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4. 继电器时间参数的获取方法
继电器时间参数的检测主要利用电秒表和光线示波器等模拟试验的方法得到，传统检测方法测量速度慢、误差大、测量不准确等。随着计算机技术的发展，越来越多的继电器检测装置应用微处理器，这些检测装置其原理大体相同。文献中提到了一种时间参数检测电路，该电路主要组成部分为单片机，其检测原理为：当继电器触点闭合时，单片机对应输入通道电压为 5V，端口为“1”，当继电器断开时，其对应电压为 0V，I/O端口为“0”。当给继电器加励磁电压时，单片机以足够小的采样周期读取单片机对应的数字I/O端口，经过数据处理，即可计算出相应的时间参数。但是采用此种方法在继电器接直流负载时基本符合，当接交流负载时，由于交流电压是交变的，继电器断开时时单片机端口电压的瞬时值也有可能很小或接近于零。因此，在触点所接回路为交流回路时，利用触点间电压瞬时值的大小来判断触点的闭合与断开状态，误差就会很大，从而得不到准确的数值。文献中提到了一种继电器时间参数的计算机检测方法，它采用自行研制的采集板卡，其主要由单片机及其电路组成。该方法可以检测到继电器动作时间、动作回跳时间、释放时间、释放回跳时间等时间参数。单片机接于线圈驱动电路中控制励磁线圈通电与断电，采集继电器闭合与分断时触点的状态，并计算其时间参数。其检测原理为：当继电器线圈通电时触点经过定的动作时间才能够闭合，因此单片机先采集到数据 0，触点闭合稳定后采集到 1。在此过程中触点会产生弹跳，后才能达到稳定状态，在此期间单片机采集到的数据或为 0 或为 1。设定单片机的采样周期为 0.01ms，由单片机采集到的数据的地址值乘以采样周期，即为所求动作时间。
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1.以计算机作为上位机，A/D 采样板或 DSP 作为下位机的触头参数自动检测系统
采用自行研制的继电器电寿命计算机检测与控制装置在继电器电寿命试验的开始、中间、结尾三个不同的时段对过电压信号进行采集。采用自行研制的A/D采样板或以DSP为核心的高速数据采集卡，对触头接触压降、断开触头间电压、主回路电流等触头电气参数进行采样。控制部分采用数字I/O板通过控制固态继电器来驱动接触器或继电器通断。软件方面采用VB编程，中断处理程序实现数据采样、逻辑控制等功能。文献中的数据处理方面主要针对电网频率、功率因数的计算。通过对采集到的电压信号的分析，利用快速傅里叶变换将时域信号变换为频域信号，将变换的结果分别放在实部与虚部的数组中，出现峰值的位置为电网频率，利用公式计算出电网频率。将采集到的数据进行傅里叶变换，将时域信号变换为频域信号，从而计算出电压和电流的相位，进而求得功率因数。
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//r2amq.com