自耦变压器推广应用的技术经济分析

Technical and economic analysis of autotransformer for its extended application

通过介绍自耦变压器的原理及其在电网中的运用情况,分析了目前在推广应用自耦变压器过程中普遍存在误区,如单相短路电流、继电保护控制较困难等问题。研究发现,对于单相短路电流过高的问题,可以通过加装中性点电抗器的方式解决;对于继电保护配置较困难问题,由于目前继电保护均实现了微机化,其中的距离保护比零序保护稳定性高,从江苏电网运行情况看,采用自耦变压器不会对运行产生影响。自耦变压器的应用是电网企业节能降本的重要举措,应予大力推广。

The principle of autotransformer and its application in power grid were introduced. The common misperception of the use of autotransformer was analyzed such as single-phase short circuit current and protection relay control. The study results show that single-phase short circuit current can be controlled by using neutral-point reactor, and microcomputer-based protection, including the distance protection, is more steady than zero sequence protection. Tile use of autotransformer in Jiangsu power grid has no influence on the power grid operation. The utilization of autotransformer is an important way for the energy-saving and cost-reducing in electric power grid.