What is the meaning of the national standard BVR?
Some industrial and mining enterprises and chemical enterprises to the newly expanded technical transformation projects, power cables in parallel with the power supply, in parallel use, the two cables must be evenly distributed distribution, otherwise it will lead to thermal breakdown of the cable failure
Therefore, when the cables are running at the time of power supply, the two power cables are basically close to each other and the distribution of the current is basically uniform Too heavy, ahead of a large area of ??fever burning phenomenon 3 Parallel operation of the cable, the distance between each other to consider the appropriate amplification, so that when a cable failure, it will not affect the parallel use of the cable at the same time burned, which to a certain extent, reduce the power of economic losses The 4 Parallel operation of the power cable, the cable at both ends of the nose and the switch contact with the contact state, regular checks to ensure that the cable and switch connection is good, because the parallel use of the cable mostly in 35mm2 above the conductor resistance per kilometer in the zero Ohm below, the resistance of the order of magnitude in the 10-1 or so, if the cable nose and switch contact is not good, it is easy to lead to a switch at the cable of a phase or a few phase contact resistance is too large, resulting in two cable carrying capacity allocation is not Uniform, and now the cable customers to take into account the economy and power grid design, cable model specifications will not leave too much capacity of the remaining capacity, when the line nose contact resistance is too large, one is the continuous use of the fever burned Off, and that is caused by two cable carrying capacity shift, resulting in one of the cable overheating burned 5 Multi-core armored power cable in parallel use in the AC power grid, each cable must be A phase, B phase, C phase alone out, respectively, with the switch A, B, C three-phase, Connect all the cores of a cable to a phase of the switch
2 When the two power cables are used in parallel, the length of the model specifications is best to be unified
