Maintenance of lightning protection devices for electric vehicle chargers

The maintenance of lightning protection devices for electric vehicle chargers is an important link to ensure charging safety and extend the service life of the equipment. The following are detailed suggestions regarding the maintenance of lightning protection devices for electric vehicle chargers:

First, maintenance cycle and personnel requirements

Maintenance cycle: The maintenance cycle of lightning protection devices is usually at least once a year. A comprehensive inspection and maintenance should be carried out before the arrival of the thunderstorm season. For high-risk places such as flammable and explosive ones, testing should be conducted once every six months. In case of lightning strike, equipment damage or environmental changes, immediate additional inspection is required.

Personnel requirements: Lightning protection devices should be maintained and managed by full-time or part-time personnel who are familiar with lightning protection technology.

Second, maintenance content and steps

Inspection of external lightning protection devices

Electrical continuity inspection: Check the electrical continuity of the external lightning protection device. If any desoldering, loosening or rust is found, corresponding measures should be taken. Especially at the disconnection card or grounding test point, electrical continuity measurement should be carried out frequently.

Inspection of lightning arresters and down conductors: Inspect the corrosion and mechanical damage of lightning arresters, towers and down conductors, including damage caused by lightning discharge. If there is any damage, it should be repaired in time. When the corroded area exceeds one-third of the cross-section, it should be replaced.

Grounding system detection

Grounding resistance test: Test the grounding resistance value of the grounding device. If the test value is greater than the specified value, check the grounding device and soil conditions, identify the cause of the change, and take effective rectification measures.

Inspection of internal lightning protection devices

Equipotential bonding inspection: Inspect the electrical continuity of the equipotential bonding between the internal lightning protection devices and the metal casings and frames of the equipment. If any loosening or open circuit is found at the connection points, they should be replaced or repaired in a timely manner.

Surge protector inspection

Operation status inspection: Check the operation status of various surge protectors, including whether there is poor contact, whether the leakage current is too large, whether there is overheating, whether the insulation is good, and whether there is excessive dust accumulation, etc. In case of any malfunction, it should be promptly eliminated or replaced.

Third, maintain records and manage

Record and archiving: The design, installation, concealed works drawings and materials, annual inspection and test records, etc. of lightning protection devices should all be archived in a timely manner and properly kept.

Analysis of lightning strike accidents: After a lightning strike accident occurs, the lightning damage losses should be investigated in a timely manner, the causes of the damage analyzed, improvement measures proposed, and reported to the competent department.

Fourth, maintenance precautions

Safety regulations: During the maintenance period, relevant safety regulations for on-site operations should be observed to ensure the safety of personnel and equipment.

Professional tools and instruments: Use professional testing instruments and tools for maintenance to ensure the accuracy and effectiveness of the maintenance.

Professional maintenance: For complex maintenance tasks or malfunctions, professional maintenance personnel should be contacted for operation to avoid self-disassembly or repair, which may cause greater damage or safety hazards.