Tap switch testing device and control method

A tap switch testing device comprises a circulating cooling system, a circulating cooling and heating system and a tap switch testing stand, the tap switch testing stand comprises a tap switch and an oil drum, and the tap switch is immersed in oil in the oil drum; the circulating cooling and heating system comprises a heater, an oil-water heat exchanger and a power pump, and the tap switch test bed, the power pump, the oil-water heat exchanger and the heater are sequentially connected through pipelines and used for oil way circulation; the circulating cooling system comprises an inner water-cooling circulating device and an outer water-cooling heat dissipation device, the inner water-cooling circulating device is provided with a main circulating pump, and the main circulating pump, the oil-water heat exchanger and the outer water-cooling heat dissipation device are sequentially connected through pipelines and used for cooling medium circulation. The temperature control device has the beneficial effects of hig