电容器组分为
几个步骤，直接安装在主配电盘中；使用
只有在吸收
中，无功能量的消耗是相当有规律的。
集中式PFC的主要缺点是
PFC装置下游的安装尺寸必须考虑
计算负荷所需的全部无功功率。
3.3保护断路器和
电容器组的切换
低压电容器组保护和切换用断路器
应：
1、承受连接和连接时产生的瞬态电流
断开银行的连接。特别是瞬时磁场和
电子脱扣器不得因这些峰值电流而跳闸；
2、承受由电压引起的周期性或性过电流
谐波和容量额定值的公差（+15%）；
3、执行大量空载和有载操作，也包括高负载
频率
4、与任何外部设备（接触器）协调。
此外，断路器的接通和断开容量必须为
足以满足装置的短路电流值。
IEC 60831-1和60931-1标准规定：
-电容器的有效电流值通常应高达130%
其额定电流Irc（由于可能存在电压谐波）
网络）；
-对于高达100 kvar的组，电容的容差为10%，容差为5%
对于超过100 kvar的组，允许使用。

automatic units with capacitor banks divided into several steps, directly installed in the main distribution switchboards; the use of a permanently connected capacitor bank is only possible if the absorption of reactive energy is fairly regular throughout the day. The main disadvantage of centralized PFC is that the distribution lines of the installation, downstream of the PFC device, must be dimensioned taking into account the full reactive power required by the loads. 3.3 Circuit-breakers for the protection and switching of capacitor banks The circuit-breakers for the protection and switching of capacitor banks in LV shall: 1. withstand the transient currents which occur when connecting and disconnecting the banks. In particular, the instantaneous magnetic and electronic releases shall not trip due to these peak currents; 2. withstand the periodic or permanent overcurrents due to the voltage harmonics and to the tolerance (+15%) of the rated value of capacity; 3. perform a high number of no-load and on-load operations, also with high frequency; 4. be coordinated with any external device (contactors). Furthermore, the making and breaking capacity of the circuit-breaker must be adequate to the short- circuit current values of the installation. Standards IEC 60831-1 and 60931-1 state that: - the capacitors shall normally function with an effective current value up to 130% of their rated current Irc (due to the possible presence of voltage harmonics in the network); - a tolerance of 10% on the capacitance for banks up to 100 kvar and of 5% for banks exceeding 100 kvar is admited.