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Suppression device for magnetizing inrush current of transformer

A technology of excitation inrush current suppression device, applied in the field of power system, can solve the problems of threatening the safety of transformer windings, large single-phase ground fault current, and low zero-sequence impedance

Active Publication Date: 2021-05-11
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a suppressing device for transformer excitation inrush current to solve the problems of low zero-sequence impedance and large single-phase ground fault current, which seriously threaten the safety of transformer windings

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  • Suppression device for magnetizing inrush current of transformer

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] It should be understood that the step numbers used herein are only for convenience of description, and are not intended to limit the execution order of the steps.

[0024] It should be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an"...

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Abstract

The invention discloses a suppression device for magnetizing inrush current of a transformer. The suppression device comprises a small reactor, a first air gap, an isolating switch, a first lightning arrester, a second air gap, a second lightning arrester and an isolating switch; the small reactor and the isolating switch are connected in series; the small reactor, the first lightning arrester and the first air gap are connected in parallel and are jointly connected with a neutral point of a high-voltage winding of a three-winding transformer; and the second lightning arrester, the second air gap and the isolating switch are connected in parallel and are jointly connected with a neutral point of a low-voltage winding. According to the invention, the neutral point of the transformer is grounded through the small reactance to suppress the overvoltage, so that the excitation surge current of the transformer and the short-circuit fault current of the line can be reasonably and effectively suppressed, and excessive offset of the voltage of the neutral point cannot be caused.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a suppressing device for transformer excitation inrush current. Background technique [0002] The neutral point of the transformer is related to the operation mode of the power system. According to different grounding conditions, it can be divided into two systems: the neutral point is directly grounded and the neutral point is not directly grounded. In the 220kV system, the direct grounding of the transformer neutral point can reduce the insulation level requirements of the transformer neutral point and reduce the project cost, so it is widely used in the power grid. [0003] Operation experience in recent years shows that there are also some disadvantages in the neutral point direct grounding system. On the one hand: When the no-load transformer is switched on, the excitation inrush current may be too large to cause the protection to trip. In response to this phenomenon...

Claims

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Application Information

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IPC IPC(8): H02H9/00H02H9/04
CPCH02H9/002H02H9/045Y02E40/40
Inventor 宋坤宇王增彬李谦杨贤吕鸿
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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