The failure of AC/DC filter in operation will directly affect the energy availability of DC power transmission project

and the capacitor of AC/DC filter is the equipment prone to fault.For improving energy availability of DC power transmission

the special maintenance measures to the capacitor for DC transmission project is proposed

the interval

items and standards of the special maintenance are introduced.It is proved through comparing the fault rate of filter capacitor of four converter station before and after special maintenance that the measure can effectively reduce the fault rate of filter capacitor during operation.And typical faults of capacitor found in special maintenance period and treatment solution are introduced.