Author: Noyafa–CCTV Tester
UHV sheath cable fault tester use report Because the cable is damaged due to mechanical damage and material defects during the laying process, it is easy to cause damage to the cable sheath. And this kind of sheath insulation damage will lead to moisture intrusion, and the main insulation will produce water tree aging. Because the cable is damaged due to mechanical damage and material defects during the laying process, it is easy to cause the cable to be damaged. Skin damage. This kind of damage to the insulation of the sheath will lead to moisture intrusion, increase the probability of water tree aging in the main insulation, and have a serious impact on the life of the cable; it will also generate circulating current to cause loss and heat, resulting in local overheating of the insulation and accelerated insulation aging, severely limiting power transmission. , affecting the life of the main insulation; it may also cause the main insulation to generate electric field concentration where the metal sheath is corroded, which is prone to partial discharge and electrical tree generation, posing a threat to the short-term operation of the cable.
By using the ultra-high voltage cable sheath fault tester, using the resistance ratio method for distance measurement, and the step voltage method for precise point determination, such faults can be efficiently detected and played a good preventive role. The situation of cable failure is also complicated due to the environment in which the cable is laid and other reasons. Most of the cable faults can be located by the popular traveling wave method, but for the fault of the cable with large area of water, the traveling wave method is not easy to obtain the ranging waveform, so it is impossible to judge the fault distance, resulting in the precise location of the fault. blindness.
By using the EHV cable sheath fault tester, when the total length of the cable is known, the percentage of the fault distance to the total cable length is measured, so that the fault distance can be generally known, and the staff can accurately determine the point. In the process of using this instrument, some difficult cable faults have been found, especially the sheath fault of ultra-high voltage cables. Especially EHV cable fault) plays a very good preventive role.
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