特高压有载调压变压器差动保护自适应算法

doi:10.19595/j.cnki.1000-6753.tces.160288

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Abstract On-load voltage regulation technology has been successfully applied in the ultra-high voltage (UHV) transmission system, leading to a higher requirement for operating reliability of the UHV transformer. During on-load voltage regulating process, it is impossible to adjust the balance coefficient since the actual tap position of the voltage-regulating transformer (VRT) is unavailable for the protection relay. Thus, a fixed ratio is chosen to calculate the differential current, which may probably exist great errors. In practical engineering, the insensitive differential protection is added to avoid the unbalanced current caused by voltage regulation, which increases the complexity of the field operation and decreases the sensitivity of the relay action. Thus, this paper proposes a new method to identify the online tap position adaptively based on the structure of the UHV transformer. The differential current is modified by calculating the online ratio of the VRT to obtain the accurate value during online voltage-regulating process. Digital simulations have demonstrated that the percentage of short-circuit turns and the online tap position have little effect on the operating characteristic of the adaptive differential protection. The sensitivity deficiency of the existing protection strategy is effectively solved during the turn-to-turn faults.

Key words： Ultra-high voltage (UHV) voltage-regulating transformer (VRT) on-load voltage regulation differential protection adaption turn-to-turn fault

Received: 07 March 2016 Published: 30 October 2017

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TM406

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	Zheng Tao
	Lu Geye
	Huang Ting
	Zhao Yanjie
	Liu Lianguang

Cite this article:

Zheng Tao,Lu Geye,Huang Ting等. An Adaptive Algorithm for the Differential Protection of the UHV Voltage-Regulating Transformer with On-Load Tap Changer[J]. Transactions of China Electrotechnical Society, 2017, 32(20): 271-280.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160288 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I20/271

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