在低压无功补偿系统中，电容器作为无功补偿柜内的最核心的器件，寿命除了受使用环境影响外,其谐波电流、合闸涌流及长期过电压的大小影也非常重要，严重时直接造成电容器损坏，因此在电容器前串联一定比例的电抗器，用以抑制和吸收部分谐波，确保补偿回路的安全性和稳定性是目前最常见的方法。

WEL系列低压滤波电抗器与电容器电联后，可抑制造波放大，并且滤除一定比例的谐波，经过精确搭配，与电容器串联组成无源滤波器，可以精确滤除某次谐波，同时抑制投入电容器时的涌流，保护电容器及其他元器件。

In the low-voltage reactive power compensation system,the capacitor as the most core device in the reactive powercompensation cabinet, in addition to the impact of the useenvironment, the harmonic current, closing inrush current and long-term overvoltage is also very important, serious direct damage tothe capacitor, so a certain proporlion of reactors in series before thecapacitor to suppress and absorb part of the harmonic. Ensuring thesafety and stability of the compensation loop is the most common method at present.

WEL series low-voltage filter reactor and capacitor in series. caninhibit harmonic amplification, and filter out a certain proportionof harmonics, through accurate collocation, and capacitor inseries to form a passive filter, can accurately filter out a harmonic.while suppressing the inrush current into the capacitor, to protectcapacitors and other components.