一种新型超低频正弦波发生器的研制

A new type of very low frequency sinusoidal waveform generator

近年来,超低频试验装置因其轻便性得到了推广。研制了一种新型的超低频正弦波发生器,利用该装置可以进行电力电缆的耐受电压试验。装置主要由双极性充电电路、放电电路、极性转换开关、电阻分压器以及控制系统组成,产生超低频正弦波的关键在于滞环控制技术。在实验室中搭建装置并进行验证,其输出波形的畸变率低于5%,满足IEEE 400.2标准及国标要求,验证了该超低频正弦波发生器的可行性与有效性。

The very low frequency (VLF) testing equipment has been widely used in recent years due to its portability. A new type of VLF sinusoidal waveform generator which can be used for withstand voltage testing of power cables is presented. The equipment consists of a bipolar charging circuit, a discharging circuit, a polarity conversion switch, a resistance voltage divider and the control system, and the key to generate VLF sinusoidal waveform is hysteresis control technology. An experiment platform is built in the laboratory, and the result shows that this generator can generate a sinusoidal waveform at 0.1 Hz whose total harmonic distortion can meet the requirement of IEEE 400.2 standard and national standard, and its feasibility and effectiveness are proed.