Maintenance countermeasures
In view of the power cable to the above several types of fault, can develop countermeasures according to the reality.
To the middle connector and terminal head of production process, can strengthen the net cable head attachment test, on the basis of the relevant provisions, strictly controlled; Stripping sheath, insulation shield semiconductor layer careful operation, carried out on the insulation surface grinding and clean thoroughly, prevent the impurity particles legacy on the insulation; Installation environment humidity below 70%.
Make a series of specific provision on cable installation: armoured layer and copper shield must be separate grounding, and its cross section is not less than 25 square millimeter; Single core cable must be affected by one-point earthing electricity end, three core cable ends must be grounded, at the same time to the cable nose do tin plating processing.
In order to prevent the cable from external force damage, can do it for mechanical parts wear tube and protection to be fixed, the middle joint external protection, on both sides of the joint plus fixed protection; In the process of construction, ensure no external force to line the nasal twist deformation, if must do twisting process, measures should be taken to make the surface smooth;Near the cable construction team, to increase the smart card, send someone remind construction personnel when necessary.
Cut joint: before cut, first to check whether there is water inside the joint and moisture, if any, cannot use cut torch connector, because the burner heating makes moisture from joint on both sides of the inside to the cable, it is better to hammer and rationalism knife cut casing; If there is no moisture and moisture, usable burner to lead a very hot, in addition to the lead of dirt, scrape rusty spot, wipe the soldering tin slag, away from the flexible power cable joint, for reuse.
Remove moisture, baking method available. It is with a torch or charcoal fire roasted, expelling dampness. This method can only be used for a small amount of moisture. When the paper insulated conductor by moisture, can use casting wax, to remove the moisture with hot wax. Ash from 60% and 40% of medium-sized vaseline blend to heat up to 130-140 degrees which, when casting wax control in 120-130 degrees, water the wax from the two side lead sheath incision 10 to 15cm in lead sheath, gradually to move water cut, and after condensation of wax material again to slit to the joint central casting, until no air bubbles on core and the voice of the impregnation.
