The OQ3000CT active transformer whole process intelligent health management system, which is the world's first, can simultaneously monitor the acid value, dielectric constant, conductivity, pollution degree, moisture, water activity, breakdown voltage, dielectric loss coefficient and other important parameters in insulating oil in real time. The system is widely used in on-line condition monitoring of oil products and equipment used in transformer main transformer, on load tap changer, copper, aluminum and other metal calendering processes.