Primary through-flow pressurization test device for transformer and bushing current transformer

The utility model provides a one-time through-flow voltage test device for a transformer and a bushing current transformer. The one-time through-flow voltage test device comprises a power supply module, a rectification module, a DC voltage reduction module, a power amplification unit, an ARM master control module, a memory, a D/A conversion module, a filtering module, an isolation driving module, an LCD display screen, a CPLD auxiliary control module and an encoder. The power supply module, the rectification module, the DC step-down module and the power amplification unit are connected in sequence. The direct current voltage reduction module, the memory, the D/A conversion module and the CPLD auxiliary control module are all connected with the ARM main control module; the filtering module is connected with the D/A conversion module; the filtering module, the CPLD auxiliary control module and the power amplification unit are respectively connected with the isolation driving module; the output end of the power