What equipment is used to perform dielectric strength tests on transformer oil?

Dielectric strength is commonly measured using a BDV test set with standardized electrodes and a controlled voltage ramp until breakdown occurs. Lab grade units control electrode gap, rise rate, sample stirring, and temperature more precisely, while field kits provide quick screening. Supporting equipment may include sample containers, cleaning tools for electrodes, and moisture measurement instruments, because water strongly affects BDV. For comprehensive assessment, dielectric loss factor and resistivity instruments are also used alongside BDV testing.