变压器空载电流谐波低频测量方法

doi:10.19595/j.cnki.1000-6753.tces.160905

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Abstract The magnitude and composition of transformers no-load current harmonics can be used to examine the saturation degree and detect the inter-turn faults. Generally, a large capacity of industrial-frequency (IF) power supply is used to measure the no-load current harmonics content in transformer factory test. In order to reduce the capacity of testing power supply, this paper proposed a method using low frequency power supply to replace IF power supply to measure no-load current harmonics of transformers. Two low-frequency voltages were first applied to obtain the eddy current and no-load current harmonics. The converted current harmonics content and total harmonics distortion (THD_i) under IF were then calculated based on eddy current compensation. In addition, the experiments and simulations were conducted on a single-phase power transformer. Compared with the conversion results of 15Hz, the errors of harmonics content and THD_i directly measured under IF are both below 1%. It is shown that this method has high conversion accuracy and can significantly reduce the capacity of testing power supply.

Key words： Transformer, no-load current harmonics, core loss, low-frequency method, eddy current

Received: 16 June 2016 Published: 05 December 2017

PACS:	TM416
	TM930.1

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	Articles by authors
	Yao Chenguo
	Liu Xin
	Hu Di
	Wan Jialun
	Wang Junkai

Cite this article:

Yao Chenguo,Liu Xin,Hu Di等. No-Load Current Harmonics Measurement of Transformers Using Low-Frequency Method[J]. Transactions of China Electrotechnical Society, 2017, 32(22): 115-21.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160905 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I22/115

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