输电线路差动保护技术研究进展

Research advances of transmission line differential protection technology

输电线路差动保护原理简单,保护范围明确,动作不需延时,被广泛用做线路的主保护。本文介绍了目前国内差动保护的研究最新进展,详细介绍了如何解决超高压、特高压中分布电容电流,以及差动保护应用在同杆多回线路、T型接线线路上遇到的难点问题。

Transmission line differential protection principle is simple,has clear protection scope,action without delay and is widely used as the primary protection circuit.This article describes the latest developments of the current domestic differential protection,introduces in detail how to solve the distribution capacitors current in the extra-high voltage and ultra-high voltage lines,and difficult problems in the application of differential protection of multi-circuit lines on the same pole and T-type connection line.