Author: Noyafa–POE checker
What are the reasons for the failure of the directly buried cable? The cable fault tester manufacturer understands the cause of the failure of the directly buried cable, which can effectively prevent the failure, reduce the probability of failure, and help to eliminate the failure in time. Generally speaking. What are the reasons for the failure of directly buried cables? What are the reasons for the failure of directly buried cables? Understand the reasons for the failure of directly buried cables, which can effectively prevent failures, reduce the probability of failures, and help and troubleshoot in time.
Generally speaking. The failure of directly buried wires is caused by the following reasons: 1. External force damage: it is the main reason for the failure. For example, repeating construction, laying water pipes, building canals, planting trees, building buildings, etc. above the directly buried line is often very easy to damage the insulation layer of the buried line, resulting in disconnection faults or grounding faults.
2. Joint failure: Due to the irregular joint process during construction, it is very easy to cause mechanical damage at the joint. Or there are problems such as large contact resistance and poor insulation at the joint. After the wire runs under load for a period of time, hidden dangers at the joint often cause disconnection or ground fault.
3. Irregular laying: When laying directly buried lines, there must be strict process requirements. However, due to the large-scale and wide-area transformation of rural power grids and the shortage of personnel, some areas often have irregular construction behaviors of one kind or another in the construction of direct buried lines. For example, when backfilling trenches, spun soil is not used, and soil blocks containing gravel are used for direct backfilling, which can easily lead to damage to the insulating layer.
Or the trenching depth is too shallow, such as the depth is less than 0.6m, it is easy to cause disconnection or ground fault under the heavy pressure of the ground surface. In alpine regions, if the laying depth is less than the thickness of the frozen soil layer, it is more likely to cause disconnection failure due to thermal expansion and contraction. 4. Other reasons: for example, the direct buried wire itself has quality defects; chemical erosion; termite or rodent bite damage, etc., can also cause direct buried wire failures.
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