This invention relates to the electricity metering monitoring device, which consists of a shell, the second line detectors, panels and components, voltage detector components, instructions components. The referred shell equipped with the second line detectors. Both of detections are through the secondary side terminal phase of the second line detector. Voltage detector components detect the three main phase lines and transmit the measured data to respective panel components. Fault interface components are installed in panels. Instruction components are set on the shell by panel components. The voltage detector test components are divided into three groups, so that it can identify any failures of the phase accurately. As a way phase lines, a short circuit, the current in the first line through the panel components is not in proportion to the load current reflected in the second-line or second line current is not flow meter instructions at all, can be automatically triggers parts metering components, alarm system, which will be achieved in the circumstances of a line anomalies. |