Using shunt capacitors for local reactive power compensation is the preferentially adopted reactive power compensation mode in power system.Based on a sufficient insulation distance and convenience in the ventilation and radiation

most of the products are installed and operated outdoor and their operation stability is easily affected by many factors of the surrounding environment.In this paper

the fault of an outdoor 35 kV capacitor bank is investigated and analyzed

the fault is located. Moreover

the fault development process is analyzed through the on-site inspection of the equipment

operation situation and testing of internal equipment in the capacitor bank.The direct and indirect causes for the faults are analyzed and summarized

and some suggestions on preventing such similar faults are proposed

for the reference to the readers.