空载变压器最佳投切相位的研究
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摘要
为了确定能有效抑制空载变压器合闸励磁涌流与分闸过电压的最佳投切相位,首先分析了空载变压器合闸涌流及分闸过电压的产生机理;其次考虑断路器绝缘特性和机械分散性提出了空载变压器最佳目标关合相位的计算方法及最佳分闸相位的确定条件;最后搭建试验平台进行大量的分闸测量剩磁试验确定了实际最佳投切相位,在该相位进行的选相投切试验结果表明励磁涌流和过电压得到有效抑制,验证了最佳投切相位的有效性,为空载变压器投切提供了参考依据。
In order to investigate the optimal switching phase for eliminating the inrush current and breaking overvoltage,the principle of inrush currents and breaking overvoltage on unloaded transformer was analyzed firstly.Then considering insulation characteristics and deviation of the operating time of breaker,the calculation method for the optimal closing instant of controlled energizing transformers and the definite condition of optimal opening phase were given.Using physical experiment platform in laboratory,the residual flux measurement was obtained by controlled de-energization experiments,and the actual optimal switching phase was determined.The results of controlled switching experiments show that the inrush current and overvoltage can be eliminated effectively and verify the effectiveness of the optimal switching phase.This study provides a theoretic proofs for switching unloaded transformer.
In order to investigate the optimal switching phase for eliminating the inrush current and breaking overvoltage,the principle of inrush currents and breaking overvoltage on unloaded transformer was analyzed firstly.Then considering insulation characteristics and deviation of the operating time of breaker,the calculation method for the optimal closing instant of controlled energizing transformers and the definite condition of optimal opening phase were given.Using physical experiment platform in laboratory,the residual flux measurement was obtained by controlled de-energization experiments,and the actual optimal switching phase was determined.The results of controlled switching experiments show that the inrush current and overvoltage can be eliminated effectively and verify the effectiveness of the optimal switching phase.This study provides a theoretic proofs for switching unloaded transformer.
引文
[1]丁富华,邹积岩,方春恩,等.相控真空断路器投切空载变压器的应用研究[J].中国电机工程学报,2005,25(3):89-93.
[2]陈艳,陈小川,高仕斌.几种削减变压器励磁涌流的方法[J].高压电器,2005,41(4):282-285.
[3] Cardelli E,Faba A,Tissi F.Prediction and Control of Transformer Inrush Currents[J].IEEE Transactions on Magnetics,2015,51(3):1-4.
[4]何小庆,刘淑萍,李攀宏,等.一种消除单相变压器励磁涌流的预充磁策略[J].电力系统保护与控制,2014,41(17):120-124.
[5]丛伟,王伟旭,肖静,等.控制合闸电压幅值的变压器励磁涌流抑制方案[J].电力系统自动化,2017,41(8):159-165.
[6]黄金,梁兆庭.基于剩磁测量的选相关合技术[J].低压电器,2011(9):10-13,16.
[7]杨庆,张照辉,席世友,等.相控断路器投切10kV并联电容器的应用[J].高电压技术,2016,42(6):1 739-1 745.
[8] LI Wei,FANG Chun-en,ZHANG Bi-de,et al.Research on Controlled Switching in Reducing Unloaded Power Transformer Inrush Current Considering Circuit Breaker’s Prestrike Characteristics[C]//International Symposium on Discharges and Electrical Insulation in Vacuum.IEEE,2016:1-4.
[2]陈艳,陈小川,高仕斌.几种削减变压器励磁涌流的方法[J].高压电器,2005,41(4):282-285.
[3] Cardelli E,Faba A,Tissi F.Prediction and Control of Transformer Inrush Currents[J].IEEE Transactions on Magnetics,2015,51(3):1-4.
[4]何小庆,刘淑萍,李攀宏,等.一种消除单相变压器励磁涌流的预充磁策略[J].电力系统保护与控制,2014,41(17):120-124.
[5]丛伟,王伟旭,肖静,等.控制合闸电压幅值的变压器励磁涌流抑制方案[J].电力系统自动化,2017,41(8):159-165.
[6]黄金,梁兆庭.基于剩磁测量的选相关合技术[J].低压电器,2011(9):10-13,16.
[7]杨庆,张照辉,席世友,等.相控断路器投切10kV并联电容器的应用[J].高电压技术,2016,42(6):1 739-1 745.
[8] LI Wei,FANG Chun-en,ZHANG Bi-de,et al.Research on Controlled Switching in Reducing Unloaded Power Transformer Inrush Current Considering Circuit Breaker’s Prestrike Characteristics[C]//International Symposium on Discharges and Electrical Insulation in Vacuum.IEEE,2016:1-4.