罗克韦尔产品1784-PCM2

1784-PCM2

1. 接入滤波电抗器

为了避免系统谐波对电容器的危害以及有效避免高次谐波出现 谐振 ，一般都会建议在无功补偿电容器前端串联滤波电抗器。

但是需要了解的是， 一旦电抗器接入，就会造成补偿电容器组端电压升高 ，使电容出现暂时过电压的情况。

2. 三相电路参数不平衡

大多无功补偿电容器组是以 多个单台电容器为一个单元 ，后将整个单元的电容以并联串联的方式接入电网。

但由于各个电容器的 容值存在差异 ，可能会引发 三相电路参数不平衡 、各 电容器单元所承受的电压不一致 ，继而会造成电容器组出现暂时过电压的情况。

此外，当电容器组使用的是中性点不接地的星形接线方式时，相间电容的误差也会引发三相不平衡电压的出现。

3. 母线上的电压波动

无功补偿电容器本身由于发出无功功率，在投入电网后就会使 投入位置的母线电压升高，造成电压波动， 继而也会反过来影响电容使其出现暂时过电压。

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