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| Analysis of the SIEMENS 7SJ62 Low Voltage Protection Malfunction |
| Fang Jiacai1, Wang Shanju2, Fang Jiarui3 |
1. Tianjin Steel Group Co., Ltd, TianJin 300301;
2. SGMW Qingdao Branch, Qingdao, Shandong 266500;
3. Qingdao Oil Refining Chemical Co., Ltd, QingDao, Shandong 266500 |
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Abstract Running in the same 6kV bus 6 high-voltage motor configuration is SIEMENS 7SJ62 Multi-Functional protection, but the secondary voltage of the bus fault, low voltage protection action is different, Three trip, three no. In view of the accident, the technical personnel make a painstaking investigation, careful analysis, determine the instability caused by locking U<logic operation time, then by graphic proportion method measured phase voltage phase angle, simulate the fault voltage protection action confirmed the reason of malfunction.Subsequently proposed resetting calculation or update the protection device to solve the problem.
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Published: 22 March 2016
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| Cite this article: |
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Fang Jiacai,Wang Shanju,Fang Jiarui. Analysis of the SIEMENS 7SJ62 Low Voltage Protection Malfunction[J]. Electrical Engineering, 2016, 17(3): 123-125.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2016/V17/I3/123
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[3] DIGSI CFC手册E50417-H115D-C098-A1[Z]. 西门子有限责任公司, 2005. |
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2016, Vol. 17 
