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How to solve the problem of copper and aluminium wiring of transmission lines
2022-02-17
In the enterprise or civil power transmission line often encountered copper row, aluminium row, copper and aluminium cable, terminal blocks between each other electrical connection problems. In these connections, as long as the two ends of the connection is copper and aluminium two different materials, will encounter copper and aluminium joints. According to historical experience, copper and aluminium connection, such as not to take certain measures, it is easy to heat, corrosion, disconnection at the point of connection and the power supply line disconnection, short circuit, blackout and other electrical failures.
To think of copper and aluminium joints like the same material joints as solid and constant, there are several measures:
1, aluminium wire connected to copper terminals (such as aluminium cable to the air switch), need to use copper and aluminium transition terminals (wire nose), this copper and aluminium transition terminals, copper and aluminium is a casting combination, the contact surface is a molecular gap, there will be no copper and aluminium joints of the ills.
2、Copper and aluminium connected to copper wire: with copper and aluminium transition junction tube.
3, copper wire to aluminium row: the use of copper tube aluminium head copper and aluminium transition line terminals, but because of this terminal dosage is small, the market is not easy to buy, the author's practice is to take the method of joints in the aluminium row first with a number of bolts crimped on a piece of copper row, in the copper row side of the copper line terminal can be used as long as the contact surface is sufficiently large, but also can be solved the problem of the copper-aluminium joints.
4, aluminium row connected to the copper row: to be more than two times the length of the same metal than ordinary superposition, and more bolts compaction.
5、Aluminium row to the air switch: first connect a section of copper row on the air switch, and then do it according to the fourth article.
6, in the aluminium row joints coated with a small amount of white petroleum jelly can reduce corrosion of aluminium rows.