... The device has 4 structures of a, b, c, d ,to enable different application modes such as power receiving, ... practicability of the system. Besides,the high-resolution A/D converter and the detection method of single measuring range ... circuit, electricityleakage, insulation monitoring, overvoltage, undervoltage, three-phase imbalanceetc.;6. It has the RS485 communication function, which can network 2 ...