Ground polarity determination device through DC ground line tracking method using pulse wave and phase analysis of ground current

摘要

The present invention is a device for monitoring the grounding state of a DC power system, which is a control and monitoring power source for power and communication facilities. It generates a pulsed high frequency at all times and applies it to the DC power supply and ground it to one of the “+” or “-” poles during standby. When , it becomes a closed circuit and allows pulsed high frequency waves to flow. At this time, by detecting the pulsed high frequency current and recognizing the grounding line, measure the grounding voltage that varies depending on the grounding resistance to know the grounding degree and grounding polarity. In addition, it is a method to clarify the grounding polarity determination by analyzing the phase of the collecting wave and logically comparing it once more. In addition, when pulsed high frequency waves of several preset frequencies are detected, it is compared with the ground of other DC power grids. It also includes the ability to detect contact points.