基于虚拟仪器的电力变压器局部放电在线监测系统

On-line Detecting System for Partial Discharge in Power Transformer Based on Virtual Instrument

介绍了一种虚拟仪器技术在电力变压器局部放电在线监测系统中的应用。分析了其硬件组成及各部分的功能,并利用虚拟仪器软件的控制功能及强大的数据处理功能,实现了对外围硬件电路和数据采集方式的有效控制,并对采集到的信号施行了数字滤波和极性鉴别等抗干扰措施,保证了测量的准确性。最后对现场经过抗干扰处理后的数据进行了统计分析,作出了能够反映局部放电特征的二、三维谱图和反映放电水平发展的趋势图。

The application of virtual instrument technology, which is used in the on-line partial discharge detecting system for power transformer is introduced in this article. The hardware structure and its function are analyzed. With the control function and the powerful digital processing function, the periphery hardware circuit and the data acquisition mode can be controlled efficiently, and the methods such as digital filter and polarity identification have been applied to signals, which can ensure the measurement accuracy. The 3D and 2D graph representing the characters of partial discharge and the tendency graph representing the increasing of the level of partial discharge have also been made by the statistics analyzing method.