GWB series of column-pressure automatic reactive compensation devices (hereinafter referred to as unit) and 6KV applicable 10KV distribution lines, mounted on overhead lines as improve power factor, reduce line losses, save energy, improve voltage quality, can also be used for smaller bus terminal substation 1 0KV reactive power compensation, high voltage motors local compensation. The device consists of drop-out fuses, voltage transformers, capacitor switching voltage vacuum contactors special (high voltage vacuum circuit breaker or sulfur hexafluoride load switch), current transformers, zinc oxide surge arresters, high voltage shunt capacitors, high voltage capacitors automatic compensation fixtures and cabinet and other components. The device uses an integrated structure (GWBJ, GWBZ), fully equipped, compact, easy to install, easy to maintain, stable quality, long life