery of the system. A certified test report, detailing the results of such

tests along with the procedures followed, must be provided to Transend. These tests must

have been made applied to a system of identical design with that offered, or on a system of a

design which does not differ from that offered in any way which might influence the

properties to be checked by the type test.

b) Where such tests have already been performed, a copy of type test reports that qualifies for

the exemption from conducting these tests must be provided with the tender.

c) For voltages 88 kV and above, relevant type tests for cables as specified in IEC 840 will

apply and for voltages below 88 kV, relevant type tests for cables as specified in AS 1429.1

will apply.

12.2. ROUTINE TESTS

a) The routine tests must be conducted on the complete system to prove quality of manufacture

and conformance with the relevant performance requirements of the applicable standards.

Splitting of routine tests into separate phases for individual components of the system is not

acceptable. Routine testing must be performed at the manufacturer’s works before delivery.

d) Procedures for routine tests with supporting documentation must be submitted to Transend

for approval and acceptance. Routine tests will not be conducted unless the routine test

procedures have been accepted and approved by Transend.

d) Routine test results and certificates must be submitted to Transend for approval and

acceptance. Routine tests will not be considered as completed only after Transend approves

and accepts the test results.

e) Routine factory test results must be approved and accepted by Transend before dispatch of

equipment to site.

f) As a minimum, the tests stated below must be conducted.

12.2.1. Site tests

Site installation and commissioning tests must be conducted on the installed system after

erection on site and before it is put into service to prove that it has not been damaged during

transportation or erection. The site test procedures must be submitted to Transend for approval.

TNM-DS-806-0843

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Site test reports must be approved and accepted by Transend before placing equipment in

service.

As a minimum the tests stated below must be conducted:

(i) Phasing / continuity check.

(ii) Oversheath bonding contact resistance measurement where applicable.

(iii) 10 kV DC oversheath test.

(iv) Insulation resistance test.

(v) High voltage DC or AC test.

(vi) Sheath voltage limiter test where applicable.

13. INFORMATION TO BE PROVIDED WITH TENDER

Requirements for information to be submitted as part of the tender are outlined in document

TNM-DS-806-0843-001.

14. DELIVERABLES

Requirements for project deliverables are outlined in document TNM-DS-806-0843-002.

15. HOLD POINTS

The requirement of documentation is listed in the deliverable schedule in document

TNM-DS-806-0843-002.

The hold points for Cable system include:

a) "Analysis and preparatory documentation" must be submitted before "detailed design" for

Transend's review, comments and approval.

b) "Detailed design documentation" must be submitted before manufacturing or procurement of

equipment, for Transend's review, comments and approval.

c) "Inspection and Test Plan" must be submitted before any testing of equipment, for

Transend's review, comments and approval.

d) "Invitation to witness testing" must be submitted before any testing of equipment, for

Transend's arrangements to witness.

e) Complete updated design documentation, operations and maintenance manuals must be

submitted before "Factory Acceptance Testing (FAT)" for Transend's preparation to attend

FAT.

f) Draft training manuals must be provided at least three months before training, for Transend's

review, comments and approval.

g) Final training manuals must be provided at least two weeks before training, for use of

training team.

h) "FAT" must have been witnessed by Transend and FAT results approved by Transend,

before "pre-commissioning tests".

i) All non-conformances as identified during FAT must have been completed before

commencing any pre-commissioning tests.



j) Information required for AMIS pertaining to design and maintenance regimes must be

submitted to Transend before commencing installation.

k) "Pre-commissioning tests" must have been witnessed by Transend and test results approved

by Transend, before "commissioning tests".

l) All non-conformances as identified during pre-commissioning tests must have been

completed before commencing any commissioning tests.

m) Results of commissioning tests must have been approved by "System Controller", other code

participants and relevant testing authorities as per the requirements of the Code, before

commissioning.

n) "Commissioning tests" must have been witnessed by Transend and test results approved by

Transend, before "energisation".

o) All non-conformances as identified during commissioning tests must be completed before

commencing any energisation.

p) "Training" must have been completed before energisation.

q) Information for AMIS pertaining to test results must have been submitted to Transend before

energisation.

r) Certificate of conformance with contract specifications, standard specifications, codes and

standards with associated documents, drawings, test results, test reports, test certificates,

completed check lists and other documents must be submitted and will have been accepted

and approved by Transend prior to energisation.

s) Transend must have completed the Inspection of each asset before its energisation.

t) All as-built documentation, software licences, operation and maintenance manuals, test

results and test certificates must be submitted to Transend and be accepted by Transend prior

to practical completion.

u) Conduits must not be reinstated until Transend has inspected the cables.

v) Location of all buried services must be established before commencing any excavations.

Form No: TNM-GS-809-0101/012 (October 2004)


Date Published: 05/12/2005

AMENDMENT NO. 1 TO

DOCUMENT #: TNM-DS-806-0843Issue # 2

TITLE: CABLE SYSTEMS STANDARD

AMENDMENTS

Insert new section: 4.14 Removal of Redundant Cables

Before removing redundant cables and wiring, both cable ends must be appropriately identified, disconnected and

decommissioned.

Wherever possible, redundant cables should be completely removed from the duct, tray, tunnel, conduit or other

storage medium within which the cable resides. In some cases full removal may not feasible due to:

� interwoven cables preventing removal of a single redundant cable

� large number of cables installed in a single location causing cables to wedge tightly

In these situations where it is deemed that damage may occur to adjacent cables, the redundant cable must be

terminated as close as practicable to the transition point between cable storage mediums.

For example, where a redundant cable passes from a tray into a conduit and the cable can not be pulled clear of the

conduit without damaging adjacent cables, the redundant cable must be cut as close as practicable to the conduit

end.

Where cables are stored in ducts, all duct covers must be removed before commencing cable removal. This will

ensure that the assessment of the likelihood of damage to adjacent cables is performed with greater accuracy prior to

any removals occurring.

Unless requested otherwise by Transend, where the redundant cable is direct buried the cable will be cut below the

substation ground level (SGL).

All redundant cables will be disposed of by the Contractor unless otherwise specified by Transend.

Ducts, cable trays, conduits or other cable storage mediums must be left in a tidy, orderly and secure condition.

Redundant inter-panel cabling and wiring must be removed completely.

Under some circumstances it may be difficult for the contractor to identify the decommissioned cable requiring

removal (eg. where numerous cables are in close proximity within an enclosed space). If, after making all reasonable

attempts the Contractor believes they are unable to identify the correct cable then, after approval by Transend the

cables may be cut and capped at an alternative location as agreed with Transend.

All cables that have been cut off are to be treated as follows:

� All cuts are to be square through the cable;

� Cable ends are to have a heat shrink cap fitted;

� Original cable numbers are to be retained on sealed cable ends.

If the original cable numbers are illegible or in poor condition then the Contractor must reapply the cable number.

Additional marking to indicate ‘redundant’ (eg Large red ‘R’ on number tag) must also be fitted to the cable.

Cable Systems Standard TNM-DS-806-0843 - Issue 2.0 Dec 01

Documents

extra high

cable storage

transend networks

single point

completed

fibre optic

original cable

hv cable systems