Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for calculating instantaneous electric field distribution of transformer under lightning impulse voltage

A technology of lightning impulse voltage and electric field distribution, applied in the direction of testing dielectric strength, design optimization/simulation, etc., can solve the problem that it is difficult to meet the optimal design of transformer windings and overall insulation structure, there is no unified, mature, and the progress of power transformer manufacturing technology Constraints and other issues to achieve the effect of improving solvability, improving efficiency, and reducing design cycle and cost

Inactive Publication Date: 2020-01-17
XI AN JIAOTONG UNIV +1
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the calculation, there is no unified and mature method for the system analysis and calculation of the lightning shock wave process of the power transformer and the electric field under the lightning impulse voltage, and it is difficult to meet the optimal design of the transformer winding and the overall insulation structure by empirical design. There are certain restrictions on the progress of transformer manufacturing technology

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
  • Method for calculating instantaneous electric field distribution of transformer under lightning impulse voltage
  • Method for calculating instantaneous electric field distribution of transformer under lightning impulse voltage
  • Method for calculating instantaneous electric field distribution of transformer under lightning impulse voltage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] like figure 1 As shown, the calculation method of the instantaneous electric field distribution of the transformer under the lightning impulse voltage of this embodiment includes the following steps:

[0045] Step 1): Use 3D CAD software to establish a finite element analysis model of a power transformer. In view of the high symmetry of the transformer windings, in order to reduce the consumption of computing resources and improve the speed of simulation calculations, establish a model such as figure 2 The 2D axisymmetric model is shown. Then determine the material parameters and electrical properties. The transformer in this embodiment is a 110kV dry-type transformer, and determine the relative permittivity of the insulating medium (epoxy resin and air). At the same time, it is also necessary to determine the type of lightning shock wave loaded (standard lightning shock full wave and standard lightning shock chopping wave) and related parameters such as wave front ti...

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

No PUM Login to View More

Abstract

The invention discloses a method for calculating instantaneous electric field distribution of a transformer under lightning impulse voltage. The method comprises the following steps: establishing a finite element analysis model of a power transformer; grouping the transformer windings, and performing simulation calculation on the electric field and the magnetic field of the transformer windings toobtain equivalent capacitance and equivalent inductance distribution parameters of each part of windings; establishing an equivalent circuit model of the complete winding of the transformer in circuit simulation analysis software, and solving the voltage waveform of each part of winding in the whole process that the transformer is subjected to lightning impulse voltage; and reloading the voltagewaveform into the finite element simulation model, and calculating the transient electric field to obtain the instantaneous electric field distribution condition of the transformer in the whole process of receiving the lightning impulse voltage. Complex electromagnetic transient coupling is replaced by field circuit indirect coupling, the instantaneous electric field distribution condition of thetransformer in the whole process of suffering from lightning impulse voltage is calculated, the analysis and calculation efficiency is improved, the design period and cost of the transformer are reduced, the electrical performance is improved, and good practicability and economical efficiency are achieved.

Description

technical field [0001] The invention belongs to the technical field of electric equipment insulation structure design, and in particular relates to a calculation method for transformer instantaneous electric field distribution under lightning impulse voltage. Background technique [0002] The power transformer is an indispensable device in the power system, which plays an important role in the transmission, conversion and distribution of electric energy. During the operation of the power transformer, it not only needs to work under the rated voltage for a long time, but also sometimes bears various overvoltages. According to statistics, among various overvoltages, lightning overvoltage is one of the main causes of power transformer failures and even accidents. The reason is that the winding structure of the power transformer is very complex, and its equivalent circuit is a network composed of many capacitors and inductances, and the lightning overvoltage has the characteris...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G01R31/12
CPCG01R31/12
Inventor 彭宗仁刘丽岚胡睿智陆煜程建伟
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com