Overvoltages on five legged core transformers on rural electric systems

6 January 2003

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. D3/1-D3/6
https://doi.org/10.1109/repcon.1988.11007

Abstract

Five-legged-core, grounded-wye-grounded-wye, three-phase transformers can cause overvoltage conditions on an open phase when the primary is cable fed and single-phase switched. Field and laboratory test results on the overvoltage condition are given. An equivalent circuit of the transformer is evaluated and used to simulate laboratory and field test conditions. Techniques to minimize the overvoltage condition are discussed.

Keywords

SURGES
TRANSFORMER CORES
POWER CABLES
FERRORESONANCE
IEEE MEMBERS
CIRCUIT TESTING
NEODYMIUM
VOLTAGE
POWER TRANSFORMER INSULATION
POWER SYSTEMS

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