Application of Electronic Instrument Transformer in Differential Protection of Electromotor

doi:10.11930/j.issn.1004-9649.2014.2.90.3

Abstract

Abstract: The paper analyzes the causes of differential protection malfunction of electromotors through actual cases, elaborates the improved method of the traditional electromagnetic current transformer circuit, and introduces its defects. It is proposed in this paper to apply the electronic current transformer to the electromotor’s differential protection to prevent malfunction of protection caused by core saturation. Experiments show that the proposed scheme can effectively solve the malfunction of protection caused by core saturation, and improve the reliability and safety of electromotor’s protection.

Key words: electromotor, differential protection, magnetic saturation, electronic current transformer

CLC Number:

TM343

QIAN Li-hong, WANG Wei, WANG Ying-nan, REN Zhe, JIN Peng. Application of Electronic Instrument Transformer in Differential Protection of Electromotor[J]. Electric Power, 2014, 47(2): 90-93.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.2.90.3

https://www.electricpower.com.cn/EN/Y2014/V47/I2/90

References

[1] 葛怀东,姚斌,秦红霞. 电动机差动保护误动事故的分析[J]. 电力设备,2007,8（11）：1-2.
GE Huai-dong, YAO Bin, QIN Hong-xia. Analysis of malfunction fault of motor differential protection[J]. Power Equipment, 2007, 8(11): 1-2.
[2] 贺家李,李永丽,董新洲,等. 电力系统继电保护原理[M]. 北京：中国电力出版社,2010：340-349.
[3] 张小伟,马建胜,罗海冰. 大容量电动机差动保护误动分析及预防措施[J]. 河南电力,2010（2）：1-3.
ZHANG Xiao-wei, MA Jian-sheng, LUO Hai-bing. Analysis on differential protection malfunction of high-power electromotor and its prevention measures [J]. Henan Electric Power, 2010(2): 1-3.
[4] 杨国辉.浅析大型电动机差动保护误动作根本原因及对策[J]. 电机技术,2011（1）：1-3.
YANG Guo-hui. Brief analysis of basic reason and solutions of mistaken actuation of large-size motor differential protection [J]. Electrical Machinery Technology, 2011(1): 1-3.
[5] 张忠禄,施慧. 比率制动式发电机纵差保护的整定计算[J]. 中国电力,2000,33（3）：1-4.
ZHANG Zhong-lu, SHI Hui. Calculation for settings of percentage braking type generator longitudinal differential protection[J]. Electric Power, 2000, 33(3): 1-4.
[6] 王红星,张国庆,郭志忠,等. 电子式互感器及其在数字化变电站中应用[J]. 电力自动化设备,2009,29（9）：2-5.
WANG Hong-xing, ZHANG Guo-qing, GUO Zhi-zhong, et al . Electronic transformer and its application in digital substations [J]. Electric Power Automation Equipment, 2009, 29(9): 2-5.
[7] 黄灿,郑建勇,苏麟,等. 数字化变电站建设中电子式互感器的选型分析[J]. 电气应用,2010,29（5）：2-3.
HUANG Can, ZHENG Jian-yong, SU Lin, et al . Digital substation construction electronic transformer selection analysis[J]. Power System, 2010, 29(5): 2-3.
[8] 孔晓峰,杜浩良. 基于IEC61850标准的数字化继电保护运行方式[J]. 中国电力,2010,43（4）：3-5.
KONG Xiao-feng, DU Hao-liang. Operating mode of digital relay protection based on IEC 61850 [J]. Electric Power, 2010, 43(4):3-5.
[9] 曹树江,林榕,魏颖莉. 单故障和复故障下变压器差动保护计算分析[J]. 中国电力,2012,45（5）：2-6.
CAO Shu-jiang, LIN Rong, WEI Ying-li. A new analysis method for transformer differential current protection under single and multiple faults [J]. Electric Power, 2012, 45(5): 2-6.
[10] 彭世宽,陈凌,王九刚,等. 二次典型设计中继电保护应用说明[J]. 中国电力,2009,42（6） 2-5.
PENG Shi-kuan, CHEN Ling, WANG Jiu-gang, et al . Application explanation of relay protection in typical design of secondary circuits [J]. Electric Power, 2009, 42(6): 2-5.
[11] 李岩军,李晓梅,赵寒. 直阻试验后变压器差动保护误动分析[J]. 中国电力,2013,46（2）：2-5.
LI Yan-jun, LI Xiao-mei, ZHAO Han. Analysis of a mal- operation of differential protection after the DC resistance testing[J]. Electric Power, 2013, 46(2): 2-5.
[12] 田朝勃,索南加乐,罗苏南,等. 应用于GIS保护及监测的罗氏线圈电子式电流互感器[J]. 中国电力,2003,36（10）：53-56.
TIAN Zhao-bo, SUONAN Jia-le, LUO Su-nan, et al . Rogowski coil electronic current transducer applied to protection and monitoring of GIS [J]. Electric Power, 2003, 36(10): 53-56.