变压器差动保护的P级电流互感器“同型”匹配方法
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摘要
为有效防止变压器区外故障时因各侧电流互感器饱和程度不一致引起的差动保护误动,基于电路、磁路分析,以变压器发生区外故障时各侧电流互感器同时进入饱和为原则,提出变压器差动保护中各侧P级电流互感器的"同型"匹配方案。该"同型"匹配方案可消除由变压器各侧电流互感器饱和程度不一致引起的不平衡电流,防止变压器发生区外故障时因电流互感器饱和引起的误动。利用所提方案得到了影响电流互感器"同型匹配"的因素。利用PSCAD/EMTDC进行了大量的仿真分析,验证了所提"同型"匹配方案的有效性。基于研究结果给出了变压器差动保护用电流互感器的选型建议。
Aiming at the misoperation of power transformer differential protection due to the saturation difference among the CTs(Current Transformers) of different sides during out-zone faults,a type-matching scheme is proposed for the P-class CTs at different sides of power-transformer differential protection,which,based on the analysis of electric and magnetic circuits,considers that the CTs at different sides enter saturation simultaneously as a principle to eliminate the unbalanced current caused by the saturation difference among the CTs of different sides and thus avoid the misoperation of power transformer differential protection during out-zone faults. The influencing factors of CT type-matching are attained. Numerous PSCAD/EMTDC simulations are carried out to verify the effectiveness of the proposed scheme and suggestions about CT type selection for power transformer differential protection are given based on the research results.
Aiming at the misoperation of power transformer differential protection due to the saturation difference among the CTs(Current Transformers) of different sides during out-zone faults,a type-matching scheme is proposed for the P-class CTs at different sides of power-transformer differential protection,which,based on the analysis of electric and magnetic circuits,considers that the CTs at different sides enter saturation simultaneously as a principle to eliminate the unbalanced current caused by the saturation difference among the CTs of different sides and thus avoid the misoperation of power transformer differential protection during out-zone faults. The influencing factors of CT type-matching are attained. Numerous PSCAD/EMTDC simulations are carried out to verify the effectiveness of the proposed scheme and suggestions about CT type selection for power transformer differential protection are given based on the research results.
引文
[1]朱声石.差动保护的暂态可靠性[J].继电器,2002,30(8):1-6.ZHU Shengshi.The transient reliability of differential protection[J].Relay,2002,30(8):1-6.
[2]余祥坤,吕艳萍,杨丽,等.与ECT混合用于差动保护的电磁型CT的校验方法[J].电网技术,2012,36(10):275-280.YU Xiangkun,L譈Yanping,YANG Li,et al.A verification method for electromagnetic current transformers mixedly applied in differential protection with electronic current transformers[J].Power System Technology,2012,36(10):275-280.
[3]殷伯云,罗志娟,杨丽,等.主变差动保护采用不同原理CT的仿真研究[J].电网技术,2013,37(1):281-286.YIN Boyun,LUO Zhijuan,YANG Li,et al.Simulation analysis of power transformer differential protection adopting current transformers based on different principles[J].Power System Technology,2013,37(1):281-286.
[4]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[5]王维俭.电气主设备继电保护原理与应用[M].北京:中国电力出版杜,1996:53-109.
[6]刘春艳,周多思.保护用电流互感器的特性检测及应用分析[J].电力系统保护与控制,2008,36(15):94-98,102.LIU Chunyan,ZHOU Duosi.Characteristic test and application analysis of protection’s CT[J].Power System Protection and Control,2008,36(15):94-98,102.
[7]朱声石.差动保护采用P级电流互感器的问题[J].继电器,2000,28(7):4-7.ZHU Shengshi.Differential protection using class P current transformer[J].Relay,2000,28(7):4-7.
[8]陶军,白全新,辛东昊,等.继电保护用P级电流互感器性能评估方法[J].内蒙古电力技术,2010,28(4):17-20.TAO Jun,BAI Quanxin,XIN Donghao,et al.Performance appraisal procedure of P class current transformer[J].Inner Mongolia Electric Power,2010,28(4):17-20.
[9]张保会,尹项根.电力系统继电保护[M].北京:中国电力出版社,2010.
[10]李秉宇,郝晓光.保护用电流互感器励磁特性测试及误差校核[J].电力自动化设备,2011,31(1):146-149.LI Bingyu,HAO Xiaoguang.Excitation characteristics test and error checkout for protective CT[J].Electric Power Automation Equipment,2011,31(1):146-149.
[11]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南[M].北京:中国电力出版社,2003.
[12]任先文,徐宏雷,孙楷淇,等.非周期分量对电流互感器饱和特性的影响的仿真[J].电力系统保护与控制,2009,37(5):6-9.REN Xianwen,XU Honglei,SUN Kaiqi,et al.Simulation of influence of current transformer saturation characteristic by aperiodic current[J].Power System Protection and Control,2009,37(5):6-9.
[13]王维俭,侯炳蕴.大型机组继电保护理论基础[M].北京:中国电力出版社,1989:174-191.
[14]张臻,程琤,王慎杰.CT混搭时变压器涌流识别问题分析[J].高压电器,2015,51(7):92-96,101.ZHANG Zhen,CHENG Cheng,WANG Shenjie.Analysis on transformer inrush recognition problem in CT mashup[J].High Voltage Apparatus,2015,51(7):92-96,101.
[15]毕大强,冯存亮,葛宝明.电流互感器局部暂态饱和识别的研究[J].中国电机工程学报,2012,32(31):184-190,235.BI Daqiang,FENG Cunliang,GE Baoming.Research on identification of partial transient saturation in current transformers[J].Proceedings of the CSEE,2012,32(31):184-190,235.
[16]李瑞生,路光辉,王强.用于线路差动保护的电流互感器饱和判据[J].电力自动化设备,2004,24(4):70-73.LI Ruisheng,LU Guanghui,WANG Qiang.Transformer saturation criterion for line differential protection[J].Electric Power Automation Equipment,2004,24(4):70-73.
[17]林湘宁,刘沛,高艳.基于数学形态学的电流互感器饱和识别判据[J].中国电机工程学报,2005,25(5):46-50.LIN Xiangning,LIU Pei,GAO Yan.A novel method to identify the saturation of the current transformer using mathematical morphology[J].Proceedings of the CSEE,2005,25(5):46-50.
[2]余祥坤,吕艳萍,杨丽,等.与ECT混合用于差动保护的电磁型CT的校验方法[J].电网技术,2012,36(10):275-280.YU Xiangkun,L譈Yanping,YANG Li,et al.A verification method for electromagnetic current transformers mixedly applied in differential protection with electronic current transformers[J].Power System Technology,2012,36(10):275-280.
[3]殷伯云,罗志娟,杨丽,等.主变差动保护采用不同原理CT的仿真研究[J].电网技术,2013,37(1):281-286.YIN Boyun,LUO Zhijuan,YANG Li,et al.Simulation analysis of power transformer differential protection adopting current transformers based on different principles[J].Power System Technology,2013,37(1):281-286.
[4]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[5]王维俭.电气主设备继电保护原理与应用[M].北京:中国电力出版杜,1996:53-109.
[6]刘春艳,周多思.保护用电流互感器的特性检测及应用分析[J].电力系统保护与控制,2008,36(15):94-98,102.LIU Chunyan,ZHOU Duosi.Characteristic test and application analysis of protection’s CT[J].Power System Protection and Control,2008,36(15):94-98,102.
[7]朱声石.差动保护采用P级电流互感器的问题[J].继电器,2000,28(7):4-7.ZHU Shengshi.Differential protection using class P current transformer[J].Relay,2000,28(7):4-7.
[8]陶军,白全新,辛东昊,等.继电保护用P级电流互感器性能评估方法[J].内蒙古电力技术,2010,28(4):17-20.TAO Jun,BAI Quanxin,XIN Donghao,et al.Performance appraisal procedure of P class current transformer[J].Inner Mongolia Electric Power,2010,28(4):17-20.
[9]张保会,尹项根.电力系统继电保护[M].北京:中国电力出版社,2010.
[10]李秉宇,郝晓光.保护用电流互感器励磁特性测试及误差校核[J].电力自动化设备,2011,31(1):146-149.LI Bingyu,HAO Xiaoguang.Excitation characteristics test and error checkout for protective CT[J].Electric Power Automation Equipment,2011,31(1):146-149.
[11]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南[M].北京:中国电力出版社,2003.
[12]任先文,徐宏雷,孙楷淇,等.非周期分量对电流互感器饱和特性的影响的仿真[J].电力系统保护与控制,2009,37(5):6-9.REN Xianwen,XU Honglei,SUN Kaiqi,et al.Simulation of influence of current transformer saturation characteristic by aperiodic current[J].Power System Protection and Control,2009,37(5):6-9.
[13]王维俭,侯炳蕴.大型机组继电保护理论基础[M].北京:中国电力出版社,1989:174-191.
[14]张臻,程琤,王慎杰.CT混搭时变压器涌流识别问题分析[J].高压电器,2015,51(7):92-96,101.ZHANG Zhen,CHENG Cheng,WANG Shenjie.Analysis on transformer inrush recognition problem in CT mashup[J].High Voltage Apparatus,2015,51(7):92-96,101.
[15]毕大强,冯存亮,葛宝明.电流互感器局部暂态饱和识别的研究[J].中国电机工程学报,2012,32(31):184-190,235.BI Daqiang,FENG Cunliang,GE Baoming.Research on identification of partial transient saturation in current transformers[J].Proceedings of the CSEE,2012,32(31):184-190,235.
[16]李瑞生,路光辉,王强.用于线路差动保护的电流互感器饱和判据[J].电力自动化设备,2004,24(4):70-73.LI Ruisheng,LU Guanghui,WANG Qiang.Transformer saturation criterion for line differential protection[J].Electric Power Automation Equipment,2004,24(4):70-73.
[17]林湘宁,刘沛,高艳.基于数学形态学的电流互感器饱和识别判据[J].中国电机工程学报,2005,25(5):46-50.LIN Xiangning,LIU Pei,GAO Yan.A novel method to identify the saturation of the current transformer using mathematical morphology[J].Proceedings of the CSEE,2005,25(5):46-50.