| 引用本文: | 于梦瑶,于群,史建省,等.电流互感器饱和对低压电动机保护的影响及对策[J].电力系统保护与控制,2014,42(18):78-82.[点击复制] |
| YU Meng-yao,YU Qun,SHI Jian-sheng,et al.Influences and countermeasures for saturation of current transformers on low voltage motors protections[J].Power System Protection and Control,2014,42(18):78-82[点击复制] |
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| 摘要: |
| 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 |
| 关键词: 电力系统 电动机 电动机综合保护装置 电流互感器 饱和特性 |
| DOI： |
| 投稿时间：2013-12-21修订日期：2014-02-24 |
| 基金项目: |
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| Influences and countermeasures for saturation of current transformers on low voltage motors protections |
| YU Meng-yao,YU Qun,SHI Jian-sheng,ZHANG Zhi-yu,WANG Wen-tao |
| (College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China) |
| Abstract: |
| 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. |
| Key words: electric power system motor motor integrated protection device current transformer saturation characteristic |
