IEC TS 61463:2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Methods of seismic qualification
6 Severities
7 Qualification by static calculation
8 Qualification by dynamic analysis
9 Qualification by vibration test
10 Evaluation of the seismic qualification
11 Necessary exchange of information
Annex A (informative) - Flow chart for seismic
        qualification
Annex B (informative) - Natural frequency and
        damping determination: Free oscillation
        test
Annex C (informative) - Static calculation method
        - Additional considerations
Annex D (informative) - Qualification by static
        calculation - Example on transformer
        bushing
Annex E (informative) - Center clamped bushings
Bibliography

IEC TS 61463:2016(E), which is a Technical Specification, is applicable to alternating current and direct current bushings for highest voltages above 52 kV (or with resonance frequencies placed inside the seismic response spectrum), mounted on transformers, other apparatus or buildings. For bushings with highest voltages less than or equal to 52 kV (or with resonance frequencies placed outside from the seismic response spectrum), due to their characteristics, seismic qualification is not used as far as construction practice and seismic construction practice comply with the state of the art. This document presents acceptable seismic qualification methods and requirements to demonstrate that a bushing can maintain its mechanical properties, insulate and carry current during and after an earthquake. The seismic qualification of a bushing is only performed upon request.