Capacitive voltage transformer（CVT） is a kind of electrical equipment

consisting of capacitive voltage divider and electromagnetic unit and having unique structure

and its damping circuit has particular effect in inhibiting ferromagnetic resonance.During operation period at site

correesponding technical supervision on the damping cirucit can not be done due to lack of corresponding pretesting method of the damping circuit

thus leading emergency repair due to frequent fault of the damping circuit.In this paper

a kind of method which is suitable to pretesting damping circuit at site is proposed through finding

analysis and treatment process of the damping circuit of one 35 kV CVT and corresponding suggestion to the site operation and maintenance staffs to find out the fault of CVT as early as possible is given.