今年以来,我国经济持续发展,对电力的需求持续增加,由于有些地区投资过热,有些产业盲目开发,特别是高耗能产业,新增供电能力跟不上需求,电力供应十分紧张。继电保护作为保障电力系统安全的屏障,一直担当着电力系统安全卫士的重要角色,历史和现实的经验、教训都证明几乎所有大的 Since the beginning of this year, China’s economy has been developing continuously. As a result, the demand for electricity has been on the rise. Some industries have over-heated their investments and blindly developed some industries, especially those with high energy-consuming industries. As a protective barrier to power system safety, relay protection plays an important role in power system security guards. Historical and realistic experiences and lessons prove that almost all major