Composite Insulators Leakage Current Measurement System Based on LabView

Leakage current(LC) is an important parameter of composite insulators in the aging process. Inspecting the change and development of LC during artificial accelerated aging tests of composite insulators can help us to analyze the mechanism of insulators aging. In this paper, a composite insulators leakage current monitoring and analyzing system based on LabView and data acquisition card is designed. The system is capable of real-time monitoring amplitude of LC, cumulative charge, the amount of pulse and displaying LC waveforms. In order to analyze the effects for the insulators aging brought by the power frequency current and pulse current separately, the system separates them from LC. The whole current waveform during specified time can be stored through the timing storage function. The system provides a powerful tool for researching the composite insulators performances. Compared with traditional data acquisition, this system has characters of low cost, high sampling precision, convenient, flexible in use and has friendly human machine interface. The long running experience in artificial accelerated aging tests indicates that the acquisition and analyzing of composite insulators LC are high precise, stable and reliable. The system makes the measurement work of the aging test fulfilled automatically which can reduce the workload and save manpower.