Double-flange fully-sealed oil sampling structure for main transformer on-load tap-changer

The utility model relates to a double-flange fully-sealed oil sampling structure for a main transformer on-load tap-changer, which is characterized by comprising an oil sampling device arranged on an oil filtering pipeline of a transformer in series, and the oil sampling device comprises a first flange plate and a second flange plate which are arranged in parallel at an interval, a center pipe is connected between the first flange plate and the second flange plate, counter bores communicated with through holes in the center pipe are formed in the outer end face of the first flange plate and the outer end face of the second flange plate, and sealing rings protruding out of the outer end faces of the flange plates are arranged in the counter bores. The oil sampling device has the advantages that the oil sampling device with one size can be applied to different transformer oil filtering pipelines so as to be matched with fixed flange plates with different specifications, so that the types of processing and manuf