The Research on High Voltage Test Technology of ± 800kV High-end valve side bushing in Kunliulong Flexible HVDC Project

Power frequency withstand voltage band partial discharge test, lightning impulse test, partial discharge interference investigation, and impulse waveform modulation of the ± 800kV high-end valve side bushing of Kunliulong flexible DC transmission project are described in detail in this article. In the investigation of partial discharge interference, interference sources such as high-voltage end metal foreigh body dischare, oil bubble discharge, and suspended metal dischare were successfully found. And the characteristics of bubble discharge and metal suspension discharge were analyzed. In the impulse waveform modulation, the copper foil is used as the connecting wire and the wiring method is changed to solve the problem of difficulty in wave modulation caused by the “too large” of the bushing capacitance and the long test loop.