变压器空载电流谐波低频测量方法

发布时间：2018-02-16 01:44

本文关键词： 变压器空载电流谐波铁心损耗低频法涡流电流　出处：《电工技术学报》2017年22期 　论文类型：期刊论文

【摘要】：变压器空载电流谐波的幅值及成分可以检查铁心的饱和程度,并判断是否有匝间故障。变压器出厂试验时通常采用容量较大的工频电源进行空载电流谐波测量。为了减小试验电源容量,提出一种采用低频电源代替工频电源进行变压器空载电流谐波测量的低频测量法。该方法通过施加两个低频率的电压测量低频下的涡流电流和空载电流谐波幅值,再根据对涡流电流的补偿计算折算至工频下的空载电流各次谐波含量和总谐波含量。并对单相变压器进行仿真和试验验证,采用15Hz的折算结果与工频50H实测的空载电流各次谐波含量K(k)及总谐波含量THDi误差均小于1%。结果表明,所提方法折算准确度高,而且能成倍减小试验电源容量。
[Abstract]:The amplitude and composition of the harmonics of the transformer's no-load current can check the saturation degree of the iron core. In order to reduce the capacity of the test power supply, the power frequency power supply with large capacity is usually used to measure the harmonic current of the no-load power supply in order to reduce the capacity of the test power supply, and to determine whether there is a turn-to-turn fault or not. In this paper, a low frequency measurement method of transformer no-load current harmonic measurement using low-frequency power supply instead of power frequency power supply is proposed. The harmonic amplitude of eddy current and no-load current at low frequency is measured by applying two low-frequency voltages. Then, according to the compensation of eddy current, the harmonic content and total harmonic content of no-load current converted to power frequency are calculated, and the simulation and test of single-phase transformer are carried out. The conversion result of 15 Hz and the THDi error of the total harmonic content and the harmonic content of the no-load current measured at 50 H are all less than 1. The results show that the conversion accuracy of the proposed method is high and the capacity of the test power supply can be reduced exponentially.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【分类号】：TM41

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