Analysis of the Interturn Short Circuits of Stator Field Windings in Multiphase Angular Brushless Exciter at Nuclear Power Plant

Lv, Hao; Chang, Jiang; Hu, Liang; Wang, Xiaoming; Zong, Weijing; Lin, Guanghui

doi:10.1109/tec.2019.2937128

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Brushless synchronous machines (BSMs) are widely implemented in electricity generation power plants [1,2], high-efficiency processes [3], and systems where sparking should not happen, such as in aircraft applications [4,5]. The absence of brushes to feed the excitation winding of the main synchronous machine (SM) implies a second machine, called an exciter.…”

Section: Introductionmentioning

confidence: 99%

Contactless Rotor Ground Fault Detection Method for Brushless Synchronous Machines Based on an AC/DC Rotating Current Sensor

Pardo-Vicente,

Guerrero,

Platero

et al. 2023

Sensors

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Brushless synchronous machines (BSMs) are replacing conventional synchronous machines with static excitation in generation facilities due to the absence of sparking and lower maintenance. However, this excitation system makes measuring electric parameters in the rotor challenging. It is highly difficult to detect ground faults, which are the most common type of electrical fault in electric machines. In this paper, a ground fault detection method for BSMs is proposed. It is based on an inductive AC/DC rotating current sensor installed in the shaft. In the case of a ground fault in the rotating parts of the BSM, a fault current will flow through the rotor’s sensor, inducing voltage in its stator. By analyzing the frequency components of the induced voltage, the detection of a ground fault in the rotating elements is possible. The ground faults detection method proposed covers the whole rotor and discerns between DC and AC sides. This method does not need any additional power source, slip ring, or brush, which is an important advantage in comparison with the existing methods. To corroborate the detection method, experimental tests have been performed using a prototype of this sensor connected to laboratory synchronous machines, achieving satisfactory results.

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Section: Introductionmentioning

confidence: 99%

Contactless Rotor Ground Fault Detection Method for Brushless Synchronous Machines Based on an AC/DC Rotating Current Sensor

Pardo-Vicente,

Guerrero,

Platero

et al. 2023

Sensors

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show abstract

“…For the MPABE, References [12,21], respectively, analysed the diode open‐circuit fault and exciter stator winding short‐circuit fault. They proposed a fault harmonic component detection method based on the detection coil and field winding, which realize online faults detection by harmonic components induced by asymmetric air‐gap harmonic magnetomotive force (MMF) on detection coil and.…”

Section: Introductionmentioning

confidence: 99%

“…Based on model analysis, signal processing, artificial intelligence and other analysis methods, the fault diagnosis method using electrical signals and physical signals (such as pressure, vibration and temperature) are proposed. Additionally, there are also some references dealing with the fault analysis of the multiphase brushless exciter, mainly involving the fault analysis of rectifier [12][13][14], analysis of open-phase operation [15][16][17][18], inter-turn short-circuit of stator and rotor [19][20][21], sudden short-circuit of DC side [22] and other aspects. However, References [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] are mainly related to the three-phase brushless exciter and multi-phase star-type brushless exciters.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, there are also some references dealing with the fault analysis of the multiphase brushless exciter, mainly involving the fault analysis of rectifier [12][13][14], analysis of open-phase operation [15][16][17][18], inter-turn short-circuit of stator and rotor [19][20][21], sudden short-circuit of DC side [22] and other aspects. However, References [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] are mainly related to the three-phase brushless exciter and multi-phase star-type brushless exciters. Up to now, there is no relevant research been performed on the AWOPF of multi-phase brushless exciters with annular winding structure.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of armature winding open‐phase fault in multi‐phase annular brushless exciter at nuclear power plant

Chen

Wang³

et al. 2021

IET Electric Power Appl

Self Cite

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The multi-phase annular brushless exciter (MPABE) of nuclear power plants has suffered numerous armature winding open-phase faults (AWOPF) in the field operation. In order to achieve reliable protection of the MPABE, its AWOPF is systematically studied through theoretical analysis, simulation calculation and model machine experiments. First, proceeding from the armature current waveform in normal operation and the influence of the AWOPF on it, the armature reaction magnetomotive force (MMF) is analysed deeply. Then, the theoretical analysis about the harmonic electromotive force (EMF) induced by armature reaction MMF on the field winding is presented, obtaining the harmonic characteristics of field current: the even-order field harmonic currents increase obviously under the AWOPF. Finally, correlate experiments and simulations were performed on a customized experimental prototype. The experimental and simulation results are consistent and verify the conclusion of the theoretical analysis, which can serve as a theoretical basis for the monitoring and diagnosis method of the AWOPF in the MPABE. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Impact of RISC fault position on stator thermal behavior in synchronous generators

Zhang,

He,

et al. 2024

J Therm Anal Calorim

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Analysis of the Interturn Short Circuits of Stator Field Windings in Multiphase Angular Brushless Exciter at Nuclear Power Plant

Cited by 8 publications

References 24 publications

Contactless Rotor Ground Fault Detection Method for Brushless Synchronous Machines Based on an AC/DC Rotating Current Sensor

Contactless Rotor Ground Fault Detection Method for Brushless Synchronous Machines Based on an AC/DC Rotating Current Sensor

Analysis of armature winding open‐phase fault in multi‐phase annular brushless exciter at nuclear power plant

Impact of RISC fault position on stator thermal behavior in synchronous generators

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