Transformer in power system is a main equipment in the production process. In the whole process from power generation to power supply, transformers must be converted at least three times, especially distribution transformers with large capacity, large quantity and large total loss. The loss of distribution transformer accounts for more than 80% of the loss of 10KV line, so it is very important to reduce the loss of distribution transformer in the whole distribution network. The main technical measures to reduce transformer loss and save electric energy are to improve the power factor, to control the number of transformer operation reasonably and stop light load transformer and to adopt variable capacity transformer.
Take measures to reduce the reactive power consumption of power supply equipment to improve the power factor. Large reactive power consumption will lead to the increase of current, increase the capacity of power supply system and transformer, and increase the power loss of power supply line and transformer. Under the condition of constant load current, the total current also decreases when the reactive current is reduced .According to load, active power and reactive power loss characteristics and no power economic equivalent, the enterprise substation should calculate the most economical operation number. To minimize the total power loss of the transformer, the operation mode with the minimum power loss is called the economic operation mode of the transformer. If the load rate of each transformer is low, the transformer with the lowest load rate and combined load will save energy. However, according to different conditions, sometimes when the transformer is stopped, the loss of the transformer with increased load is larger than that of the transformer with stopped load. At this time, economic comparison of power saving effect is needed.
For seasonal load (such as agricultural load), the capacity load of the transformer is selected according to the peak season of the year. After the peak season, the transformer often moves under light load. In this case, it is an effective measure to reduce the power loss by changing the connection mode of transformer with variable capacity to adapt to the change of load. Reactive power will not only reduce the utilization rate of power facilities, but also increase the line loss of power system. Reasonable compensation for the reactive power generated, reducing the total reactive power of the system, all have a certain power saving effect.