斷路器三相不一致保護(hù)可靠性分析及改進(jìn)措施
李清泉,胡云龍,常高頌,馮知海
(國(guó)網(wǎng)山東省電力公司檢修公司,山東 濟(jì)南 250018)
摘 要:為了提高斷路器三相不一致保護(hù)的動(dòng)作可靠性,從斷路器本體三相不一致保護(hù)和微機(jī)三相不一致保護(hù)的原理構(gòu)成、存在的問題等入手,分析了導(dǎo)致三相不一致保護(hù)不正確動(dòng)作的因素,并結(jié)合以上兩種三相不一致保護(hù)的優(yōu)點(diǎn),提出一種新型三相不一致保護(hù)控制回路, 該保護(hù)控制回路增加了繼電器和觸點(diǎn)的數(shù)目并改變了原有的拓?fù)浣Y(jié)構(gòu)。對(duì)比傳統(tǒng)三相不一致控制回路中存在的器件易老化、時(shí)間繼電器可靠性差等不足, 該回路具有對(duì)器件依賴性低、防老化性能更好、可靠性更高的特點(diǎn)。
關(guān)鍵詞:斷路器;三相不一致;本體保護(hù);微機(jī)保護(hù)
中圖分類號(hào):TM561 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2019)09-0036-03
Reliability Analysis and Improvement Measures of Three-Phase Inconsistent Protection for Circuit Breakers
LI Qing-quan, HU Yun-long, CHANG Gao-song, FENG Zhi-hai
(State Grid Shandong Power Supply Maintenance Company, Jinan 250018, China)
Abstract: In order to improve the operational reliability of three-phase inconsistent protection of circuit breaker, starting with the principle and problems of three-phase inconsistent protection of circuit breaker, this paper analyzed the factors leading to incorrect operation of threephase inconsistent protection. Combining with the above two kinds of three-phase inconsistent protection advantages, this paper proposed a kind of new type three-phase inconsistent protection control loop, which increased the number of relays and contactors and changed the original topological structure. Compared with the insufficiencies of easily aged devices, low reliable relays in the traditional three-phase inconsistent control loop, this control loop has the characteristics of low dependency of devices, better anti-aged performance and high reliability.
Key words: circuit breaker; three-phase inconsistency; ontological protection; microcomputer protection
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