evcome cable: four steps to teach you to maintain power cables

2023/06/16
Author: EVCOME-EV Chargers Manufacturers

The operation of power cables is one of the important links in our daily life, work and production. The safety of cable line operation is related to the safe production of enterprises and the safety of people's lives and property. Therefore, cable maintenance is a crucial job. Next, evcome Cable will analyze the related problems in the operation and maintenance of power cables. 1. Test and acceptance of power cables. In addition to handover tests and preventive tests, power cables should also undergo insulation tests during construction to identify and check the cable quality and process quality in each link of construction. Before laying, a test should be carried out on the cable plate to determine the quality of the cable; after laying, a test should be carried out before laying to determine whether the cable is damaged during the laying process; after the construction of the cable head, a test should be carried out to determine the quality of the cable head ; Tests should be carried out before and after cable maintenance to determine the quality of the maintenance. The main contents of the inspection are as follows: 1. The cables should be arranged neatly, the fixing and bending radius of the cables should comply with the design drawings and relevant regulations, the cables should have no mechanical damage, and the marks should be complete, correct and clear. There should be no oil leakage at the intermediate joints of oil-impregnated paper insulated cables and oil-filled cables; 2. There should be no debris in the cable trench and tunnel, the cover of the cable trench should be complete, and the lighting, ventilation, drainage and other facilities in the tunnel should conform to the design Requirements; 3. The marking piles of direct-buried cables should be consistent with the actual path, and the spacing should meet the requirements. The signs should be clear, firm and durable; 4. On both sides of the underwater cable lines, the signs and night lighting devices in the areas where anchoring is prohibited should meet the design requirements. 2. Precautions for cable line operation. 1. Do not overload or overheat for a long time. Therefore, do not ignore the cable load current and external temperature, and monitor the joint temperature; 2. The feeder protection of the cable line must not be put into reclosure. Faults in cable lines are mostly permanent. If the reclosing action will inevitably expand the accident and threaten the stable operation of the power grid; 3. After the cable line feeder trips, do not ignore the cable inspection. Focus on checking whether the cable path is excavated and whether the wire is damaged. If necessary, it should be further checked and judged by testing; 4. Special attention should be paid to the operation inspection of direct buried cables: the ground near the cable path must not be excavated at will; the ground near the cable path must not place heavy objects, corrosive substances and temporary buildings ; The cable path marker piles and protective facilities shall not be moved and removed at will; 5. When the cable line resumes operation after being out of service, it must be re-tested before it can be put into use. 3. Side search for cable faults. After a cable fault occurs, the general measurement steps are as follows: 1. Determine the nature of the fault: According to the phenomenon when the fault occurs and some simple tests, initially judge the nature of the fault and determine whether the fault resistance is high resistance or low resistance, whether it is flashover or closed Faults, whether short to ground, open wire or mixed, whether single-phase, two-phase or three-phase faults. 2. Burn-through of the fault point: that is, to convert a high-resistance fault or a flashover fault into a low-resistance fault through burn-through for rough measurement; 3. Rough measurement: use an instrument to measure the fault distance on one side of the cable, and use the cable line The position of the fault point is calculated by the technical data; 4. The precise point of the fault point: the precise location of the fault point is determined by the impact discharge acoustic measurement method, the audio frequency induction method, and the acousto-magnetic synchronous detection method. Fourth, the operation of the cable line. The operation and maintenance of cable lines are of great significance to three aspects: load monitoring, cable metal casing corrosion monitoring and insulation monitoring. The main projects include: cable line inspection, cable preventive test, prevention of cable damage by external force, analysis of cable fault cause, cable fault detection and wire fault repair, etc. If the cable is damaged, it is necessary to completely eliminate the cause of the fault, and then repair or replace the cable. When replacing the cable, you can choose according to the cause of the failure or the characteristics of the environment. For example, Asia Cable YJV cross-linked polyethylene cables can be used in places with strong corrosion, high humidity and high temperature. XLPE insulated power cables have the characteristics of high mechanical strength, good environmental stress resistance, good electrical performance, and chemical corrosion resistance. In addition, it can also enhance its mechanical strength through armor to adapt to environments such as tunnels, cable trenches or directly buried underground. Although the maintenance work is cumbersome, it is a guarantee for the normal operation of the cable. After all, maintenance is always more effective than repairing after an accident. Cable faults may not only affect our daily life or work and production, but may also cause major safety accidents and loss of life, which is irreparable. Therefore, the maintenance of power cables cannot be ignored. .

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