Vacuum oil filtering method of natural ester insulating oil for transformer

The invention provides a vacuum oil filtering method of natural ester insulating oil for a transformer, belonging to the technical field of transformer manufacturing processes. The method comprises the following steps that: a first container and a second container are arranged, and realizes mutual communication through gas pipes; an oil filtering mechanism for heating and filtering the natural ester insulating oil is arranged; a nitrogen mechanism for filling nitrogen into the gas pipes and discharging nitrogen is arranged; the pressure of nitrogen in the first container and the second container is kept stable; and the oil filtering mechanism and the nitrogen mechanism are started so as to allow the natural ester insulating oil in the first container or the second container to flow to theoil filtering mechanism and the temperature of the natural ester insulating oil to meet oil filtering requirements. The vacuum oil filtering method of the natural ester insulating oil for the transformer, provided by the inve