Method for evaluating insulation aging state of stator bar based on space charge method

A space charge and stator bar technology, applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of single insulation information, cumulative insulation damage, and difficulty in accurately evaluating the insulation status of generators, and achieve information Rich, accuracy-enhancing effects

Active Publication Date: 2019-02-22
HARBIN ELECTRIC MASCH CO LTD
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the following disadvantages: the test uses AC high voltage, which will cause cumulative damage to the insulation; the test uses power frequency or DC voltage, and the insulati

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 evaluating insulation aging state of stator bar based on space charge method
  • Method for evaluating insulation aging state of stator bar based on space charge method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] A space charge method to evaluate the insulation aging status of stator bars is as follows: a flame-retardant board is used as a comprehensive aging closed room to maintain the heat generated during the electrical aging test of the stator bars; a simulated stator core 1 is made, and the bars are placed in the simulation In the stator core, a comprehensive aging test is carried out; a horizontal vibration platform 2 is made. During the comprehensive aging test, the simulated stator core is placed on the vibration platform, and the platform vibrates at a frequency doubled with an amplitude of 0.28mm; refer to the wire rod 3 to apply 1.6 respectively U N , 2.0U N , 2.5U N , 3.0U N Voltage, U N It is the rated voltage of the motor, in kV, a comprehensive aging test is carried out until the insulation breakdown of the bar, and the relationship between the voltage and the electrical aging time is used to map the service life of the bar; the test bar 4 is applied with 1.0U N The ...

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
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for evaluating the insulation aging state of a stator bar based on a space charge method. When a simulated unit works, a stator bar is affected by electric aging, heat aging and mechanical aging. A simulated iron core (1) and a vibration platform (2) form an integrated aging testing device. In an electric aging test, the bar is placed in the simulated iron core tocarry out horizontal vibration, wherein the aging temperature is between 80 DEG C and 90 DEG C. A reference bar (3) carries out electric aging testing at voltages of 1.6UN, 2.0UN, 2.5UN, and 3.0UN, wherein the UN expresses the rated voltage of the wire rod; and on the basis of a relationship map between the voltage and the breakdown time, the service life of the reference bar is calculated. A testing bar (4) carries out electric aging testing at the voltage of 1.0UN; and space charge testing and breakdown testing are carried out at 0h, 500h, 1000h, 1500h, 2000h, 2500h. According to a functionrelationship of total space charge amounts, space charge threshold field strengths and residual breakdown voltages of different aging time, the residual service life of the test bar is evaluated.

Description

Technical field: [0001] The invention relates to a method for detecting and evaluating the insulation aging state of a stator bar by using a space charge method. Background technique: [0002] Generators are one of the most important electrical equipment in power plants, and their operating status directly determines the safe and stable operation of the power grid. Generator stator bars suffer from aging degradation due to the combined effects of thermal, electrical, mechanical and environmental factors for a long time. Studies have shown that the insulation state of the stator coil directly determines the operating state of the generator. Therefore, accurate evaluation of the insulation state of the stator coil is of great significance for formulating a reasonable maintenance plan and improving the operating reliability of the generator. At present, the detection methods of generator stator coil insulation mainly include conventional test methods such as insulation resista...

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): G01R31/12G01R31/00
CPCG01R31/003G01R31/1209G01R31/1263
Inventor 付强
Owner HARBIN ELECTRIC MASCH CO LTD
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