Rockwell Allen-Bradley 1756PA72 1756PA75
针对高压开关柜的不同故障类型，相应有不同的故障检测方法：
(1)机械特性在线检测，其监测的内容有：合、分闸线圈回路，合、分闸线圈电流、电压，断路器动触头行程，断路器触头速度，合闸弹簧状态，断路器动作过程中的机械振动，断路器操作次数统计等。
目前，断路器机械状态监测主要有行程和速度的监测，操作过程中振动信号的监测等。断路器操作时的机械振动信号监测是根据每个振动信号出现时间的变化、峰值的变化，结合分、合闸线圈电流波形来判断断路器的机械状态。机械性能稳定的断路器，其分、合闸振动波形的各峰值大小和各峰值间的时间差是相对稳定的。振动信号是否发生变化的判别依据是对新断路器或大修后的断路器进行多次分、合闸试验测试，记录稳定的振动波形，作为该断路器的特征波形"***"，将以后测到的振动波形，与"***"比较，以判别断路器机械特性是否正常。根据径向基函数网络理论(RBF网络)，将健康振动信号和断路器实际振动信号波峰幅值之差形成的残差以及冲击事件发生的时间作为断路器故障诊断的特征参数，来判断断路器是否故障及故障类型。基于小波变换的信号奇异性检测理论，对断路器合闸时的振动信号首***行小波去噪处理，提纯有用信号。然后利用Hilbert变换提取信号包络，对包络进行小波变换取得各尺度上的信号波形。***后根据小波变换各尺度上模极大值的传递性来计算信号包络波峰的奇异性指数，以此作为断路器故障诊断的一种特征参数，是一种新颖而比较有效的方法。
行程-时间特性监测是指通过光电传感器，将连续变化的位移量变成一系列电脉冲信号。记录该脉冲的个数，就可以实现动触头全行程参数的测量;同时，记录每一个电脉冲产生的时刻值，就可计算出动触头运动过程中的***大速度和平均速度。因此测得断路器主轴连动杆的分合闸特性，即可反映动触头的特性。监测储能电机负荷电流和启动次数可反映负载(液压操作机构)的工作状况，也可判断电机是否正常,同时反映液压操作机构密
(2)电气性能在线监测包括断路器开断电流加权值、灭弧室真空度等的监测。利用不同开断电流下的等效磨损曲线，累计每次电流开断所对应的相对电磨损，每台断路器的允许电磨损总量由其额定短路开断电流及允许开断满容量次数来标定，采用触头累积磨损量作为判断其电寿命的依据。阐述了影响真空断路器和某些SF6断路器触头寿命的因素，提出了一种改进的真空断路器电寿命在线监测方法，该方法考虑了各相实际的开断过程和燃弧时间，准确性有较大的提高，可以更加真实地反映各相的电磨损情况。
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