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STANDARD

DOCUMENTCLASSIFICATION

CONFIDENTIAL

REFERENCE RE

TITLE: INFRA-RED SCANNING OF HIGH- SCSASAAW1 1VOLTAGE CURRENT – CARRYINGEQUIPMENT

DATE SEPTEMBER2002

PAGE 1 OF 6REVISION DATE:

SEPTEMBER 2005

COMPILED BY FUNCTIONAL RESP. APPROVED BY AUTHORIZED BY

..............................

O E Mutloane

...................................

Peter Busch

Senior Advisor

..............................

CD Smith

for TESCOD

............................

M N Bailey

DTM for MD (DD)

MGM/mm/AS-2/Aug’02

Contents

Page

1 Scope ........................................................................................................................................ 2

1.1 Purpose………………………………………………………………………………………….2

1.2 Applicability……………………………………………………………………………………... 2

2 Normative references................................................................................................................ 2

3 Definitions.................................................................................................................................. 2

4 Requirements ............................................................................................................................ 3

4.1 Responsibilities ...................................................................................................................... 3

4.2 Substations ............................................................................................................................ 3

4.3 Overhead lines ....................................................................................................................... 34.4 Evaluation............................................................................................................................... 3

4.5 Defect (hot spot) reporting...................................................................................................... 3

4.6 Follow-up................................................................................................................................ 4

4.7 Documentation ....................................................................................................................... 4

Annexes

A Infra-red scanning report .......................................................................................................... 5

B Revision information ................................................................................................................. 6

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DOCUMENT CLASSIFICATIONCONFIDENTIAL

INFRA-RED SCANNING OF HIGH- REFERENCE REV

VOLTAGE CURRENT-CARRYING SCSASAAW1 1EQUIPMENT PAGE 2 OF 6

1 Scope

1.1 Purpose

The purpose of this standard is to set a minimum infra-red scanning frequency and documentationrequirement.

1.2 Applicability

The standard is applicable to all staff responsible for infra-red scanning of substations and lines.

2 Normative references

The following document contains provisions that, through reference in the text, constitute requirementsof this standard. At the time of publication the revision indicated was valid. All standards are subject toreview and party for agreements based on this standard are encouraged to investigate the possibility of applying the most recent revision of the document listed below. Information on currently valid nationaland international standards can be obtained from the Information Centre at Megawatt Park and onEskom documents from the Eskom Documentation Centre at Megawatt Park.

ESKARAAG4: Rev.6, Operating regulations for high-voltage systems.

3 Definitions and abbreviations

All definitions and abbreviations in ESKARAAG4 are applicable to this standard.

4 Requirements

4.1 Responsibilities

The Designated Person or his delegate shall ensure that this standard is implemented and adhered to.

4.2 Substations

Infra-red scanning of high-voltage (HV) current carrying equipment at substations shall be carried outregularly as a means of detecting hot spots, cooling and flow problems on transformers, transformer conservator oil level and also transfomer temperature problems before they lead to equipment failure.

Infra-red scanning shall be carried out, when possible, when the equipment is at or above its normalload.

The minimum scanning frequency shall be:

In major substations >40 MVA every 6 months.

In other substations every 12 months.

Panels loaded to near capacity or above may require scanning more frequently. This particularlyapplies to those panels loaded abnormally due to emergencies, equipment outages, etc. which, if loston fault, could prove to be critical.

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In situations where plant is loaded well below its rating RCM/Criticality analysis shall determine the

frequency.

4.3 Overhead lines

Infra-red scanning may be carried out as required by circumstances and local requirements.

4.4 Newly commisioned Substations/Lines

Newly commissioned substations and lines shall be scanned within a week of commissioning to ensurethat quality work has been done.

4.5 Evaluation

The operator shall evaluate the information available and make a judgement as to the degree of urgency for dealing with any hot spot found.

(This shall be done in co-operation with the person responsible for the equipment).

As a rule of thumb:

Temperature Degree of urgency

0 °C to 10 °C above temperature associated/equivalent item Deal with when equipment is nextavailable.

10 °C to 30 °C above associated/equivalent item Urgent.(for connectors, contacts etc.)

Over 30 °C above associated/equivalent item Extremely urgent.(for connectors, contacts etc.)

Over 20 °C above associated/equivalent item Extremely urgent.(CTs, circuit-breaker heads etc.)

4.6 Defect (hot spot) reporting

All extremely urgent hot spots shall be reported immediately to the person(s) directly responsible for the equipment.

A written report shall be submitted within 24 h after scanning even if this report says “Nothing Found”.

Each “hot spot” shall be clearly identified with its “degree of urgency” indicated (see annex A).

4.7 Follow-up

To ensure the defect(s) has been effectively repaired the equipment shall be re-scanned once it isreturned on-load.

4.8 Documentation

All documentation shall be history recorded in a logical and easily retrievable manner and shall cover atleast:

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a) Programme;

b) Scheduling/actioning;

c) Reports/follow-ups; and

d) Closing off.

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Annex A(informative)

Infra-red scanning report

INFRA-RED SCANNING REPORT Ref No.

FSC: __________________ TSC: __________________

Scanning date: __________________ Panel: __________________

Substation: __________________ Load of panel: __________________

Sketch Degree of urgency

A — WHEN NEXT AVAILABLE

B — URGENT

*C — EXTREMELY URGENT

*D — District immediately Yes No

ACTION TAKEN BY SUPERVISOR AND DETAIL OF REPAIR

__________________________ Name in block letters

_______________________ Signature

__________________________ Date

CERTIFIED CORRECT AFTER RETEST

___________________ Name in block letters

_______________ Signature

___________________ Date

NOTE — Duplicate book used

Annex B(informative)

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Revision information

DATE REV. NO. NOTES

Dec.1997 0 Original issue – SCSASAAW1

Aug 2002 1 Original document re-drafted in accordance with the EskomDocumentation System.

4.2. Text refomated and Infra red scanning on Transfomer added

4.2 Text added

4.4 Text added

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