Method for testing transient frequency response of direct-current voltage transformer

The invention relates to the technical field of operation and maintenance of a direct-current power transmission system, in particular to a transient frequency response test method for a direct-current voltage transformer. A testing system composed of an upper computer, a testing host, a direct-current voltage generator and a voltage power amplifier is constructed. Building a transient step response test loop of the direct current voltage divider; carrying out a transient frequency response test; sending a small voltage control signal; synchronously collecting a standard and a test object; starting a break variable; recording wave and recording wave recording time; aC component extraction; and testing frequency response. According to the design of the invention, the test precision is not affected by the step response process of the arbitrary waveform large voltage generator; interpolation calculation can be avoided, and the integrity of original signals is ensured; frequency tracking is performed by using a p