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Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings

North China Electric Power University Dept. of Electrical Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Baoding 071003, China
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Energies 2019, 12(7), 1378; https://doi.org/10.3390/en12071378
Received: 28 February 2019 / Revised: 25 March 2019 / Accepted: 30 March 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Analysis for Electrical Machines Monitoring)
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Abstract

Online and location detection of rotor winding inter-turn short circuits are an important direction in the field of fault diagnosis in turbo-generators. This area is facing many difficulties and challenges. This study is based on the principles associated with the U-shaped detection coil method. Compared with dynamic eccentricity faults, the characteristics of the variations in the main magnetic field after a turn-to-turn short circuit in rotor windings were analyzed and the unique characteristics were extracted. We propose that the degree of a turn-to-turn short circuit can be judged by the difference in the induction voltage of the double U-shaped detection coils mounted on the stator core. Here, the faulty slot position was determined by the local convex point formed by the difference in the induced voltage. Numerical simulation was used here to determine the induced voltage characteristics in the double U-shaped coils caused by the turn-to-turn short circuit fault. We analyzed the dynamic eccentricity fault as well as combined the fault of a turn-to-turn short circuit and dynamic eccentricity. Finally, we demonstrate the positive anti-interference performance associated with this fault detection method. This new online detection method is satisfactory in terms of sensitivity, speed, and positioning, and overall performance is superior to the traditional online detection methods. View Full-Text
Keywords: turbo-generator; rotor winding; turn-to-turn short circuit; dynamic eccentricity; detection coil; judge turbo-generator; rotor winding; turn-to-turn short circuit; dynamic eccentricity; detection coil; judge
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, Y.; Ma, G. Anti-Interference and Location Performance for Turn-to-Turn Short Circuit Detection in Turbo-Generator Rotor Windings. Energies 2019, 12, 1378.

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