NBN EN 61166 : 1995

Cooperating organizations
National foreword
Foreword
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
Annexes
A Characterization of the equipment
ZA (normative) Other international publications
       quoted in this standard with the references of
       the relevant European publications
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

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. Applies to ground mounted high voltage (HV) circuit breakers. Does not cover the seismic qualification of circuit breakers in metal enclosed switchgear. Coverage includes definitions and severities.