Dry type power transformer with voltage ratio of 33/22kV voltage level

Abstract

The invention relates to a dry type power transformer with voltage ratio of 33 / 22kV voltage level. The dry type power transformer comprises upper clamping pieces, lower clamping pieces and an iron core which are arranged on a supporting frame, and a low-tension coil and a high-tension coil which are mounted on the iron core in sequence in a jacketing manner from inside to outside; an upper spacer block and a lower spacer block are arranged between the high-tension coil and the low-tension coil as well as between the upper clamping pieces and the lower clamping pieces respectively; a pressing nail penetrating a pressing nail sleeve on the upper clamping piece is pressed against a long circular groove on the upper surface of the upper spacer block through a pressing nail pad; a pair of a low-tension coil positioning rod and a high-tension coil positioning rod for fixing the low-tension coil and the high-tension coil is arranged on the opposite surfaces of the upper spacer blocks and the lower spacer blocks from inside to outside; insulating cylinders are arranged between the high-tension coil and the low-tension coil as well as between the low-tension coil and the iron core; and the upper ends and the lower ends of the two insulating cylinders are respectively inserted into corresponding circular long grooves on the opposite surfaces of the upper spacer blocks and the lower spacer blocks. The dry type power transformer has the advantages of good electric insulating property, high anti-lightning impact property, flame retardance, environmental protection, maintenance-free, security and reliability, and is suitable for a load center of urban electricity supply.

Description

Technical field: [0001] The invention relates to a dry-type power transformer, in particular to a dry-type power transformer with a voltage ratio of 33 / 22kV voltage level. Background technique: [0002] At present, transformers with a voltage ratio of 33 / 22kV in the power system have high requirements on electrical insulation performance, so oil-immersed transformers are mostly used in use, but oil-immersed transformers require regular maintenance and oil quality testing. And it is flammable and explosive, causing pollution to the environment and many other problems, so it cannot be applied in urban load centers. However, with the acceleration of the urbanization process and the continuous increase of urban electricity loads, regional substations of high voltage and large capacity urban networks are getting deeper and deeper into the load centers of urban centers, residential quarters, and large and medium-sized factories and mines. The cable enters the city, the cable ente...

AI Technical Summary

Problems solved by technology

[0002] At present, transformers with a voltage ratio of 33 / 22kV in the power system have high requirements on electrical insulation performance, so oil-immersed transformers are mostly used in use, but oil-immersed transformers require regular maintenance and oil quality testing. And it is flammable and explosive, causing pollution to the environment and many other problems, so it cannot be applied in urban load centers

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