I. Routine Inspection Cycle
1. Annual Inspection:
Applicable to substations, workshop electrical equipment, independent lightning rods, etc.
Inspection includes checking for loose grounding wire connections, corrosion, or damage, and ensuring the grounding resistance value meets standards.
2. Pre-Rainy Season Special Inspection:
The grounding down conductor of the lightning protection device needs to be inspected before the rainy season to ensure reliable lightning protection performance.
3. Shortened Cycle for Special Environments:
In corrosive soils or chemically polluted areas, it is recommended to dig up a section of the ground every 5 years to check for corrosion of the grounding electrode.
II. Inspection Content and Standards
1. Visual Inspection:
Focus on checking for breaks or rust on the grounding wire, the firmness of the connection points, and the aging of the sealing ring.
2. Resistance Test:
The grounding resistance value must meet specifications, for example, ≤10Ω for independent lightning rods and ≤5Ω for substations.
3. Environmental Adaptability:
In humid or corrosive environments, inspections should be strengthened, and dehumidification or anti-corrosion measures should be taken if necessary.
III. Maintenance Recommendations
1. Regular Testing: It is recommended to measure the grounding resistance annually in March-April or when the soil is dry.
2. Professional Maintenance: On-site inspection and acceptance can be entrusted to an organization (such as Shenzhen Zhongnuo Testing).
3. Standards and Standards: Refer to standards such as the "Technical Specification for Explosion-proof Safety Testing of Electrical Equipment in Hazardous Locations".
