基于AD7656开发高压容性设备绝缘介损的信号的采集系统

AD7656 Based Development of Signal Collection System for Insulated Dielectric Loss in High Voltage Capacitive Equipment

为精确测量能反映高压容性设备绝缘状况的介质损耗值,设计了相应的信号采集系统.采用电网频率跟踪技术,将传感器测得的三相末屏电流模拟值经信号调理电路调理及AD620AR放大器放大后,并经AD7656进行模数转换,将模拟信号直接转化为数字信号,避免了信号传输过程中的干扰和衰减问题;并采用参考电源解决了远距离同步采集问题.介绍了基于多通道高分辨率AD7656开发绝缘介损在线监测终端信号采集系统的具体方法,给出了具体的接口实现电路和数据采集的初始化操作过程,经实际应用,系统可靠稳定.

In this paper, a signal collection system is designed to measure the value of dielectric loss tgδ on-line, which reflects the insulation states of high voltage capacitive equipment. The frequency tracking technique of electrified wire netting is applied to transform the analog signals measured by three phase end-electric current into digital signals through AD620AR magnifier and ADC7656, thus signal disturbance and decline are avoided. By applying the reference power, the problem of remote synchro-collection is consequently solved. Also introduced in this paper is the specific method which is developed using on-line monitoring terminal of insulated dielectric loss based on multicenter and high graphics. The detail interface circuit and initialized operation of completed the data collection and operating programs are provided. The test results exhibit the system＇s stability and reliability.