电力系统超短T接线路保护方案研究

A Study on the Protection Scheme for Teed Short Line in Electric Power System

针对110kV电压等级的超短T接线路实际工程需要，根据系统一次接线的特点，分析了超短T接线路不采用常规的阶段式或高频闭锁式纵联保护的原因；在对三端线路光纤闭锁式距离保护和光纤电流纵差保护原理进行研究的基础上，提出了采用光纤通信方式的三端闭锁式距离保护作为过渡方案、最终采用三端光纤电流纵差保护的方案。同时对保护系统使用的光纤系统通信方案进行了探讨。

The reasons why the conventional Step protections or carrier block pilot protections are not used for the Teed short lines are analyed on the basis of the actual engineeringneeds of the 110 kV Teed short lines and the features of the system primary connections. Asa result of the study on the related principles,a transit scheme of the fibre-optic block distance protection and a final scheme of fibre-optic pilot current protection and proposed. Thefibre-optic communication scheme employed by the protection system is also discussed.