How To Configure A Box Substation For Electric Vehicle Charging Piles (Selection Of Box Substations For Charging Stations)
05-01 2025 | By:
The charging pile box substation is the power distribution part of the entire charging station system. Its box substation is manufactured and assembled by a special complete set manufacturer according to the drawings.
The charging pile box substation is a pre-installed substation customized by the box transformer manufacturer according to the ratio during the installation of the charging pile of the electric vehicle charging station. The current charging pile box transformer is generally based on European box transformers. European box transformers are relatively good in load capacity and stable reliability of power supply, and are used by most charging stations.
The power distribution process of the charging station includes two parts: power transformers from 10KV to 380V, and from the 380V transformer end to the charging pile. The most important power conversion and supply equipment in the middle is the box substation. Due to policy requirements in different regions, the requirements for customized and purchased box transformers are not the same.
The capacity of the transformer can be calculated by the following formula:
800kVA box transformer
Total load required by the charging station = total output power of the charging pile/average efficiency/line and reactive power loss coefficient*simultaneous utilization coefficient efficiency of the charger (average efficiency 0.9, line and reactive power loss coefficient 0.9, simultaneous utilization coefficient efficiency of the charger 0.85). Common specifications of charging pile box transformers are: 630KVA, 800kva, 1250kva, 1600kva, etc. According to procurement costs, energy consumption requirements, etc., transformers can be oil-immersed and dry.
If a charging station has 10 charging piles and is equipped with 120KW piles, the total load of the required transformer is calculated according to the above formula: (10*120)/0.9/0.9*0.85=1259KVA. Different types of box transformers will also have a variety of configuration components, such as circuit breakers, load switches, current and voltage transformers, etc., which work together to ensure the safety and efficiency of charging.
You may also find these interesting:
