高壓容性開合直接試驗的參數(shù)計算方法
張玲1,2,汪海波1,2,胡冠1,2,陳明亮1,2,洪深1,2,陳勇1,2
(1 國網(wǎng)電力科學研究院有限公司, 江蘇 南京 211000;2 國網(wǎng)電科院檢測認證技術有限公司, 江蘇 常州 213000)
摘 要:研究了高壓交流斷路器電容器組開合直接試驗的回路參數(shù)計算方法。針對單個電容器組開合直接試驗,通過對電壓進行標幺值化并結合二階電路解析計算和Zeroin數(shù)值算法的計算方法,計算不同振幅系數(shù)下的系數(shù)K,從而計算調頻支路參數(shù),使恢復電壓起始部分的包絡線滿足標準要求,計算結果精確,不需要人為調整。針對背靠背電容器組開合直接試驗,建立了關于涌流頻率、開斷電流、標準恢復電壓以及回路原理的方程組,并在計算過程中使用了等效寄生電感L 的初始值計算公式和涌流阻尼電阻計算公式,縮短計算時間且使解得的參數(shù)同時滿足涌流頻率、涌流峰值、阻尼系數(shù)和標準恢復電壓的要求。
關鍵詞:大容量試驗室;容性開合;電容器組;涌流;數(shù)值算法
中圖分類號:TM53 ;TM561 文獻標識碼:A 文章編號:1007-3175(2021)03-0052-06
Parameter Calculation Method of High Voltage Capacitor Bank Switching Direct Test
ZHANG Ling1,2, WANG Hai-bo1,2, HU Guan1,2, CHEN Ming-liang1,2, HONG Shen1,2, CHEN Yong1,2
(1 State Grid Electric Power Research Institute, Nanjing 211000, China;
2 State Grid Power Testing and Certification Technology Co., Ltd, Changzhou 213000, China)
Abstract: This paper studies the calculation method of test circuit parameters for direct test of capacitor bank switching of high-voltage AC circuit-breaker. For single capacitor bank switching test, this paper calculates the coefficient K under different amplitude factor to calculate the parameters of frequency modulation branch by the method of combining analytical calculation of second-order circuit and Zeroin numerical algorithm in per unit. With this method, the envelope of the initial part of the recovery voltage can meet the requirements of the standard. The calculation result is accurate and do not need to be adjusted manually. For back to back capacitor bank switching test, this paper establishes equations of inrush current frequency, switching current, standard recovery voltage and circuit principle so as to obtain the test parameters which can meet requirements of inrush current frequency, inrush current peak value, damping coefficient and standard recovery voltage simultaneously. Calculation formulas of initial value of equivalent parasitic inductance L and inrush damping resistance are used to shorten calculation time and make the parameters obtained meet the requirements of inrush current frequency, inrush current peak value, damping factor and standard recovery voltage.
Key words: high power laboratory; capacitive current switching; capacitor bank; inrush current; numerical algorithm
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