Modeling, analysis and detection of rotor field winding faults in synchronous generators

Fišer, Rastko; Makuc, Danilo; Lavric, Henrik; Miljavec, Damijan; Bugeza, M.

doi:10.1109/icelmach.2010.5608042

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…As each rotor slot passes the flux probe, a difference in the induced voltage waveform in a search coil caused by magnetic poles is detectable. An inter-turn fault in a coil reduces the peaks associated with the two opposite slots containing the faulted coil, thus, the presence of shorted turns could be detected [76].…”

Section: F I G U R E 6 Fault Diagnosis Flow-chartmentioning

confidence: 99%

An overview of various faults detection methods in synchronous generators

Mostafaei

Faiz

2021

IET Electric Power Appl

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Synchronous generator (SG) plays a vital and critical role in the power system by supplying electric power to consumers. Various faults in SGs can cause some catastrophic events such as power disruption or blackout. These faults can be classified into two electrical and mechanical faults. Short circuit in stator windings and field winding are electrical fault while bearing, static/dynamic eccentricity, and broken damper bars faults are mechanical one. Unlike the induction machines, there are no much researches in SGs condition monitoring owing to its complex behaviour against the faults. Herein, the SG modelling approaches are presented briefly to elaborate shortcoming and challenging issues in the modelling, and then a comprehensive review of various electrical and mechanical fault detection methods is presented.

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Section: F I G U R E 6 Fault Diagnosis Flow-chartmentioning

confidence: 99%

An overview of various faults detection methods in synchronous generators

Mostafaei

Faiz

2021

IET Electric Power Appl

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“…The magnetic flux in the air gap, corresponding to the pole with the shorted turns, is smaller in comparison with the magnetic flux of other poles. The literature [7,10] provides the simulation of changes in magnetic flux (or magnetic flux density), which is a consequence of the occurrence of shorted turns in the windings of the rotor poles.…”

Section: Shorted Turnsmentioning

confidence: 99%

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

Babic

Milić

Rakić

2017

IET Electric Power Applications

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In this study, the authors propose a fault detection algorithm used in an on-line magnetic monitoring system in the hydropower plant. The proposed algorithm is based on two magnetic measuring methods: measurement of (inner) flux within generator in air gap and measurement of stator leakage (outer) flux outside of the generator. The system has to ensure, in situ and real time, magnetic monitoring and fault detection of hydrogenerator. The monitoring system is also useful for modern maintenance approach such as a condition based maintenance without generators' work interruption and better planned and preventive maintenance in the power plant. The proposed system successfully detects the presence of magnetic unbalance of hydrogenerator, occurring as a consequence of shorted turns in the windings of the rotor poles or air gap asymmetry. The presented measurement results are achieved in real exploitation conditions.

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“…The coil detection method is an earlier way to detect this fault which is realized by extracting the fault magnetic field features by means of a detection conductor or coil in the air gap. Reference [7] described that the comparative measurement of the magnetic flux density produced by each winding can provide a coil detection method by placing a measuring coil tangentially and near to the rotor; Reference [8] analyzed the magnetic field in detail for several operating conditions under healthy and faulty states which are difficult or even impossible to carry out by available measurement methods in industrial environments and realizes on-line condition monitoring by the permanent installation of a flux probe on the stator to measure the rotor magnetic flux. The disadvantages of this method is that detection coils must be installed on the generator, which is hard to realize for generators that have already been put into operation.…”

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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Modeling, analysis and detection of rotor field winding faults in synchronous generators

Cited by 13 publications

References 9 publications

An overview of various faults detection methods in synchronous generators

An overview of various faults detection methods in synchronous generators

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

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

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