电容隔直可控开断桥法抑制变压器直流偏磁

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Abstract The enormous ground return current caused by HVDC system’s mono-pole ground return operation mode will result in transformers nearby DC biasing . This paper provides a new circuit topology of a neutral blocking DC capacitor controllable opening and broken bridge for suppressing DC biasing. Compared with the traditional blocking capacitor circuit, the increasing ratio of the fault current just after the occurrence of a fault is limited by a DC limiting reactor, which is instantaneous automatic input without control system response. As a result, it avoids the transient current shock to damage the capacitor. This method ensures neutral point effective grounding. Meanwhile, the control system has adequate response time to switch working modes. The structure of the equivalent circuit, and the analytical results of the voltage and current and are given in detail. In addition, the selected bases for parameters of capacitor are also provided. Using PSCAD/EMTDC software, it comparative analyses that the effect of suppressing transient impulse current with or without adding blocking DC device under fault conditions. A blocking device prototype with low-power is established and experimentally investigated. Results prove its validity and practicability.

Key words： Transformer DC magnetic bias capacitor topological structure short-circuit fault transient protection

Received: 20 May 2013 Published: 25 March 2014

PACS:

TM315

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	Wang Zhenhao
	Tong Xin
	Qi Weifu

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Wang Zhenhao,Tong Xin,Qi Weifu. Blocking DC Capacitor Controllable Opening and Broken Bridge Suppression in Transformer DC Magnetic Bias[J]. Transactions of China Electrotechnical Society, 2013, 28(10): 120-126.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I10/120

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