Abstract
As the core component of transformer voltage regulation, on-load tap changer plays an important role in ensuring voltage stability of power system. With the increase of times of voltage regulation, the failure rate also increases correspondingly. In view of the common faults of on-load tap changer, this paper introduces several existing fault diagnosis methods and summarizes their advantages and disadvantages. Finally, the problems in fault diagnosis of on-load tap-changer and the future research focus are analysed.
Highlights
An on-load tap-changer (OLTC) is an essential part of a power transformer
Since mechanical failure is the main fault of OLTC, and vibration signal contains a large amount of equipment status information, the mainstream method is based on the feature extraction of vibration signal
Ensemble empirical mode decomposition (EEMD) according to the statistical characteristics of Gaussian white noise, that is, a unified frequency distribution, white noise is added to the original signal, and it is subjected to multiple Empirical mode decomposition (EMD) decompositions
Summary
An on-load tap-changer (OLTC) is an essential part of a power transformer. It adjusts the output voltage of the transformer by changing the tap position to respond to changes in power generation and consumption. As an important voltage regulating equipment in the power system, the on-load tap-changer can automatically change the taps, adjust the transformation ratio, adjust the voltage and reduce the loss during the system operation, so it has been widely used. This article will summarize the research methods of OLTC fault diagnosis, and put forward the remaining problems and analysis of the links that can be broken
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