基于EMTP/ATP的220 kV变压器非全相运行故障分析
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摘要
以四川电网某220 k V变电站主变压器非全相运行故障为契机,基于变压器非全相运行时各侧电压相量的理论分析,利用电磁暂态软件EMTP/ATP进行仿真计算分析,合理推断了主变压器非全相运行故障的原因,对理清变压器非全相运行故障机理和防止该类故障具有重要意义。计算结果表明:主变压器低压侧避雷器烧坏是由高压侧中性点接地刀闸拉开时在低压侧产生的周期性励磁涌流过电压引起的,但该操作不会导致高压侧出现过电压,高压侧避雷器动作是由于充电试验中断路器非全相合闸造成的。
Taking the open- phase operation fault of main transformer in a 220 k V substation of Sichuan power grid as an opportunity,based on the analysis of voltage vector in each side when the transformer is in open- phase operation,the simulation and calculation are carried out with EMTP/ATP,the reasons for open- phase operation fault of main transformer are deduced,which is of great significance for clearing the mechanism of open- phase operation fault of transformer and avoiding from this kind of fault. The calculation results show that because of the periodic excitation inrush current overvoltage in low-voltage side which is generated by the opening of neutral point disconnector in high- voltage side,the arrester in low- voltage side of main transformer burns out,but this operation will not generate overvoltage in high- voltage side,the action of the arrester in high- voltage side are caused by the open- phase closing of circuit breaker in the charging tests.
Taking the open- phase operation fault of main transformer in a 220 k V substation of Sichuan power grid as an opportunity,based on the analysis of voltage vector in each side when the transformer is in open- phase operation,the simulation and calculation are carried out with EMTP/ATP,the reasons for open- phase operation fault of main transformer are deduced,which is of great significance for clearing the mechanism of open- phase operation fault of transformer and avoiding from this kind of fault. The calculation results show that because of the periodic excitation inrush current overvoltage in low-voltage side which is generated by the opening of neutral point disconnector in high- voltage side,the arrester in low- voltage side of main transformer burns out,but this operation will not generate overvoltage in high- voltage side,the action of the arrester in high- voltage side are caused by the open- phase closing of circuit breaker in the charging tests.
引文
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[20]张科,马歆,刘祖军,等.SF6断路器投切500 k V空载变压器试验分析[J].高压电器,2002,38(2):37-39.
[21]蔡百凌,陈葛松.合空载变压器谐振过电压的探讨析[J].华中电力,2006,19(2):8-10.
[2]屈刚,李长凯,孙林,等.配电变压器非全相运行时各侧相量分析[J].华中电力,2006,19(3):16-18.
[3]孟恒信,张德宏,莫丽珍.电力负荷变压器非全相运行分析[J].山西电力,2007(4):14-17.
[4]关建明.发电机变压器组的非全相运行与保护[J].湖北电力,2003,27(5):7-11.
[5]李富春,李建兵.基于EMTP/ATP的变压器建模及励磁涌流的仿真研究[J].电气开关,2003(4):48-50.
[6]孙会浩,刘玉林,吴磊,等.基于EMTP/ATP的变压器建模及仿真[J].电气应用,2008,27(8):46-49.
[7]王晓彤,施围.BP算法在磁化曲线拟合中的应用[J].西安交通大学学报,1998,32(8):1-4.
[8]王晓彤,范越,施围.变压器励磁特性的修正BP模型[J].西安交通大学学报,2001,35(2):111-115.
[9]王天施,王清昊,苑舜,等.220 k V主变10 k V侧空载时避雷器的选择[J].电瓷避雷器,2012(2):86-90.
[10]戚革庆,李维成,文习山.一起220 k V主变10 k V侧避雷器的损坏原因[J].高电压技术,2008,34(5):1085-1086.
[11]熊泰昌.电力避雷器[M].北京:中国水利水电出版社,2013.
[12]鲁铁成.电力系统过电压[M].北京:中国水利水电出版社,2009.
[13]李山.基于EMTPE的750 k V空载变压器励磁涌流仿真研究[J].高压电器,2013(1):101-102.
[14]陈珍珍,林集明.EMTP/EMTPE使用说明[R].北京:中国电力科学研究院,2009.
[15]林集明,王晓刚,班连庚,等.特高压空载变压器的合闸谐振过电压[J].电网技术,2007,31(2):6-8.
[16]李振强,谷定燮,戴敏,等.特高压空载变压器谐振过电压和励磁涌流分析及抑制方法[J].高电压技术,2012,38(2):387-390.
[17]王燕,皇甫成,赵淑珍,等.考虑铁磁磁滞的变压器励磁涌流仿真分析[J].电力系统自动化,2009,33(15):80-82.
[18]郝治国,张保会,褚云龙,等.变压器空载合闸励磁涌流抑制技术研究[J].高压电器,2005,41(2):81-84.
[19]董宏林,张立国,杜迎辉,等.变压器几起冲击合闸故障分析[J].变压器,2007,44(10):47-49.
[20]张科,马歆,刘祖军,等.SF6断路器投切500 k V空载变压器试验分析[J].高压电器,2002,38(2):37-39.
[21]蔡百凌,陈葛松.合空载变压器谐振过电压的探讨析[J].华中电力,2006,19(2):8-10.