330kv-level three-phase three-winding high-impedance power auto-transformer with function of on-load voltage regulation

Abstract

The invention relates to a 330kV-level three-phase three-winding high-impedance power auto-transformer with the function of on-load voltage regulation and belongs to the technical field of transformers. According to the technical scheme, a low-voltage winding (3), a common winding (4), a series winding (5) and a regulating winding (6) are sequentially and concentrically sleeved outside a three-phase five-pole core (2), and the low-voltage winding is serially connected with an electric reactor. An on-load tap changer is disposed at the end of a transformer oil tank. The electric reactor serially connected with the low-voltage winding is in a three-phase three-pole structure. Rectangular magnetic shields formed by stacked steel strips are disposed at upper and lower ends of a reactor winding (7), and the reactor winding is compressed with tie bolts made of low magnetism steel. The reactor winding is integrally connected with a core of the transformer through a clamp. The 330kV-level three-phase three-winding high-impedance power auto-transformer with the function of on-load voltage regulation has the advantages that short-circuit impedance voltage between high and low tension windings as well as between medium and low tension windings are achieved in such manner that the low-voltage winding is serially connected with the electric reactor, the transformer is small in size, light in weight, low in loss and the like, stray loss is reduced, and local overheating is avoided.

Description

technical field [0001] The invention relates to a 330kV class three-phase three-winding on-load voltage-regulating self-coupling high-impedance power transformer, which belongs to the technical field of transformers. Background technique [0002] At present, the use of high-impedance transformers can effectively reduce the short-circuit current of the system and improve the reliability of the power grid. Compared with ordinary power transformers with the same capacity and voltage level, autotransformers have the characteristics of small size, light weight, and low loss, and are widely used. in ultra-high voltage power systems. At present, the realization method of high-impedance transformer is generally to improve the transformer impedance by adjusting the core diameter, winding parameters or the arrangement sequence of the winding, and taking measures such as splitting the winding when necessary. The key to improving the impedance of transformers with conventional structur...

AI Technical Summary

Problems solved by technology

For large transformers, the prominent problem caused by the increase of leakage flux is localized overheating in windings and structural parts

Images