High-voltage switchgear and controlgear - Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated voltages above 52 kV

IEC 62271-207:2012 applies to gas-insulated switchgear assemblies for alternating current of rated voltages above 52 kV for indoor and outdoor installations, including their supporting structure. This second edition of IEC 62271-207 cancels and replaces the first edition published in 2007. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- modification of the minimum voltage rating from 72,5 kV to above 52 kV;
- harmonisation of qualification procedures for GIS with IEEE 693:2005 Annex A and P by modifying the response spectra;
- modification of the test procedures;
- addition of criteria of allowed stresses;
- addition of dynamic analysis CQC. The contents of the corrigendum of January 2013 have been included in this copy.

Appareillage à haute tension - Partie 207: Qualification sismique pour ensembles d'appareillages à isolation gazeuse pour des niveaux de tension assignée supérieurs à 52 kV

La CEI 62271-207:2012 s'applique aux ensembles d'appareillages à isolation gazeuse à courant alternatif de tension assignée supérieure à 52 kV, installés à l'intérieur ou à l'extérieur, en incluant leurs châssis-supports. Cette deuxième édition de la CEI 62271-207 annule et remplace la première édition publiée en 2007. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- modification de la tension assignée minimale, passant d'une valeur de 72,5 kV à une valeur supérieure à 52 kV;
- harmonisation des procédures de qualification pour ensembles d'appareillage à isolation gazeuse avec les Annexes A et P de l'IEEE 693:2005 en modifiant les spectres de réponse;
- modification des procédures d'essai;
- ajout de critères des contraintes autorisées;
- ajout d'une analyse dynamique CQC. Le contenu du corrigendum de janvier 2013 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
26-Apr-2012
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
27-Apr-2012
Completion Date
27-Apr-2012
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IEC 62271-207
Edition 2.0 2012-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –

Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated

voltages above 52 kV
Appareillage à haute tension –
Partie 207: Qualification sismique pour ensembles d'appareillages à isolation
gazeuse pour des niveaux de tension assignée supérieurs à 52 kV
IEC 62271-207:2012
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62271-207
Edition 2.0 2012-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –

Part 207: Seismic qualification for gas-insulated switchgear assemblies for rated

voltages above 52 kV
Appareillage à haute tension –
Partie 207: Qualification sismique pour ensembles d'appareillages à isolation
gazeuse pour des niveaux de tension assignée supérieurs à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 29.130.10 ISBN 978-2-88912-060-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 62271-207  IEC:2012
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope ............................................................................................................................... 5

2 Normative references ....................................................................................................... 5

3 Terms and definitions ....................................................................................................... 5

4 Seismic qualification requirements ................................................................................... 6

4.1 General ................................................................................................................... 6

4.2 Qualification levels .................................................................................................. 6

5 Test procedures for qualification ....................................................................................... 6

5.1 General ................................................................................................................... 6

5.2 Mounting ................................................................................................................. 7

5.3 Measurements ......................................................................................................... 7

5.4 Frequency range ..................................................................................................... 7

5.5 Test severity ........................................................................................................... 7

5.5.1 General ....................................................................................................... 7

5.5.2 Parameters for time-history excitation .......................................................... 9

5.5.3 Test directions ............................................................................................. 9

5.5.4 Test sequence ............................................................................................. 9

6 Qualification by combined test and numerical analysis ................................................... 10

6.1 General ................................................................................................................. 10

6.2 Dynamic and functional data ................................................................................. 11

6.3 Numerical analysis ................................................................................................ 11

6.3.1 General ..................................................................................................... 11

6.3.2 Numerical analysis by the acceleration time-history method ...................... 11

6.3.3 Modal and spectrum analysis using the required response spectrum

(RRS) ........................................................................................................ 11

6.3.4 Static coefficient analysis .......................................................................... 12

7 Evaluation of the seismic qualification ............................................................................ 12

7.1 Combination of stresses ........................................................................................ 12

7.2 Acceptance criteria for the seismic waveform ........................................................ 13

7.3 Functional evaluation of the test results ................................................................ 13

7.4 Allowable stresses ................................................................................................ 13

8 Documentation ............................................................................................................... 13

8.1 Information for seismic qualification....................................................................... 13

8.2 Test report ............................................................................................................ 14

8.3 Analysis report ...................................................................................................... 14

Annex A (normative) Characterisation of the test-set ........................................................... 15

Annex B (informative) Criteria for seismic adequacy of gas-insulated metal-enclosed

switchgear ............................................................................................................................ 17

Bibliography .......................................................................................................................... 19

Figure 1 – Required response spectrum (RRS) for qualification level moderate ...................... 8

Figure 2 – Required response spectrum (RRS) for qualification level high .............................. 9

Figure A.1 – Monogram for the determination of equivalent damping ratio ............................ 16

Table 1 – Seismic qualification levels for switchgear assemblies – Horizontal severities ......... 6

---------------------- Page: 4 ----------------------
62271-207  IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 207: Seismic qualification for gas-insulated
switchgear assemblies for rated voltages above 52 kV
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

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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

International Standard IEC 62271-207 has been prepared by subcommittee 17C: High-voltage

switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and

controlgear.

This second edition of IEC 62271-207 cancels and replaces the first edition published in 2007.

It constitutes a technical revision.

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

edition:
– modification of the minimum voltage rating from 72,5 kV to above 52 kV;

– harmonisation of qualification procedures for GIS with IEEE 693:2005 Annex A and P by

modifying the response spectra;
– modification of the test procedures;
– addition of criteria of allowed stresses;
---------------------- Page: 5 ----------------------
– 4 – 62271-207  IEC:2012
– addition of dynamic analysis CQC.
The text of this standard is based on the following documents:
FDIS Report on voting
17C/542/FDIS 17C/549/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

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

A list of all the parts in the IEC 62271 series, under the general title High-voltage switchgear

and controlgear, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of January 2013 have been included in this copy.

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.
---------------------- Page: 6 ----------------------
62271-207  IEC:2012 – 5 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 207: Seismic qualification for gas-insulated
switchgear assemblies for rated voltages above 52 kV
1 Scope

This part of IEC 62271 applies to gas-insulated switchgear assemblies for alternating current

of rated voltages above 52 kV for indoor and outdoor installations, including their supporting

structure.

For switchgear devices, e.g. live tank circuit breakers, IEC/TR 62271-300 is applicable.

Guidance on interactions between the supporting structure and the soil / foundations is

provided in Annex B.

The seismic qualification of the switchgear assemblies takes into account testing of typical

switchgear assemblies combined with methods of analysis. Mutual interaction between

directly mounted auxiliary and control equipment and switchgear assemblies are covered.

The seismic qualification of switchgear assemblies is only performed upon request.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60068-2-47, Environmental testing – Part 2-47: Tests – Mounting of specimens for

vibration, impact and similar dynamic tests

IEC 60068-2-57, Environmental testing – Part 2-57: Tests – Test Ff: Vibration – Time-history

method

IEC 60068-3-3:1991, Environmental testing – Part 3: Guidance – Seismic test methods for

equipments

IEC 62271-1, High-voltage switchgear and controlgear – Part 1: Common specifications

IEC 62271-203, High-voltage switchgear and controlgear – Part 203: Gas-insulated metal-

enclosed switchgear for rated voltages above 52 kV
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60068-3-3,

IEC 62271-203 and IEC 62271-1 apply.
---------------------- Page: 7 ----------------------
– 6 – 62271-207  IEC:2012
4 Seismic qualification requirements
4.1 General

The seismic qualification shall demonstrate the ability of the switchgear assemblies to

withstand seismic stress. It may be proofed by test or by a combination of test and analysis.

No failure on the enclosure and the main circuits as well as on the control and auxiliary

circuit, including the relevant supporting structures, shall occur.

For ductile material, minor permanent deformations are acceptable provided that they do not

impair the functionality of the equipment. The equipment shall properly operate after the

seismic event as defined in 7.2 and 7.3.
4.2 Qualification levels

The qualification has to be done on one of the recommended levels of Table 1. For vertical

severities the direction factor is 0,5.

No qualification is required for low seismic level as far as construction practice and seismic

construction practice comply with the state of the art.

Other qualification levels which consist in requirements from the customer that can be based

on specific investigation at site or regulations in national standard, taking into account for

example the type of soil, soil structure interaction, building response, and elevation may be

used.
Table 1 – Seismic qualification levels for switchgear assemblies –
Horizontal severities
Qualification Required response Zero period acceleration
level spectrum (RRS) (ZPA)
m/s
High Figure 2 5
Moderate Figure 1 2,5
Low --- 1
5 Test procedures for qualification
5.1 General

The test procedure for qualification of a test-set shall be in accordance with IEC 60068-3-3.

The qualification shall be carried out on a representative test-set.

NOTE 1 For GIS it is not possible to test a complete substation on a shake table, because of the size and weight.

Numerical analysis is always needed to give information about the seismic qualification.

The seismic test needs to be carried out under the rated filling pressure of the GIS.

The rated filling pressure in the GIS is required to test under realistic situations. Nevertheless

test laboratories for seismic testing need adequate safety measures. Test laboratories are

available in USA, Europe and Japan.
During the seismic testing no operation of the circuit breaker is necessary.
---------------------- Page: 8 ----------------------
62271-207  IEC:2012 – 7 –

NOTE 2 The circuit breaker operates much faster than any earthquake excitation and therefore a switching

operation has no practical impact on the test result.

If the auxiliary and control equipment or other parts of the equipment are dynamically

uncoupled, they may be qualified independently.

If a test-set cannot be tested with its supporting structure (e.g., due to its size), the dynamic

contribution of the structure shall be determined by analysis and taken into account in the

test.

The time-history test method is to be preferred, since it more closely simulates actual

conditions, particularly if the behaviour of the test-set is not linear. The test method shall be in

accordance with IEC 60068-2-57.
5.2 Mounting
The test-set shall be mounted as in service including dampers (if any).

The horizontal orientation of the test-set shall be in the direction of excitation acting along its

two main orthogonal axes.

Any fixations or connections that are required only the convenience of testing must not affect

the dynamic behaviour of the test-set.

The method of mounting of the test-set shall be documented and shall include a description of

any interposing fixtures and connections. IEC 60068-2-47 provides guidance.
5.3 Measurements

Measurements shall be performed in accordance with IEC 60068-3-3 and shall include

– vibration motion of components where maximum deflections and significant relative

displacements are expected;

– strains of critical elements (e.g. bushings, flanges, enclosures and support structures).

5.4 Frequency range

Frequency range shall be 0,5 Hz to 33 Hz. The frequency range is applied to the resonant

frequency search test and the generation of artificial earthquake wave.
5.5 Test severity
5.5.1 General
The test severity shall be chosen in accordance with Clause 4.

The recommended required response spectra are given in Figures 1 and 2 for the different

seismic qualification levels. The curves relate to 2 %, 5 %, 10 % of the switchgear

assemblies. If damping factor is unknown, 2 % damping is applied.
Spectra for different damping values may be obtained by linear interpolation.
---------------------- Page: 9 ----------------------
– 8 – 62271-207  IEC:2012
0,9
d = 2
0,8
0,7
d = 5
0,6
d = 10
0,5
0,4
0,3
0,2
0,1

0,2 0,4 0,6 1 2 4 6 10 20 40 100

f (Hz)
IEC 694/12
Spectral Accelerations, S (g), for Frequencies, f (Hz):
S = 0,572 β f for 0,0 ≤ f ≤ 1,1
S = 0,625 β for 1,1 ≤ f ≤ 8,0
S = (6,6 β – 2,64) / f – 0,2 β + 0,33 for 8,0 ≤ f ≤ 33
S = 0,25 for f > 33

β = (3,21 – 0,68 ln(d)) / 2,115 6, where d is the percent damping (2, 5, 10, etc.) and d ≤ 20 %

Figure 1 – Required response spectrum (RRS) for qualification level moderate
S (g)
---------------------- Page: 10 ----------------------
62271-207  IEC:2012 – 9 –
1,8
d = 2
1,6
1,4
d = 5
1,2
d = 10
1,0
0,8
0,6
0,4
0,2

0,1 0,2 0,4 0,6 1 2 4 6

10 20 40 100
f (Hz)
IEC 695/12
Spectral Accelerations, S (g), for Frequencies, f (Hz):
S = 1,144 β f for 0,0 ≤ f ≤ 1,1
S = 1,25 β for 1,1 ≤ f ≤ 8,0
S = (13,2 β – 5,28) / f – 0,4 β + 0,66 for 8,0 ≤ f ≤ 33
S = 0,5 for f > 33

β = (3,21 – 0,68 ln(d)) / 2,1156, where d is the percent damping (2, 5, 10, etc.) and d ≤ 20%

Figure 2 – Required response spectrum (RRS) for qualification level high
5.5.2 Parameters for time-history excitation

The total duration of the time-history shall be about 30 s, of which the strong part shall not be

less than 20 s. The duration of strong part shall start when the time-history excitation first

reaches 25 % of its maximum acceleration. It shall end when the time-history excitation drops

below 25 % of its maximum acceleration for the last time.
5.5.3 Test directions
The test directions shall be chosen according to IEC 60068-3-3.

In some cases, the effect of the vertical acceleration results in negligible stresses and the

vertical excitation may be omitted. In such cases justification for the omission of the vertical

component shall be provided.
5.5.4 Test sequence
5.5.4.1 General
The test sequence shall be as follows:
S (g)
---------------------- Page: 11 ----------------------
– 10 – 62271-207  IEC:2012
– functional checks before testing;

– vibration response investigation (required to determine natural frequencies and damping

ratios and/or for analysis);
– seismic qualification test;
– functional checks after testing.
5.5.4.2 Functional checks

Before and after the tests, the following operating characteristics or settings shall be recorded

or evaluated (when applicable) at the rated supply voltage and at rated filling pressure for

operation p :
a) closing time;
b) opening time;
c) time spread between units of one pole;
d) time spread between poles (if multipole tested);
e) gas and/or liquid tightness;
f) resistance measurement of the main current path.
5.5.4.3 Vibration response investigation

The resonant frequency search test and the damping measurement test shall be carried out

according to IEC 60068-3-3 over the frequency range stated in 5.4.
5.5.4.4 Seismic qualification test

The test shall be performed by applying one of the procedures stated in the flow charts of

Annex A of IEC 60068-3-3:1991, depending on the test facilities.
The test shall be performed once at the level chosen in 4.2.
During the seismic test the following parameters shall be recorded:

– strains of critical elements (e.g. bushings, flanges, enclosures and support structures);

– deflection of components where significant displacements are expected;
– electrical continuity of the main circuit (if applicable);

– electrical continuity of the auxiliary and control circuit at the rated voltage;

– acceleration.
6 Qualification by combined test and numerical analysis
6.1 General
The method may be used

– to qualify switchgear assemblies already tested under different seismic conditions;

– to qualify switchgear assemblies similar to assemblies already tested but which include

modifications influencing the dynamic behaviour (e.g. change or extension of the
arrangement or in the mass of components);

– to qualify switchgear assemblies if their dynamic and functional data are known;

– to qualify switchgear assemblies which cannot be qualified by testing (e.g. because of

their size, their weight or their complexity).
---------------------- Page: 12 ----------------------
62271-207  IEC:2012 – 11 –
6.2 Dynamic and functional data

Dynamic data (damping ratios, natural frequencies, stresses of critical elements as a function

of input acceleration) for analysis shall be obtained by one of the following:
a) a dynamic test of a similar test-set;
b) a dynamic test at reduced test levels;

c) determination of natural frequencies and damping ratios by other tests such as free

oscillation tests or low level excitation (see Annex A).

Functional data may be obtained from a previous test performed on a similar test-set.

6.3 Numerical analysis
6.3.1 General
The general procedure is as follows:
a) Mathematical model:

On the basis of technical information concerning the design characteristics of the

substation, a three-dimensional model of the test-set shall be created. Such a model shall

take into consideration the presence of actual compartments and of their supporting

structures, and shall have sufficient sensitivity to describe the dynamic behaviour of the

test-set in the frequency range being studied.
b) Calibration of the model:

Using experimental data stated in 6.2, the mathematical model shall be calibrated in order

to assess its dynamic characteristics. Considering the modularity of switchgear

assemblies, the mathematical model implemented and calibrated for the test-set may be

extented to a complete substation, provided that the right adaptations, related to the

structural differences existing for the different modules, are considered;
c) Response of the analysis:

The response, in the frequency range stated in 5.4, using either of the methods described

in the following subclauses has to be determined. Other methods may be used if they are

properly justified.
6.3.2 Numerical analysis by the acceleration time-history method

When the seismic analysis is carried out by the time-history method, the ground motion

acceleration time-histories shall comply with the RRS (see Table 1). Two types of

superimposition may generally be applied depending on the complexity of the analysis:

a) separate
...

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