| 摘要 |
PURPOSE: A multifunctional motor protection relay is proved to reduce costs of a switch by comprising a driving part of a permanent shaped magnetic switch. CONSTITUTION: A magnetic switch driving part supplies or blocks power to a motor. A voltage signal input unit(130) detects the voltage of a input signal. A current signal input unit(120) detects the current of an output signal of a current transformer for metering. A phase difference input unit(140) measures the difference between a voltage phase and a current phase. A ground fault current input unit detects an output ground fault current signal of the current transformer for metering. [Reference numerals] (101) Operation unit; (111) Driving signal output circuit; (113) Delay release circuit; (115) Charging control circuit; (120) Current signal input unit; (130) Voltage signal input unit; (140) Phase difference input unit; (150) Ground current signal input unit; (160) Motor temperature signal input unit; (171) Pressing switch; (173) State display unit; (180) Communication input and output unit |
