描述
线路跳闸是输电线路中频繁发生的故障之一,这种故障一般是由设备自身原因、外部环境因素或者工作人员人为因素等原因造成的。一旦线路出现跳闸故障就会导致整条输电线路的瘫痪,而这种故障如不能及时发现并解决将会对人民的正常生活带来不便甚至会给企业造成不同程度经济损失。因此在日常巡线时都要仔细排查,尽量避免跳闸事故的发生,我们还要对线路运行和易出故障的位置详细的分析,总结其发生的规律,有依据地采取适当防护措施,保证线路的安全稳定运行。 在铺设输电线路时,电力工作人员应该根据铺设线路的周边环境选择最经济实用的电缆。例如油纸电缆其起源比较早制作工艺比较完善,结构简单制作工艺也比较简单,但它有一个缺陷就是熔点低绝缘油容易受热流淌,在进行高压差敷设时,电缆的绝缘油就会从高处流往低处,从而导致高处的绝缘绝缘层干枯降低了其自身的绝缘性能,低处由于油压的增多会引起铅包龟裂最终导致故障的发生。因此铺设输电线路时电缆的选择就显得尤为重要,现在电力系统一般均使用交联聚乙烯绝缘电缆,这样既可以避免高落差影响下的故障发生又扩大了电缆的输送容量。 如果将铺设电缆线路的周边环境中含有酸碱等腐蚀性物质或存在地下污水,我们在铺设前就要考虑可否更换位置铺设或者采取有效的防污措施。针对这一问题就要求我们的电力设计人员在勘察铺设线路时一点要仔细调查并认真询问当地的地址污染情况。 一般在电缆铺设完毕后都会在铺设地点设置标示牌,以避免其他施工人员因不知道地下铺设电缆而造成电缆的挖掘损坏或者在此处堆砌重物。随着时间的推移,有些标示牌会出现标示不清楚的问题,这就要求我们巡线人员及时发现并处理,以确保线路的安全运行。一个输电线路能否正常运行完全由电缆工程施工的质量决定,如果施工时质量达标、运行方式妥当就可以保障电路安全持久稳定的运行。我们在日常工作中一定要对电缆的施工和运行人员进行技术培训,用以提高他们的技术水平,最终减少人为造成的故障发生。 根据电力电缆运行规程所述,线路运行时不允许有过负荷电流产生从而过负荷运行,一旦过负荷运行就会导致电缆线温度升高,这样电缆线就会老化从而影响其的使用寿命,降低了本身的绝缘性能。线路中一旦有绝缘性能薄弱的地方就有可能发生击穿事故。因此我们一定要加强电流的监控,避免因过负荷造成的击穿事故的发生。
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