Popularize the specification of AC charging pile cable for electric vehicles

The charging pile cable includes DC charging cable and AC charging cable, both of which have the following characteristics:

First of all, the systems used are different. DC cables are used in the rectified DC transmission system, and AC cables are often used in the power system with power frequency (for example, domestic 50Hz).

Secondly, compared with AC cable, DC cable has less power loss during transmission. The power loss of DC cable is mainly the DC resistance loss of conductor, and the insulation loss is relatively small (the size depends on the current fluctuation after rectification); The AC resistance of low-voltage AC cable is slightly higher than DC resistance, while that of high-voltage cable is obvious, This is mainly due to proximity effect (proximity effect refers to the phenomenon that AC current is close to each other in two conductors of two-wire transmission. The higher the frequency and permeability, the smaller the resistance coefficient, the more significant this phenomenon is) and skin effect (Skin effect refers to skin effect. When the alternating current passes through the conductor, the current will concentrate on the surface of the conductor. This phenomenon is called skin effect. When the current or voltage is conducted in the conductor with high frequency electrons, it will concentrate on the surface of the total conductor, rather than evenly distributed in the cross-sectional area of the whole conductor.) The loss of insulation resistance accounts for a large proportion, mainly the impedance generated by capacitance and inductance.

Thirdly, the DC cable transmission efficiency is high, and the DC transmission has characteristics, so it is difficult to generate induced current and leakage current, and it will not produce electric field interference to other cables laid in the same way; And the installation and maintenance are simple. The cost of DC cable is much lower than that of AC cable. The DC cable has positive and negative poles and simple structure; Low line loss; It is convenient to adjust the current and change the direction of power transmission. AC cable is three-phase four-wire or five-wire system, with high insulation safety requirements, complex structure and higher cable cost than DC cable.

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