- Excessive grounding resistance
When the emergency protection pipeline grounding resistance increases, it will affect the action of the leakage protector, resulting in pipeline leakage is not protected in time. Grounding resistance is too large may be due to poor geological conditions, pipeline corrosion prevention measures are not appropriate, grounding system contact resistance is too large. Preventive measures include:
1, choose the location of excellent geological conditions for the construction of pipeline systems, such as the selection of limestone with good conductive properties, sandstone and other geological conditions;
2, for the pipeline corrosion prevention measures should be done thoroughly and effectively, to ensure that the grounding system has good conductivity;
3, monitoring pipeline grounding resistance, found that the grounding resistance is unqualified, should take timely measures to improve.
Second, the protective grounding line failure
Failure of the protective grounding line may lead to pipeline leakage protection failure, such failures include open circuit grounding line, short circuit, contact resistance is too large. Preventive measures include:
1, in the construction process to do a good job of insulating the protective grounding wire;
2, regular maintenance and inspection of the protective grounding wire, and timely treatment of problems found;
3, the use of double protective grounding wire to ensure the reliability of pipeline leakage protection.