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電容器組分為
幾個步驟，直接安裝在主配電盤中；使用
只有在吸收
中，無功能量的消耗是相當(dāng)有規(guī)律的。
集中式PFC的主要缺點是
PFC裝置下游的安裝尺寸必須考慮
計算負(fù)荷所需的全部無功功率。
3.3保護(hù)斷路器和
電容器組的切換
低壓電容器組保護(hù)和切換用斷路器
應(yīng)：
1、承受連接和連接時產(chǎn)生的瞬態(tài)電流
斷開銀行的連接。特別是瞬時磁場和
電子脫扣器不得因這些峰值電流而跳閘；
2、承受由電壓引起的周期性或性過電流
諧波和容量額定值的公差（+15%）；
3、執(zhí)行大量空載和有載操作，也包括高負(fù)載
頻率
4、與任何外部設(shè)備（接觸器）協(xié)調(diào)。
此外，斷路器的接通和斷開容量必須為
足以滿足裝置的短路電流值。
IEC 60831-1和60931-1標(biāo)準(zhǔn)規(guī)定：
-電容器的有效電流值通常應(yīng)高達(dá)130%
其額定電流Irc（由于可能存在電壓諧波）
網(wǎng)絡(luò)）；
-對于高達(dá)100 kvar的組，電容的容差為10%，容差為5%
對于超過100 kvar的組，允許使用。
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.
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