Abstract
A few methods for discerning broken rotor bar (BRB) fault and load oscillation in induction motors have been reported in the literature. However, they all perhaps inevitably fail in adverse cases in which these two phenomena are simultaneously present. To tackle this problem, an improved method for discerning BRB fault and load oscillation is proposed in this paper based on the following work. On the one hand, the theoretical basis is analytically extended to include such an adverse case, yielding some important findings on the spectra of the instantaneous reactive and active powers. A novel strategy is thus outlined to correctly discern BRB fault and load oscillation even when simultaneously present. On the other hand, Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT) is adopted as the spectral analysis technique to deal with the instantaneous reactive and active powers, yielding a certain improvement compared to the existing methods, adopting Fast Fourier Transform (FFT). Simulation and experimental results demonstrate that the proposed method can correctly discern BRB fault and load oscillation even when simultaneously present.
Highlights
Significant attention has been paid to the detection of broken rotor bar (BRB) faults in induction motors [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
It has been widely recognized that load oscillation, of which the frequency f L is next to 2sf s, produces similar effects as BRB fault on the stator current and confuses the BRB fault detection based on the spectral analysis of the stator current [10,11,12,13,14,15,16,17]
Based on the spectral analysis of the Instantaneous Reactive Power (IRP), Instantaneous Active Power (IAP) and their derived signals such as the instantaneous power factor. All these methods perhaps fail in the adverse case that BRB fault and load oscillation are simultaneously present and especially, perforce fail in the most adverse case that f L is absolutely equal to 2sf s, as reported in Reference [16]
Summary
Significant attention has been paid to the detection of broken rotor bar (BRB) faults in induction motors [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. The spectral analysis of the stator current has been widely applied to detect BRB faults [1,2,3,4,5,6,7,8] This technique consists of monitoring of the stator current components at (1 ± 2s)f s (where s is the motor slip and f s is the supply frequency), which are related to BRB fault. The instantaneous active and reactive components of the current space vector [15], were analyzed to detect BRB fault These techniques consist of monitoring the components at 2sf s (twice the slip frequency) superimposed by BRB fault in the IRP, IAP and the other signals. Some methods have been presented in References [10,11,12,13,14,15]
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