By hvhipot 
The cable fault tester under HV Hipot Electric Co., Ltd. power can help many power workers conduct various power tests more conveniently.
Usually, there is no corresponding processing equipment. In practical operation, if the cable end is filled with water, the front end can only be cut off a few meters and can be used continuously. If the entire cable is read, it is basically impossible to obtain and it is directly scrapped. Therefore, preventing cables from entering water is the correct choice. Take preventive measures, take effective preventive measures.
Firstly, the cable head should be kept sealed, whether stacked or laid. The sawn cable end should be sealed with plastic and a cable specific sealing sleeve should be used to prevent moisture from seeping in. After laying the wires, cable heads should be made in a timely manner.
Secondly, when purchasing cables, it is necessary to choose high-quality manufacturers. Due to impurities and pores in insulation materials being the starting point of water trees, the quality of cables is crucial for preventing water tree aging.
Thirdly, in order to strengthen the management of the cable head manufacturing process, once the cable enters the water, the earliest breakdown phenomenon is usually the cable head. Therefore, if the wire head is made well, it can extend the overall life of the cable. If the cable is peeled off from the semiconductor layer, some traces are formed on the semiconductor layer, and then the semiconductor is peeled off like sugarcane. However, when using cutting tools, if pulled too far, it can damage the insulation layer and provide opportunities for the generation of water trees. In addition, during welding, due to the inability to find a power series resonance, the welding gun will be directly used to melt the solder. At this point, the flame will damage the copper shielding layer and insulation layer, so this phenomenon should be eliminated. The correct way to configure UPS is because the welding time is usually only 10 minutes, but the power is only 500W.
The use of cold shrink cable heads and silicone rubber cable accessories tightly adhere to the cable, overcoming the disadvantages of heat shrink materials (which lack elasticity and allow for thermal expansion and contraction of the cable body). There is a gap between them, which is beneficial for the development of water trees. The long cable adopts a cable branch box and multiple long cables, each cable is about 3km long. For this type of cable, in addition to the intermediate joint, one or two cable branch boxes are also used. Once one of the cables enters the water, it is also easy to find the cables scattered to other parts in case of cable failure.
The 10kV system uses 8.7/10kV grade cables. The insulation thickness of this level of cable is 4.5mm, while the insulation thickness of 6/10kV level cable is 3.4mm. Due to the increase in the thickness of the cable insulation layer, the field strength decreases and it can prevent the aging of water trees. At the same time, due to the 10kV neutral point low current grounding system being single-phase grounded, the cable is subjected to 1.73 times the phase voltage as needed. To run for 2 hHV Hipot Electric Co., Ltd.s, the cable insulation layer must be thickened. PVC plastic double wall corrugated pipe has corrosion resistance, smooth inner wall, good strength and toughness. The outer sheath of the cable can be greatly damaged when buried directly. Design of cable trenches (pipes) and cable wells. Due to limitations in conditions, cable laying adopts the form of direct burial or cable trench, mainly direct burial. For example, it belongs to the coastal rainy area and has accumulated water in cable trenches or cable wells for many years. Due to the depth of cable trenches or cable wells exceeding that of sewers, it is difficult to drain water. Therefore, coordination should be made during the planning period to facilitate the drainage of cable trenches (wells). If the cable well cannot accumulate water, the intermediate joint in the cable well should be supported by a bracket.
In addition, there are many chemical companies in the chemical industry. During the inspection, it was found that some wires in the cable trench near the chemical factory were severely deformed. Therefore, the cable trench near the chemical plant must have complete drainage facilities. In addition, when designing cable conduits, bends should be minimized as straight as possible and cables should be easy to lay. At the same time, when making cable wells, they are divided into large cable wells and small cable wells. A large cable well can be used to pull cables, coils, and serve as an intermediate joint. It is not convenient to use a wire well in the middle of the road, but it must have a corner and be replaced with a small cable. It is only used to place a turning pulley when laying cables.