Abstract：On February 9, eight o'clock, for SM2 4# motor unit in the process of start, 6# motor unit differential protection act, 6# motor unit trip. After the test and analysis, proves that due to the connection mode is not reasonable, the three-phase sampling current neutral on both sides of protection not consistent, the outside fault lead to differential current protection beyond definite value, differential protection act,and motor unit trip.
段强. 南二泵站机组差动保护动作分析及改进措施[J]. 电气技术, 2013, 14(08): 54-58.
Duan Qiang. Differential Protection of Motor Unit in SM2 Action Analysis and Improvement Measures. Electrical Engineering, 2013, 14(08): 54-58.
2013, Vol. 14 
