CISPR TR 18-3:2017

CISPR TR 18-3 ®
Edition 3.0 2017-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Radio interference characteristics of overhead power lines and high-voltage
equipment –
Part 3: Code of practice for minimizing the generation of radio noise

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CISPR TR 18-3 ®
Edition 3.0 2017-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

Radio interference characteristics of overhead power lines and high-voltage

equipment –
Part 3: Code of practice for minimizing the generation of radio noise

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.01 ISBN 978-2-8322-5000-6

– 2 – CISPR TR 18-3:2017 RLV  IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Practical design of overhead power lines and associated equipment in order to
control interference to radio broadcast sound and television reception . 9
4.1 Overview. 9
4.2 Corona on conductors . 9
4.3 Corona on metal hardware . 9
4.4 Surface discharges on insulators . 10
4.4.1 Clean or slightly polluted insulators . 10
4.4.2 Very polluted insulators . 10
4.5 Spark and microsparks due to bad contacts, commutation effects . 11
4.6 Defects on power lines and associated equipment in service . 11
5 Methods of prediction of the reference level of an overhead line . 11
5.1 General . 11
5.2 Correlation of data given elsewhere in this publication . 12
5.3 CIGRÉ formula. 13
5.4 Determination of 80 % level . 13
5.5 Conclusions . 14
6 Preventive and remedial measures to minimize radio noise generated by bad
contacts and their detection and location . 14
6.1 General . 14
6.2 Preventive and remedial measures . 14
6.3 Methods of detecting and locating bad contacts . 16
7 Formulae for predetermination of the radio noise field strength produced by large
conductor bundles (more than four sub-conductors) and by tubular conductors . 18
7.1 Basic principles . 18
7.2 Calculation of corona radio noise field strengths due to large bundles . 19
7.2.1 Procedure for the predetermination of the radio noise field strength . 19
7.2.2 Calculation of the excitation function in heavy rain . 20
7.2.3 Correction factor to evaluate the excitation function in other weather
categories . 20
7.2.4 Calculation of the radio noise field strength . 20
7.3 Evaluation of corona radio noise field strength due to large tubular
conductors . 21
8 Figures . 23
Bibliography . 52
Annex A (informative) Formulae for predicting the radio noise field strength from the
conductors of an overhead line . 31
A.1 CIGRÉ formula for general use . 31
A.2 Collation of predetermination formulae used by several institutions around
the world . 32
Annex B (informative) Configuration of an RF-based spark discharge detector and
Direction Of Arrival (DOA) estimation method . 43

B.2 Direction of Arrival (DOA) estimation method based on Time Difference of
Arrival (TDOA) [17] . 43
B.1 Configuration of RF-based spark discharge detector . 43
Annex C (informative) Analytical procedure for the predetermination of the radio
noise field strength, at a given distance from an overhead line with large bundle
conductors . 45
C.1 Analytical procedure . 45
C.2 Example of calculation of the radio noise field strength . 46

Figure 1 – Bundle conductors . 23
Figure 2 – Line with conductors in a flat configuration . 24
Figure 3 – Line with conductors in a delta configuration . 25
Figure 4 – Line with conductors in a triangular configuration . 26
Figure 5 – Line with conductors in a flat configuration . 27
Figure 6 – Line with conductors in a delta configuration . 28
Figure 7 – Line with conductors in a triangular configuration . 29
Figure 8 – Tubular conductors of 40 cm diameter. 30
Figure B.1 – Configuration of RF-based spark discharge detector [17] . 43
Figure B.2 – Coordinates and arrangement of the four-antenna-square array. 44
Figure C.1 – Designation of the geometrical quantities for the simplified analytical
method . 50
Figure C.2 – Lateral profiles of the radio noise field strengths produced by the
individual phases and of the total field, as calculated in the given example . 51

Table A.1 – Empirical methods, terms of the predetermination formulae developed by
several institutions, survey . 33
Table A.2 – Empirical methods, complete predetermination formulae developed by
several institutions, survey (1 of 2) . 35
Table A.3 – Predetermination formulae, examples for calculation of the absolute field
strength levels (1 of 2) . 37
Table A.4 – Empirical methods, complete predetermination formulae for DC lines
developed by several institutions, survey (1 of 2) . 39
Table A.5 – Formulae for calculation of the excitation function in fair weather for DC
lines developed by several institutions, survey . 41

– 4 – CISPR TR 18-3:2017 RLV  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
____________
RADIO INTERFERENCE CHARACTERISTICS
OF OVERHEAD POWER LINES
AND HIGH-VOLTAGE EQUIPMENT –
Part 3: Code of practice for minimizing
the generation of radio noise
FOREWORD
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