kSIST FprEN IEC 60358-1:2025
(Main)Coupling capacitors and capacitor dividers - Part 1: General rules
Coupling capacitors and capacitor dividers - Part 1: General rules
Kopplungskondensatoren und kapazitive Teiler - Teil 1: Allgemeine Bestimmungen
Condensateurs de couplage et diviseurs capacitifs - Partie 1: Règles générales
Sklopni kondenzatorji in kondenzatorski delilniki - 1. del: Splošna pravila
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60358-1:2025
01-april-2025
Sklopni kondenzatorji in kondenzatorski delilniki - 1. del: Splošna pravila
Coupling capacitors and capacitor dividers - Part 1: General rules
Kopplungskondensatoren und kapazitive Teiler - Teil 1: Allgemeine Bestimmungen
Condensateurs de couplage et diviseurs capacitifs - Partie 1: Règles générales
Ta slovenski standard je istoveten z: prEN IEC 60358-1:2025
ICS:
31.060.70 Močnostni kondenzatorji Power capacitors
oSIST prEN IEC 60358-1:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 60358-1:2025
oSIST prEN IEC 60358-1:2025
33/718/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60358-1 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-07 2025-05-02
SUPERSEDES DOCUMENTS:
33/711/CD, 33/714A/CC
IEC TC 33 : POWER CAPACITORS AND THEIR APPLICATIONS
SECRETARIAT: SECRETARY:
Italy Mr Stefano Zunino
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
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.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Coupling capacitors and capacitor dividers - Part 1: General rules
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
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 permis sion
in writing from IEC.
oSIST prEN IEC 60358-1:2025
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1 CONTENTS
2 FOREWORD . 6
3 INTRODUCTION . 8
4 1 Scope . 10
5 2 Normative references . 10
6 3 Terms, definitions, symbols and abbreviated terms . 11
7 General . 12
8 Coupling capacitor and capacitor divider specifics . 15
9 4 Normal and special environmental conditions . 16
10 General . 16
11 Normal service conditions . 17
12 Ambient air temperature . 17
13 Altitude . 17
14 Vibrations or earthquakes . 17
15 Other service conditions for indoor equipment . 17
16 Other service conditions for outdoor equipment . 17
17 Special service conditions . 18
18 General . 18
19 Altitude . 18
20 Ambient temperature . 19
21 Earthquakes . 19
22 System earthing . 19
23 5 Ratings . 20
24 Standard values of rated frequency . 20
25 Standard values of rated voltages . 20
26 Rated voltage U for AC . 20
r
27 Rated voltage U for DC . 20
r
28 Standard values of rated voltage factor . 21
29 Standard values of rated voltage factor for AC voltages . 21
30 Standard values of rated voltage factor for DC voltages . 21
31 6 Design requirements . 21
32 Insulation requirements . 21
33 Other insulation requirements . 23
34 Low voltage terminal not exposed to weather . 23
35 Low voltage terminal exposed to weather . 24
36 Partial discharges . 24
37 Chopped lightning impulse test . 24
38 Capacitance at power frequency . 24
39 Losses of the capacitor at power frequency . 25
40 External insulation requirements . 25
41 Electromagnetic emission requirements – Radio interference voltage (RIV) . 26
42 Mechanical requirements . 26
43 Tightness of equipment . 27
44 General . 27
45 Liquid tightness . 27
46 Gas tightness . 27
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47 Voltage grading for DC capacitors . 29
48 Requirements for temperature rise . 29
49 Capacitor element ageing requirements . 29
50 General . 29
51 Capacitor element design criteria . 30
52 Marking of the equipment . 30
53 General . 30
54 Markings of the rating plate . 31
55 7 Tests . 31
56 General . 31
57 Classification of tests . 32
58 General . 32
59 Routine tests . 33
60 Type tests . 33
61 Special tests . 34
62 Design tests . 34
63 Routine tests . 36
64 General . 36
65 Tightness of equipment . 37
66 Capacitance and tan measurement at power-frequency . 37
67 Power-frequency or DC withstand test . 38
68 Partial discharge measurement . 39
69 AC-withstand test on low-voltage terminal of the equipment . 40
70 Resistance measurement for DC equipment . 40
71 Verification of markings . 40
72 Gas dew point measurement . 40
73 Type tests . 41
74 General . 41
75 Impulse tests . 41
76 Wet test for outdoor equipment . 42
77 Radio interference voltage test . 44
78 Polarity reversal test for DC equipment . 44
79 Temperature rise test . 45
80 Enclosure tightness test at ambient temperature . 47
81 Mechanical tests . 47
82 Special tests . 48
83 Determination of the temperature coefficient of capacitance TC . 48
84 Enclosure tightness test at low and high temperatures . 49
85 Internal arc test . 50
86 Multiple chopped impulse test on primary terminals . 50
87 Measurement of the impedance depending on frequency . 50
88 Thermal stability test . 50
89 Corrosion test . 51
90 Design tests . 51
91 Ageing test . 51
92 8 Rules for transport, storage, erection, operation and maintenance . 52
93 General . 52
94 Conditions during transport, storage and installation . 52
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95 Installation . 53
96 General . 53
97 Unpacking and lifting . 53
98 Assembly . 53
99 Mounting . 53
100 Connections . 53
101 Final installation inspection and tests . 53
102 Maintenance . 54
103 General . 54
104 Responsibilities for the manufacturer . 54
105 9 Safety . 54
106 10 Influence of products on the natural environment . 54
107 Annex A (informative) Typical diagram of an equipment . 56
108 Annex B (informative) Partial discharge test circuit and instrumentation . 57
109 Annex C (normative) Radio interference voltage – Measurement circuit . 59
110 Annex D (informative) Superimposed impulse voltage test . 61
111 Annex E (informative) Test circuit for superimposed impulse voltage tests . 63
112 Annex F (informative) High-frequency characteristic measurements . 65
113 F.1 Bridge method for measurement of the high-frequency capacitance and
114 equivalent series resistance . 65
115 Annex G (informative) Composite AC/DC voltages . 66
116 G.1 Composite AC/DC voltage descriptions . 66
117 G.2 Example 1 – without 3PWM . 67
118 G.3 Example 2 – with 3PWM . 68
119 G.4 Conclusion . 69
120 Annex H (informative) Voltage definitions . 70
121 Bibliography . 71
123 Figure 1 – Factor m for the switching impulse withstand test . 19
124 Figure 2 – Reduced scale model capacitor element geometry . 30
125 Figure 3 – Flow charts test sequence to be applied when performing the routine test. 35
126 Figure 4 – Flow charts test sequence to be applied when performing the type test . 36
127 Figure 5 – Test sequence for polarity reversal tests . 45
128 Figure 6 – Flow chart for temperature rise test . 46
130 Figure A.1 – Example of a diagram for a coupling capacitor (with and without low
131 voltage terminal) . 56
132 Figure A.2 – Example of a diagram for a capacitor divider (with and without low voltage
133 terminal) . 56
134 Figure B.1 – Test circuit . 57
135 Figure B.2 – Alternative circuit . 57
136 Figure B.3 – Example of balanced test circuit . 58
137 Figure B.4 – Example of calibration circuit . 58
138 Figure C.1 – Measuring circuit . 60
139 Figure D.1 – Schematic representation of superimposed impulse voltage tests . 61
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140 Figure E.1 – Test circuit for superimposed impulse tests using blocking capacitor . 63
141 Figure E.2 – Test circuit for superimposed impulse tests using sphere gap . 64
142 Figure F.1 – Wiring diagram of the measuring circuit for the high-frequency
143 capacitance and equivalent series resistance of a coupling capacitor . 65
144 Figure G.1 – Example of an unsymmetrically VSC converter . 66
145 Figure G.2 – Maximum peak voltage without 3PWM . 67
146 Figure G.3 – Both individual AC voltage curves with 3PWM . 69
147 Figure G.4 – Superimposed voltage curve with 3PWM, based on Figure G.3 . 69
148 Figure H.1 – Voltage overview and definitions. 70
150 Table 1 – Rated ambient temperature categories . 17
151 Table 2 – Standard values of rated voltage factors . 21
152 Table 3 – Standard insulation levels for AC voltages . 22
153 Table 4 – Partial discharge test voltages and permissible levels . 24
154 Table 5 – Creepage distance for AC . 25
155 Table 6 – Static withstand test loads for insulators . 27
156 Table 7 – Permissible temporary leakage rates for gas systems . 28
157 Table 8 – Marking of the rating plate . 31
158 Table 9 – Test voltages for units, stacks and complete equipment . 39
159 Table 10 – Modalities of application of the test loads to the line primary terminals . 48
160 Table 11 – Voltage definitions for DC application . 70
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163 INTERNATIONAL ELECTROTECHNICAL COMMISSION
164 ___________
166 COUPLING CAPACITORS AND CAPACITOR DIVIDERS –
168 Part 1: General rules
170 FOREWORD
171 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
172 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
173 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
174 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
175 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
176 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
177 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
178 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
179 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
180 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
181 consensus of opinion on the relevant subjects since each technical committee has representation from all
182 interested IEC National Committees.
183 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
184 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
185 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
186 misinterpretation by any end user.
187 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
188 transparently to the maximum extent possible in their national and regional publications. Any divergence between
189 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
190 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
191 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
192 services carried out by independent certification bodies.
193 6) All users should ensure that they have the latest edition of this publication.
194 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
195 members of its technical committees and IEC National Committees for any personal injury, property damage or
196 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
197 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
198 Publications.
199 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
200 indispensable for the correct application of this publication.
201 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
202 rights. IEC shall not be held responsible for identifying any or all such patent rights.
203 International Standard IEC 60358-1 has been prepared by IEC Technical Committee 33: Power
204 capacitors and their applications.
205 This standard cancels and replaces the first edition of IEC 60358-1:2012, and constitutes a
206 technical revision.
207 This second edition of IEC 60358-1 includes the following significant technical changes with
208 respect to the first edition:
209 – new terms and definitions are presented in clause 3.
210 – new definitions in clause 4, clause 5
211 – gas-insulated capacitors and capacitor dividers are integrated in clause 6.
212 – new tests in routine, type, special and design test sections are introduced, see clause 7
213 – new clause 8, clause 9 and clause 10
214 – new Annex D, Annex E, Annex F, Annex G and Annex H
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215 The text of this standard is based on the following documents:
FDIS Report on voting
33/xxx/FDIS 33/xxx/RVD
217 Full information on the voting for the approval of this standard can be found in the report on
218 voting indicated in the above table.
219 The language used for the development of this International Standard is English
220 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in accordance
221 with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at
222 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are described in
223 greater detail at www.iec.ch/publications.
224 The updated list of standards issued by IEC TC 33 is available at the website: https://www.iec.ch
225 IEC 60358-1, Coupling capacitors and capacitor dividers – Part 1: General rules
226 IEC 60358-2, Coupling capacitors and capacitor dividers – Part 2: AC or DC single-phase
227 coupling capacitor connected between line and ground for power line carrier -
228 frequency (PLC) application
229 IEC 60358-3, Coupling capacitors and capacitor dividers – Part 3: AC or DC single-phase
230 coupling capacitor for harmonic-filters applications
231 IEC 60358-4, Coupling capacitors and capacitor dividers – Part 4: DC or AC single-phase
232 capacitor dividers
233 The committee has decided that the contents of this publication will remain unchanged until the
234 stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
235 the specific publication. At this date, the publication will be
236 • reconfirmed,
237 • withdrawn,
238 • replaced by a revised edition, or
239 • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
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242 INTRODUCTION
243 This document is the first revision of the standard IEC 60358-1, defining general rules for
244 coupling capacitors and capacitor dividers.
245 The main modifications of this revision are listed below:
246 • terms and definitions:
247 – new terms and definitions are presented in clause 3;
248 • normal and special environmental conditions:
249 – new definitions in clause 4 are introduced;
250 • ratings:
251 – addition of HV insulation levels above 800 kV;
252 – new definition on rated voltage U for AC and DC applications;
r
253 – clause 5, new definitions for DC application are integrated;
254 – new standard values of rated voltages are defined;
255 • design and construction:
256 – clarification of the altitude correction for external insulation and dielectric tests;
257 – external insulation requirements for DC application;
258 – gas-insulated capacitors and capacitor dividers are integrated in clause 6;
259 – new test with its requirements on capacitor element ageing is defined;
260 • type tests:
261 – temperature rise test: more accurate definition of the test duration;
262 – lightning impulse test: new test procedure (15 impulses) for U ≥ 300 kV;
m
263 – mechanical test: moved from special test to type test;
264 – new enclosure tightness test for gas-insulated capacitors and dividers;
265 • routine tests:
266 – tightness tests for gas-insulated equipment;
267 – gas dew point measurements;
268 – new flowchart of routine tests presented in Figure 3;
269 • special tests:
270 – determination of temperature coefficient of the capacitor element;
271 – new enclosure tightness test on low and hot temperature;
272 – information about internal arc tests;
273 – information about multiple chopped impulse tests;
274 – new test on impedance measurements depending on frequency;
275 – new test on thermal stability;
276 – new test on corrosion;
277 – new flowchart of type tests presented in Figure 4;
278 • design tests (new clause):
279 – ageing tests of capacitor elements;
280 • commissioning tests (new clause):
281 – new installation inspection;
282 – gas dew point test moved from special test to commissioning tests;
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283 • rules for transport, storage, erection, operation and maintenance:
284 – new mandatory rules for user and manufacturer;
285 – new conditions for transportation and storage;
286 • new annexes:
287 – Annex D (informative): provide information about superimposed impulse voltages;
288 – Annex E (informative): provide information on test setups for superimposed impulse
289 voltage tests;
290 – Annex F (informative): is introduced on high-frequency characteristic measurements;
291 – Annex G (informative): provide information about composite AC/DC voltages;
292 – Annex H (informative): present a summary of all voltages used in DC application;
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294 COUPLING CAPACITORS AND CAPACITOR DIVIDERS –
296 Part 1: General rules
300 1 Scope
301 This part of IEC 60358 applies to:
302 • Capacitors and capacitor dividers, with rated voltage 1 000 V, connected line to ground
303 with the low voltage terminal either permanently earthed or connected to devices, for
304 applications listed hereunder and other similar uses.
305 This standard serves as basic standard for the coupling capacitors and capacitor dividers. The
306 different parts of this standard will present the supplementary specifications and tests, for
307 example IEC 60358-2, IEC 60358-3 or IEC 60358-4.
308 NOTE Diagrams of coupling capacitor and capacitor divider to which this standard applies are given in Figures A.1
309 and A.2.
310 2 Normative references
311 The following documents, in whole or in part, are normatively referenced in this document and
312 are indispensable for its application. For dated references, only the edition cited applies. For
313 undated references, the latest edition of the referenced document (including any amendments)
314 applies.
315 IEC 60038, IEC standard voltages
316 IEC 60050-321:1986, International Electrotechnical Vocabulary – Chapter 321: Instrument
317 transformers
318 IEC 60050-436:1990, International Electrotechnical Vocabulary – Chapter 436: Power
319 capacitors
320 IEC 60050-601:1985, International Electrotechnical Vocabulary – Chapter 601: Generation,
321 transmission and distribution of electricity – General
322 IEC 60050-604:1987, International Electrotechnical Vocabulary – Chapter 604: Generation,
323 transmission and distribution of electricity – Operation
324 IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
325 IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing
326 IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
327 IEC 60071-2, Insulation co-ordination – Part 2: Application guidelines
328 IEC 60071-11, Insulation co-ordination – Part 11: Definitions, principles and rules for HVDC
329 system
330 IEC 60085, Electrical insulation – Thermal evaluation and designation
331 IEC 60270, High-voltage test techniques – Partial discharge measurements
332 IEC 60296, Fluids for electrotechnical applications – Mineral insulating oils for electrical
333 equipment
334 IEC 60376, Specification of technical grade sulphur hexafluoride (SF6) and complementary
335 gases to be used in its mixtures for use in electrical equipment
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336 IEC 60480, Specifications for the re-use of sulphur hexafluoride (SF6) and its mixtures in
337 electrical equipment
338 IEC 60721 (all parts), Classification of environmental conditions
339 IEC guide 109-2003, Environmental aspects –Inclusion in electrotechnical product standards
340 IEC TS 60815-1:2008, Selection and dimensioning of high-voltage insulators intended for use
341 in polluted conditions – Part 1: Definitions, information and general principles
342 IEC TS 60815-2:2008, Selection and dimensioning of high-voltage insulators intended for use
343 in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems
344 IEC TS 60815-3:2008, Selection and dimensioning of high-voltage insulators intended for use
345 in polluted conditions – Part 3: Polymer insulators for a.c. systems
346 IEC 60867, Insulating liquids – Specifications for unused liquids based on synthetic aromatic
347 hydrocarbons
348 IEC 61099, Insulating liquids – Specifications for unused synthetic organic esters for electrical
349 purposes
350 IEC 61462, Composite hollow insulators – Pressurized and unpressurized insulators for use in
351 electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods and
352 acceptance criteria and design recommendations
353 IEC 62217:2012, Polymeric HV insulators for indoor and outdoor use – General definitions, test
354 methods and acceptance criteria
355 IEC 62271-4:2022, High-voltage switchgear and controlgear – Part 4: Handling procedures for
356 gases for insulation and/or switching
357 IEC 62770, Fluids for electrotechnical applications – Unused natural esters for transformers
358 and similar electrical equipment
359 IEC 63012, Insulating liquids – Unused modified or blended esters for electrotechnical
360 applications
361 ISO 4628-3, Paints and varnishes – Evaluation of degradation of coatings – Designation of
362 quantity and size of defects, and of intensity of uniform changes in appearance – Part 3:
363 Assessment of degree of rusting
364 ISO 22479, Corrosion of metals and alloys – Sulfur dioxide test in a humid atmosphere (fixed
365 gas method)
366 CISPR/TR 18-2, Radio interference characteristics of overhead power lines and high-voltage
367 equipment – Part 2: Methods of measurement and procedure for determining limits
368 3 Terms, definitions, symbols and abbreviated terms
369 For the purposes of this document, the following terms and definitions apply.
370 ISO and IEC maintain terminology databases for use in standardization at the following
371 addresses:
372 • IEC Electropedia: available at https://www.electropedia.org/;
373 • ISO Online browsing platform: available at https://www.iso.org/obp.
374 NOTE Some of these terms and definitions are identical with or are similar to those of IEC 60050-321:1986,
375 IEC 60050-436:1990, IEC 60050-601:1985 and IEC 60050-604:1987. These are indicated by the relevant reference
376 in brackets.
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377 General
379 rated frequency of equipment
380 f
r
381 frequency for which the coupling capacitor has been designed
383 rated voltage
384 U
r
385 AC: based on the maximum voltage Um including superimposed harmonic and sub-harmonic
386 voltages between phase to ground
387 DC: the highest value of line to ground voltage, including harmonics and commutation
388 overshoots, for which the equipment is designed and may be used in respect of its insulation
390 highest voltage for equipment
391 U
m
392 AC: the highest r.m.s. value of phase-to-phase voltage for which the equipment is designed and
393 may be used in respect of its insulation
394 [SOURCE: IEC 60050-614:2016, 614-03-01, modified – Symbol added, "(rms value)" deleted,
395 "service" replaced with "operating" and "greatest" replaced with "highest"]
397 Creepage distance voltage
398 U
cd
399 voltage which is needed to calculate the creepage distance based on IEC/TS 60815 -4
401 DC system voltage
402 U
DC
403 highest mean or average operating voltage to earth, excluding harmonics and commutation
404 overshoots
405 [SOURCE: IEC 60071-5]
407 Maximum DC-system voltage
408 U
DCmax
409 maximum DC-system voltage is almost a pure DC voltage with a magnitude dependent on
410 voltage control and measuring tolerance excluding harmonics and commutation overshoots
412 Rated lightning impulse withstand voltage
413 U
LIWV
highest peak value of the lightning impulse voltage which does not cause breakdown of
insulation under specified conditions
[SOURCE: IEC60050-442:2002, 442-09-18 – modified]
415 Rated switching impulse withstand voltage
416 U
SIWV
highest peak value of the switching impulse voltage which does not cause breakdown of
insulation under specified conditions
[SOURCE: IEC60050-442:2002, 442-09-18 – modified]
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418 Maximum voltage across a capacitor
419 U
C
420 maximum composite AC/DC voltage across a capacitor placed between the converter
421 transformer and the VSC converter.
423 rated insulation level
424 combination of voltage values which characterises the insulation of the equipment with regard
425 to its capability to withstand dielectric stresses
427 isolated neutral system
428 system where the neutral point is not intentionally connected to earth, except for high
429 impedance connections for protection or measurement purposes
430 [SOURCE: IEC 60050-601:1985, 601-02-24]
432 solidly earthed (neutral) system
433 system whose neutral point(s) is (are) earthed directly
434 [SOURCE: IEC 60050-601:1985, 601-02-25]
436 impedance earthed (neutral) system
437 system whose neutral point(s) is (are) earthed through impedances to limit earth fault currents
438 [SOURCE: IEC 60050-601:1985, 601-02-26]
440 resonant earthed (neutral) system
441 system in which one or more neutral points are connected to earth through reactances which
442 approximately compensate the capacitive component of a single-phase-to-earth fault current
443 [SOURCE: IEC 60050-601:1985, 601-02-27]
444 NOTE 1 to entry: With resonant earthing of a system, the residual current in the fault is limited to such an extent
445 that an arcing fault in air is self-extinguishing.
447 earth fault factor
448 at a given location of a three-phase system, and for a given system configuration, the ratio of
449 the highest r.m.s. phase-to-earth power frequency voltage on a healthy phase during a fault to
450 earth affecting one or more phases at any point on the system to the r.m.s. value of phase -to-
451 earth power frequency voltage which would be obtained at the given location in the absence of
452 any such fault
453 [SOURCE: IEC 60050-604:1987, 604-03-06]
455 earthed neutral system
456 system in which the neutral is connected to earth either solidly or through a resistance or
457 reactance of sufficiently low value to reduce transient oscillations and to give a current sufficient
458 for selective earth fault protection
459 a) A three-phase system with effectively earthed neutral at a given location is a system
460 characterized by an earth fault factor at this point which does not exceed 1,4
461 NOTE 1 to entry: This condition is obtained approximately when, for all system configurations, the ratio of zero -
462 sequence reactance to the positive-sequence reactance is less than 3 and the ratio of zero-sequence resistance
463 to positive-sequence reactance is less than one.
464 b) A three-phase system with non-effectively earthed neutral at a given location is a system
465 characterized by an earth fault factor at this point that may exceed 1,4
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467 unified specific creepage distance USCD
468 creepage distance of an insulator divided by the r.m.s value of the highest operating voltage
469 across the insulator
470 NOTE 1 to entry: This definition differs from that of specific creepage distance where the line-line value of the
471 highest voltage for the equipment is used (for AC systems usually U /√3). For line-to-earth insulation, this definition
m
472 will result in a value that √3 times that given by the definition of specific creepage distance in IEC/TR 60815 -1:2008.
473 NOTE 2 to entry: For U see IEC 60050-604:1987, 604-03-01.
m
474 NOTE 3 to entry: It is generally expressed in mm/kV and usually expressed as a minimum.
476 exposed installation
477 installation in which the apparatus is subject to overvoltages of atmospheric origin.
478 NOTE Such installations are usually connected to overhead transmission lines either directly or through a short
479 length of cable.
481 non-exposed installation
482 installation in which the apparatus is not subject to overvoltages of atmospheric origin
483 NOTE 1 to entry: Such installations are usually connected to underground cable networks.
485 rated voltage factor
486 F
V
487 multiplying factor to be applied to the rated voltage U to determine the maximum voltage at
r
488 which equipment must comply with relevant thermal requirements for a specified time
490 rated temperature category of the equipment
491 range of temperature of the ambient air or of the cooling medium for which the equipment has
492 been designed
494 line terminal
495 terminal intended for connection to a line conductor of a network
496 [SOURCE: IEC 60050-436:1990, 436-03-01]
498 mechanical stress
499 stresses on different parts of the equipment as a function of four main forces:
500 – forces on the terminals due to the line connections,
501 – forces due to the wind on the cross-section of the equipment with and without line trap
502 mounted on the top of a coupling/filter capacitor,
503 – seismic forces and
504 – electrodynamic forces due to short circuit current
506 voltage-connected equipment
507 equipment which has only one connection to the high voltage line
508 NOTE 1 to entry: Under normal conditions the top connection carries only the current of the equipment.
510 current-connected equipment
511 equipment which has two connections to the high voltage line
512 NOTE 1 to entry: The terminals and the top connection are designed to carry the line current under normal
513 conditions.
oSIST prEN IEC 60358-1:2025
IEC 60358-1 ED2 © IEC 2024 15 33/718/CDV
515 line trap-connected coupling/filter capacitor
516 coupling/filter capacitor which supports a line trap on its top
517 NOTE 1 to entry: In this case, the two connections to the line trap carry the HV line current and one connection
518 from the line trap to the capacitor carries the current of the capacitor
519 NOTE 2 to entry: The pedestal-mounting line traps in two phases generate ad
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