Original scientific paper

Study of Transient Interaction in a System with Transformer Supplied from Network through a Cable: Assessment of Interaction Frequencies and Resonance Evolvement

Vasily Larin ; All-Russian Electrotechnical Institute (VEI) Moscow, Russia
Daniil Matveev ; Moscow Power Engineering Institute (MPEI) Moscow, Russia
Alexey Volkov ; All-Russian Electrotechnical Institute (VEI) Moscow, Russia

Abstract

Transformer together with its windings is a complex oscillatory system. The interaction between
the transformer and an electric network during transients can cause the development of resonance
phenomenon in the windings leading to overvoltages and the risk of transformer fault.
This report presents the results of studies of resonance phenomena in transformer windings,
caused by interaction with an electric network containing the feeder cable. The approach to a simple
assessment of dominant oscillation frequency of a voltage in the system “feeder cable – transformer” and
estimation of the resonant frequencies of transformer winding is considered. The report also describes
the technique for measurement of winding resonance voltages. The resonance phenomenon evolvement
in transformer windings is considered and the impact of decaying oscillating applied voltage on maximum
ratio of resonance overvoltages is estimated.

Keywords

Transformer windings; resonance overvoltages; winding natural oscillation frequencies; frequency response analysis; FRA; voltage measurement in transformer windings

Hrčak ID:

199258

URI

https://hrcak.srce.hr/199258

Publication date:

15.8.2017.

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