The utility model relates to an automatic control device for reactive power compensation in an AC power supply system. The instrument adopts a new detection circuit, which can reflect the change of reactive power of the line quickly. It can not only change the direction of reactive power, but also reflect the magnitude of its change. When the line current is non sinusoidal, the instrument can accurately detect the reactive power variation degree; when the reliability sensitivity of the line current waveform distortion or any instrument always has higher and higher. The detecting circuit of the instrument can work reliably without being adjusted.
【技术实现步骤摘要】
【技术保护点】
一种由无功量检测电路，信号处理电路和稳压电源以及控制电路组成的无功功率补偿自动控制仪器，其检测电路中的晶体管Ｔ↓〔１〕的发射极和集电极经限流电阻Ｒ↓〔１〕与电流互感器二次侧相串联，Ｔ↓〔１〕管的基极和Ｔ↓〔２〕管的基极相连，Ｔ↓〔２〕管的集电极接到一个独立稳压电源的正极，发射极接地；这个独立稳压电源的负极由两个二极管分别和电容器Ｃ↓〔１〕、Ｃ↓〔２〕相连，再经Ｔ↓〔５〕、Ｔ↓〔６〕接地，构成向两个电容器Ｃ↓〔１〕、Ｃ↓〔２〕充电的回路，晶体管Ｔ↓〔５〕、Ｔ↓〔６〕的基极接有控制电压Ｕ↓〔Ｋ〕，控制其导通和截止，将一个与线路电流成比例的电流半波信号在Ｔ↓〔５〕、Ｔ↓〔６〕控制...
【技术特征摘要】
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。