The Solution for Malfunction of the Leakage Protection System Caused by Mine-Used Converter

Abstract:

The leakage protection system usually trends to make a misjudgment and tripping in normal operation after applying the converter in the coal mine power system. This seriously affects the safety in coal production. Based on the research of the structure and working principle of the converter, it has obtained the definite reason for the converter interfere the leakage protection system. It is the higher harmonics and pulses that generate the zero sequence current through the ground capacitance. Combined with the actual situation in coal mine, it has proposed two corresponding solutions: one is adding the isolation transformer in the output lines of the converter; another is modifying criterion of the leakage protection system. Both methods have their own characteristics, and have verified the feasibility of the methods through the MATLAB simulation.

• Periodical: Advanced Materials Research (Volumes 912-914)
• Pages: 1481-1484
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.912-914.1481
• Online since: April 2014
• Authors: Yan Wen Wang, Hai Hong Li*, Da Wei Wang, Zheng Fan
• Keywords: Frequency Converter, Leakage Protection System, Malfunction, MATLAB

References

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