基于极性变化直流电压源的铁磁元件铁心剩磁通测量方法

doi:10.19595/j.cnki.1000-6753.tces.151972

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Abstract Residual flux may cause strong inrush current on transformers and affect measuring accuracy of current transformer (CT). Nowadays, measurement of residual flux of transformer core, however, is not standardized. Owing to the convenience of residual flux measurement, alternating polarity DC voltage source, which is used for characterizing residual flux and magnetic remanence coefficient of ferromagnetic core, is demonstrated in this paper. By applying alternating polarity DC voltage generated by half-bridge circuit on windings, negative and positive saturation points of ferromagnetic core are reached, respectively. The saturated part of hysteresis loop is obtained via plotting magnetic flux-current curve during the whole process. Residual flux and magnetic remanence coefficient are then calculated based on the obtained hysteresis loop. In addition, investigation was conducted on the current transformer, and residual flux was measured on positive and negative saturation points along with zero flux point. The average values are 4.001mWb, -3.844mWb and 0.048mWb, respectively. These results show high accuracy and stability of this method. Besides, the rated power of demagnetization voltage source is low which makes the demagnetization devices more portable.

Key words： Residual flux remanence coefficient inrush current measuring of residual flux hysteresis loop

Received: 07 December 2015 Published: 19 July 2017

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TM452

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	Liu Tao
	Liu Xin
	Liang Shibin
	Wang Junkai
	Yao Chenguo

Cite this article:

Liu Tao,Liu Xin,Liang Shibin等. Residual Flux Measuring Method on the Core of Ferromagnetic Components Based on Alternating Polarity DC Voltage Source[J]. Transactions of China Electrotechnical Society, 2017, 32(13): 137-144.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.151972 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I13/137

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