干式空心并联电抗器开断过程中复燃过电压研究
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摘要
在35kV电力系统中采用真空断路器来开断电抗器引起复燃过电压,给电抗器的匝间绝缘造成破坏。基于上海某变电站实际电气主接线,构建投切35kV并联电抗器单相模型以及三相模型,计算出首开相产生的复燃过电压幅值为3.0(标么值)。根据后开相的过电压产生机理,计算出非工频电流过零相产生的过电压幅值为13.0(标么值),而在前两相均产生复燃的情况下,最后相产生的过电压幅值为16.6(标么值)。
In 35 kV power system,switching off the reactor by using the vacuum circuit breaker often leads to reburning overvoltage,which causes damage to the windings of the reactor.Based on the actual electrical wiring of a substation in Shanghai,the single-phase model and three-phase model of 35 kV shunt reactor are constructed,and the first of the phase-opening is calculated to be 3.0 p.u.According to the overvoltage generation mechanism of the rear-opening phase,the overvoltage amplitude generated by the phase of the non power frequency current is calculated as 13.0 p.u,and in the case of the former two-phase,the overvoltage amplitude generated by the final phase is a.16.6 p.u.
In 35 kV power system,switching off the reactor by using the vacuum circuit breaker often leads to reburning overvoltage,which causes damage to the windings of the reactor.Based on the actual electrical wiring of a substation in Shanghai,the single-phase model and three-phase model of 35 kV shunt reactor are constructed,and the first of the phase-opening is calculated to be 3.0 p.u.According to the overvoltage generation mechanism of the rear-opening phase,the overvoltage amplitude generated by the phase of the non power frequency current is calculated as 13.0 p.u,and in the case of the former two-phase,the overvoltage amplitude generated by the final phase is a.16.6 p.u.
引文
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[3]陈梁金,周国良,江少成.35kV空母线系统中真空断路器投切电抗器相关问题分析[J].高压电器,2010,46(9):103-106.HEN Liangjin,ZHOU Guoliang,JIANG Shaocheng.Analysis of the faults caused by vacuum circuit breaker switching to shunt reactors in a 35kV bus bar system[J].High Voltage Apparatus,2010,46(9):103-106.
[4]杜宁.40.5kV真空断路器开断并联电抗器过电压的研究[D].北京:清华大学,2010.
[5]施纪栋.真空断路器投切35kV并联电抗器的过电压仿真研究[D].杭州:浙江大学,2014.
[6]彭庆军,姜雄伟,司马文霞,等.真空断路器开断35kV并联电抗器的三相建模仿真与过电压抑制研究[J].高压电器,2017,53(3),148-159.
[7]时新燕.真空断路器投切并联电抗器过电压实例研究[J].华北电力技术,2005(6):5-8.Shi Yanxin.Research on vacuum circuit breaker switching shunt capacitor overvoltage[J].North China Electric Power,2005(6):5-8.