采用数字保护技术提高变电站安全运行水平

以传统的零序电流保护、主变差动保护和电子式差动保护为例,介绍了各自保护原理和进行了类比,验证了由电子式电流互感器构成的差动保护,具有信号传输误差小、保护动作可靠和正确率高的优势。数字化变电站运用电子式互感器保护和光缆通信网络技术,改变了常规变电站的陈旧保护模式,显著提高了数字化变电站保护动作的准确性,对上海电网的安全稳定运行,提供了可靠保证。

Research of the Electronic Protection Technology to Improve the Reliability for the Stability Operation in the Substation

The zero order current protection,the differential transformer protection and the electronic protection are introduced in this paper with their principles analyzed and contrasted.It is verified that the differential protection composed with electronic current transformers has the advantage of small error of signal transmission,reliable protection action and high correct rate.It shows that the conventional substation of obsolescence protection mode is changed by the technology of electronic transformer protection and fiber optic communication network used in the digital substation.The new technology improves the accuracy of the digitized substation protection action significantly.It provide reliability for the stability operation of Shanghai Power Grid.