scholarly journals Analysis on exciting winding electromagnetic force of Turbo-generator under rotor interturn short circuit fault

2016 ◽  
Author(s):  
Hao Zhong ◽  
Yuling He ◽  
Guiji Tang ◽  
Yuchao Meng ◽  
Weiqi Deng
Keyword(s):  
Electromagnetic Force ◽  
Short Circuit ◽  
Turbo Generator ◽  
Short Circuit Fault

scholarly journals Electromagnetic Force and Mechanical Response of Turbo-Generator End Winding under Electromechanical Faults

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Hong-Chun Jiang ◽  
Yu-Ling He ◽  
Gui-Ji Tang ◽  
Xing-Hua Yuan
Keyword(s):  
Fatigue Failure ◽  
Electromagnetic Force ◽  
Mechanical Response ◽  
Short Circuit ◽  
Three Dimensional ◽  
Distribution Law ◽  
Turbo Generator ◽  
Before And After ◽  
Variation Characteristics ◽  
Static Eccentricity

This paper comparatively studies the electromagnetic force and mechanical response of the end winding before and after 3 kinds of typical electromechanical faults in turbo-generator. The analytical expression of electromagnetic force of end winding is derived under the composite fault of static eccentricity and rotor interturn short circuit. Meanwhile, the three-dimensional transient finite element simulation is carried on, and the frequency composition and amplitude variation characteristics of the radial, axial, and tangential electromagnetic force are analyzed for the end windings under static eccentricity, rotor interturn short circuit, and composite fault. Therefore, it provides a reference for the vibration wear detection and electromagnetic force control of the end winding. Moreover, the maximum stress and deformation of different positions on the end involute are obtained. And the three-directional vibration acceleration characteristics of the end winding are further analyzed. Finally, the distribution law of winding fatigue failure and vibration wear is acquired, which lays a foundation for the reverse suppression of end winding fatigue failure and insulation wear.

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.

Fault Diagnose of Rotor Winding Inter Turn Short Circuit in Generator

2013 ◽  
Vol 321-324 ◽  
pp. 1290-1294
Author(s):  
Hai Yan Xiao ◽  
Xue Wu Wang ◽  
Deng Feng Chen
Keyword(s):  
Short Circuit ◽  
Reference Wave ◽  
Magnetic Characteristics ◽  
Wave Form ◽  
Fault Diagnose ◽  
Turbo Generator ◽  
Half Wave ◽  
Wave Forms ◽  
Rotor Winding ◽  
Short Circuit Fault

Based on magnetic characteristics of inter turn circuit of rotor windings in turbo generator, and analysis the principles of detecting coil method. Based on the symmetry of generator structure and magnetic character between stator and rotor, three fault diagnose methods are presented in this paper: Wave form limitations, Half-wave sliding superposition and Reference wave forms. The application example shows that Reference wave forms method is capable of diagnosing inter turn fault, its severity, and especially locating the inter turn short circuit fault.

Study on Dynamic Response of Torsional Vibration of Turbo-Generator Unit Caused by Short Circuit Fault

2012 ◽  
Vol 566 ◽  
pp. 248-252 ◽  
Author(s):  
Cheng Bing He ◽  
Dong Chao Chen ◽  
Yu Jiong Gu
Keyword(s):  
Torsional Vibration ◽  
Short Circuit ◽  
Dynamic Responses ◽  
Stable Operation ◽  
Two Phase ◽  
Time Frequency ◽  
Turbo Generator ◽  
Complex Morlet Wavelet ◽  
Generator Terminal ◽  
Short Circuit Fault

When short circuit faults happen near power plant or generator terminal, severe transient torque shock will act on the shaft system, which seriously affects the safe and stable operation of the unit. Using the increment transfer matrix method, the dynamic responses of torsional vibrations are calculated in this work. Combined with the complex Morlet wavelet and time-frequency contour map, the time-frequency domain characters of dynamic torque are analyzed. The analyzed results show that the torque value caused by three phase short circuit fault is largest. The order of torque value from high to low is two phase short circuit to ground, two phase interphase short circuit and single phase short circuit. The electric distance between short circuit point and generator is more short, and the torsional vibration is more serious.

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