Transient Electromagnetic Torque Calculation Method for Short Circuit Fault of Turbo Generator Set

In order to comprehensively study and identify the electromagnetic torque (EMT) difference among the single static air-gap eccentricity (SAGE) fault, the single stator interturn short circuit fault (SISC), and the combined fault composed of these two, this article investigates the EMT ripple properties due to the mentioned three faults. Different from other studies, this paper considers not only the effect of the single fault types but also the impact of the single fault combinations on the EMT ripple characteristics. Detailed EMT expressions for each fault are firstly derived on the basis of the magnetic flux density (MFD) analysis. Then, finite element calculation and experimental study on a CS-5 prototype generator with two poles at 3000 rpm, which is specifically designed and manufactured ourselves, are carried out to validate the analysis result. It is found that the three faults will induce different ripple components in EMT. The combined faults have the most intensive impact sensitivity on the EMT ripples, while the single SAGE fault ranks the last in the impact effect.

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Theoretical research on short circuit fault of rotor inner winding in large turbo generator

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society ◽

10.1109/iecon.2012.6389063 ◽

2012 ◽

Author(s):

Bin Qin ◽

Wei Xu ◽

Nian Liu ◽

Yunhong Zhang ◽

Jiefeng Hu ◽

...

Keyword(s):

Short Circuit ◽

Theoretical Research ◽

Turbo Generator ◽

Short Circuit Fault

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Fault Diagnose of Rotor Winding Inter Turn Short Circuit in Generator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.1290 ◽

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.

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Electromagnetic Torque Characteristics Analysis of Nuclear Half-Speed Turbine Generator with Stator Winding Inter-Turn Short Circuit Fault

Journal of Electrical Engineering and Technology ◽

10.1007/s42835-021-00723-7 ◽

2021 ◽

Author(s):

Peng Xin ◽

Baojun Ge ◽

Dajun Tao ◽

Pin Lv

Keyword(s):

Short Circuit ◽

Stator Winding ◽

Electromagnetic Torque ◽

Turbine Generator ◽

Characteristics Analysis ◽

Short Circuit Fault

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.566.248 ◽

2012 ◽

Vol 566 ◽

pp. 248-252 ◽

Cited By ~ 1

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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Short-Circuit Fault Current Calculation Method for the Multi-Terminal DC Grid Considering the DC Circuit Breaker

Energies ◽

10.3390/en13061347 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1347

Author(s):

Haipeng Jia ◽

Jingyuan Yin ◽

Tongzhen Wei ◽

Qunhai Huo ◽

Jinke Li ◽

...

Keyword(s):

Calculation Method ◽

Short Circuit ◽

Circuit Breaker ◽

Fault Current ◽

Modular Multilevel Converter ◽

Multilevel Converter ◽

Dc System ◽

Short Circuit Calculation ◽

Dc Circuit Breaker ◽

Short Circuit Fault

The analysis and calculation of the short-circuit fault current in the DC grid is of great significance to the design and configuration of the converter station and DC circuit breaker parameters. The existing flexible DC system not only includes the modular multilevel converter (MMC) converter, but also needs power equipment such as the fault current limiter and DC circuit breaker. Therefore, the system modeling and short circuit calculation of the multi-terminal DC system after adding the DC circuit breaker are also of great significance for the design of DC power system parameters and the grid troubleshooting ability. In this paper, firstly, the parameters of the four-terminal DC system of the modular multilevel converter (MMC) are simplified, and the analytical solution of the short circuit fault current of the multi-terminal DC system is given. Then, the external characteristics of the cascaded hybrid DC circuit breaker are modeled. Based on the equivalent circuit of the fault current in different stages, the short circuit calculation method of four-terminal MMC system with DC circuit breaker is obtained. This method can effectively describe the overall trend of fault current and provide the basis for the configuration of DC line protection settings and DC circuit breaker related parameters.

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