一起35kV不接地系统单相弧光接地事故分析
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摘要
某220 kV变电站的35 kV不接地系统中,因单相接地故障引起的弧光接地过电压,导致滤波支路过流保护动作及多处设备损坏。阐述了事故的发生过程,分析了事故电压波形并找出现场故障原因。基于PSCAD/EMTDC软件建立了包含弧光接地故障的现场仿真模型,分析了间歇性弧光接地引起的过电压过程,仿真结果验证了该事故是由于间歇性弧光接地引起系统故障的分析,并提出了相应解决方案。
There was a single-phase ground fault of arc-earthing overvoltage causing filtering circuit over-current protective action which occurred in a 220 kV substation where the 35 kV system was non-effective grounded. Lots of equipments were damaged because of the non-continuous single-phase ground fault. This paper expounded the generating process of the accident, analyzed the accident voltage waveform and founded the field failure causes. The field simulation model including arc-earthing was established by using the common electromagnetic transient simulation software PSCAD/EMTDC. This paper analyzed the generating process of the overvoltage caused by the intermittent arc-earthing. The simulation results verify that this accident is caused by intermittent arc-earthing and the corresponding solution is proposed to avoid these incidents.
There was a single-phase ground fault of arc-earthing overvoltage causing filtering circuit over-current protective action which occurred in a 220 kV substation where the 35 kV system was non-effective grounded. Lots of equipments were damaged because of the non-continuous single-phase ground fault. This paper expounded the generating process of the accident, analyzed the accident voltage waveform and founded the field failure causes. The field simulation model including arc-earthing was established by using the common electromagnetic transient simulation software PSCAD/EMTDC. This paper analyzed the generating process of the overvoltage caused by the intermittent arc-earthing. The simulation results verify that this accident is caused by intermittent arc-earthing and the corresponding solution is proposed to avoid these incidents.
引文
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[2]陈筱平,刘雅洁,汪颖,等.某实际间歇性弧光接地事故仿真分析与对策研究[J].电力科学与工程,2012,28(9):10-17.
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[9]冯世涛,列剑平,郑良华,等.10 k V配电网系统弧光接地过电压研究[J].吉林电力,2010,38(5):5-8.
[10]夏国武,崔红.10 k V系统工频弧光接地过电压的研究[J].东北电力大学学报,2012,32(6):33-37.
[11]毛卫华.弧光接地过电压的危害及消弧措施[J].电气应用,2008,27(10):49-51.
[12]许颖.对消弧线圈“消除弧光接地过电压”的异议[J].电力设备,2001,26(4):48-50.
[13]靳晓东,李谦,王晓瑜,等.配电网弧光接地过电压的仿真及分析[J].高电压技术,1994,20(3):71-75.
[14]姜坛.弧光接地过电压及其限制措施[J].铜业工程,2006(4):43-46.
[15]陈慈萱.过电压保护原理与运行技术[M].北京:中国电力出版社,2001.
[16]焦瑾.铁磁谐振过电压事故及其防止(2)[J].江苏电机工程,1998,17(4):24-27.
[2]陈筱平,刘雅洁,汪颖,等.某实际间歇性弧光接地事故仿真分析与对策研究[J].电力科学与工程,2012,28(9):10-17.
[3]司马文霞,冉锐,袁涛,等.采用数学形态学的弧光接地过电压识别方法[J].高电压技术,2010,36(4):835-841.
[4]颜建国,平绍勋.弧光接地过电压的分析方法探讨[J].江苏电机工程,2012,31(2):62-64.
[5]平绍勋,周玉芳.电力系统中性点接地方式及运行分析[M].北京:中国电力出版社,2010.
[6]平绍勋.电力系统内部过电压保护及实例分析[M].北京:中国电力出版社,2006.
[7]JOHNS A T,AGGARWAL R K,SONG Y H.Improved techniques for modelling fault arcs on faulted EHV transmission systems[J].IEE ProceedingsGeneration,Transmission and Distribution,1994,141(2):148-154.
[8]韩爱芝,曾定文,鲁铁成.配电网间歇性电弧接地过电压的仿真分析与对策[J].高压电器,2010,46(1):72-75.
[9]冯世涛,列剑平,郑良华,等.10 k V配电网系统弧光接地过电压研究[J].吉林电力,2010,38(5):5-8.
[10]夏国武,崔红.10 k V系统工频弧光接地过电压的研究[J].东北电力大学学报,2012,32(6):33-37.
[11]毛卫华.弧光接地过电压的危害及消弧措施[J].电气应用,2008,27(10):49-51.
[12]许颖.对消弧线圈“消除弧光接地过电压”的异议[J].电力设备,2001,26(4):48-50.
[13]靳晓东,李谦,王晓瑜,等.配电网弧光接地过电压的仿真及分析[J].高电压技术,1994,20(3):71-75.
[14]姜坛.弧光接地过电压及其限制措施[J].铜业工程,2006(4):43-46.
[15]陈慈萱.过电压保护原理与运行技术[M].北京:中国电力出版社,2001.
[16]焦瑾.铁磁谐振过电压事故及其防止(2)[J].江苏电机工程,1998,17(4):24-27.