Oil-regulator are formed of  regulating transformers TS (including tanks, stator, rotor cap, transmission control motor M, hand wheel and the control circuit secondary voltage control circuit board components and other components. Motor through fax or hand wheel and the gear coupling to achieve surge rotation, rotation of 180 º, and a tank top limit electrical and mechanical limit, the electrical switch to limit the trip to cut off electrical power, mechanical limit - protection from its bolts to block rotation limit. Rotor and stator winding are fixed on the end of fixed-Add, There is 10 # transformer oil in the fuel tank, when the heat load, it cooling by immersion and dispelled by tube. It has the protection of wrong/absence of phase, overpressure, over current; main circuit non-contact, non-mechanical wear, non-sparks, non-interference, low failure rate; and strong impact-resistant, very high instantaneous overload capacity, long service life, without maintenance and many advantages.