Generator rotor winding temperature online monitoring method

A technology for generator rotors and rotor windings, applied to thermometers, thermometers using directly heat-sensitive electric/magnetic elements, measuring devices, etc., can solve the problems of generator dust, oil, water mist, complex tests, and short response times Slow down and other problems, to achieve the effect of improving monitoring work efficiency, accurate measurement accuracy, and eliminating voltage drop

Inactive Publication Date: 2014-10-15
贵阳新光电气有限公司
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first type is to pre-embed the temperature measuring element on the rotor winding, and measure the temperature of the rotor winding through a slip ring or a wireless transmission-reception method. The measurement accuracy is high, but because some parts rotate with the rotor, it is difficult to realize
The second type is to use infrared non-contact temperature measurement, but the infrared probe lens is easily affected by dust, oil, and water mist inside the generator, the effect is poor, the response time is also slow, and the application is less
This method is even more flawed: even if the influence of the temperature of the external circuit and carbon brush

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
  • Generator rotor winding temperature online monitoring method
  • Generator rotor winding temperature online monitoring method
  • Generator rotor winding temperature online monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Embodiment 1, according to the generator excitation system parameter table provided by the generator manufacturer, a certain temperature T can be directly obtained C The corresponding rotor winding resistance value R C , And then according to the definition of the resistance-temperature coefficient α of the rotor winding copper bar material, the formula T can be obtained L =(R L -R C ) / (α×R 0 )+T C , So as to calculate the real-time temperature T of the rotor winding 2 L . Among them, α is a constant 0.00393, R 0 Is the temperature T provided by the manufacturer C Corresponding rotor winding resistance R C Converted to the resistance value of the rotor winding at 0℃, R 0 =R C / (1+α×T C ).

Example Embodiment

[0033] Embodiment 2 is based on the definition of the resistance-temperature coefficient α of the rotor winding copper bar material and the resistance-temperature curve of the rotor winding copper bar material ( image 3 ), you can get the formula T L = T C ×(R L -R 0 ) / (R C -R 0 ) To calculate the real-time temperature T of the rotor winding 2 L . Where R 0 Is the temperature T provided by the manufacturer C Corresponding rotor winding resistance R C Converted to the resistance value of the rotor winding at 0℃, R 0 =R C / (1+α×T C ), α is a constant 0.00393. When R is given C Itself is T C When the resistance value at 0℃, the real-time temperature T of the rotor winding L =(R L / R C -1) / α.

Example Embodiment

[0034] Example 3, according to the resistance-temperature curve of the rotor winding copper bar material when the resistance value is zero ohm ( Figure 4 ), you can get the formula T L =(T C +235)×R L / R C -235, so as to calculate the real-time temperature T of the rotor winding 2 L .

[0035] In order to further eliminate the influence of the resistance of the carbon brush set 1 and the contact resistance between the carbon brush set 1 and the slip ring 3 on the monitoring temperature, it can also be used on the basis of the above embodiments figure 2 The connection method directly collects the DC voltage U between the two slip rings L . That is: the DC excitation power supply 7 is connected to the two carbon brush sets 1 fixed on the two slip rings 3 to form a loop, and an auxiliary carbon brush 10, which is electrically isolated from the corresponding carbon brush set 1, is added to each of the two slip rings 3, as a voltage Monitoring point; real-time collection of the DC v...

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 generator rotor winding temperature online monitoring method capable of monitoring generator rotor winding temperature online. The method includes the steps of collecting voltage UL and current IL of a rotor winding in real time to obtain resistance RL of the rotor winding during operation of a generator; then converting the resistance into a temperature value TL of the rotor winding during operation of the generator according to the resistance-temperature relation of the rotor winding. By means of the method, the effects of external loop resistance, carbon brush resistance and contact resistance of the rotor winding on the resistance and temperature of the rotor winding are removed. The method has the advantages of being accurate and convenient to monitor, high in efficiency, free of onsite testing and capable of monitoring the generator rotor winding temperature online.

Description

technical field [0001] The invention relates to a method for on-line monitoring of generator temperature, in particular to a method for on-line monitoring of generator rotor winding temperature. Background technique [0002] The temperature of the generator rotor winding is very important to the safe and stable operation of the generator. At present, there are roughly three types of methods for online monitoring of generator rotor winding temperature: [0003] The first type is to pre-embed the temperature measuring element on the rotor winding, and measure the temperature of the rotor winding through a slip ring or a wireless transmission-reception method. The measurement accuracy is high, but it is difficult to realize because some parts rotate with the rotor. The second type is to use infrared non-contact temperature measurement, but the infrared probe lens is easily affected by dust, oil, and water mist inside the generator, the effect is poor, the response time is slow...

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): G01K7/16
Inventor 曾广
Owner 贵阳新光电气有限公司
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