摘要
通过一起线路保护拒动造成330kV变电站全站失压事件的分析,指出在微机保护主、后一体化配置情况下,当线路发生故障而由于装置自身或相关设备原因造成主保护拒动时,装置内的后备保护也难以可靠出口,只能依靠相邻线路的后备保护切除故障。在采用近后备方式条件下,相邻线路保护会由于灵敏度不足而无法可靠动作,从而导致事故范围进一步扩大。为此,提出超高压线路保护可采用近后备与远后备相结合的方式,距离Ⅲ段主要作为相邻线路故障的后备保护,应对相邻线路故障有灵敏度。详细介绍了距离Ⅲ段的整定计算原则,并分析了应用中需注意的问题。所提方法提升了线路保护保障电网安全稳定运行的能力。
An operation-failure of line protection at fault is analyzed in this paper, which has led to the voltage collapse of a 330 kV substation. The results show that under the integration configuration of primary and backup protection, if primary protection fails to operate for reasons of the protection device itself or related equipments when fault occurs, the backup protection is also hardly operable, while only the backup protection in the adjacent line can be relied on to remove faults. Unfortunately, the adjacent line protection is usually unable to operate because of insufficient sensitivity since it is based on the local backup mode, which frequently leads to further expansion of the accident. To solve this problem, the combination of local and remote backup is introduced into the extra high voltage （EHV） transmission line protection. Accordingly, distance section llI is employed as backup protection for the adjacent line and adequate sensitivity to it is required. Finally, the setting calculation method for distance section Ill is presented and problems for attention in engineering application are discussed as well. This scheme has greatly improved the ability of line protection to protect the power system.
出处
《电力系统自动化》
EI
CSCD
北大核心
2016年第8期120-125,共6页
Automation of Electric Power Systems
关键词
超高压线路
远后备
距离保护
灵敏度
整定计算
extra high voltage （EHV） transmission line
remote backup
distance protection
sensitivity
setting calculation
