金属管道上的电气危害

CONTENTS

	Page
FOREWORD	4
1 SCOPE	5
2 APPLICATION	5
3 REFERENCED DOCUMENTS	5
4 DEFINITIONS	5
5 ACCEPTABLE VOLTAGE LIMITS	5
6 LOW FREQUENCY INDUCTION (LFI)	9
7 CAPACITIVE COUPLING	12
8 EFFECTS OF LIGHTNING	13
9 CONDUCTIVE EFFECT—EARTH POTENTIAL RISE (EPR)	14
10 OTHER HAZARDS	15
11 INTERACTION BETWEEN PROTECTIVE EARTHING SYSTEMS ON PIPELINES AND CATHODIC PROTECTION SYSTEMS	17
12 COMMISSIONING AND MAINTENANCE OF PIPELINE EARTHING SYSTEMS	17
APPENDICES
A LIST OF REFERENCED DOCUMENTS	19
B DEFINITIONS	20
C LOAD CURRENT LFI EXAMPLE CALCULATION	22
D FAULT CURRENT LFI EXAMPLE CALCULATION	25
E EFFECTS OF A.C. TRACTION SYSTEM ON A NEARBY PIPELINE	34
F PIPELINE LOOP IMPEDANCE	39
G SAMPLE CALCULATION OF INTERCEPTED CAPACITIVE CURRENT	45
H EPR NEAR A HIGH VOLTAGE INSTALLATION	48
I MECHANICAL HANDLING OF PIPE LENGTHS	59
J INTERACTION OF CATHODIC PROTECTION SYSTEMS WITH PIPELINE PROTECTIVE EARTHING SYSTEMS	61
K BIBLIOGRAPHY	63

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Australian/New Zealand Standard™

Electrical hazards on metallic pipelines

2

AS/NZS 4853:2000

This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL/1, Wiring Rules. It was approved on behalf of the Council of Standards Australia on 3 November 2000 and on behalf of the Council of Standards New Zealand on 27 October 2000. It was published on 1 December 2000.

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The following interests are represented on Committee EL/1:

The Association of Consulting Engineers Australia

Australian Building Codes Board

Australian Electrical and Electronic Manufacturers Association

Communications, Electrical Plumbing Union

Electrical Contractors Association of New Zealand

Electrical Contractors Association Qld

Electrical Safety Organisation (New Zealand)

Electricity Supply Association of Australia

Institute of Electrical Inspectors

Institution of Engineers Australia

Insurance Council of Australia Limited

Ministry of Commerce New Zealand

National Electrical and Communications Association

New Zealand Council of Elders

New Zealand Electrical Institute

Regulatory authorities (electrical)

Telstra Corporation Limited

Additional interests participating in the preparation of this Standard:

Catholic Protection Consultants/Installers

Electrical Protection Engineers

Gas Suppliers

Pipe Manufacturers

Pipeline Installers

Pipeline Operators

Railways

Water Authorities

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Keeping Standards up-to-date

Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased.

Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Australia web site at www.standards.com.au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue.

Alternatively, both organizations publish an annual printed Catalogue with full details of all current Standards. For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options. For information about these services, users should contact their respective national Standards organization.

We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia International or Standards New Zealand at the address shown on the back cover.

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This Standard was issued in draft form for comment as DR 99086.

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Electrical hazards on metallic pipelines

Australian/New Zealand Standard™

AS/NZS 4853:2000

First published as AS/NZS 4853:2000.

COPYRIGHT

© Standards Australia/Standards New Zealand

All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.

Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020

ISBN 0 7337 3683 1

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PREFACE

This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL-001, Wiring Rules.

The objective of this Standard is to provide guidelines on how to limit the electrical hazards which may appear on metallic pipelines, to identify some additional safeguards which may be necessary, and to specify acceptable electrical limits on pipelines.

This Standard also provides a range of informative appendices (which is not intended to be exhaustive) on the following subjects, which have a bearing on the application of the Standard:

1. (a) Sample methods of calculation of induced and other voltages from high voltage power lines and a.c. electric rail on pipelines.
2. (b) Methods of controlling or reducing the induced or coupled voltages on pipelines, to achieve the prescribed values.
3. (c) Precautions available to mitigate hazards due to fault conditions on the high voltage system.
4. (d) The interaction of cathodic protection systems with protective earthing systems and some suggested means of resolving the resultant problems.
5. (e) Check lists of data that may be required for calculation of low frequency induction (LFI) from the electricity transmission organization and from the pipeline owner or authority.
6. (f) Pipeline lightning protection.
7. (g) A brief bibliography on the technical matters addressed in this Standard.

During preparation of this Standard, reference was made to documentation provided by Brisbane Water and acknowledgment is made of their assistance.

The terms 'normative' and 'informative' have been used in this Standard to define the application of the appendix to which they apply. A 'normative' appendix is an integral part of a Standard, whereas an 'informative' appendix is only for information and guidance.

Symbols used in equations in this Standard are defined in relation to the particular equations in which they occur.

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CONTENTS

	Page
FOREWORD	4
1 SCOPE	5
2 APPLICATION	5
3 REFERENCED DOCUMENTS	5
4 DEFINITIONS	5
5 ACCEPTABLE VOLTAGE LIMITS	5
6 LOW FREQUENCY INDUCTION (LFI)	9
7 CAPACITIVE COUPLING	12
8 EFFECTS OF LIGHTNING	13
9 CONDUCTIVE EFFECT—EARTH POTENTIAL RISE (EPR)	14
10 OTHER HAZARDS	15
11 INTERACTION BETWEEN PROTECTIVE EARTHING SYSTEMS ON PIPELINES AND CATHODIC PROTECTION SYSTEMS	17
12 COMMISSIONING AND MAINTENANCE OF PIPELINE EARTHING SYSTEMS	17
APPENDICES
A LIST OF REFERENCED DOCUMENTS	19
B DEFINITIONS	20
C LOAD CURRENT LFI EXAMPLE CALCULATION	22
D FAULT CURRENT LFI EXAMPLE CALCULATION	25
E EFFECTS OF A.C. TRACTION SYSTEM ON A NEARBY PIPELINE	34
F PIPELINE LOOP IMPEDANCE	39
G SAMPLE CALCULATION OF INTERCEPTED CAPACITIVE CURRENT	45
H EPR NEAR A HIGH VOLTAGE INSTALLATION	48
I MECHANICAL HANDLING OF PIPE LENGTHS	59
J INTERACTION OF CATHODIC PROTECTION SYSTEMS WITH PIPELINE PROTECTIVE EARTHING SYSTEMS	61
K BIBLIOGRAPHY	63

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