Development of a technique for on-line detection of shorts in field windings of turbine-generator rotors: circuit design and testing

Kulkarni, Ajay; El-Sharkawi, M.A.; Marks, Robert J.; Andexler, G.; Xing, Jian; Kerszenbaum, Isidor

doi:10.1109/60.849109

Cited by 22 publications

(5 citation statements)

References 5 publications

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“…At present, the main detection methods include the opening transformer method, detection coil method , excitation current method, multi‐loop method , and others . The first method is sensitive but is an offline detection method; it detects the fault only when the rotor stops.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of rotor winding inter‐turn short‐circuit of hydro‐generator based on no‐load curve reverse calculation

Wang

2018

IEEJ Transactions Elec Engng

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The rotor winding inter‐turn short‐circuit in hydro‐generators has been plaguing power producers in terms of production safety and economy. At present, the fault detection methods for hydro‐generator rotors are offline or complex. To solve this problem, this paper presents the no‐load curve reverse calculation method. The method only requires electrical parameters such as the active power, reactive power, voltage, and current. This method calculates the normal excitation current using the hydro‐generator's electromagnetic relationship and the no‐load curve in the case of saturated operation. It can identify the inter‐turn short‐circuit fault by comparing the difference between the normal calculated excitation current and the measured excitation current. The correctness of this method is verified with an experiment using an actual hydro‐generator of a hydropower plant and a faulty synchronous generator. Based on the no‐load curve method, the rotor inter‐turn short‐circuit fault diagnosis system is developed by the research team. The diagnostic system does not need to increase the new monitoring point of the hydro‐generator by reading the original electrical parameters of the generator to diagnose the hydro‐generator rotor inter‐turn short‐circuit fault online. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Introductionmentioning

confidence: 99%

Diagnosis of rotor winding inter‐turn short‐circuit of hydro‐generator based on no‐load curve reverse calculation

Wang

2018

IEEJ Transactions Elec Engng

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“…The reflected signals can produce a signature signal that contains information about the rotor's state. The development of power electronic circuits for generation of the twin signals and detection of the reflected signals has been described in [10]. The design and fabrication of a lab model to test this technique is summarized along with the results of laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Amplitude and Frequency Characteristics of the Rotor Unbalanced Magnetic Pull of a Multi-Pole Synchronous Generator with Inter-Turn Short Circuit of Field Windings

Guangtao

2018

Energies

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Inter-turn short circuit of field windings (ISCFW) is a common generator fault which can result in serious safety accidents for power systems, if the fault is not eliminated in time. Taking advantage of the electrical and mechanical characteristics of the generator after a fault as a fault criterion is a new idea for fault monitoring, so finding out the frequency and amplitude frequency characteristics of rotor unbalanced magnetic pull (UMP)-the vibration excitation source of the fault-is the basis and key of the research. Taking a six-pole generator as an example, the effects of harmonic magnetic motive force (MMF) interaction on rotor UMP, as well as the frequency characteristics of rotor UMP after generator faults in different stator windings, are obtained based on the analysis of the air-gap MMF of the generator after a fault, and the results of theoretical analysis are verified by simulation. Based on the above results, the simulation calculation on rotor UMP of generators with three stator winding forms under different operating conditions has been achieved, to get the relation between rotor UMP amplitude and active power and field current, and to find out the mechanism of rotor UMP amplitude change along with operating conditions and effect of stator winding forms on UMP amplitude by theoretical analysis. The conclusions are of important significance for studying fault mechanical characteristics of generators and lay a foundation for online monitoring on ISCFW by integrating mechanical and electrical information.

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“…Further more, it is difficult to realize with the affection of the factors like slot wedge etc. [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis Based on ANN for Turn-to-Turn Short Circuit of Synchronous Generator Rotor Windings

Z.¹,

Pu²

2009

JEMAA

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Rotor winding turn-to-turn short circuit is a common electrical fault in steam turbines. When turn-to-turn short circuit fault happens to rotor winding of the generator, the generator terminal parameters will change. According to these parameters, the conditions of the rotor winding can be reflected. However, it is hard to express the relations between fault information and generator terminal parameters in accurate mathematical formula. The satisfactory results in fault diagnosis can be obtained by the application of neural network. In general, the information about the severity level of the generator faults can be acquired directly when the faulty samples are found in the training samples of neural network. However, the faulty samples are difficult to acquire in practice. In this paper, the relations among active power, reactive power and excitation current are discovered by analyzing the generator mmf with terminal voltage constant. Depending on these relations, a novel diagnosis method of generator rotor winding turn-to-turn short circuit fault is proposed by using ANN method to obtain the fault samples directly, without destructive tests

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Development of a technique for on-line detection of shorts in field windings of turbine-generator rotors: circuit design and testing

Cited by 22 publications

References 5 publications

Diagnosis of rotor winding inter‐turn short‐circuit of hydro‐generator based on no‐load curve reverse calculation

Diagnosis of rotor winding inter‐turn short‐circuit of hydro‐generator based on no‐load curve reverse calculation

Analysis on the Amplitude and Frequency Characteristics of the Rotor Unbalanced Magnetic Pull of a Multi-Pole Synchronous Generator with Inter-Turn Short Circuit of Field Windings

Fault Diagnosis Based on ANN for Turn-to-Turn Short Circuit of Synchronous Generator Rotor Windings

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