Power cables used in parallel should pay attention to the following points

1. parallel use of two power cables, better cable type specifications length unity, so that when the cable is energized to run, the two power cables of various types of parameters are basically close to the basic distribution of carrying capacity is basically uniform, there will not be a single cable overloaded, in advance of the phenomenon of a large area of heating and burning. 2. parallel operation of cables, the distance between each other to be considered as appropriate to amplify, so that when a cable faults, also Won't wave next to the parallel use of the cable burned at the same time, which to a certain extent reduces the enterprise's power economic losses. 3. is the parallel operation of power cables, to the cable ends of the line nose and switch contact connection status, often check to ensure that the cable is connected to the switch is good, because most of the parallel use of the cable is more than 35mm2, each kilometer conductor resistance are below zero ohms, resistance of the Order of magnitude in 10-1 or so, if the cable wire nose and switch contact is not good, it is easy to lead to a cable at the switch of a phase or several phases of the contact resistance is too large, resulting in uneven distribution of the two cable current-carrying capacity, and now the cable customers to take into account the economy and grid design, the choice of the cable model specifications will not leave too much of the current-carrying capacity of the residual amount of when the wire nose at the contact resistance is too large, a continuous use of this place When the contact resistance at the wire nose is too large, one is the continuous use of the heat burnt burnt, and the other is to cause the two cables load capacity offset, resulting in one of the cables overheating burnt. 4. is multi-core armored power cables are used in parallel in the AC power grid, each cable must be A-phase, B-phase, C-phase alone out of the A, B, C-phase, respectively, and switch A, B, C-phase parallel, is forbidden to a cable all the cores shorted to the switch of the one-phase connection. It is strictly forbidden to connect all the cores of a cable to one phase of the switch after shorting, because the cable is equal to single-phase operation with electricity, and the single-phase alternating current will generate eddy current in the steel belt, which will lead to the accident of cable thermal burnout.

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