Research on Intelligent On-line Insulation Monitoring Device of Ship´s AC Power Grid

The insulation monitoring of ship power system is an important measure to remove faults and hidden troubles. Its condition concerns the security of power system and operation safety of ships. Conventional ship power system insulation monitoring is hard to accurately monitor the insulation resistance decreasing or precisely locate the grounding branch. It takes much time and energy to rule out the insulation failure. This paper introduces the intelligent on-line insulation monitoring device. Based on zero-sequence current detecting method, dual-frequency injection method and SCM control, it can accurately and efficiently monitor the ship power grid and guarantee the operation safety of ships.