IEC TR 63042-303:2021

IEC TR 63042-303 ®
Edition 1.0 2021-04
TECHNICAL
REPORT
UHV AC transmission systems –
Part 303: Guideline for the measurement of UHV AC transmission line power
frequency parameters
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IEC TR 63042-303 ®
Edition 1.0 2021-04
TECHNICAL
REPORT
UHV AC transmission systems –
Part 303: Guideline for the measurement of UHV AC transmission line power

frequency parameters
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.20 ISBN 978-2-8322-9646-2

– 2 – IEC TR 63042-303:2021 © IEC 2021
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General . 9
4.1 Background. 9
4.2 Measurement items . 9
4.3 Main circuit configuration . 10
4.4 Measurement condition . 10
5 Requirement of measuring instrument . 10
5.1 Current transformer. 10
5.2 Voltage transformer . 10
5.3 Measuring instrument of DC resistance . 10
5.4 Offset frequency power source . 11
5.5 Special measuring instrument of transmission line power frequency
parameter . 11
6 Conversion of offset frequency measurement results . 11
7 Measurement of induced voltage and induced current . 12
7.1 General . 12
7.2 Induced voltage . 12
7.3 Induced current . 13
8 Phase verification and measurement of insulation resistance . 13
8.1 General . 13
8.2 Phase verification . 13
8.3 Measurement of insulation resistance . 14
9 Measurement of DC resistance . 14
10 Measurement of positive-sequence parameter . 15
11 Measurement of zero-sequence parameter . 17
12 Measurement of mutual impedance and coupling capacitance between double-
circuit transmission lines on the same tower . 19
12.1 General . 19
12.2 Measurement of line-mode impedance . 20
12.3 Measurement of line-mode capacitance . 20
12.4 Measurement of ground-mode impedance . 20
12.5 Measurement of ground-mode capacitance . 21
12.6 Data process . 21
13 Measurement of phase parameters . 22
13.1 Measurement of self-impedance . 22
13.2 Measurement of self-capacitance . 23
13.3 Measurement of coupling capacitance between two phases . 24
13.4 Measurement of mutual impedance between two phases . 25
Annex A (informative) Example of transmission line power frequency parameter
measurement . 28
A.1 Introduction of transmission line . 28
A.2 Measurement of positive-sequence parameter . 28

A.2.1 Measured data . 28
A.2.2 Calculation results . 28
A.3 Measurement of zero-sequence parameter . 29
A.3.1 Measured data . 29
A.3.2 Calculation results . 29
A.4 Measurement of phase parameter . 29
A.4.1 General . 29
A.4.2 Capacitance matrix . 30
A.4.3 Impedance matrix . 30
Annex B (informative) Derivation process of measurement and calculation for
coupling capacitance between two phases . 31
Annex C (informative) Safety precautions . 34
Bibliography . 35
Figure 1 – Measurement of induced voltage . 12
Figure 2 – Measurement of induced voltage . 13
Figure 3 – Measurement of induced current . 13
Figure 4 – Phase verification . 14
Figure 5 – Measurement of insulation resistance . 14
Figure 6 – Measurement of DC resistance . 15
Figure 7 – Measurement of positive-sequence parameter . 16
Figure 8 – Measurement of zero-sequence parameter . 18
Figure 9 – Measurement of line-mode impedance . 20
Figure 10 – Measurement of line-mode capacitance . 20
Figure 11 – Measurement of ground-mode impedance . 21
Figure 12 – Measurement of ground-mode capacitance . 21
Figure 13 – Measurement of self-impedance by two-terminal synchronous

measurement method . 22
Figure 14 – Measurement of self-capacitance by two-terminal synchronous
measurement method . 23
Figure 15 – Measurement of coupling capacitance between two phases . 24
Figure 16 – Measurement of mutual impedance between two phases . 26
Figure B.1 – The π-equivalent circuit of 3-phase system during measurement . 31
Table 1 – Calculation method of positive-sequence parameters . 17
Table 2 – The calculation method of zero-sequence parameters . 18
Table 3 – Calculation process and equations of parameters per unit length of double-
circuit lines on the same tower . 22
Table 4 – The calculation of self-impedance . 23
Table 5 – The calculation of self-capacitance . 24
Table A.1 – Measured data of transmission line I . 28
Table A.2 – Positive-sequence parameters of transmission line I . 28
Table A.3 – DC resistance of line I . 29
Table A.4 – Measured data of transmission line I . 29
Table A.5 – Zero-sequence parameters of transmission line I . 29

– 4 – IEC TR 63042-303:2021 © IEC 2021
Table A.6 – The capacitance matrix of transmission line I and II . 30
Table A.7 – The resistance matrix of transmission line I and II . 30
Table A.8 – The reactance matrix of transmission line I and II . 30

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UHV AC TRANSMISSION SYSTEMS –
Part 303: Guideline for the measurement of UHV AC
transmission line power frequency parameters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technic
...