Air pollution will affect people's daily life. In order to reduce the impact of air pollution on people's lives and health, electric vehicles are gradually popularized, which has promoted the development of electric charging piles, which brings great convenience to people's travel. Lightning protection detection pointed out that with the increase of charging piles, its daily maintenance work cannot be ignored, especially the lightning protection of charging piles is essential.


Charging pile is a metal body built outdoors. When there is lightning activity nearby, Thundercloud will generate electrostatic induction and electromagnetic induction, so that the charging pile in the charged state is induced and there is a high voltage, which causes the occurrence of lightning accidents. Therefore, the lightning protection of the charging pile should be strengthened.


In addition, when the charging pile is located in an open and flat field, it may be directly struck by lightning, and the lightning current or high voltage will threaten the electric shock of the charging pile and nearby people. The general AC charging pile is composed of a pile body, a power input interface, a charging interface, a protection circuit, a control circuit, and a safety protection device. If necessary, a metering device, a card reading device, a human-machine interaction device, and a communication interface can be added to ensure charging. For normal and safe use of piles, relevant lightning protection measures must be taken.


For lightning protection measures of charging piles, first of all, AC charging piles for automobiles, especially those built outdoors, should have good grounding, and the grounding resistance should be within 10 ohms.


Good grounding can not only ensure the safety of personnel against electric shock during charging operation, but also ensure that the channel of lightning current into the ground when a lightning strike occurs is unblocked, preventing personnel from being subjected to lightning strikes. Among them, the use of a protective ground wire in the cable that provides AC power to the charging pile for grounding is effective for personal safety caused by leakage, but it is almost ineffective for lightning protection because the cross-sectional area of the protective ground wire is relatively small, and The length of the cable may be relatively long. The charging stations built on the road and in the site should be connected to the grounding system in the station area.


Secondly, the vehicle charging pile should be installed with a power surge protector for lightning protection. The maximum discharge current of 40kA can be selected, and the power surge protector with fast response time and ultra-low voltage protection level is mainly used for secondary protection of AC power systems. Lightning protection has good protection for car charging piles.


In the future, car charging piles will be widely used. In order to ensure the safety of car charging and ensure the normal use of charging piles, it is urgent to strengthen lightning safety protection.