An insulation monitoring method for completing the connection of charging piles online

Abstract

The invention relates to an insulation monitoring method for completing the connection of charging piles online. The live wire of the three-phase line of the charging pile is connected to the first coil n1, and the second coil n2 is connected between the live wire and the ground wire. In the circuit of the first coil n1 Connect an ammeter A1 to measure the current of the first coil n1. If the ammeter A1 reads, it means that the live wire and the ground wire form a closed loop, indicating that the charging pile is leaking. If the ammeter A1 reads 0, the charging pile is in an insulated state; and enter In the next step, an ammeter A2 is connected to the second coil n2 circuit, and a detection voltage is input to the first coil n1, so that the second coil n2 generates a high voltage mutual inductance. If the ammeter A2 shows a reading, it means that the charging pile has a high voltage leakage, and the ammeter If the A2 reading is 0, the charging pile is high-voltage insulated. This scheme has a simple circuit structure, which can realize insulation detection under normal conditions, and at the same time, insulation detection under high-voltage conditions, thereby improving the reliability of detection.

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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