scholarly journals Analysis and location of Turn-To-Turn short circuit of rotor windings in generator

2021 ◽  
Vol 233 ◽  
pp. 04018
Author(s):  
Yucheng Zhang ◽  
Zenghuan Sun
Keyword(s):  
Power Loss ◽  
Short Circuit ◽  
Ac Impedance ◽  
Test Method ◽  
Running Time ◽  
Generator Rotor ◽  
Rotor Winding

With the increase of generator running time, the probability of generator rotor problems increases constantly. In this paper, a generator is taken as an example. During maintenance, the generator is found to have the evidence of turn-to-turn short circuit of rotor windings by the repetitive surge oscilloscope method, which is verified by the AC impedance power loss test of the rotor winding. The position of turn-to-turn short circuit is determined by the inter-pole voltage method and the coil voltage method. The accuracy of the test method is further verified by the generator rotor’s return repair.

Impact of Rotor Inter-Turn Short-Circuit on Generator Rotor Force

2011 ◽  
Vol 143-144 ◽  
pp. 125-131 ◽  
Author(s):  
Yong Gang Li ◽  
Guo Wei Zhou ◽  
Yu Ca Wu ◽  
He Ming Li
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Force ◽  
Short Circuit ◽  
Total Force ◽  
Distribution Law ◽  
Generator Rotor ◽  
Finite Element Software ◽  
Full Force ◽  
Rotor Winding ◽  
Short Circuit Fault

This paper analyzes the calculation method of unbalanced electromagnetic force by rotor winding inter-turn short-circuit fault, analytical calculating method neglects saturation, cogging and other factors, so the calculation accuracy is not high, in order to accurately calculate the magnetic field and the unbalanced electromagnetic force, this paper propose to analyze generator magnetic field by a finite element software Ansys, the obtained magnetic field data are further used to analyze the distributed electromagnetic force and the total force that generator rotor suffered, electromagnetic force distribution law of different slots, different levels of inter-turn short-circuit are got, which provide a basis for further studying the full force on generator rotor.

Designing of Micro-Motor Rotor Winding Fault Detection System Based on DSP

2014 ◽  
Vol 1030-1032 ◽  
pp. 1469-1474
Author(s):  
Dao Wei Gong ◽  
Ming Quan Shi ◽  
Zhen Feng Han ◽  
Xiao Dong Wang
Keyword(s):  
Fault Detection ◽  
Production Line ◽  
Detection Method ◽  
Detection System ◽  
Short Circuit ◽  
Test Method ◽  
Production Testing ◽  
Pulse Test ◽  
Rotor Winding ◽  
Short Circuit Fault

With the production line testing requirement of the micro-motor rotor which is less than 10mm in diameter, an improved rotor detection method based on the pulse test method was presented for the rotor fault detection. This paper analyzed the operating principle of the method and simulated on the Matlab platform. Moreover, the rotor detection system centered on the DSP processor was designed to detect the rotor fault. The result showed that the method could quickly and accurately detect the inter-turn short circuit fault and determine the deep of short circuit. The degree of detection is up to 4% level, which meets the actual production testing requirement.

The Research and Identify on Hydro Generator Rotor Windings Short-Circuit Fault

2014 ◽  
Vol 1033-1034 ◽  
pp. 1343-1349
Author(s):  
Yong Gang Li ◽  
Jie Jia ◽  
Liu Wan
Keyword(s):  
Theoretical Calculations ◽  
Circuit Simulation ◽  
Short Circuit ◽  
Hydroelectric Power Plant ◽  
Stable Operation ◽  
Hydroelectric Power ◽  
Load Curve ◽  
Turbine Generator ◽  
Generator Rotor ◽  
Rotor Winding

Hydro-generator unit is the most important energy conversion device in the hydropower, which is directly related to the safety and reliability and stable operation of the hydroelectric power plant. When the turbine generator rotor winding inter-turn short circuit occurs, the proposed method using load curve electromagnetic characteristics analysis, the use of before and after the failure to find the relative change in the excitation current failure rate as the identification method, the criterion may reflect the severity of the failure, perform theoretical calculations, and thus the inter-turbine generator rotor windings short circuit simulation, consistent with the conclusions of the theoretical analysis.

scholarly journals In-Situ Measurement of Power Loss for Crystalline Silicon Modules Undergoing Thermal Cycling and Mechanical Loading Stress Testing

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 72
Author(s):  
Sergiu Spataru ◽  
Peter Hacke ◽  
Dezso Sera
Keyword(s):  
Thermal Cycling ◽  
Power Loss ◽  
Stress Testing ◽  
Series Resistance ◽  
Short Circuit ◽  
In Situ Measurement ◽  
Mechanical Degradation ◽  
Model Parameters ◽  
The Impact

An in-situ method is proposed for monitoring and estimating the power degradation of mc-Si photovoltaic (PV) modules undergoing thermo-mechanical degradation tests that primarily manifest through cell cracking, such as mechanical load tests, thermal cycling and humidity freeze tests. The method is based on in-situ measurement of the module’s dark current-voltage (I-V) characteristic curve during the stress test, as well as initial and final module flash testing on a Sun simulator. The method uses superposition of the dark I-V curve with final flash test module short-circuit current to account for shunt and junction recombination losses, as well as series resistance estimation from the in-situ measured dark I-Vs and final flash test measurements. The method is developed based on mc-Si standard modules undergoing several stages of thermo-mechanical stress testing and degradation, for which we investigate the impact of the degradation on the modules light I-V curve parameters, and equivalent solar cell model parameters. Experimental validation of the method on the modules tested shows good agreement between the in-situ estimated power degradation and the flash test measured power loss of the modules, of up to 4.31 % error (RMSE), as the modules experience primarily junction defect recombination and increased series resistance losses. However, the application of the method will be limited for modules experiencing extensive photo-current degradation or delamination, which are not well reflected in the dark I-V characteristic of the PV module.

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