High overload distribution transformer is a kind of distribution transformer developed to solve the short-term sharp increase in electrical load.
The sharp increase in short-term electricity load refers to: it is in a light load state for most of the year, but there are ten days or half a month when the load increases sharply, exceeding the rated load by 1.5 times or even 2 times, and the load is concentrated in 2- The load situation within 3 hours, such as the Spring Festival load, busy farming load, etc. in rural power grids.
Advantages of high overload distribution transformers
1. In view of the special usage situation in rural areas where the annual average load rate is low and the load increases significantly in a short period of time during the Spring Festival and busy farming periods, on the premise of ensuring the basic power capacity, it can not only meet the long-term power demand of small loads, but also take into account the Load short-term electricity demand.
2. High overload capacity distribution transformers have the characteristics of energy saving, high efficiency, environmental protection, small no-load current, low reactive power loss, and strong ability to withstand sudden short circuits.
What grid is suitable for high overload distribution transformer?
High overload distribution transformer technology is mainly developed to ensure the economy and safety of rural power grid operations.
The average annual load rate of rural power grids is low, but the electricity load period is concentrated. The load increases sharply during the Spring Festival, which can easily cause conventional transformers to be seriously overloaded or even burned out in a short period of time. However, the capacity of the transformer cannot be artificially increased, causing the phenomenon of "big horse and small cart", which is not in line with the economical operation of the power grid.
Research and development basis for high overload distribution transformers
Developed based on the "Technical Guidelines for Rural Power Grid High Overload Capacity Distribution Transformers" issued by the State Grid Corporation of China in June 2014.
Overload capacity of high overload distribution transformers
According to the load characteristics of rural power grids, the following overload requirements must be met without affecting the normal service life of the transformer.
1. 1.5 times rated capacity operation for 6 hours;
2. Run at 1.75 times rated capacity for 3 hours;
3. Run at 2 times the rated capacity for 1 hour.