五段式线路保护方案

The Research on Five-step Protection Scheme for Transmission Line

传统的线路保护一般采用三段式保护方案。为了进一步提高线路保护的性能,提出了一种五段式线路保护新方案。不灵敏Ⅰ段用于提高Ⅰ段保护的动作速度,灵敏Ⅰ段用于提高灵敏度,不灵敏Ⅱ段用于提高区内短路的抗过渡电阻能力和提高动作速度,灵敏Ⅱ段用于提高Ⅱ段保护的灵敏度和提高作为下一线路远后备的动作速度;Ⅲ段保护作为本线路Ⅰ段、Ⅱ段保护的近后备保护,并作为下一线路的远后备。介绍了五段式线路保护方案的优缺点与性能特征。分析表明,在线路保护装置由微机构成的条件下,不增加微机保护硬件的条件,就可提高线路保护的性能。

Traditional protection scheme for transmission line usually adopts three-step protection scheme. To promote the property of transmission line protection, this paper presents a new protection scheme for transmission line that is five-step protection scheme. The insensitive zone Ⅰ is used to improve the operating speed of zone Ⅰ of transmission line protection. The sensitive zone Ⅰ is used to improve the sensitivity of zone Ⅰ . The insensitive zone Ⅱ is used to improve the operating speed of zone Ⅱ of transmission line protection, and it is also used to enhance property to detect arc-resistance fault. The sensitive zone Ⅱ is used to improve the protection sensitivity of zone Ⅱ and is used to improve the operating speed of backup protection of the next circuit. Zone Ⅲ is used as the backup protection of the transmission line and also used as the backup protection of the next circuit. The paper analyzes the characteristics of the new protection scheme for transmission line. The analysis results show that if the protection relay is made up of microcomputers, the property of transmission line protection can be improved without increasing the hardware of microcomputer protection relay.