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本文就地方电网安全运行有关的继电保护及自动化等方面所存在的问题,作粗浅分析,以期得到合理解决。一、地方电网继电保护问题当前6～35千伏线路普遍采用电流三段式保护。这种保护方式对电源容量大的线路效果比较好,保护的选择性和灵敏度都能达到要求。但是用于小容量地方电网,情况就不同。多数小水电站输电线路容量小,线路短,加之小水电多为迳流电站,一年中由于天然来水变化大,电站开机台数经常变化,采用电流三段式保护效果就非常差。上述情
In this paper, the local power grid security operations related to the protection and automation aspects of the problems, make a superficial analysis, with a view to get a reasonable solution. First, the local power grid relay protection Currently 6 ~ 35 kV lines commonly used current three-stage protection. This protection of the power supply capacity of the line is better, the selectivity and sensitivity of protection can meet the requirements. But for small-capacity local power grid, the situation is different. Most small hydropower transmission line capacity is small, short lines, combined with small hydropower Chufan power station, a year due to changes in natural water, power plant often change the number of stations, the use of current three-stage protection effect is very poor. The above situation