Research and Improvement of Leakage Protection System in Coal Winning Machine

Abstract:

Most of the Shearer adopt additional DC power protection, it has to protect a comprehensive, capacitive current compensation, the simple characteristics of action value of the tuning, however, it in the actual production will occur leakage protection device malfunction, tripping phenomenon For the leakage protection circuit in traction motor of coal winning machine is impacted by frequency converter devices in the course of their work, malfunctions appear frequently. This paper makes an in-depth analysis, analyzing the shortcomings of the current protection circuit, After the analysis of the interference signal, it is proposes a solution of using the subtraction circuit to offset interference signals and conducts a simulation analysis. The above scheme, which is simple and easily realized, can improve the reliability of leakage protection device in traction motor. Avoiding unnecessary production halts. The production efficiency can be improved.

• Periodical: Advanced Materials Research (Volumes 591-593)
• Pages: 419-422
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.591-593.419
• Online since: November 2012
• Authors: Xia Chen, Xin Bo Xi, Peng Chu, Yong Chun Pei, De Lan Wang
• Keywords: Coal Winning Machine, Frequency Converter, Leakage Protection, Traction Motor

References

[1] Coal Mine Safety Regulations Reader Editorial Board. Coal Mine Safety Regulations Reading [M]( Beijing: Coal Industry Press, 2004: 459 -462. ).

[2] Y.L. Wu: the Principles and Applications of the Motors and their Integrated Protection Device[M] (Beijing: Coal Industry Press, 2004: 19 -22. ).

[3] Chan Kwok: the PWM Frequency Control and Soft Switching Power Conversion Technology [M] (Beijing: Mechanical Industry Press, 2001: 132 -144. ).

[4] B.X. Han, Zh.W. Xiang and S.X. Xu, Colliery Mechanical & Electrical Technology , (1999).

[5] Y. Zhang, M.R. Zhou, Coal Mine Machinery, 2006, 27 (12) : 183-185.