IC660BBD022
IC660BBD022
IC660BBD022
IC660BBD022
对相位差的测量要求达到整个-180—+180度范围。有一些控制器具有电流互感器接反的自动识别功能，这种控制器以有功必须为正值来判断互感器的正反，相当于-90—+90度范围，这就可能以下的问题：
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（1）当负荷处于发电状态时会出现检测错误。
（2）当负荷为纯电感或纯电容时，由于有功电流约等于零，可能会将电感误判断为电容或者将电容误判断为电感。而负荷为纯电容的状态经常会出现，例如负荷为单一大负荷而负荷停机时，无功补偿电容器尚在运行，于是变压器二次电流就变为纯电容电流，如果将这个电流误判为电感电流，控制器就会继续投入电容器，直至将所有的电容器全部投入运行，造成严重的过补偿现象。
2、显示器的选择
最常用的显示器件就是LED数码管，LED数码管价格低廉、可靠性高。使用多位组合的LED数码管，这样可以大量减少线路板连线并且减少焊接安装工作量。
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