oSIST prEN IEC 61954:2021

Static var compensators (SVC) - Testing of thyristor valves

This International Standard defines type, production and optional tests on thyristor valves used in thyristor controlled reactors (TCR), thyristor switched reactors (TSR) and thyristor switched capacitors (TSC) forming part of static VAR compensators (SVC) for power system applications. The requirements of the standard apply both to single valve units (one phase) and to multiple valve units (several phases).
Clauses 4 to 7 detail the type tests, i.e. tests which are carried out to verify that the valve design meets the requirements specified. Clause 8 covers the production tests, i.e. tests which are carried out to verify proper manufacturing. Clauses 9 and 10 detail optional tests, i.e. tests additional to the type and production tests.

Statische Blindleistungskompensatoren (SVC) – Prüfung von Thyristorventilen

Compensateurs statiques de puissance réactive (SVC) - Essais des valves à thyristors

Statični kompenzatorji jalove energije (var) - Preskušanje tiristorskih elektronk

General Information

• Status: Not Published
• Public Enquiry End Date: 22-Apr-2021
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 31.080.20 - Thyristors
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Aug-2021
• Due Date: 27-Sep-2021
• Ref Project: FprEN IEC 61954:2021 - Static var compensators (SVC) - Testing of thyristor valves

RELATIONS

• Revised: SIST EN 61954:2011 - Static VAR compensators (SVC) - Testing of thyristor valves
• Effective Date: 08-Sep-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN IEC 61954:2021
01-april-2021

Statični kompenzatorji jalove energije (var) - Preskušanje tiristorskih elektronk

Static var compensators (SVC) - Testing of thyristor valves

Compensateurs statiques de puissance réactive (SVC) - Essais des valves à thyristors

Ta slovenski standard je istoveten z: prEN IEC 61954:2021
ICS:
29.240.99 Druga oprema v zvezi z Other equipment related to
omrežji za prenos in power transmission and
distribucijo električne energije distribution networks
31.080.20 Tiristorji Thyristors
oSIST prEN IEC 61954:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61954:2021
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oSIST prEN IEC 61954:2021
22F/608/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61954 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-02-05 2021-04-30
SUPERSEDES DOCUMENTS:
22F/589/CD, 22F/600/CC

IEC SC 22F : POWER ELECTRONICS FOR ELECTRICAL TRANSMISSION AND DISTRIBUTION SYSTEMS

SECRETARIAT: SECRETARY:
Russian Federation Mr Lev Travin
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 115
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which

they are aware and to provide supporting documentation.
TITLE:
Static var compensators (SVC) - Testing of thyristor valves
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:

As the plenary meeting of SC 22F was cancelled in 2020 due to COVID-19 pandemiс (see 22F/591/INF),

comments and proposals of National Committees on 22F/589/CD contained in 22F/600/CC were discussed by

correspondence by a group consisting of Mr. Huigao Zhou, the Chair of SC 22F, Mr. Lev Travin, SC 22F

secretary, Mr. Marcio de Oliveira, the convenor of SC 22F/MT 10 and MT 10 members.

The decision to develop the current CDV, based on the results of this discussion was taken by Mr. Huigao

Zhou, the Chair of SC 22F (supported by Mr. Lev Travin, SC 22F secretary).

Copyright © 2020 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee

positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose

without permission in writing from IEC.
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1 CONTENTS

2 CONTENTS ........................................................................................................................ - 2 -

3 FOREWORD ...................................................................................................................... - 5 -

4 1 Scope ......................................................................................................................... - 7 -

5 2 Normative references .................................................................................................. - 7 -

6 3 Terms and definitions .................................................................................................. - 7 -

7 4 General requirements for type, production and optional tests ...................................... - 9 -

8 4.1 Summary of tests ............................................................................................... - 9 -

9 4.2 Objectives of tests ............................................................................................ - 10 -

10 4.2.1 General ..................................................................................................... - 10 -

11 4.2.2 Dielectric tests .......................................................................................... - 10 -

12 4.2.3 Operational tests ....................................................................................... - 10 -

13 4.2.4 Electromagnetic interference tests ............................................................ - 11 -

14 4.2.5 Production tests ........................................................................................ - 11 -

15 4.2.6 Optional tests ............................................................................................ - 11 -

16 4.3 Guidelines for the performance of type and optional tests ................................. - 11 -

17 4.4 Test conditions ................................................................................................. - 11 -

18 4.4.1 General ..................................................................................................... - 11 -

19 4.4.2 Valve temperature at testing...................................................................... - 13 -

20 4.4.3 Redundant thyristor levels ......................................................................... - 13 -

21 4.5 Permissible component failures during type testing .......................................... - 14 -

22 4.6 Documentation of test results ........................................................................... - 14 -

23 4.6.1 Test reports to be issued ........................................................................... - 14 -

24 4.6.2 Contents of a type test report .................................................................... - 14 -

25 5 Type tests on TCR and TSR valves ........................................................................... - 15 -

26 5.1 Dielectric tests between valve terminals and earth ........................................... - 15 -

27 5.1.1 General ..................................................................................................... - 15 -

28 5.1.2 AC test ...................................................................................................... - 15 -

29 5.1.3 Lightning impulse test ............................................................................... - 16 -

30 5.2 Dielectric tests between valves (MVU only) ...................................................... - 16 -

31 5.2.1 General ..................................................................................................... - 16 -

32 5.2.2 AC test ...................................................................................................... - 17 -

33 5.2.3 Lightning impulse test ............................................................................... - 17 -

34 5.3 Dielectric tests between valve terminals ........................................................... - 18 -

35 5.3.1 General ..................................................................................................... - 18 -

36 5.3.2 AC test ...................................................................................................... - 18 -

37 5.3.3 Switching impulse test ............................................................................... - 19 -

38 5.4 Operational tests .............................................................................................. - 21 -

39 5.4.1 Periodic firing and extinction test ............................................................... - 21 -

40 5.4.2 Minimum a.c. voltage test .......................................................................... - 22 -

41 5.4.3 Temperature rise test ................................................................................ - 23 -

42 6 Type tests on TSC valves.......................................................................................... - 23 -

43 6.1 Dielectric tests between valve terminals and earth ........................................... - 23 -

44 6.1.1 General ..................................................................................................... - 23 -

45 6.1.2 AC-DC test ................................................................................................ - 23 -

46 6.1.3 Lightning impulse test ............................................................................... - 25 -

47 6.2 Dielectric tests between valves (for MVU only) ................................................. - 26 -

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48 6.2.1 General ..................................................................................................... - 26 -

49 6.2.2 AC-DC test ................................................................................................ - 26 -

50 6.2.3 Lightning impulse test ............................................................................... - 28 -

51 6.3 Dielectric tests between valve terminals ........................................................... - 28 -

52 6.3.1 General ..................................................................................................... - 28 -

53 6.3.2 AC-DC test ................................................................................................ - 28 -

54 6.3.3 Switching impulse test ............................................................................... - 30 -

55 6.4 Operational tests .............................................................................................. - 31 -

56 6.4.1 Overcurrent tests ...................................................................................... - 31 -

57 6.4.2 Minimum a.c. voltage test .......................................................................... - 34 -

58 6.4.3 Temperature rise test ................................................................................ - 35 -

59 7 Electromagnetic interference tests ............................................................................ - 35 -

60 7.1 Objectives ........................................................................................................ - 35 -

61 7.2 Test procedures ............................................................................................... - 35 -

62 7.2.1 General ..................................................................................................... - 35 -

63 7.2.2 Switching impulse test ............................................................................... - 36 -

64 7.2.3 Non-periodic firing test .............................................................................. - 36 -

65 8 Production tests ........................................................................................................ - 36 -

66 8.1 General ............................................................................................................ - 36 -

67 8.2 Visual inspection .............................................................................................. - 36 -

68 8.3 Connection check ............................................................................................. - 36 -

69 8.4 Voltage-dividing/damping circuit check ............................................................. - 37 -

70 8.5 Voltage withstand check ................................................................................... - 37 -

71 8.6 Check of auxiliaries .......................................................................................... - 37 -

72 8.7 Firing check ...................................................................................................... - 37 -

73 8.8 Cooling system pressure test............................................................................ - 37 -

74 8.9 Partial discharge tests ...................................................................................... - 37 -

75 9 Optional tests on TCR and TSR valves ..................................................................... - 37 -

76 9.1 Overcurrent test ............................................................................................... - 37 -

77 9.1.1 Overcurrent with subsequent blocking ....................................................... - 37 -

78 9.1.2 Overcurrent without blocking ..................................................................... - 38 -

79 9.2 Positive voltage transient during recovery test .................................................. - 38 -

80 9.2.1 Objectives ................................................................................................. - 38 -

81 9.2.2 Test values and waveshapes..................................................................... - 38 -

82 9.2.3 Test procedures ........................................................................................ - 39 -

83 9.3 Non-periodic firing test ..................................................................................... - 39 -

84 9.3.1 Objectives ................................................................................................. - 39 -

85 9.3.2 Test values and waveshapes..................................................................... - 39 -

86 9.3.3 Test procedures ........................................................................................ - 41 -

87 10 Optional tests on TSC valves .................................................................................... - 41 -

88 10.1 Positive voltage transient during recovery test .................................................. - 41 -

89 10.1.1 Test objective ............................................................................................ - 41 -

90 10.1.2 Test values and waveshapes..................................................................... - 41 -

91 10.1.3 Test procedures ........................................................................................ - 41 -

92 10.2 Non-periodic firing test ..................................................................................... - 42 -

93 10.2.1 Objectives ................................................................................................. - 42 -

94 10.2.2 Test values and waveshapes..................................................................... - 42 -

95 10.2.3 Test procedures ........................................................................................ - 43 -

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97 Figure 1 – TSC branch ..................................................................................................... - 32 -

98 Figure 2 – One-loop overcurrent ....................................................................................... - 33 -

99 Figure 3 – Two-loop overcurrent ....................................................................................... - 34 -

100

101 Table 1 – List of tests ......................................................................................................... - 9 -

102 Table 2 – Number of thyristor levels permitted to fail during type tests ............................. - 14 -

103
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104 INTERNATIONAL ELECTROTECHNICAL COMMISSION
105
106 ____________
107
108 STATIC VAR COMPENSATORS (SVC) –
109 TESTING OF THYRISTOR VALVES
110
111 FOREWORD

112 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all

113 national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-

114 operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to

115 other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available

116 Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical

117 committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work.

118 International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation.

119 IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions

120 determined by agreement between the two organizations.

121 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

122 consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC

123 National Committees.

124 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in

125 that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC

126 cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.

127 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to

128 the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and

129 the corresponding national or regional publication shall be clearly indicated in the latter.

130 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment

131 services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by

132 independent certification bodies.

133 6) All users should ensure that they have the latest edition of this publication.

134 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of

135 its technical committees and IEC National Committees for any personal injury, property damage or other damage of any

136 nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the

137 publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

138 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

139 indispensable for the correct application of this publication.

140 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights.

141 IEC shall not be held responsible for identifying any or all such patent rights.

142 International Standard IEC 61954 has been prepared by subcommittee 22F: POWER ELECTRONICS

143 FOR ELECTRICAL TRANSMISSION AND DISTRIBUTION SYSTEMS, of IEC technical committee 22:

144 POWER ELECTRONIC SYSTEMS AND EQUIPMENT.

145 This third edition cancels and replaces the second edition published in 2011-04 [documents

146 22F/217/CDV and 22F/231A/RVC], Amendment 1:2013-04 [documents 22F/274/CDV and

147 22F/287A/RVC] and Amendment 2:2017-04 [documents 22F/409/CDV and 22F/418A/RVC]. The

148 technical content is identical to the base edition and its amendments This edition constitutes a

149 technical revision.

150 This edition includes the following significant technical changes with respect to the previous edition -

151 important clarifications were made in 4.4.1.2, 5.1.2.2, 5.1.3.2, 5.2.3.2, 6.1.3.2 and 9.3.2

152 The text of this International Standard is based on the following documents:
FDIS Report on voting
22F/XX/FDIS 22F/XX/RVD
153
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154 Full information on the voting for the approval of this International Standard can be found in the report

155 on voting indicated in the above table.

156 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

157 The committee has decided that the contents of this document will remain unchanged until the stability

158 date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific

159 document. At this date, the document will be
160 • reconfirmed,
161 • withdrawn,
162 • replaced by a revised edition, or
163 • amended.
164
165
166
167
168
169
170
171
172
173
174
175
176
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177 STATIC VAR COMPENSATORS (SVC) –
178 TESTING OF THYRISTOR VALVES
179
180
181
182 1 Scope

183 This International Standard defines type, production and optional tests on thyristor valves used in

184 thyristor controlled reactors (TCR), thyristor switched reactors (TSR) and thyristor switched capacitors

185 (TSC) forming part of static VAR compensators (SVC) for power system applications. The

186 requirements of the standard apply both to single valve units (one phase) and to multiple valve units

187 (several phases).

188 Clauses 4 to 7 detail the type tests, i.e. tests which are carried out to verify that the valve design

189 meets the requirements specified. Clause 8 covers the production tests, i.e. tests which are carried out

190 to verify proper manufacturing. Clauses 9 and 10 detail optional tests, i.e. tests additional to the type

191 and production tests.
192 2 Normative references

193 The following referenced documents are indispensable for the application of this document. For dated

194 references, only the edition cited applies. For undated references, the latest edition of the referenced

195 document (including any amendments) applies.
196 IEC 60060 (all parts), High-voltage test techniques

197 IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements

198 IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
199 IEC 60071 (all parts), Insulation co-ordination

200 IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules

201 IEC 60270, High-voltage test techniques – Partial discharge measurements

202 IEC 60700-1, Thyristor valves for high-voltage direct current (HVDC) power transmission – Part 1:

203 Electrical testing
204 3 Terms and definitions

205 For the purposes of this document, the following terms and definitions apply:

206 3.1
207 thyristor level

208 part of a thyristor valve comprising a thyristor, or thyristors connected in parallel or antiparallel,

209 together with their immediate auxiliaries and reactor, if any
210 3.2
211 thyristor (series) string
212 series connected thyristors forming one direction of a thyristor valve
213 3.3
214 valve reactor
215 reactor incorporated within some valves for limitation of stresses
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216 NOTE For testing purposes it is considered an integral part of the valve.
217 3.4
218 valve section

219 electrical assembly, comprising a number of thyristors and other components, which exhibits pro-rated

220 electrical properties of a complete thyristor valve but only a portion of the full voltage blocking

221 capability of the thyristor valve and which can be used for tests
222 3.5
223 thyristor valve

224 electrically and mechanically combined assembly of thyristor levels, complete with all connections,

225 auxiliary components and mechanical structures, which can be connected in series with each phase of

226 the reactor or capacitor of an SVC
227 3.6
228 valve structure

229 physical structure which insulates the valves to the appropriate level above earth potential and from

230 each other
231 3.7
232 valve base electronics
233 VBE

234 electronic unit, at earth potential, which is the interface between the control system of the SVC and the

235 thyristor valves
236 3.8
237 multiple valve unit
238 MVU

239 assembly of several valves in the same physical structure which cannot be separated for test purposes

240 (e.g. three-phase valves)
241 3.9
242 redundant thyristor levels

243 the maximum number of thyristor levels in the thyristor valve that may be short-circuited, externally or

244 internally, during service without affecting the safe operation of the thyristor valve as demonstrated by

245 type tests; and which if and when exceeded, would require either the shutdown of the thyristor valve to

246 replace the failed thyristors, or the acceptance of increased risk of failures

247 3.10
248 voltage breakover (VBO) protection

249 means of protecting the thyristors from excessive voltage by firing them at a predetermined voltage

250
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251 4 General requirements for type, production and optional tests
252 4.1 Summary of tests
253 Table 1 lists the tests given in the following clauses and subclauses.
254 Table 1 – List of tests
Test Clause or subclause Test object
TCR/TSR TSC
Dielectric tests between valve terminals and earth (type tests)
AC test 5.1.2 Valve
AC-DC test 6.1.2 Valve
Lightning impulse test 5.1.3 6.1.3 Valve
Dielectric tests between valves (MVU only) (type tests)
AC test 5.2.2 MVU
AC-DC test 6.2.2 MVU
Lightning impulse test 5.2.3 6.2.3 MVU
Dielectric tests between valve terminals (type tests)
AC test 5.3.2 Valve
AC-DC test 6.3.2 Valve
Switching impulse test 5.3.3 6.3.3 Valve
Operational tests (type tests)
Periodic firing and extinction test 5.4.1 Valve or valve section
Overcurrent test 6.4.1 Valve or valve section
Minimum a.c. voltage test 5.4.2 6.4.2 Valve or valve section
Temperature rise test 5.4.3 6.4.3 Valve or valve section
Electromagnetic interference tests (type tests)
Switching impulse test 7.2.2 7.2.2 Valve
Non-periodic firing test 7.2.3 7.2.3 Valve
Production tests
Visual inspection 8.2 8.2
Connection check 8.3 8.3
Voltage dividing/damping circuit check 8.4 8.4
Voltage withstand check 8.5 8.5
Check of auxiliaries 8.6 8.6
Firing check 8.7 8.7
Cooling system pressure test 8.8 8.8
Partial discharge tests 8.9 8.9
Optional tests
Overcurrent test 9.1 Valve or valve section
Positive voltage transient during recovery test 9.2 10.1 Valve or valve section
Non-periodic firing test 9.3 10.2 Valve or valve section
255
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256 4.2 Objectives of tests
257 4.2.1 General

258 The tests described apply to the valve (or valve sections), the valve structure and those parts of the

259 coolant distribution system and firing and monitoring circuits which are contained within the valve

260 structure or connected between the valve structure and earth. Other equipment, such as valve control

261 and protection and valve base electronics may be essential for demonstrating the correct function of

262 the valve during the tests but are not in themselves the subject of the tests.

263 4.2.2 Dielectric tests
264 4.2.2.1 General
265 Tests for the following dielectric stresses are specified:
266 – a.c. voltage;
267 – combined a.c. and d.c. voltage (TSC only);
268 – impulse voltages.

269 In the interest of standardization with other equipment, lightning impulse tests between valve terminals

270 and earth and between phases of an MVU are included. For tests between valve terminals, the only

271 impulse test specified is a switching impulse.
272 4.2.2.2 Tests on valve structure

273 Tests are defined for the voltage withstand requirements between a valve (with its terminals short-

274 circuited) and earth, and also between valves for MVU. The tests shall demonstrate that

275 – sufficient clearances have been provided to prevent flashovers;

276 – there is no disruptive discharge in the insulation of the valve structure, cooling ducts, light guides

277 and other insulation parts of the pulse transmission and distribution systems;

278 – partial discharge inception and extinction voltages under a.c. and d.c. conditions are above the

279 maximum steady-state operating voltage appearing on the valve structure.
280 4.2.2.3 Tests between valve terminals

281 The purpose of these tests is to verify the design of the valve with respect to its capability to withstand

282 overvoltages between its terminals. The tests shall demonstrate that
283 – sufficient internal insulation has been provided to enable t
...