变压器三角绕组环流助增作用分析及其工程求取方法

doi:10.19595/j.cnki.1000-6753.tces.190266

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Abstract The helping effect of circulating current in the delta winding of Y-D-connected transformer will cause the primary inrush current to be distorted, and the reliability of the inrush current restraint criterion based on the typical characteristics of magnetizing inrush current will be affected. The generating mechanism, the helping effect and the influencing factors of the circulating current were revealed through the differential equation and mechanism analysis. It shows that the primary current of unsaturated phase is equal to the circulating current. Based on this, it was proposed to use the intermediate value of the three-phase primary inrush current as quasi circulating current instead of the actual circulating current to compensate the primary inrush current, so that the primary inrush current will have typical characteristics of magnetizing inrush current and will be more easily identified. The adaptability analysis of the method in the presence of remanence shows that it has good engineering practicability. The method has nothing to do with the grounding mode, and does not require the system voltage to be balance or symmetrical. Simulations and recorded waveforms have verified the effectiveness of the method.

Key words： Delta winding circulating current helping effect quasi circulating current engineering practicability

Received: 15 March 2019

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TM77

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	Cao Wenbin
	Yin Xianggen
	Zhang Zhe
	Wang Yuxue
	Pan Yuanlin

Cite this article:

Cao Wenbin,Yin Xianggen,Zhang Zhe等. Analysis of the Helping Effect and Engineering Calculation Method for Transformer Circulating Current in Delta Winding[J]. Transactions of China Electrotechnical Society, 2020, 35(15): 3161-3172.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190266 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I15/3161

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