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真空断路器的真空下降以及漏气的原因

2013/11/22 10:17:19      点击:
一、分合闸速度的影响
     断路器的分合闸速度对真空断路器的灭弧起到了一定的作用,也决定着真空断路器的使用寿命。所以断路器在投运前均应测量分合闸速度,可以及时发现产品质量和调试上的一些问题。一方面防止分合闸速度过大,断路器触头动作终了时机械撞激烈,使灭弧室产生更为严重震动。
二、操作机构容量的影响
    真空断路器现常见的操作机构主要有CDlO型、CDl7型、VSl型以及在上述型号的基础上,为适应不同的安装空间而改造的操作机构,近几年国内部分断路器又配用了“永磁式操作机构”。
配置不同型式的操作机构,在安装或改造时,均应着重注意操作传动杆的动作距离,如果容量偏大,将对灭弧室产生严重撞击,造成真空灭弧室波纹管损坏,直接影响真空断路器的使用寿命,使断路器真空度降低速度加快。
三、缓冲器的影响
     应仔细检查缓冲器行程,不应有变形损伤现象或压缩超量,须留缓冲裕度。部分充油缓冲器应定时检查缓冲器油位情况,及时补油。
四、弹跳的影响
      真空断路器的触头多为平面对接式结构,在分合闸操作中不可避免地产生不同程度的反弹现象。不论分闸反弹还是合闸反弹都会给运行带来危害:波纹管经受强迫振动可能产生裂纹,使灭弧室漏气;分合闸时断路器触头运动速度较高,动作终结时冲击力较大,引发弹跳,可能产生触头和导电杆的变形,甚至产生裂纹;切合电容器组的真空断路器如果发生合闸弹跳,还会导致电容器的损坏。
     因此目前部分真空断路器厂家已注意到真空断路器弹跳造成的危害,推出了所谓的“无弹跳”真空断路器,通过机械缓冲等手段,大大减少了断路器在分合闸时产生的机械冲击。
五、触头行程的影响
     目前国内生产的各种型号的10kv真空断路器灭弧室,其触头超行程按规程规定在4mm左右,开距11mm左右。真空断路器在安装或检修时,应严格按照产品安装说明书中触头行程要求准确测量,调整拉杆,防止行程超越,且真空断路器在每年大检修中,都应仔细复查断路器的行程、超行程及触头的开距。在实际运行中不乏因断路器超行程调整不当,造成断路器合闸过程中机械冲击引起灭弧室破裂、导电杆变形的事故。
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