gui chao cable news: note the power cable laying and laying-非凡电子娱乐

some customers in the design of low and medium voltage power cable,

there are misunderstandings in the actual carrying capacity and the theoretical carrying capacity of power cables,

it is believed that the power cable can be used as long as the actual operation capacity of the equipment can be met,

however, the actual running load flow of the cable is ignored,

buried the hidden danger for the cable accident.

a new silicon industry company, more than 50 10kv power cable factory internal transmission,

all alone through the thick white pvc plastic pipe, without gap free stacking of 5 stacked,

then the soil buried, buried depth of about 1 meters, the number of power cable laying of each layer is 10,

the distribution of the whole cable pipe in the underground section of the basic rectangular arrangement, the total length of the cable line is about 1 km.

there are two cable wells in the middle of the cable joint, which is convenient for the maintenance of the cable line.

these cables run continuously for 1 days or so, resulting in an unpleasant odor from the cable wellhead at the mouth of the cable,

less than a week, there will be a power cable thermal breakdown. eventually led to the entire 10kv power cable lines can not be used properly.

the occurrence of the above problems is a typical case of the power cable accident which is lack of scientific understanding of the actual operation of the cable.

a variety of specifications of the low and medium voltage power cables have a theoretical calculation of ampacity, but the actual use of the power cable laying environment,

it is necessary to give full consideration to the thermal resistance correction coefficient of the actual laying environment, and to correct the actual load of power cable,

this must be considered in the design stage before the cable is used, otherwise once the power cable is completed,

will not be able to remedy, resulting in huge economic losses of electricity. a plurality of cables into pvc plastic pipe, seamless random stacking buried,

the thermal resistance coefficient of each power cable is greatly increased compared with that of the power cable.

in the course of the actual operation of the cable, the medium around the cable is mainly plastic pipe and adjacent cable,

instead of pure soil, the thermal resistance will be much larger than that of the soil, and the amount of heat generated by the operation of the power cable in the operation of the power cable is also increasing,

at this time, the actual laying environment of the power cable is not purely direct buried laying, and the actual operation will allow the carrying capacity to drop greatly,

the occurrence of cable thermal breakdown is inevitable. therefore, the actual thermal resistance of cable laying must be taken into account in the early design of cable laying,

correct the design in time, otherwise it will cause huge economic loss.

when a plurality of power cables are randomly stacked side by side gapless accumulation after direct burying,

when a fault occurs in power cable which may be adjacent to one or more of the cable joint burned, spreading and expanding the cause of the accident.

at the same time, it will lead to the occurrence of thermal breakdown. power cable buried root number too much for cable fault repair actual excavation unfavorable,

because of the large number of cables, the chance of mechanical damage caused by the excavation process will be greatly increased,

adjacent power cable may be in the state of power, electric shock accident and two accident caused by the blackout is likely to expand.

for a plurality of power cables are buried at the same time, the number of roots can best control in 6 below, as much as possible during the laying distance,

sufficient heat dissipation space for the power cable, when the cable is selected, the heat dissipation performance of the soil or sand around is fully considered,

in order to ensure the normal and safe use of the power cable, the service life can be fully utilized.