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7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Flux Conference 2012
Verification of fault condition behaviour of asynchronous 2-pole generator using Flux 2-Dfinite element analysis software
W. Doorsamy
University of the WitwatersrandDate : 18 October 2012
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 20122
Overview
Introduction
Background
Methodology
Experimental Setup
Flux Model
Fault Conditioning
Measurement
Results
Conclusion
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 20123
Introduction
Increased load demands
Alternative methods of energy generation/ sources as a solution
Integrity of current generation systems have to be increased
Need for simple, reliable and cost effective condition monitoring
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 20124
Introduction
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Background
Online and offline methods of conditioning monitoring
Fault diagnosis accomplished through various methods:
Chemical
Mechanical
Electrical
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Background
Diagnosis of incipient faults is essential prevention of extended
downtime and even catastrophic failure
Current methods utilise symptoms of damage/deterioration
Unacceptable
Previous work conducted on use of shaft signals for fault
diagnosis
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Methodology
Consolidation of previous work conducted on fault diagnosis
Identification of exact effects of faults on shaft and flux probe
Simulation of fault conditions Experimental testing
Validation
Extend to use in multiple fault diagnosis
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Experimental Setup
Miniature Generator designed to mimic large turbo-generators
Some Capabilities of Generator
20 kVA, 2 Pole, 340 V (line)
Cylindrical Rotor Core
Insulated Bearings
Open stator slots
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Experimental Setup
Mini-Gen designed with additional features
Access to stator and rotor windings
Outboard slip rings for static excitation
Finished landings on shaft for use of specialised brushes
Stator position relative to rotor may be manipulated
Flux probes/search coils at various angular positions
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Experimental Setup
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Experimental
Setup
Three Phase
Rectifier
Mini-Gen
Shaft Brushes
Induction Motor(Prime Mover)
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Flux Model
Casing
Stator
Slots
Air Gap
Rotor Core
Rotor Slots
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Flux Model
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Fault Conditioning
Incipient faults to analyse
3 Rectifier
Excitation winding short-circuit
Static Eccentricity
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Fault Conditioning Rectifier Fault
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Fault Conditioning Rectifier Fault
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Fault Conditioning Rotor Short
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Fault Conditioning Rotor Short
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Fault Conditioning Rotor Short
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
7/30/2019 07 Verification of Fault Condition Behaviour of Synch 2-Pole Generator Using Flux 2D W-Doorsamy UNI Witwatersrand
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Fault Conditioning Eccentricity
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Fault Conditioning Eccentricity
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Measurement
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
Probe
Brushes
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Measurement
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
Flux probe connector Shaft brush insert
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Results
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
% Changetends toinfinity due to
normalcondition 6th
harmonic 0
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Results Rectifier Fault
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
Flux Probe
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Results Rectifier Fault
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
ConditionHarmonic
(Hz)
Simulation Measurement
Percentage Change (%)
No Load200 657.10 94.00
250 43.99 38.24
With Load200 95.04 140.11
250 51.83 124.17
Shaft Brushes
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Results Eccentricity
Reasons for large harmonic change (Simulation)
Simulation baseline (without fault) value at 300 Hz 0, therefore
% change
Real machine baseline (without fault) value has asymmetries
(imperfections)
Presence of noise
Sensitivity of simulation i.e. no observation effects unlike with real
setup
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Results Fault Diagnosis System
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Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Conclusion
Reasons for large harmonic change (expected)
Simulation predict behaviour and optimise experiment
Experimental results validate simulation predictions
Algorithm -> viable
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Acknowledgements
EIE - University of the Witwatersrand
Professor W. A. Cronje
National Research Foundation
Cedrat
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 2012
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Thank you
Verification of fault condition behaviour of a synchronous 2-pole generator
2012 Flux Conference - Rome, Italy, October 17-18, 201231