新型线路保护装置在练塘变电站的应用

500kV练塘变电站是上海第一座数字化变电站,电压等级高、数字化设备新而且规模大。介绍了一种新型线路保护装置PRS-753,采用相关差动法的工作原理,在上海电网的应用情况。通过对保护装置功能的分析,指出了其在差动保护功能、通道投退和自动化通信接口方面的特殊性和不同之处,提出了保护装置的一些硬件功能,由于设计时考虑不够周全,还需要进一步优化和改进,并且建议加大监测保护装置的健康水平和深度排查隐患,积累数字化变电站的日常运维和处理事故经验,提供同行借鉴。

The Application of a New Line Protection in Liantang Substation

500kV Liantang Substation is the first digital substation in Shanghai with a high voltage level,new digital devices and a large scale.PRS-753,a new protective device,is introduced here with its application in Shanghai power grid,which has adopted a new principle named the relative differential method.Based on the analysis of the new device’s functions,the difference and particularity of its differential function,channel changeover and communication interface is pointed out.Due to some inadequate hardware design,the new protective device needs further optimization and improvement.It is suggested that we should strengthen monitoring its general health and further investigate potential dangers and the experience of the daily operation,maintenance and sudden accident treatments in digital substation should accumulate in order to provide peer reference.