The invention discloses a prefabricated cabin type high-
voltage reactive compensation device and a reactive supplementation method. A prefabricated cabin is provided with a ventilation device, a lighting device, an air-conditioner, an image monitoring device and a fire warning and
firefighting device, wherein a distribution cabinet is internally provided with a standard high-
voltage primary interface and a power source interface, and supplies power to the prefabricated cabin; a wire concentration cabinet is connected to the distribution cabinet, the ventilation device, the lighting device, the air-conditioner, the image monitoring device and the fire warning and
firefighting device to improve the safety of the reactive compensation device and solve the problem of safety
hazard as the incoming wires of the primary circuit of the existing box type high-
voltage reactive compensation device are fussy; the wire concentration cabinet is internally provided with a standard secondary interface and an optical interface, and realizes communication with a
station control layer by acquiring analogue
signal amount inside the distribution cabinet and converting the analogue
signal amount into an optical
signal and an optical signal, so that the problems of fussy interfaces of the
secondary circuit interface and existence of signal attenuation due to the adoption of the analogue signal long-distance transmission are solved; a console is arranged, so that a man-
machine interaction function is achieved, the existing state of the device is known comprehensively, and convenience is brought to daily control and maintenance.