110kV变阻抗变压器短路电流首峰值限制方法

doi:10.19595/j.cnki.1000-6753.tces.L90546

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Abstract The fist peak limit method of short-circuit current of 110kV variable impedance transformer (VIT) is studied. In case of short-circuit, the fast vacuum circuit breaker (FVCB) is interrupted in the short-circuit current rising stage through artificial zero-crossing circuit, so that the short-circuit current flows through the built-in current-limiting reactor (in series with the high-voltage winding) and therefore be limited. The relationship between the first peak value of 110kV VIT short-circuit current and the voltage phase angle at the moment of short circuit is simulated. The results show that it is necessary to limit the short-circuit current only when the phase angle is in the intervals of [-180°, -120°], [-60°, 60°] and [120°, 180°],and the FVCB opening time and short-circuit fault identification algorithm time meet the requirements of current limiting scheme. After the FVCB be interrupted, the short-circuit current of the VIT winding will continue to increase. By triggering the artificial zero-crossing branch in advance and reducing the capacitance of the artificial zero-crossing circuit’s capacitor, the first peak value of the short-circuit current of the VIT can be limited to the same level as that of maintaining the FVCB open state. The current limiting scheme can be verified by large current test loop, which is more stringent in testing the breaking capacity of FVCB than the actual transformer outlet short-circuit.

Key words： Variable impedance transformer short-circuit current fast vacuum circuit breaker artificial zero-crossing

Received: 06 August 2020

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TM418

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	Ma Kui
	Wang Shuhong
	Yao Xiaofei

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Ma Kui,Wang Shuhong,Yao Xiaofei. Limiting Method of First Peak of Short-Circuit Current of 110kV Variable Impedance Transformer[J]. Transactions of China Electrotechnical Society, 2021, 36(zk2): 723-729.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90546 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/Izk2/723

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