Earthquake Resistant Design Of A Transformer
Author(s)
A. D. Shendge
Abstract
The safety of the transformer and the environment around the plant should be
ensured against all natural hazards including earthquakes. With public safety as
the paramount concern, the transformer is designed to withstand low probability
high magnitude earthquakes. This paper deals with seismic design aspects of a
50MVA, 110KV power transformer such as the ground motion generation,
seismic analysis and earthquake qualification, etc. The finite element analysis
tool has been used to carry out modal analysis and spectrum (mode combination)
analysis. Spectral analysis is used to combine the effect of the structure’s modes
on one of the equipment modes and, also, combine the effect of equipment
modes with respect to stresses or displacements in the equipment modes of the
structure
Keywords: earthquake, transformer, seismic design, dynamic analysis, response
spectrum, and finite element analysis.
1 Introduction
A transformer consists of various structures, which are designed to resist
earthquake forces. Earthquake is a natural phenomenon, which is generated in
earth crust in the form of seismic waves, generating ground vibrations travelling
far and wide and gets attenuated as they travel. Such ground vibrations or base
motion at the base of the transformer [Fig.1] gets transmitted through the under
base of the transformer to the structure such as core, coil, conservator, radiator,
bushing and tank mounted lightning arrestor. The earthquake motion mainly
induces inertial forces in the structure. The Transformer structure is designed to
resist these earthquake forces along with other loads, viz. Gravity, pressure, wind
load pull and thermal loads etc. The detailed seismic requirement [1] for each
component, including whether it is required to operate after an earthquake, or
Keywords
earthquake, transformer, seismic design, dynamic analysis, response
spectrum, and finite element analysis.
Related Book
Other papers in this volume
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