应用HCSR和并联灭弧室提高气体断路器开断能力的研究  

Research to Improve the Breaking Capability of Gas Circuit Breakers by Using HCSR and Shunt Arc-extinguishing Chamber

作　　者：武胜斌 姜旭 吴杰 许中 王海斌 王勇 WU Shengbin;JIANG Xu;WU Jie;XU Zhong;WANG Haibin;WANG Yong(Xi＇an XD Electric Research Institute Co., Ltd., Xi＇an 710077, China;Guangzhou Electric Power Supply Co., Ltd., Guangzhou 510620, China)

机构地区：[1]西安西电电气研究院有限责任公司,西安710077 [2]广州供电局有限公司,广州510620

出　　处：《高压电器》2018年第4期8-13,共6页High Voltage Apparatus

摘　　要：高耦合电抗器(HCSR)辅助开断并联灭弧室是解决大电流故障开断的一种有效方法。由于SF_6电弧自身的负伏安特性会影响并联支路电流的同时过零,增加了开断并联SF_6电弧支路的难度,限制了其在高电压领域的应用。结合高耦合电抗器辅助并联支路开断的设计思想,首先利用40.5 kV断路器两柱相同灭弧室,进行了小电流条件下,SF_6电弧并联支路开断的试验研究,重点分析了开断电流大小、燃弧时间长短与均流、限流开断特性间的关系。其次,针对80 kA大电流条件下的并联支路开断特性,进行了单分试验的初步研究和验证。结果表明,在开断小电流、耦合电抗器设计参数不变的情况下,开断的短路电流越小,两柱并联的灭弧室越易实现同步均流开断,随着开断电流的增加,均流开断区间向燃弧时间较长的方向偏移;在开断80 kA大电流时,合理地设计电抗器参数,能够实现并联支路的均流开断,但较难完全避免并联支路限流开断的出现。两轮试验均表明首开支路熄弧后,断口两端的电压瞬间叠加电抗器单臂电感的压降而发生突变,并引起波形振荡,耦合电抗器单臂电感会对线路总电流产生一定的限流作用。HCSR auxiliary breaking shunt arc-extinguishing chamber is one kind of effective method for disposing the failure of large current interruptions. As the negative voltage current characteristic of the SF6 are affects the cur- rents of the parallel branches passing zero simultaneously, the difficulty for breaking shunt SF6 are branch is in- creased, and its applications to the high voltage field is limited. Combining the design idea of shunt branches auxilia- ry breaking with high coupled reactor, experimental studies of the SF6 are shunt branches breaking under lower cur- rents are carried out firstly, using two same arc-extinguishing chambers of a 40.5 kV circuit breaker. The relation- ships of the short current, arcing times, current dividing and current limiting are analyzed in emphasis. Then, aim- ing at the breaking characteristics of larger current 80 kA shunt branches, preliminary study and verification are car- ried out by the opening operations. The results show that in the ease of lower current and constant HCSR parameters, current sharing breaking in the two shunt chambers are easier to achieve with the decrease of the short current. With the increasing of the short current, the current sharing interval deviates to the direction of the longer arcing time. In the ease of larger eurrent with matched HCSR parameters, current sharing breaking of the shunt branches can also be acquired, but the current limiting breaking cannot be avoided absolutely. Two sets of the experiments both indi- cate that after the arc of the first breaking circuit extinguishes, the abrupt change of the breaking voltage and its oscil- lation can be observed due to the potential fall adding from the branch inductance of the reactor, but the total current can be limited to some extent by the branch inductance of the coupled reaetor.

关 键 词：SF6断路器 并联支路 高耦合电抗器 均流开断 限流开断 

分 类 号：TM561[电气工程—电器]