Cable accessories to protect casing rupture remedial method and the matters needing attention in the process of use
in this paper, we mentioned the part of the cable accessories application in daily life scenes, today small make up to bring you know cable accessories in life to protect casing rupture remedial method and the matters needing attention in the process of use.
crosslinked heat shrinkable cable accessories of simple structure, compact, lightweight, easy to site construction, currently in the middle of the power cable connector installation has been widely used in the production process. However, in the production process such as temperature control is bad or production process, materials and other reasons, will affect the construction quality. We often encounter a situation, the use of heat shrinkable cable accessories for a 10 kv crosslinking cable intermediate joint construction process, sometimes because of careless construction personnel, to protect the casing outside the heat shrinkable cable, burner mouth touch casing, hot tube mouth, because of outer casing had just finished hot shrinkage, is very hot bad cracks appear quickly on a 200 mm gap and folding state, seriously affecting the effects of the middle joint sealing. Such as to make, the middle joint must be cut off, not only to extend the time of sending, and cause the material waste.
let's say the next what remedies
in the first place, we can be broken part of the outer protective casing annular resection, with a knife, about 200 mm distance resection on both ends of the port with wood file burnish, gently clean of dander, enhancing the effect of slaughter and seal.
second, in the grinding area half a lap has a layer of filling glue. With blowtorch to heat shrinkable belt end heating, make the glue on one side and a cuny sex surface after 50 mm away from filling glue for fixed.
again, brought hot shrinkage with baking heat while bag around the filling glue heat shrinkable belt should be half a lap. Wrapped around to the other end, make the hot shrinkage with full coverage on the filling glue.
later, such as heat shrinkable belt after all fixed, with micro fire to heat shrink with uniform heating, melt filling glue fully in order to enhance the sealing effect, and then half a lap with insulation around the thermal shrinkage, insulating tape package shall not be less than three layers to enhance the sealing effect, at the same time protect heat shrinkable belt buried underground after from damage.
this method is feasible for medium and low voltage cable, not suitable for high voltage cable.
of course, we in the middle of the power cable connector installation in the process of production, we need to pay attention to the following four points:
( 1) Outer protective casing to check before hot shrinkage binding thread steel kai fracture and ground wire welding in don't have flange and burr, at the same time check outside casing end face whether level off, don't have gap, avoid shrinkage cracking caused by stress concentration.
( 2) With blowtorch to heat shrinkable belt end heating, make the glue on one side and a sticky surface are fixed on the 50 mm away from filling glue, then filed a hot shrinkage with baking heat while on filling glue. Heat shrinkable belt should be half a lap around to the other end, make the hot shrinkage with full coverage on the filling glue.
( 3) Not easy, because of the large outer protective casing diameter shrinkage, hot shrinkage flame should be constantly moving in the direction of the contract, to ensure uniform shrinkage. When the outer protective casing contraction close to tube, burner should be far away from the outer casing, appropriate control of temperature, to avoid burning cause craze.
( 4) To happen in the process of hot shrinkage as outer casing crack, should immediately stop heating to reduce the outside casing craze degree, after being cool will craze for circular cutting, flat end face and make the incision without removing cracking parts bump crack, and then continue to heat contraction good heat shrinkable belt.
above is just personal idea, welcome to share the supplement.