Author: Noyafa–Cable Length Tester
The popularity of power engineering in China has already been very high. Production and processing in various fields cannot be separated from power engineering, and power engineering cannot be separated from cables. Then the service life of cables can directly affect the safety of production, processing and manufacturing. The popularity of power engineering in China has already been very high. Production and processing in various fields cannot be separated from power engineering, and power engineering cannot be separated from cables. Then the service life of cables can directly affect the safety of production, processing and manufacturing. The cable fault tester manufacturer points out that the service life of the cable is determined by the air oxidation induction period of the grommet material. External force damage According to the operation analysis in recent years, especially in today's rapid economic development, a considerable number of cable faults are now caused by mechanical damage. Wet insulation This is also very common, generally occurring at cable joints in direct burial or in pipes.
For example, if the cable joint is not qualified and the joint is made in a humid climate, the joint will enter water or be mixed with water vapor. After a long time, water branches will form under the action of the electric field, which will gradually damage the insulation strength of the cable and cause failure. Chemically corroded cables are buried directly in areas with acid and alkali effects, which often cause the armor, lead or outer sheath of the cable to be corroded. Can cause cable failure. Chemical: The cable corrosion of the unit is quite serious.
Long-term overload operation During overload operation, due to the thermal effect of the current, the conductor will heat up when the load current passes through the cable. At the same time, the skin effect of the electric charge, the eddy current loss of the steel armor, and the loss of the insulating medium will also generate additional heat, so that the temperature of the cable will be increased. rise. During long-term overload operation, excessive temperature will accelerate the aging of the insulation, and even the insulation will be broken down. Especially in hot summer, the temperature rise of the cable often causes the weak insulation of the cable to be broken down first, so in the summer, there are many cable failures.
Cable joint failure The cable joint is the weakest link in the cable line, and the cable joint failure caused by the direct fault of the personnel (poor construction) often occurs. In the process of making cable joints, if there are original nets such as joints that are not crimped tightly, insufficient heating, etc., the insulation of the cable head will be reduced, resulting in accidents. Environment and temperature The external environment and heat source of the cable will also cause the cable temperature to be too high, insulation breakdown, and even explosion and fire.
Other factors The manufacturer of the cable fault tester believes that other reasons such as normal aging of the cable body or natural disasters are also factors that lead to the reduction of cable insulation.
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