How To Carry Out Maintenance Checks Of The Grounding Device?
The grounding device is good or bad, directly related to the personal and equipment, even involving the normal and stable operation of the system. Do not think that has installed the grounding device, it will be peaceful and trouble-free. In practice, should be all kinds of grounding device for regular maintenance and inspection, usually should also be based on the actual situation needs, temporary inspection and maintenance. Grounding device is an important part of the overvoltage protection device, correct inspection and maintenance, often keep it in good condition, is an important part of the guarantee operation. Because the grounding device is buried in the ground, in addition to checking its appearance and the connection of the grounding lead, mainly by measuring the results of the grounding resistance to make a judgment. According to the inspection situation, if found to have unqualified place, should be timely remedial treatment.
Grounding device maintenance inspection
Such as grounding leads the intermittent card contact poor should be removed from the rust tightening; when the conductor corrosion of more than 30% should be changed conductor, etc.. It should be noted that the electrical equipment or building lightning protection grounding device for repair or remedial treatment, also according to the original design drawings required construction. Grounding device maintenance inspection cycle is generally: the grounding network of substation (distribution) or plant workshop equipment grounding device, should measure the grounding resistance value once a year to see if it meets the requirements, and compare the last measured value to analyze the changes. For other grounding devices, it is required to test every two years, according to the size of the grounding device, the importance of the electrical system and seasonal changes and other factors, the grounding device should be 1-2 times a year for comprehensive maintenance checks.
The specific contents of the inspection are:
1. Whether the grounding cable is broken, damaged or seriously corroded.
2. Grounding branch cable and grounding trunk cable connection is solid.
3. Grounding point soil is not affected by external forces and loosening.
4. Check whether the grounding cable, grounding body and its connections are intact.
5. Check whether the bolts of all connection points are loose, and should be tightened one by one.
6. Excavate the ground around the grounding lead, check the underground 0.5m about the degree of corrosion of the ground wire, if the corrosion is serious, should be immediately replaced.
7. Check the ggrounding cable connection line card and jumper wire contact is intact.
8. For mobile electrical equipment, each time before use must check whether the ggrounding cable contact is good, there is no broken strand phenomenon.
9. Artificial grounding body around the ground, should not be stacked with strong corrosive substances.
10. Grounding device in the inspection, if found in one of the following cases, should be repaired.
(1)Shaking test grounding device, found that its grounding resistance value exceeds the original specified value
(2)Connection line connection welding cracked or interrupted connection
(3)Grounding cable and electrical equipment crimping screws loose, crimping and poor connection
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