Parallel cable fault

Power cable USES the way of power supply in parallel, is inevitable, when used in the parallel connection of power cable, high voltage cable reminds everybody must make two cables carrying capacity distribution uniformity, otherwise will cause thermal breakdown failure within the cable.

Multi-fiber sheathed power cable used in the ac power grid in parallel, each cable must be of A, B, C phase out alone, respectively with the switch of A, B, C three-phase and, it is strictly prohibited to all the line will be A cable core sub switch after A mutually connected. Because this cable is in charge of single-phase operation, single-phase alternating current can produce eddy current in the cable in the steel strip hot burning accident.

Parallel operation of the cable, the distance between each other to consider appropriate amplifier, such as a cable failure, will not be affected by parallel use of cable burned at the same time, it to a certain extent, reduce the power of enterprise economic losses.

Parallel operation of the power cable to cable two ends connected to the switch contact point contact condition, the nose often checks, ensure that the cable connected to the switch is good because the parallel cable used in more than 35 was mostly, conductor resistance is below zero ohms per kilometer, the resistance of the order of magnitude of around 10-1, if cable nose with switch contact is not good, could easily lead to the switch in one phase of a cable or a few contact resistance is too large, lead to two cables carrying capacity distribution non-uniform.

Now cable customers consider the economy and network design, the choice of cable specifications will not leave the carrying capacity of allowance, when line nose the contact resistance is too large, it is continuous use of the fever burn out, moreover is to cause a shift of the two cables carrying capacity, burned led to one of the cable overheating. Parallel use of two power cables, the best length of cable specifications and unified, so in the operation of the electric cable, power cable basic close to all kinds of parameters, two basic uniform distribution of carrying capacity, there will not be a single cable load is overweight, huge fever burned phenomenon has appeared in advance. 

Above is the time when the cable is used in parallel fault occur.