CAJ | 학술논문

目前电动机综合保护装置被广泛应用于工业生产中，但由于电流互感器参数选型不当，在定子绕组短路电流过大时，电流互感器容易发生饱和而使电动机综合保护装置误动作。利用 PSCAD 软件，对低压电动机定子绕组故障时保护用电流互感器和电动机综合保护装置内微型电流互感器的性能进行仿真分析后，提出了在电动机保护装置的继保算法中加入三采样算法的措施，并借助 Matlab/Simulink 进行仿真验证。该措施克服了在电流互感器饱和的情况下，因傅里叶算法采样时间过长而造成电动机综合保护装置的主保护不能可靠动作的弊端，提高了低压电动机保护装置运行的安全可靠性。
목전전동궤종합보호장치피엄범응용우공업생산중，단유우전류호감기삼수선형불당，재정자요조단로전류과대시，전류호감기용역발생포화이사전동궤종합보호장치오동작。이용 PSCAD 연건，대저압전동궤정자요조고장시보호용전류호감기화전동궤종합보호장치내미형전류호감기적성능진행방진분석후，제출료재전동궤보호장치적계보산법중가입삼채양산법적조시，병차조 Matlab/Simulink 진행방진험증。해조시극복료재전류호감기포화적정황하，인부리협산법채양시간과장이조성전동궤종합보호장치적주보호불능가고동작적폐단，제고료저압전동궤보호장치운행적안전가고성。
At present motor integrated protection device is widely used in industrial production. However, when stator winding short-circuit current is too large, it is easy to lead to the current transformer in saturation state thus cause the malfunction of the motor integrated protection device, because of the improper selection of parameters of current transformer. Therefore, by using the PSCAD/EMTDC software and simulation analyzing the performance of the current transformer for protection and miniature current transformer of motor integrated protection device after the low voltage motor stator winding fault, this paper puts forward to add the three sampling algorithm in motor protection device protection algorithm. Meanwhile, it takes advantage of MATLAB/Simulink’s simulation to verify the proposed measure. Besides, this measure overcomes the disadvantage of motor integrated protection device’s unreliable action as the main protection in the saturation of the current transformer, which is caused by the long sampling time of Fourier’s algorithm. So it could improve the safety and reliability of the low voltage motor protection device’s operation.