Original scientific paper
https://doi.org/10.37798/202069340
Overvoltages and Transients Identification In On-line Bushing Monitoring
Wieslaw Gil
; Mikronika sp. z o.o. Poznań, Poland
Wiktor Masłowski
; Mikronika sp. z o.o. Poznań, Poland
Przemysław Wronek
; Mikronika sp. z o.o. Poznań, Poland
Abstract
Overvoltages and transients are sometimes recognized as the cause of bushings’ rapid failure. This fact is confirmed
by the studies published at the 2018 CIGRE session. They can also initiate dangerous resonance phenomena in transformer
windings. The identification of very fast overvoltages characterized by high dynamics of voltage changes, so-called "transients",
is difficult due to the limited frequency response of station voltage transformers. However, the bushing monitoring systems,
based on the so-called "voltage method" can be used for this purpose successfully. There are several running bushing
monitoring systems based on this method in Poland. The transients’ events are registered together with their oscillographs
in Transformer Monitoring Systems (TMS). The overvoltage statistics are also performed to support service procedures.
The TMS are integrated with station systems, which greatly increases the possibility of overvoltages’ phenomena analyzing.
Keywords
transients, overvoltages, on-line bushing monitoring, voltage method
Hrčak ID:
247125
URI
Publication date:
30.6.2020.
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