基于磁化曲線的分段式變壓器勵(lì)磁電感等效方法研究
董宇1,段強(qiáng)2,董韜3,于雯斐1
(1 鄭州輕工業(yè)學(xué)院 電氣信息工程學(xué)院,河南 鄭州 450002;
2 國網(wǎng)新鄉(xiāng)供電公司,河南 新鄉(xiāng) 453000;3 國網(wǎng)邯鄲供電公司,河北 邯鄲 056000)
摘 要:提出一種基于磁化曲線的分段式變壓器勵(lì)磁電感的等效方法。分析了傳統(tǒng)線性化基本磁化曲線中變壓器勵(lì)磁電感等效為線性定值的弊端;采用分段表達(dá)式方法,根據(jù)每段不同特點(diǎn)設(shè)置不同的數(shù)學(xué)表達(dá)式,找到勵(lì)磁電感隨時(shí)間的變化關(guān)系。仿真結(jié)果表明,該法準(zhǔn)確地描述了變壓器飽和時(shí)勵(lì)磁電感的變化情況,為變壓器勵(lì)磁涌流識別及差動(dòng)保護(hù)原理的拓展提供了參考。
關(guān)鍵詞:磁化曲線;勵(lì)磁電感;分段表達(dá);變壓器
中圖分類號:TM401+.1 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2016)09-0016-03
Research of Segmentary Transformer Excitation Inductance Equivalent Method Based on Magnetizing Curve
DONG Yu1, DUAN Qiang2, DONG Tao3, YU Wen-fei1
(1 College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;
2 State Grid Xinxiang Power Supply Company, Xinxiang 453000, China;
3 State Grid Handan Power Supply Company, Handan 056000, China)
Abstract: This paper proposed a segmentary transformer excitation inductance equivalent method based on the magnetization curves. Analysis was made to the disadvantages that the transformer excitation inductance was equivalent to the fixed linear constant value in the traditional linear basic magnetization curves. According to the characteristics of each different mathematical expression, with the segmentary expression method, this paper revealed the relationship between excitation inductance and the time. The simulation results show that this method could describe the transformer magnetization curves accurately, to provide references for the transformer excitation surge current and the differential protection principle expansion.
Key words: magnetizing curve; excitation inductance; subsection expression; transformer
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