描述
继电保护装置应满足可靠性、选择性、灵敏性和速动性的要求:这四“性”之间紧密联系,既矛盾又统一。
可靠性是指保护该动体时应可靠动作。不该动作时应可靠不动作。可靠性是对继电保护装置性能的最根本的要求。
选择性是指首先由故障设备或线路本身的保护切除故障,当故障设备或线路本身的保护或断路器拒动时,才允许由相邻设备保护、线路保护或断路器失灵保护切除故障。为保证对相邻设备和线路有配合要求的保护和同一保护内有配合要求的两元件(如启动与跳闸元件或闭锁与动作元件)的选择性,其灵敏系数及动作时间,在一般情况下应相互配合。
灵敏性是指在设备或线路的被保护范围内发生金属性短路时,保护装置应具有必要的灵敏系数,各类保护的最小灵敏系数在规程中有具体规定。选择性和灵敏性的要求,通过继电保护的整定实现。
速动性是指保护装置应尽快地切除短路故障,其目的是提高系统稳定性,减轻故障设备和线路的损坏程度,缩小故障波及范围,提高自动重合闸和备用电源或备用设备自动投入的效果等。一般从装设速动保护(如高频保护、差动保护)、充分发挥零序接地瞬时段保护及相间速断保护的作用、减少继电器固有动作时间和断路器跳闸时间等方面入手来提高速动性。针对线路长出故障和易出故障的地点进行有计划有重点的巡视,一旦发现线路故障要及时处理防止出现跳闸事件影响电力的稳定运行。一般来说电路巡线人员要具备以下几点要求:首先,要具有良好的身体素质,因为无论酷暑还是严寒甚至台风、暴雨天气,巡线人员都需要对供电线路进行安全巡视,所以身体素质的好坏直接影响巡查的质量;其次,巡线人员要具有高度的责任心,只有巡线工作保质保量进行,才能确保故障的及时发现并处理;再次,要敢于直面问题,当供电现场发生临时故障,有时是可以直接指出并加以制止,使故障可以在第一时间被排除。总之,无论在任何情况下都要随机应变,要把尽快解决故障确保供电线路安全稳定运行放到第一位。线路发生故障的原因有很多种,有环境因素导致的、有不可避免的工程遗留问题导致的,因为故障原因的多样化,所以电力巡线人员在巡视中就更要认真仔细,尽最大力量排除电力隐患。
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