What are the common failures of steel wire armored power cables?

I. What are the common failures of steel wire armored power cable? Steel wire armored power cables are made of different materials conductor mounted in a metal casing with insulating material, is processed into a solid combination of bendable. Armored cable including armored thermocouple, armored RTD, armored heater and armored lead, mainly used in chemical industry, metallurgy, machinery manufacturing, power generation and scientific testing, etc. Temperature measurement, signal transmission and special heating, with a large amount of armored thermocouple. With metal materials armored protective layer of the cable, the cable plus the purpose of the armor layer in addition to enhance tensile strength, compressive strength and other mechanical protection to extend the service life, but also through the shielding protection to improve the cable anti-interference properties. Commonly used armoring materials are steel tape, steel wire, aluminum tape, aluminum tube, etc., of which steel tape, steel wire armor layer with high permeability, has a very good magnetic shielding effect, can be used for low-frequency interference, and can make the armored cable laying and free from wearing pipe and inexpensive in the actual use of more. Steel wire armored power cable failure rate is high, rubber cable failure rate is low, for armored cable, resulting in cable short-circuit fault reasons are: (1) in the cable wiring, cable wiring process does not meet the quality requirements, to comply with the requirements of the cable wiring process, especially pay attention to deal with the insulation in the end of the head, do not allow moisture to enter the key connections to avoid affecting its insulation. (2) cable armored steel belt cracks, laps are not good, lead package cracks into the moisture, especially in the cable in the end of the wiring weak links, so that the insulation damage caused by a short circuit, pay attention to the cable bending radius can not be too small, should not be less than 20 times the outer diameter of the cable.

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