有载分接开关(On-load Tap changer, OLTC)在电

On-load tap changer (On-load Tap changer, OLTC) plays an important role in regulating reactive power and stabilizing the grid voltage in the power system. It is the key component and the only movable part of the on-load voltage regulating transformer. According to statistics, transformer failures caused by OLTC account for more than 20% of its total failures, and more than 90% of mechanical failures. In addition, the frequent voltage regulation operation of OLTC used in converter transformers of high-voltage DC transmission systems has higher requirements on its reliability. It is necessary to study a reasonable and effective OLTC mechanical feature extraction method to find hidden troubles in the operation of OLTC as early as The reliable operation of the transformer is of great significance.

有载分接开关(On-load Tap changer, OLTC)在电力系统中承担着调节无功功率、稳定电网电压的重要作用，是有载调压变压器的关键组成部分与唯一可动部件。据统计，OLTC引发的变压器故障占其总故障的20%以上，且机械故障90%以上。此外，高压直流输电系统换流变用OLTC的频繁调压操作等对其可靠性的要求更高，有必要研究合理有效的OLTC机械特征提取方法，及早发现OLTC运行过程中的故障隐患，对于保证变压器的可靠性运行具有重要意义。

On load tap changer (OLTC) plays an important role in regulating reactive power and stabilizing grid voltage in power system. It is the key component and the only movable part of on load tap changer. According to statistics, OLTC induced transformer faults account for more than 20% of its total faults, and mechanical faults account for more than 90%. In addition, the high-voltage direct current transmission system has higher requirements for its reliability, such as the frequent voltage regulation operation of OLTC for converter. It is necessary to study a reasonable and effective method of mechanical feature extraction of OLTC, and find the hidden trouble in the process of OLTC operation as early as possible, which is of great significance to ensure the reliable operation of transformer.<br>