IEC 62271-207:2023 applies to – gas-insulated switchgear (GIS) assemblies – for alternating current of rated voltages above 52 kV complying with IEC 62271-203, and – for direct current of rated voltages including and above 100 kV, – for indoor and outdoor installations, including their supporting structures, – AC metal-enclosed switchgear and controlgear assemblies for rated voltages above 1 kV and up to and including 52 kV complying with IEC 62271-200, ground or floor mounted, intended to be used under seismic conditions, and – AC solid-insulation enclosed switchgear and controlgear assemblies for rated voltages above 1 kV and up to and including 52 kV complying with IEC 62271-201, ground or floor mounted, intended to be used under seismic conditions. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. It also cancels and replaces, through merging, the first edition of IEC TS 62271-210 published in 2013. This edition includes the following significant technical changes with respect to the previous edition: a) modification of the minimum voltage rating from 52 kV to above 1 kV in order to include medium voltage equipment previously being within IEC TS 62271-210 scope; b) further harmonisation of qualification procedures with the revised IEEE Std 693-2018 [1], Annex A and Annex P, including 1) matching this document’s required response spectra with IEEE Std 693-2018 performance level spectra and IEC TS 62271-210 spectra, 2) addition of a step-by-step procedure assisting the user of this document to select an appropriate seismic qualification level combining seismic integrity with cost-effective design, 3) addition of analytical earthquake component combination techniques, and 4) reference to publicly available accelerograms specially developed to match the IEEE Std 693-2018 spectra for testing and analysis purposes, since this document and IEC TS 62271-210 spectra are identical in shape with IEEE Std 693 spectra. c) various enhancements of test procedures; d) addition of minimum contents for seismic qualification reports; e) scope extended to cover DC GIS including and above 100 kV.

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1	30485189
53	A-30432259
54	undefined
57	Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
58	English CONTENTS
60	FOREWORD
62	1 Scope 2 Normative references
63	3 Terms and definitions
67	4 Seismic qualification requirements 4.1 Seismic qualification objective 4.2 Qualification levels Tables Table 1 – Seismic qualification levels for switchgear and controlgear assemblies –Horizontal severities
68	Table 2 – Comparison of qualification levels between various standards
69	Figures Figure 1 – Required response spectrum (RRS) for qualification level AG2.5 (ZPA = 0,25 g) Figure 2 – Required response spectrum (RRS) for qualification level AG5 (ZPA = 0,50 g)
70	4.3 Selection of seismic qualification level 4.3.1 General 4.3.2 Estimation of site-specific seismic hazard level Figure 3 – Required response spectrum (RRS) for qualification level AG10 (ZPA = 1,00 g)
71	4.3.3 Effect of building response and elevation 4.3.4 Soil-structure interaction 5 Qualification by test 5.1 General
72	5.2 Mounting 5.3 Test parameters 5.3.1 Measurements 5.3.2 Frequency range
73	5.3.3 Parameters for resonant frequency search 5.3.4 Parameters for time history test (seismic load test) 5.4 Testing procedure 5.4.1 General 5.4.2 Inspection and functional checks
74	5.4.3 Resonant frequency search 5.4.4 Time history test (seismic load test)
75	6 Qualification by combined test and numerical analysis 6.1 General 6.2 Dynamic and functional data
76	6.3 Numerical analysis 6.3.1 General 6.3.2 Analytical earthquake component combination techniques
77	6.3.3 Static analysis for rigid equipment 6.3.4 Static coefficient analysis 6.3.5 Dynamic response spectrum analysis
78	6.3.6 Time history analysis 6.4 Analysis by experience or similarity
79	7 Evaluation of the seismic qualification 7.1 Combination of loads and stresses
80	7.2 Validity criteria for the seismic waveform and the seismic test 7.3 Structural and functional evaluation of the test results 7.3.1 Common criteria for HV switchgear and MV switchgear 7.3.2 HV switchgear
81	7.3.3 MV switchgear 7.4 Allowable stresses 7.5 Criteria of model acceptance 7.6 Acceptance criteria of the analysis results by similarity
82	8 Documentation 8.1 Test report 8.2 Analysis report
83	Table 3 – Summary of maximum stresses, loads etc.
84	8.3 Analysis report when analysis is performed by similarity Table 4 – Example of summary of maximum stresses, loads etc.
85	Annex A (normative)Characterisation of the test-set A.1 Low-level excitation A.1.1 General A.1.2 Test method A.1.3 Analysis A.2 Determination of the damping ratio by testing A.2.1 General A.2.2 Determination of the damping ratio by free oscillation test
86	Figure A.1 – Monogram for the determination of equivalent damping ratio
87	A.2.3 Determination of the damping ratio by measuring the half-power bandwidth A.2.4 Determination of the damping ratio by curve fitting to frequency response methods A.2.5 Determination of the damping ratio by time domain curve fitting
88	Annex B (informative)Criteria for seismic adequacy of enclosed switchgearand controlgear assemblies B.1 General B.2 Foundations B.3 Methods for anchoring equipment to foundations
89	B.4 Interconnection to adjacent equipment B.5 Use of bracings on switchgear structure
90	Annex C (informative)Qualification process flowchart Figure C.1 – Qualification process flowchart
91	Bibliography

Status	Definitive
Pages	93
Publication Date	2024-01-04
ISBN	978 0 539 30004 8
Standard Number	BS EN IEC 62271-207:2023 – TC
Title	Tracked Changes. High-voltage switchgear and controlgear – Seismic qualification for gas-insulated switchgear assemblies, metal enclosed and solid-insulation enclosed switchgear for rated voltages above 1 kV
Descriptors	Electrical equipment, Earthquake-resistant design, Switchgear, Acceptance (approval), Indoor electric equipment, Rated voltage, High-voltage equipment, Gases, Outdoor electric equipment, Electrical protection equipment, Qualification approval, Seismic coefficient, Seismic loading, Approval testing, Electrical insulation, Electric control equipment
Publisher	BSI
Committee	PEL/17
ICS Codes	29.130.10 - High voltage switchgear and controlgear


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