基于信号注入法的快速消弧线圈接地技术

Grounding through High Speed Arc Suppression Coil Technology Based on Signal Injection

由于谐振接地技术中对地电容测量困难 ,提出信号注入法的解决方法 ,在消弧线圈设置的中性点电压互感器 (TV)的二次侧注入 2 5Hz的电流 ,在另一TV开口三角处测量该频率的电压 ,消弧线圈采用改进后的磁阀式电抗器。据此研制了以单片机 80C196KC为控制器核心的自动跟踪消弧装置。现场试验结果证明该装置结构简单、调节速度快、谐波危害小、补偿准确度高、无机械动作因而可靠性高。

It is difficult to measure system capacitance to earth in resonance neutral earthing technology. To this common problem a method of signal injection is taken to measure capacitance to earth accurately. The neutral-point TV is as signal injection TV, injecting a 25 Hz current signal from the secondary and measuring the 25 Hz voltage at another TV. The arc suppression coil is made by improved magnetic-valve reactor. And the control system design based on microprocessor 80C196KC is accomplished. It is proved through the test that the automatic tracing, resonance compensation and grounding device has many features such as simple structure; quick-response; high compensation precision; less harmonic content and reliability without mechanical action.