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
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 prob

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Suppression device for magnetizing inrush current of transformer
  • Suppression device for magnetizing inrush current of transformer

Examples

Experimental program
Comparison scheme
Effect test

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"...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Heightaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap