Method, system and equipment for detecting running state of oil-immersed current transformer

The invention relates to the technical field of electric power measurement monitoring, and discloses a method, a system and equipment for detecting the running state of an oil-immersed current transformer. The method comprises the following steps: collecting the actual measurement data of the height of an expander of the oil-immersed current transformer and the actual measurement data of the temperature of the top layer of insulating oil; according to the linear relation between the height of the expander and the temperature of the top layer of the insulating oil, whether the linear relation between the actually measured data of the height of the expander and the actually measured data of the temperature of the top layer of the insulating oil changes is judged; if yes, whether external influence factors exist or not is judged according to the linear relation between the actual measurement data of the expander height of the other three-phase current transformers and the actual measurement data of the temperatu