IEC TS 63042-302:2021

IEC TS 63042-302 ®
Edition 1.0 2021-10
TECHNICAL
SPECIFICATION
colour
inside
UHV AC transmission systems –
Part 302: Commissioning
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TS 63042-302 ®
Edition 1.0 2021-10
TECHNICAL
SPECIFICATION
colour
inside
UHV AC transmission systems –
Part 302: Commissioning
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01; 29.240.10 ISBN 978-2-8322-1024-6

– 2 – IEC TS 63042-302:2021  IEC 2021
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General . 9
4.1 Requirements . 9
4.2 Main purpose . 9
4.3 General structure of commissioning . 10
4.4 Scope of application . 10
4.5 Technical preparation of system commissioning . 10
5 Pre-commissioning . 11
5.1 General . 11
5.2 Combined test . 11
5.2.1 General . 11
5.2.2 Protection and control system test . 11
5.2.3 Instrument transformer test . 12
5.2.4 Switchgear and transformer test . 12
5.2.5 AC and DC power supply system test . 13
5.3 Communication system test . 13
6 System commissioning . 13
6.1 General . 13
6.2 Test requirements . 14
6.2.1 General . 14
6.2.2 Energizing test of no-load UHV power transformer . 14
6.2.3 Energizing test of tertiary connected reactor . 14
6.2.4 Energizing test of tertiary connected capacitor . 15
6.2.5 Energizing test of UHV busbar shunt reactor . 16
6.2.6 Energizing test of UHV busbar . 16
6.2.7 Energizing test of no-load UHV transmission line . 17
6.2.8 Loop closing (interconnecting)/opening (splitting) test . 18
7 Measurement in system commissioning . 19
7.1 General . 19
7.2 Measurement requirements . 19
7.2.1 General . 19
7.2.2 Transient voltage and current measurement . 19
7.2.3 Electric quantity measurement . 20
7.2.4 Relay protection measurement . 20
7.2.5 Harmonic measurement . 20
7.2.6 Sound level measurement of power transformer/shunt reactor . 20
7.2.7 Vibration measurement . 21
7.2.8 DGA of power transformer/shunt reactor . 21
7.2.9 Temperature measurement . 21
7.2.10 Power frequency electric and magnetic field measurement of substation
and transmission line . 22
7.2.11 Audible noise measurement of substation and transmission line . 22

7.2.12 Radio interference measurement of transmission line . 22
7.2.13 Partial discharge monitoring in GIS/power transformer . 22
Annex A (informative) Commissioning experiences in China . 23
A.1 General . 23
A.2 Overview. 23
A.3 Regulations . 23
A.4 Pre-commissioning . 23
A.5 System commissioning . 26
A.5.1 General . 26
A.5.2 Technical preparations . 26
A.5.3 Confirmation on preconditions for on-site commissioning . 27
A.5.4 System commissioning tests . 27
A.6 Measurement in system commissioning . 35
A.6.1 General . 35
A.6.2 Measurement in system commissioning . 36
Annex B (informative) Commissioning experiences in Japan . 39
B.1 Overview. 39
B.2 Regulations . 39
B.3 Pre-commissioning in Japan . 39
B.3.1 General . 39
B.3.2 Combined test . 40
B.3.3 Communication system test . 41
B.4 System commissioning in Japan . 42
B.4.1 General . 42
B.4.2 Energizing test. 42
B.5 Measurement in system commissioning in Japan . 43
B.5.1 General . 43
B.5.2 Measurement in system commissioning . 44
Annex C (informative) Commissioning experiences in India . 51
C.1 Overview. 51
C.2 Design, testing, installation, transportation and construction . 52
C.3 On-site acceptance tests . 53
C.3.1 General . 53
C.3.2 1 200/400 kV, 333 MVA single phase transformers . 53
C.3.3 1 200 kV dead tank spring-spring type SF6 circuit-breakers . 53
C.3.4 1 200 kV double break centre rotating and knee type disconnector . 54
C.3.5 1 200 kV capacitive voltage transformers . 54
C.3.6 850 kV surge arrestors . 54
C.4 Commissioning . 54
Bibliography . 56

Figure 1 – General structure of on-site acceptance tests and commissioning . 10
Figure A.1 – Circuit for test of UHV transformer with current increasing from zero . 31
Figure A.2 – Circuit for test of UHV transformer with voltage increasing from zero . 32
Figure A.3 – Circuit for loop closing (interconnecting)/opening (splitting) test operated
by UHV transmission line circuit breakers . 34
Figure B.1 – Circuit for transient voltage and current measurement . 44

– 4 – IEC TS 63042-302:2021  IEC 2021
Figure B.2 – Analysis results of electrostatic induced field in the vicinity of bushing
above the ground . 47
Figure B.3 – Electrostatic induction field intensity distribution . 47
Figure C.1 – Basic set-up at Bina 1 200 kV National Test Station . 52
Figure C.2 – Typical variation in voltage over the period of 4 days at Bina 1 200 kV

National Test Station . 55

Table 1 – Scope of application . 10
Table 2 – Recommended test items of pre-commissioning . 11
Table 3 – Recommended test items of system commissioning . 13
Table 4 – Recommended measurement items of system commissioning . 19
Table 5 – DGA of UHV transformer, UHV reactor and neutral point reactor . 21
Table A.1 – Test items for pre-commissioning of UHV AC transmission projects . 24
Table A.2 – System commissioning tests for UHV AC transmission projects . 28
Table A.3 – Measurement items in system commissioning for UHV AC transmission
projects . 35
Table B.1 – Pre-commissioning items . 39
Table B.2 – System commissioning items . 42
Table B.3 – Measurement items in system commissioning . 44

UHV AC TRANSMISSION SYSTEMS –
Part 302: Commissioning
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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication should be clearly indicated
in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability should attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC should not be held responsible for identifying any or all such patent rights.
IEC TS 63042-302 has been prepared by IEC technical committee 122: UHV AC transmission
systems. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
DTS Report on voting
122/115/DTS 122/117/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 63042 series, published under the general title UHV AC
transmission systems, can be found on the IEC website.

– 6 – IEC TS 63042-302:2021  IEC 2021
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

INTRODUCTION
Due to the increase in voltage level and transmission capacity, the reliability and security of
high voltage electric equipment and power system are facing new challenges. There is a need
to have consensus on a series of technical criteria and requirements for commissioning tests
for ultra-high voltage (UHV) AC transmission systems to check the proper and expected
performance of substation equipment and transmission lines, to verify the function of the
transmission system, to obtain the electromagnetic data and confirm the environmental
impacts complying with relevant local regulations. By commissioning, the integrated
performance and construction quality of the project before its commercial operation could be
confirmed.
This document proposes relevant test items, test preconditions, test methods, and test
acceptance criteria for pre-commissioning, system commissioning, and measurement during
system commissioning.
– 8 – IEC TS 63042-302:2021  IEC 2021
UHV AC TRANSMISSION SYSTEMS –
Part 302: Commissioning
1 Scope
This part of IEC 63042 applies to the commissioning of UHV AC transmission systems.
It mainly specifies the test purposes, test items, test preconditions, test methods and test
acceptance criteria during pre-commissioning and system commissioning. Also, the
measurement requirements for system commissioning are specified.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60076-6:2007, Power transformers – Part 6: Reactors
IEC 60076-10:2016, Power transformers – Part 10: Determination of sound levels
IEC 60076-10:2016/AMD1:2020
IEC 61000-4-13:2002, Electromagnetic compatibility (EMC) – Part 4-13: Testing and
measurement techniques – Harmonics and interharmonics including mains signalling at a.c.
power port, low frequency immunity tests
IEC 61000-4-13:2002/AMD1:2009
IEC 61000-4-13:2002/AMD2:2015
IEC 61786-2:2014, Measurement of DC magnetic, AC magnetic and AC electric fields from 1
Hz to 100 kHz with regard to exposure of human beings – Part 2: Basic standards for
measurements
IEC TS 63042-301:2018, UHV AC transmission systems – Part 301: On-site acceptance tests
CISPR TR 18-2:2017, Radio interference characteristics of overhead power lines and
high-voltage equipment – Part 2: Methods of measurement and procedure for determining
limits
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

3.1
commissioning
tests and measurements performed to verify the quality of equipment installation and verify
the system in an appropriate state before a transmission project being put into commercial
operation, consisting of two parts of pre-commissioning and system commissioning
3.2
pre-commissioning
series of tests and measurements performed in a substation before system commissioning of
a transmission project
Note 1 to entry: The tests include combined tests and communication tests to further assess the condition of
equipment after installation and on-site acceptance test for a transmission project.
3.3
system commissioning
series of tests and measurements performed (or checked) for the equipment and the power
system in the operating power grid after pre-commissioning
Note 1 to entry: The tests and measurements are implemented after completing on-site acceptance test and pre-
commissioning test, in order to ensure the project fulfils the requirements of commercial operation.
3.4
loop closing
loop interconnecting
operation performed by closing circuit-breaker of transmission line or transformer to make the
power grid of same or different voltage levels run in loop (synchronous interconnection)
network
Note 1 to entry: The purpose of the test is to verify the correctness of the synchronous strategy set for the tested
circuit-breakers, and to ensure security when the power grid is loop closed (interconnected).
3.5
loop opening
loop splitting
operation performed by opening circuit-breaker of transmission line or transformer to make
the power grid of same or different voltage levels run out of loop (synchronous
interconnection) network
Note 1 to entry: The purpose of the test is to verify the security when the power grid is loop opened (split).
4 General
4.1 Requirements
The overall requirements including main purpose, general method, scope of application, and
technical preparation for UHV AC system commissioning are as follows in 4.2 to 4.5 to secure
objectivity and transparency for evaluation and judgment of commissioning and to follow the
regulation of each country for safety and environmental security.
4.2 Main purpose
Commissioning is performed to confirm the integrated performance capability and
construction quality of the project before its commercial operation. The utilities should carry
out commissioning tests for UHV equipment and system-oriented aspects before the operation.
The purposes are as follows:
• to confirm the proper and expected performance of substation equipment and transmission
lines;
• to verify the function of the transmission system;

– 10 – IEC TS 63042-302:2021  IEC 2021
• to obtain the data such as electromagnetic field, sound level, etc., and to confirm the
environmental impacts complying with relevant local regulations.
4.3 General structure of commissioning
The general structure of on-site acceptance tests and commissioning is shown in Figure 1, to
confirm the soundness of every equipment and transmission line, the communication test
between protection, control, information equipment and control centre, and also the function
of the power grid. The commissioning consists of pre-commissioning and system
commissioning. Details of pre-commissioning and system commissioning are shown in Clause
5 and Clause 6 respectively.
Figure 1 – General structure of on-site acceptance tests and commissioning
4.4 Scope of application
The scope of the application is shown in Table 1.
Table 1 – Scope of application
IEC documents Each Combined Communication Energizing Interconnecting
test test test test test
IEC TS 63042-301
UHV AC transmission systems –
Applied - - - -
Part 301: On-site acceptance
tests
IEC TS 63042-302
- Applied Applied Applied Applied
UHV AC transmission systems –
Part 302: Commissioning
4.5 Technical preparation of system commissioning
With regard to the newly constructed UHV AC substations and transmission lines, simulation
analysis should be carried out, as the necessary technical basis for evaluating the risks and
ensuring the security and availability of system commissioning tests based on the practical
conditions of equipment and nearby power grid including transmission lines.

The simulation analysis consists of two parts, power flow and stability analysis, and
electromagnetic transient analysis. The power flow and stability simulation analysis focuses
on power grid operation mode, power flow arrangement, fault current, voltage fluctuation,
system stability performance during a disturbance, and security control measures. The
electromagnetic transient analysis focuses on overvoltage and overcurrent for each
commissioning test, and technical measures to ensure the security of equipment and system.
Commissioning program should be prepared prior to on-site implementation, which should
specify the test purposes, test contents, test and measurement procedures, and on-site
security measures, etc. The commissioning program should be compiled based on the
simulation results, the practical connection wirings of the commissioned substations, and the
characteristics of commissioned equipment and transmission lines.
5 Pre-commissioning
5.1 General
The conditions of pre-commissioning for UHV AC projects are as follows:
• the installation of equipment has been completed, and on-site acceptance tests are
completed;
• the network connection of the protection and control system and the communication
system in the station has been completed;
• the AC and DC power supply in the station has been installed and tested.
The test items and requirements of pre-commissioning for UHV AC projects should be
specified and selected by utilities based on their regulations and design.
The recommended test items of pre-commissioning are listed in Table 2.
Table 2 – Recommended test items of pre-commissioning
Test items
Protection and control system test
Instrument transformer test
Combined test
Switchgear and transformer test
AC and DC power supply system test
Monitoring and control system test
Communication system test
Protection and fault information system test

5.2 Combined test
5.2.1 General
The requirements for each combined test item should be specified.
5.2.2 Protection and control system test
The test contents and method of the protection and control system test are as follows:
• check the insulation of the secondary circuit and panel with a megohmmeter;
• check the signal of the protection and control system. The input/output binary signal is
simulated one by one in each protection and control device and then checked at the
receiving end (measuring and controlling device, control and monitoring system, or related
equipment);
– 12 – IEC TS 63042-302:2021  IEC 2021
• check the protection and tripping function. The tripping logic of each protection device is
tested one by one. Simulate all kinds of faults in each protection to make it trip, check and
confirm the correctness of the tripping function between protection and circuit-breaker, the
linkage logic between protections such as line protection and circuit-breaker failure
protection, busbar protection and circuit-breaker failure protection;
• carry out an end-to-end test. For pilot protection or differential protection, check the
sampling value, differential current, input and output contacts, remote signal, and
telemetry of the protection devices on both sides, and simulate various faults to verify the
logic of pilot or differential protection. Check whether the optical power, bit error rate,
attenuation, and channel coding of the channel meet the requirements.
5.2.3 Instrument transformer test
Instrument transformers include current transformer (CT) and voltage transformer (VT). The
test contents and method of instrument transformer test are as follows:
• check the insulation of CT and VT secondary circuit insulation with a megohmmeter;
• check the DC resistance of the CT secondary circuit. The balance bridge method or
secondary injection method can be applied;
• check and confirm that the polarity of the instrument transformer is in accordance with the
design drawings. It could be conducted in the CT primary injection test and VT energizing
test;
• check the AC load resistance of the secondary circuit of the instrument transformer.
Secondary current and voltage injection method could be applied;
• inject current into the primary system of the CT and check the phase sequence, polarity,
and ratio of the current transformer, and the correctness of the display values of
protection, measurement, metering, and other related equipment;
• energize the voltage transformer from primary or secondary, check the ratio of voltage
transformer, and the correctness of the voltage display value of protection, measurement,
metering, and other related equipment.
5.2.4 Switchgear and transformer test
Switchgear includes circuit-breaker, disconnector, and earthing switch. The test contents and
method of switchgear and transformer test are as follows:
• under each redundant operating power supply, verify the correctness of local/remote
tripping and closing operation of the circuit-breaker, and on-load tap changer (OLTC)
remote operation of the transformer;
• simulate simultaneous opening and closing operations to verify the anti-pumping function
of the circuit-breaker;
• check and confirm that the current of the opening and closing circuit of the circuit-breaker
meets the requirements;
• check and confirm that the low SF gas pressure locking functions of the circuit-breaker
work correctly;
• for synchronous closing of the circuit-breaker, when the synchronous conditions are
satisfied or not, the closing operation is carried out separately to verify the correctness of
the synchronous function;
• for each circuit-breaker, related disconnectors, and related earthing switches, and for
circuit-breaker and high-speed earthing switch (HSES) for secondary arc extinction, when
the interlocking condition is satisfied or not, the interlocking operation is carried out
separately to verify whether the interlocking function is correct. For the details of the
interlock between circuit-breaker and high-speed earthing switch see Annex B.

5.2.5 AC and DC power supply system test
AC and DC power supply system refers to the auxiliary power supply of substations. The test
contents and method of the AC and DC power supply system test are as follows:
• check insulation resistance of power source busbar and cable to ground;
• the functions of DC system switching, DC insulation monitoring, DC feeder power off,
standby self-switching, accident lighting, UPS, control and protection interface should be
tested and verified.
5.3 Communication system test
In the communication system test, the communication of all automation and protection
systems should be tested. The test contents and method of the communication test are as
follows:
• check the binary and analogue signals of each substation equipment, protection and
control system, circuit-breaker, disconnector, and earthing switch, and verify the remote
control operation;
• collect and record fault waveform, protection actions, and signals for protection and fault
information system, which is connected with digital fault recorders and protection devices.
Check the signals. Test the communication with the substation and the master station of
the protection and fault information system;
• check the insulation of secondary circuit for other monitoring and/or control systems, such
as digital fault recorder, fault location system, stability control system, synchronous
phasor measurement system, time synchronization system, metering system, on-line
condition monitoring system. Check the binary and analogue signals, verify the functions
of each system, and test the communication with the master station and/or substation.
NOTE Some of the monitoring and/or control system tests mentioned above are described in Clause A.4.
6 System commissioning
6.1 General
The recommended test items of system commissioning are listed in Table 3, but no sequence
is defined.
Table 3 – Recommended test items of system commissioning
Test items
Energizing test of no-load UHV power transformer
Energizing test of tertiary connected reactor
Energizing test of tertiary connected capacitor
Energizing test
Energizing test of UHV busbar shunt reactor
Energizing test of UHV busbar
Energizing test of no-load UHV transmission line
Interconnecting test Loop closing (interconnecting)/opening (splitting) test

The test items and requirements of system commissioning for UHV AC projects should be
specified and selected by utilities based on their own regulations and design.
For newly designed and constructed transmission lines, more information for system
commissioning test is given in Annex A to Annex C.

– 14 – IEC TS 63042-302:2021  IEC 2021
6.2 Test requirements
6.2.1 General
The requirements on preconditions, methods and acceptance criteria for each test item of
system commissioning should be specified as described in the following subclauses.
6.2.2 Energizing test of no-load UHV power transformer
6.2.2.1 Test preconditions
The test preconditions for energizing test of no-load UHV power transformers are as follows:
• the tap changer of UHV power transformer should be adjusted according to the
requirements of commissioning program;
• substation voltage should be controlled according to the requirements of power grid
operation of utilities based on simulation analysis;
• relay protection should be in function, and the value should be set according to the
requirements of utilities. It should be avoided to operate the equipment without main
protection during the test;
• before the first switching of UHV power transformer or after measuring the winding DC
resistor, the demagnetization should be completed before energizing the power
transformer.
6.2.2.2 Test methods
The test methods for energizing test of no-load UHV power transformers are as follows:
• the energizing test of no-load UHV power transformer should be carried out with circuit-
breaker on the primary side or secondary side of the transformer;
• the continuous running time after the first charging, the running time for each energizing
and the interval time for each switching should meet the requirements of utilities.
6.2.2.3 Test acceptance criteria
The test acceptance criteria for energizing test of no-load UHV power transformers are as
follows:
• the performance of UHV power transformers should be consistent with their available
factory and on-site acceptance tests, for details see IEC TS 63042-301;
• overvoltage and inrush current during switching UHV power transformers should meet
design requirements;
• relay protection behavior and signals should be correct for UHV power transformers and
circuit-breakers;
• phase signals of secondary voltage should be correct for VT on primary and secondary
side of UHV power transformers.
6.2.3 Energizing test of tertiary connected reactor
6.2.3.1 Test preconditions
The test preconditions for energizing test of tertiary connected reactors are as follows:
• substation voltage should be controlled according to the requirements of power grid
operation of utilities based on simulation analysis;
• relay protection should be in function, and the value should be set according to the
requirements of utilities. It should be avoided to operate the equipment without main
protection during the test.
6.2.3.2 Test methods
The test methods for energizing test of tertiary connected reactors are as follows:
• the switching times for each group of tertiary connected reactor during the whole
commissioning period should meet the requirements of utilities;
• the running time after the first energizing should meet the requirements of utilities;
• the running time after each energizing and the interval time for each switching should
meet the requirements of utilities.
6.2.3.3 Test acceptance criteria
The test acceptance criteria for energizing test of tertiary connected reactors are as follows:
• the performance should be compared to the available factory and on-site acceptance tests
results of tertiary connected reactors;
• overvoltage during switching tertiary connected reactors should meet design requirements;
• voltage fluctuation should be consistent with simulation analysis;
• relay protection behavior and signals should be correct for tertiary connected reactors,
circuit-breakers and busbars;
• phase signals should be correct for tertiary connected reactors VT secondary voltage;
• temperature of the equipment should be at normal level.
6.2.4 Energizing test of tertiary connected capacitor
6.2.4.1 Test preconditions
The test preconditions for energizing test of tertiary connected capacitors are as follows:
• substation voltage should be controlled according to the requirements of power grid
operation of utilities based on simulation analysis;
• relay protection should be in function, and the setting value should be set according to the
requirements of utilities. It should be avoided to operate the equipment without main
protection during the test.
6.2.4.2 Test methods
The test methods for energizing test of tertiary connected capacitors are as follows:
• the switching times for each group of tertiary connected capacitor during the whole
commissioning period should meet the requirements of utilities;
• the running time after the first energizing should meet the requirements of utilities;
• the running time after each energizing and the interval time for each switching should
meet the requirements of utilities.
6.2.4.3 Test acceptance criteria
The test acceptance criteria for energizing test of tertiary connected capacitors are as follows:
• the performance should be compared to the available factory and on-site acceptance tests
results of tertiary connected capacitors;
• overvoltage during switching tertiary connected capacitors should meet design
requirements;
• voltage fluctuation of tertiary side busbar should be consistent with simulation analysis;
• current and unbalanced current of tertiary connected capacitors should be consistent with
design requirement;
– 16 – IEC TS 63042-302:2021  IEC 2021
• relay protection behavior and signals should be correct for tertiary connected capacitors,
circuit-breakers and busbars.
6.2.5 Energizing test of UHV busbar shunt reactor
6.2.5.1 Test preconditions
The test preconditions for energizing test of UHV busbar shunt reactors are as follows:
• substation voltage should be controlled according to the requirements of power grid
operation of utilities based on simulation analysis;
• relay protection should be in function, and the setting value should be set according to the
requirements of utilities. It should be avoided to operate the equipment without main
protection during the test.
6.2.5.2 Test methods
The test methods for energizing test of UHV busbar shunt reactors are as follows:
• high voltage reactor energizing test should be carried out with UHV circuit breaker;
• when UHV shunt reactor is installed on substation busbar, the switching times for reactor
during the whole commissioning period should meet the requirements of utilities;
• the continuous running time after the first energizing should meet the requirements of
utilities;
• the running time of each energizing and the interval time for each switching should meet
the requirements of utilities.
6.2.5.3 Test acceptance criteria
The test acceptance criteria for energizing test of UHV busbar shunt reactors are as follows:
• the performance should be consistent with available factory and on-site acceptance tests
results of UHV shunt reactors, for details see IEC TS 63042-301;
• overvoltage during switching UHV busbar shunt reactors should meet design
requirements;
• relay protection behavior and signals
...