Research On Application Of The High Overload Distribution Transformer In Rural Power Grid

Distribution transformer with high overload capacity has many excellent characteristics:energy saving, high efficiency, environmental protection, small idle current, lower reactive power loss, and strong ability to resist sudden short circuit, such transformer is applied more and more widely in rural power network,which is low annual average load, strongly seasonality of load. Application with high overload reduces the one-off investment cost and operation cost, and reduced with loss, improve the efficiency of the investment rate of return.Rural power network has many characteristics:load decentralization, strong seasonality, lower average load rate, peak valley of the characteristics of big difference in the special period, such as the Spring Festival. during the rural busy season the load is growing rapidly, ordinary transformer overload problem is very outstanding. for the equipment safe and reliable power supply,it will cause serious influence badly. Compared with the capacity insufficient margin of normal distribution, high overload transformer won’t be burned, and the voltage won’t be too low, especially in seasonal peak period of production and life. It safeguard the residents electricity production and living, aslo achieved good social benefits. At present, high overload with variable in the application of rural power nerwork have done pilot, and carried out some research. But as a result of investment model and psychological safety factors influence, the high overload transformer are not comprehensive promotion. And new high overload transformer with variable in both the technical point of view, has a theoretical support and economic Angle, and from pilot operation experience, the load characteristics of the suitable area for high overload transformer with applications to be both safe and economic, the influence is significant.Combination of lishui rural productive living energy consumption and load characteristic, according to high overload with variable boundary conditions, we choose suitable for high overload with application area to pilot application of changeable, the area voltage qualified rate and power will be increased and verified with safety and economy of changeable, not only which reduced the cost of investment, investment efficiency is higher, but also it can meet the needs of the rural short-term peak load.