System is protected in a kind of electric hydraulic excavating machine high-power high voltage motor safe operation

System, including high-tension motor are protected the invention discloses a kind of electric hydraulic excavating machine high-power high voltage motor safe operation（1）, high pressure vacuum auxiliary contactor（6）, reactor（7）, high voltage power supply detection unit（9）, high-voltage insurance（11）, control transformer（12）, low tension switch（13）, overvoltage protector（20）, master controller（18）, and the high pressure vacuum main contactor being connected with master controller（5）, Microcomputer Protection device（8）, automatic vacuum breaker（10）, insulation detection device（15）, motor heater control device（16）And stop button（17）；Motor heater, temperature sensor and lubrication detection switch are additionally provided with inside the high-tension motor.The present invention makes high-power high voltage motor clean boot, safe operation on board a dredger, meets excavator its usage economy, the feature of environmental protection, and the safety and reliability operated.