On-load tap-changer single-resistor transition circuit and voltage regulating method

A technology of on-load tapping and single resistance, which is applied in the direction of circuits, air switch components, transformers, etc., can solve the problem of unbalanced breaking tasks of auxiliary switching elements and main on-off switching elements, and prevent the load from being unable to be broken current, the effect of reducing switching loss

Pending Publication Date: 2021-12-28
XI AN JIAOTONG UNIV
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  • Claims
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Problems solved by technology

In the actual UHV DC transmission project, the load current flowing through the on-load tap changer of the converter transformer is about 500-600A, and the inter-stage circulating current flowing through the transition resistance during the switching process is about 900-1000A. The breaking circulating current is significantly greater than the load current breaking the main on-off switching element, resulting in unbalanced breaking tasks between the auxiliary switching element and the main on-off switching element

Method used

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  • On-load tap-changer single-resistor transition circuit and voltage regulating method
  • On-load tap-changer single-resistor transition circuit and voltage regulating method
  • On-load tap-changer single-resistor transition circuit and voltage regulating method

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Embodiment Construction

[0040] In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041]It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate c...

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Abstract

The invention belongs to the technical field of on-load tap-changers, and discloses an on-load tap-changer single-resistor transition circuit and a voltage regulation method, and the on-load tap-changer single-resistor transition circuit comprises a first main through-flow switch, a second main through-flow switch, a first switch element, a second switch element, a third switch element, a fourth switch element, a change-over switch and a transition resistor. The first switch element and the fourth switch element are used as load current breaking elements, the second switch element and the third switch element are used as circulating current on-off elements, load current is broken by turns through the two load current on-off elements, interstage circulating current in the on-load switching process is broken by turns through the two circulating current on-off elements, the switching program is symmetrical, the working loss degrees of the two circulating current on-off elements are consistent, so that the switching loss of the circulating current on-off elements is reduced, and the electrical life of the on-load tap-changer is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of an on-load tap changer, and relates to an on-load tap changer single-resistance transition circuit and a voltage regulation method. Background technique [0002] The on-load tap-changer is a key component inside the power transformer. It can operate under the transformer excitation or load state. The effective turns ratio can be changed by changing a number of taps drawn from the connected transformer winding, so as to realize the adjustment without interrupting the load current. The output voltage. The on-load tap-changer has a wide range of applications, especially in the converter transformer of the UHV DC transmission project to ensure the rated firing angle of the converter during normal operation. Most of the on-load tap-changers equipped with early power transformers adopted the principle of high-speed resistance switching, relying on copper-tungsten arc contacts for load switching. This type of ...

Claims

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Application Information

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IPC IPC(8): H01F29/04H01H31/02H01H31/04
CPCH01F29/04H01H31/02H01H31/04
Inventor 闫晨光丁凯刘张衡徐雅李盛涛
Owner XI AN JIAOTONG UNIV
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