A Review of Fault Diagnosis Research on On-Load Tap-Changers

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.

Analysis of the number of switches of on-load tap changer of a power transformer for field substation, taking into account discrete time and voltage level sampling

“…They are used to regulate the voltage level and maintain the voltage at the typical points of power supply system within the permissible limits in accordance with the Russian State Standard GOST 32144-2013. It should be noted that when determining the optimal voltage level and during its automated stabilization using the power transformer of the field substation, it is important to analyze the operating mode of the on-load tap-changer [12]. Exceeding the number of OLTC switches per day results not only in failure of the tap-changer itself, but also in the subsequent repair of transformer.…”