【摘要】 基于PXI总线,通过NI PXI-5112数据采集卡,利用其提供的底层驱动使用C语言进行二次开发,实现了对地铁牵引供电系统发生故障时产生的行波信号的灵活有效地采集与存储,大大增加了连续数据采集的时间;同时,采用在判断触发前增加预处理程序,即在判断是否满足触发条件前,先将数据进行滤波,然后再进行判断,以及门限阈值和变化率相结合的触发方式,减少了由干扰造成的误触发和增强了触发的有效性和可靠性。更多还原

【Abstract】 The traveling wave recording device is developed based on PXI bus using NI PXI-5112 data acquisition card and C programming language which can acquire and storage the traveling wave flexibly and effectively when the traction power supply system in subway fau-lts.The time of continuous data acquisition is greatly increased.Adopting the way of adding filter pretreatment before judging triggering qualification and the triggering mode considering threshold and increment,which decreased the triggering mistakes of disturbing caused and increased the validity and reliability of triggering.更多还原