Comprehensive diagnosis method of oil-immersed transformer based on fault tree
An oil-immersed transformer, comprehensive diagnosis technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., to ensure the effect of safe and stable operation
Active Publication Date: 2014-06-11
STATE GRID ELECTRIC POWER RES INST +2
View PDF3 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to overcome the shortcomings of the traditional single diagnostic method of oil chromatography, use multiple diagnostic methods to comprehensively diagnose and improve the accuracy of fault diagnosis, and introduce top layer oil temperature, partial discharge, micro water, iron core ground current and winding optical fiber temperature measurement at the same time Evaluate the health status of the transformer by monitoring the amount of monitoring to determine the scope of the fault, and dig out the relevant fault rules to provide a planning basis for condition-based maintenance
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment
[0086] (1) First, the monitoring device of the important parts of the transformer, such as dissolved gas in oil, partial discharge, micro water, iron core ground current, top layer oil temperature, and winding optical fiber temperature measurement monitoring, sends the obtained state quantity information to the state interface through the bus. Enter the gateway machine, and parse and store it in the corresponding database table.
[0087] (2) Using samples to improve the three-ratio method, IEC60599 method, improved electrical research method, no coding method and David's triangle method to make statistics on the diagnostic accuracy of various fault diagnosis methods to obtain an initial diagnosis
[0088] The correct rate table of the judgment method. As shown in Table 5:
[0089] Table 5 The correct rate table of diagnostic methods
[0090]
Fault 1
failure 2
failure 3
Fault 4
Fault 5
Fault 6
Fault 7
Fault 8
Diagnostic method 1...
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
Login to View More Abstract
The invention discloses a comprehensive diagnosis method of an oil-immersed transformer based on a fault tree, which includes steps: (1) collecting correlated condition characteristic parameter values of gas dissolved in oil, moisture in oil, local discharge, iron core grounding current, top oil temperature and winding optical fiber temperature measurement of the transformer in real time, (2) normalizing by aid of diagnosed fault types of gas dissolved in oil, (3) counting fault diagnose accuracy of all diagnose methods, (4) obtaining state quantity of measured gas dissolved in oil for respective diagnose, (5) obtaining a fault confidence digit group, and (6) integrating to obtain a fault diagnose result of the transformer. The comprehensive diagnosis method combines advantages of various oil chromatographic diagnose methods, overcomes defects of a single diagnose method, adopts gas dissolved in oil as a diagnose core, is supplemented by fault tree diagnose, masters operation health conditions of the transformer macroscopically, can achieve fault positioning of devices, and has important practical meaning for finding potential hidden fault danger of devices and ensuring safe and stable operation of an electrical power system.
Description
technical field [0001] The invention relates to the technical field of fault diagnosis of substation equipment, in particular to a comprehensive diagnosis method for an oil-immersed transformer based on a fault tree. Background technique [0002] The power transformer is the hub of the grid to transmit electric energy and the main equipment of the grid operation. The reliability of its operation is a necessary condition for the safety and stability of the power system. The capacity and voltage level have also been increased accordingly, and higher requirements have been put forward for the reliability of the transformer. Therefore, it is of great practical significance to find potential hidden troubles early through online monitoring and fault diagnosis of transformers. [0003] Relatively mature transformer online monitoring technologies have been formed at home and abroad, such as partial discharge, oil chromatographic analysis, core ground current and top oil temperature...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 张声圳林峰李莉李盛盛
Owner STATE GRID ELECTRIC POWER RES INST