What specification cables are needed for electric vehicle charging piles

What specification cables are needed for electric vehicle charging piles

1. Charging piles are divided into single-phase and three-phase. Regardless of two-phase or single-phase, the first step is to convert to the AC incoming current.

(1) For single-phase charging piles (AC charging piles) I=P/U

(2) For three-phase charging piles (DC charging piles) I=P/(U*1.732)

After calculating the current in this way, select the cable according to the magnitude of the current.

2. Cable selection can be based on relevant manuals or procedures such as:

(1) The single-phase charging pile is generally 7KW (AC charging pile) I=P/U=7000/220=32A, and a copper core cable of 4 square millimeters should be used.

(2) Three-phase charging pile (DC pile)

15KW current 23A cable 4 square millimeters

30KW current 46A cable 10 square millimeters

60KW current 92A cable 25 square millimeters

90KW current 120A cable 35 square millimeters

All charging piles should have a neutral wire and a ground wire. Therefore, a single-phase three-core cable is required, and a three-phase five-core cable is required.

As the electric vehicle charging pile (bolt) on the power distribution side of the power grid, its structure determines that the characteristics of the automatic communication system are many and scattered measured points, wide coverage, and short communication distance. And with the development of the city, the network topology requires a flexible and scalable structure. Therefore, the selection of the communication mode of the electric vehicle charging pile (bolt) should consider the following issues:

(1) Communication reliability - the communication system must withstand the test of harsh environment and strong electromagnetic interference or noise interference for a long time, and keep the communication smooth.

(2) Construction cost - under the premise of satisfying the reliability, comprehensively consider the construction cost and the cost of long-term use and maintenance.

(3) Two-way communication - not only can realize the upload of information volume, but also realize the release of control volume.

(4) Multi-service data transmission rate——With the continuous growth of terminal business volume in the future, the communication between the main station and the sub-station, and the sub-station to the terminal requires higher and higher data transmission rates to realize multi-service.

(5) Flexibility and scalability of communication - because charging piles (bolts) have the characteristics of many control points, wide areas and decentralization, standard communication protocols are required. With the development of "ALL IP" network technology trends As well as the continuous growth of power operation business, IP-based service bearer needs to be considered, and at the same time, it is required to facilitate installation, commissioning, operation, and maintenance.