IEC 61166:1993

Foreword
Clause
1 Scope and object
2 Normative references
3 Definitions
4 Seismic qualification requirements
5 Severities
6 Qualification by test
   6.1 Introduction
   6.2 Mounting
   6.3 External load
   6.4 Measurement
   6.5 Frequency range
   6.6 Test severity
        6.6.1 Parameters for sine-beat excitation
        6.6.2 Parameters for time-history excitation
   6.7 Testing
        6.7.1 Test directions
        6.7.2 Test sequence
7 Qualification by combined test and analysis
   7.1 Introduction
   7.2 Vibrational and functional data
   7.3 Analysis
        7.3.1 Acceleration time-history method of
               calculation
        7.3.2 Modal analysis using the required response
               spectrum (RRS)
        7.3.3 Static coefficient analysis
8 Evaluation of the seismic qualification
   8.1 Combination of stresses
   8.2 Acceptance criteria of the seismic simulation
   8.3 Functional evaluation of the test results
9 Documentation
   9.1 Information for seismic qualification
   9.2 Test report
   9.3 Analysis report
Figures
Annex
A Characterization of the equipment

Specifies seismic severity levels and gives a choice of methods that can be applied to demonstrate the performance of HV circuit-breakers for which seismic qualification is required.