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

A power transformer, 1.330kv technology, applied in the field of transformers, can solve the problems of leakage magnetic flux windings and local overheating of structural parts, and achieve the effect of reducing stray losses, reliable clamping structure and fastening measures, and light weight

Inactive Publication Date: 2013-04-17
BAODING TIANWEI BAOBIAN ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0013] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0014] 330kV class three-phase three-winding OLTC high-impedance power transformer, on the outside of the three-phase five-column core 2, there are low-voltage windings 3, public windings 4, series windings 5 ​​and voltage-regulating windings 6 concentrically installed in sequence, and the low-voltage windings are connected in series Reactor; the on-load voltage regulating device is arranged at the end of the transformer oil tank; the on-load voltage regulating device is composed of three single-phase on-load switches and arranged at the end of the transformer oil tank, and the three single-phase on-load switches share one set of transmission mechanism; A, B, C three phases each adopt a single-phase on-load switch group for voltage regulation, and adopt the voltage regulation method at the end of the series winding; the reactor connected in serie...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F29/04H01F27/30H01F27/40H01F27/36H01F27/28H01F30/02
Inventor 李金辉谢辉刘荣龙腾张小刚兰洪顺
Owner BAODING TIANWEI BAOBIAN ELECTRICAL
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