HMT-III600-Y on-load tap-changer is a combined multistage coarse voltage regulating tap-changer, which is composed of a switching switch and a tap-selector, wherein the tap-selector is composed of two coarse selector cages and a fine selector cage. Among them, the characteristics of high voltage level, wide voltage regulation range and large capacity are widely used in special transformers.

HMT-III600-Y on-load tap-changer is suitable for rated voltage 35 ~ 220kV, maximum rated current three-phase 600A, single-phase 1200A, rated frequency 50 ~ 60Hz three-phase Y connection neutral point voltage regulation. The single oil-immersed transformer with arbitrary connection voltage regulation can achieve the purpose of voltage regulation by changing the tap connection position of the coil under the load state.