Insulation monitoring method for completing charging pile connection online

Abstract

The invention relates to an insulation monitoring method for completing charging pile connection online. The insulation monitoring method comprises the following steps of: connecting a first coil n1 to a live wire of a three-phase wire of a charging pile, connecting a second coil n2 between the live wire and a ground wire, and connecting an ammeter A1 to a circuit of the first coil n1 for measuring the current of the first coil n1, if the reading of the ammeter A1 shows that the live wire and the ground wire form a closed loop, indicating that the charging pile leaks electricity, and if the reading of the ammeter A1 is 0, the charging pile is in an insulating state; and entering the next step, namely, connecting an ampere meter A2 into a circuit of the second coil n2, and inputting a detection voltage to the first coil n1, so that the second coil n2 generates a mutual inductance high voltage, if the reading of the ampere meter A2 shows that the charging pile has high-voltage electric leakage, and if the reading of the ampere meter A2 is 0, the charging pile has high-voltage insulation. The insulation monitoring method is simple in circuit structure, can realize insulation detectionin a conventional state, and can further realize insulation detection in a high-voltage state, so that detection reliability is enhanced.

Description

technical field [0001] The invention relates to insulation monitoring, in particular to an insulation monitoring method for completing charging pile connection online. Background technique [0002] With the massive construction and application of electric vehicle charging stations and charging piles, their safety has been paid more and more attention. In particular, DC charging piles have high power, large volume, and high voltage, and are often equipped with batteries for energy storage, so the structure is complex. When the insulation of the charging pile output DC side is not good, it will cause equipment damage, fire, and personal electric shock. Since the leakage fault on the DC output side cannot activate the leakage protector on the AC side, it is particularly important to add insulation monitoring and ground fault protection devices on the DC side. The current charging pile insulation monitoring method is mainly based on the bridge method, which includes the balanc...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the existing technology is that the wiring of the balanced bridge method is relatively complicated. In addition, the balanced bridge method can only detect leakage under normal conditions, that is, working at the rated voltage or within the voltage fluctuation range allowed by the system, and cannot Detect leakage under high voltage state

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