Fault injection capable synchronous generator for condition based maintenance

2020

IJPHM

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Creating a unified fault diagnosis model that can detect faults across systems with different ratings (system independent fault diagnosis) would be of great interest in making condition-based maintenance (CBM) more popular. In this work, three phase synchronous generators with 3 and 5 kVA ratings are used for detecting stator inter-turn short circuit faults.Our baseline is a 3 kVA generator working at 1 A load during training and testing, to emulate the system/load dependent fault diagnosis. We obtained a classification accuracy of 99.75%, 100% and 100% for R phase, Y phase and B phase faults respectively. Subsequently, we evaluated the system for its load independent performance. Performance accuracy deteriorated due to the load specific variations (LSV) in the input feature vector (IFV). LSV is undesired, and we used nuisance attribute projection (NAP) to remove them. Using NAP, we obtained a performance improvement of 23.13%, 17.75% and 20.72% for three fault models on the 3 kVA generator and similar performance improvement was obtained for 5 kVA generator also.Further, we experimented for load and system independent fault diagnosis. In this case, we consider LSV and system specific variations (SSV) on IFV as undesired. We experimented with two types of NAP, (1) single step NAP, (2) stacked NAP. Experimental results show that the two staged stacked NAP outperforms. We obtained an improvement of 23.99%, 16.06% and 28.39%, in classification accuracy for three fault models, resulting in overall classification accuracy of 89.22%, 94.67% and 94.59% for R phase, Y phase and B phase fault models respectively.

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“…Design of stator winding is shown in Figure 1 and synchronous generator test setup is shown in Figure 2. Detailed description of test setup is elaborated in (Gopinath et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

System Independent Fault Diagnosis for Synchronous Generator

Gandhi

2020

IJPHM

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“…The short circuit faults were injected through a rheostat in a controlled manner for safety considerations. Details of the experimental setup can be found in (Gopinath et al, 2013). The specifications of the 3 kVA and 5 kVA synchronous generator is listed in Appendix A.…”

Section: Methodsmentioning

confidence: 99%

Intelligent fault diagnosis of synchronous generators

Expert Systems with Applications

Ramachandran

et al. 2016

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“…Each coil has lead terminals at 30%, 60% and 82% of the total number of turns. The detailed information about the experimental setup can be found in Gopinath et al (2013). The block diagram and photograph of experimental facility are shown in Figures 1 and 2.…”

Section: Methodsmentioning

confidence: 99%

Scalable fault models for diagnosis of synchronous generators

Ramachandran

2016

IJISTA

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