基于漏感辨识的变压器交直流混合运行保护方法

doi:10.19595/j.cnki.1000-6753.tces.161385

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Abstract In this paper, the protection strategy is researched based on electromagnetic coupling mechanism for DC-biased transformer. The circuit equation of transformer is established with DC disturbance. Combined with the time-domain difference principle of port-measured information, the identification method of dynamic leakage inductance is studied. On this basis, the protection criterion is proposed considering the DC disturbance. By using time-domain field-circuit coupling method, the electromagnetic characteristics of transformer are analyzed under different operation situations. The abnormal features of the DC-biased transformer are characterized by the key electromagnetic parameters such as exciting current, dynamic inductance and leakage inductance. Then the fluctuations of the key parameters are summarized, and the changing regulation is hence concluded. With dynamic model test platform set, the applicability of different criteria is studied under different DC levels. The DC-disturbance protection principle of transformer is presented based on the single-side leakage inductance parameter identification. The accuracy and feasibility of the proposed method is verified by simulation analysis and dynamic model experiment.

Key words： Transformer protection DC disturbance dynamic inductance time-domain difference

Received: 24 August 2016 Published: 05 March 2018

PACS:	TM41
	TM403.5

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	Pan Chao
	Jin Mingquan
	Cai Guowei
	Zhao Chunfang

Cite this article:

Pan Chao,Jin Mingquan,Cai Guowei等. Protection for Transformer in AC-DC Hybrid Operation Mode Based on Leakage Inductance Identification[J]. Transactions of China Electrotechnical Society, 2018, 33(4): 771-780.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161385 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I4/771

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