| Popis: |
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. |
