Method for diagnosing severity degree of transformer fault

A technology for transformer faults and severity, applied in instruments, measuring electrical variables, measuring devices, etc., can solve problems such as misjudgment, transformer damage, and serious faults, to ensure safe operation, ensure safe operation, and prevent damage events. Effect

Active Publication Date: 2012-09-19
STATE GRID HEBEI ELECTRIC POWER RES INST +2
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has limitations. In some cases, the gas production rate calculated based on the transformer oil chromatographic detection data is very large, but the actual gas production rate is in a decreasing trend. In this case, the transformer may not exist. Internal faults, only based on the absolute value of the gas production rate to judge the fault of the transformer will lead to misjudgment
On the contrary, the absolute...

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 diagnosing severity degree of transformer fault
  • Method for diagnosing severity degree of transformer fault
  • Method for diagnosing severity degree of transformer fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings. The scope of protection claimed by the present invention is not limited to the scope indicated by the examples.

[0014] The diagnosis process of transformer fault severity in the present invention is as follows: figure 1 As shown, the gas content in transformer oil is analyzed by chromatography, and the gas output of transformer oil is analyzed by chromatography for a period of time. The gases in transformer oil are carbon monoxide, carbon dioxide, hydrogen, methane, ethane, ethylene and acetylene. Table 1 is the statistical table (excel table) of transformer oil chromatographic analysis data of No. 2 220KV transformer of a substation in Handan, Hebei in 1998. The transformer oil was sampled for chromatographic analysis to measure the dissolved gas content in the transformer oil, and the analyzed data were included in Table 1. The total hydrocarbon content, the absolut...

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 relates to a method for diagnosing the severity degree of a transformer fault. The method comprises analyzing the gas content in transformer oil by using chromatography; accumulating the dissolved gas content in the transformer oil tested over a certain period; calculating the nitrogen or total hydrocarbon absolute aerogenesis rate and the change rate of the aerogenesis rate; and drawing a diagram, in which the absolute aerogenesis rate is the vertical coordinate and the time is the horizontal coordinate; and judging whether a fault occurs to the interior of a transformer according to the absolute aerogenesis rate and the change rate of the aerogenesis rate. According to the method, the development and the severity degree of the fault in the interior of the transformer are judged by calculating the absolute aerogenesis rate and the change rate of the aerogenesis rate in a mode of diagram; a corresponding transformer monitoring and maintenance strategy is made; the accurate master of the operation and the interior fault situation of the transformer is achieved; the security operation of the transformer in a power grid is guaranteed; and the accident that the transformer is damaged is prevented.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis and analysis of electrical equipment, and relates to a diagnostic method for the severity of transformer faults, in particular to a diagnostic method for judging the severity of faults through chromatographic analysis of changes in dissolved gas in transformer oil. Background technique [0002] The analysis of dissolved gas in transformer oil is the most effective method for domestic and foreign power systems to monitor the operation of transformers under live conditions. At present, the power industry generally uses chromatography to regularly detect transformer oil to judge whether there is a fault in the transformer. After years of development, there has been a set of methods for judging the type of faults based on oil chromatographic analysis results. The method uses the ratio of various chromatographic data to determine the specific fault type of the transformer, and uses the absolute...

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): G01R31/00
Inventor 杜黎明张利燕刘克成陈志勇张若飞
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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