The installation of the cable intermediate joint explosion-proof box process what inspection does need make?
with the popularity of electricity, cable accident rate has proved a lot. About eighty percent of accidents and cable attachment, especially among cable connector. Cable intermediate joint as important connection point of the whole power supply network, the operation stability will directly affect the running quality of power supply system, so the installation of the cable intermediate joint explosion-proof box process what inspection does need make?
check with glass fiber reinforced plastic shell by the applicable specifications and dimensions and the outer diameter of the cable and intermediate head ( The stress cone or copper shell) It fits the dimension;
check glass fiber reinforced plastic shell sealing materials ( Two port opening gasket, glass fiber reinforced plastic shell and the seal of the cable material: strip and heat shrink tubing) Whether is complete;
check the high voltage cable sealant two component cable plastic packaging is complete, the number of components, adequacy of glass fiber reinforced plastic shell assembly, towards the middle of the installation of glass fiber reinforced plastic shell joint section of clean processing, fitted with glass fiber reinforced plastic shell of the upper and lower half, which leads to the cable, coaxial cable or ground several bolt tightening up, explosion-proof box of two ports and coaxial cable or grounding cable seal processing ( Package sealing strip and shrink the heat shrinkable tube) , high voltage cable seal will be two components ( A B glue) Together, stir well;
glue: glue should pay attention to its continuity, two groups of glue into the interval of time as short as possible; Please note that leak adhesive when glue;
note: high voltage cable sealant glue in the process of curing two-component cable slightly volume expansion, so can't fill too full, on the general irrigation below glue along the height of 20 to 30 mm;
according to related statistics, over the past 20 years, China's cable fire more than 1140, 2005 - Up to 562 times in 2010, plant 2 times, direct and indirect economic loss of more than 50, one hundred million yuan. According to the power failure analysis, the cause of cable fire is among cable head production quality bad, pressure connector cable tight, contact resistance is too large, long journey made cable head overheat in insulation, resulting in cable trench or direct buried cable fire happened. Now in cable trench borehole ordinary cable is more, some ditch Wells may also filled with biogas combustible gases, such as cable joint once explosion, even a spark, can ignite the ditch Wells, cause huge economic losses, even uncovered in cable trench covers damage threatening the pedestrians. Therefore, indirectly in the cable head equipped with protective box has been extremely necessary.