电磁式电压互感器“低频过电压激励-响应”逆问题求解

doi:10.19595/j.cnki.1000-6753.tces.201469

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Abstract Electromagnetic potential transformer（PT）is a piece of critical voltage measurement equipment widely used in power systems. However, low-frequency electromagnetic transient voltages may excite the core of PT to be saturated, resulting in a significant increase in measurement error. By solving the inverse problem of “low-frequency overvoltage excitation to response” of PT, its primary excitation voltage can be calculated based on the secondary response voltage. Based on the principle of electromagnetic duality, a forward circuit model considering the deep saturation of the iron core and its parameters extraction method are proposed in this paper, then an inverse mathematical model is constructed, which solves the inverse problem of “low-frequency overvoltage excitation to response” of PT. The proposed method is validated by simulations and experiments on a 10kV PT. Results show that the proposed method can significantly decrease the error of the PT from 65.6% to 10%, when it suffers from deep saturation caused by low-frequency transients. The proposed method solves the problem of distortion of the secondary voltage of the PT under the excitation of low-frequency transients.

Key words： Electromagnetic potential transformer low-frequency transient voltage deep saturation characteristics inverse problem solving

Received: 01 November 2020

PACS:	TM451+.1
	TM835.1

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	Articles by authors
	Yang Ming
	Xiong Zhao
	Sima Wenxia
	Li Yongfu
	He Dongsheng
	Zou Binyang

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Yang Ming,Xiong Zhao,Sima Wenxia等. Solution of the Inverse Problem of “Low-Frequency Overvoltage Excitation to Response” for Electromagnetic Potential Transformers[J]. Transactions of China Electrotechnical Society, 2021, 36(17): 3605-3613.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201469 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I17/3605

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