SPD Miswiring detection method for power surge protective device with preventing malfunction of residual current detector

摘要

The present invention relates to a method of detecting a faulty wiring of an SPD for power supply considering the malfunction prevention of an earth leakage breaker. The detection unit detects the voltage between the phase and the ground and the voltage between the neutral and the ground and transmits it to the Micro Controller Unit (500). And a determining step of determining whether the connection between the phase and the neutral wire is normal by comparing the transmitted voltage with a preset reference voltage by the microcontroller unit 500, In addition, the preset reference voltage is AC 220V, the voltage between the phase and the ground is measured as AC 220V, and the voltage between the neutral line and the ground appears as small as AC 1~30V. If the detected voltage is within the above range, the connection is normal. It characterized in that it is judged as. In addition, an earth leakage breaker is installed in the switchboard where the power surge protector is installed, but the rated sensitivity current is operated at 5mA or more, In the present invention, the method of determining the installation stability of the power surge protector and the power surge protector with improved installation stability provides information that the phase and the neutral wire are changed by mistake of the installer, and a speaker, LED, LCD, There is a remarkable effect of preventing accidents by notifying them through a display unit such as 7 segments. In addition, there is a remarkable effect that a trip phenomenon does not occur because the earth leakage circuit breaker is not operated by minimizing the current and time flowing during the operation of the faulty construction detection circuit.