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发挥继电器最佳状态 提高电力输送稳定性

2014/7/11 13:21:58点击:
继电器一般都有能反映一定输入变量(如电流、电压、功率、阻抗、频率、温度、压力、速度、光等)的感应机构(输入部分);有能对被控电路实现“通”、“断”控制的执行机构(输出部分);在继电器的输入部分和输出部分之间,还有对输入量进行耦合隔离,功能处理和对输出部分进行驱动的中间机构(驱动部分)。

在继电器应用过程中一定要注意让其处于最佳状态,这样才能提高电力输配的稳定性,对电力输配起到智能调节作用。

继电器的工作状态主要是指输进信号对线圈的作用状态。继电器线圈的设计是对应于不同的输进信号状态的,有长期连续作用的信号,有短期重复工作(脉冲)信号。连续工作是指线圈能连续地承受工作信号的长期作用。对脉冲信号还要考虑脉冲频率、通断比等。因此,要根据信号特点选用适合于不同工作状态的继电器,一般不答应随便使用,特别要留意不能将短期工作状态的继电器使用在连续工作状态,高温工作条件下尤其要留意。在实际切换功率负载或大功率负载时,尤其要考虑不宜切换速率过高。一般应少于10~20次/min.最大循环速率为:0.1次/(最大吸合时间+最大开释时间)s

继电器除需满足在各种稳态的线路和环境条件下工作的要求外,还必须考虑到各种动态特性,即吸合时间、开释时间,由于电流的波动因素造成的抖动,以及触点碰撞造成的回跳等。

继电器的额定负载是指在规定的动作次数(寿命)内,在规定动作频率下,触点所能切换的纯阻性负载的大小。显然,负载增大,继电器的寿命将缩短,但不存在一个通用的负载寿命对应关系,不同的继电用具有不同的负载与寿命的关系曲线,即寿命曲线。因此,在使用继电器的过程中根据电网、电路、电器原不同情况,应该实时做出调节,以最大限度的延长其使用寿命。