IEC 62271-2:2003

FOREWORD
1 Scope and object
2 Normative references
3 Definitions
4 Seismic qualification requirements
  4.1 Preliminary analysis
5 Severities
6 Qualification by test
  6.1 Introduction
  6.2 Mounting
  6.3 External load
  6.4 Measurements
  6.5 Frequency range
  6.6 Test severity
  6.7 Testing
7 Qualification by combined test and analysis
  7.1 Introduction
  7.2 Vibrational and functional data
  7.3 Analysis
8 Evaluation of the seismic qualification
  8.1 Combination of stresses
  8.2 Acceptance criteria of the seismic test
  8.3 Functional evaluation of the test results
  8.4 Allowable stresses
9 Documentation
  9.1 Information for seismic qualification
  9.2 Test report
  9.3 Analysis report
Annex A (normative) - Characterization of the test-set
Annex B (informative) - Criteria for seismic adequacy of
                        gas-insulated metal-enclosed
                        switchgear
Bibliography
Figures
Tables

Applies to all switchgear and their assemblies for alternating current of rated voltages of 72,5 kV and above for indoor and outdoor installation, including their supporting structure rigidly connected to the ground.Where switchgear and their assemblies are not ground mounted, e.g. in a building, conditions for application are subject to agreement between users and manufacturers.The seismic qualification of the switchgear and their assemblies take into account any auxiliary and control equipment either directly mounted or as a separate structure. This standard provides procedures to seismically qualify ground mounted switchgear and their assemblies for rated voltages of 72,5 kV and above.The seismic qualification of the switchgear and their assemblies is only performed upon request.This standard specifies seismic severity levels and gives a choice of methods that may be applied to demonstrate the performance of high-voltage switchgear and their assemblies for which seismic qualification is required.