The distribution transformers are fiercely competitive. Faced with the pressure of high raw material costs, and the insufficiency of energy conservation evaluation system construction and market supervision and management, the higher initial investment faced by energy-saving transformers has made the promotion of energy-saving transformers difficult.
Although the development of China's transformer energy-saving standard policy is late, it is fast. With the further revision and advancement of the energy efficiency standard for distribution transformers, it will be at the same level as the highest energy efficiency standards in developed countries. Whether from energy conservation or technical strength, China's transformer industry will be at the forefront of the development of transformers in the world. More importantly, the energy-saving of transformers is not only reflected in the definitive value of the loss specified in the ex-factory equipments of transformers, but also the establishment of the life-cycle management mode of the users. For the economical operation and management of the transformers, the maximum value of the energy-saving of the products can be realized. Realize the real benefits of transformer energy saving.
During the operation of the distribution transformer, there is an underload due to the capacity being too large, and the device may be overheated or even burned due to overload or overcurrent operation. The improper selection of such device capacity affects the reliability and economy of the power supply system.
The capacity of the transformer is selected on the basis of load statistics. Because the load is not expected to be accurate, it is generally chosen according to the expected maximum load. As a result of this selection, the capacity is often set to be too large, which has an adverse effect on the operation of the power system. If the economic operation option is used, it is the condition that the copper loss and the iron loss of the transformer are equal, and the maximum economic load ratio of the transformer and the rated capacity and the maximum load ratio of the transformer are derived. Since the actual operating load is not necessarily the maximum load that the load counts, and the load is random, the operating efficiency is variable, and its economic operating benefit is difficult to achieve.