A New Detection Coil Capable of Performing Online Diagnosis of Excitation Winding Short-Circuits in Steam-Turbine Generators
Because excitation winding short-circuit faults that occur in steam-turbine generator will lead to heavy financial losses, accurately detecting excitation winding short-circuits (EWS) can help power generation operations. It can allow them to take timely actions and shorten downtime as well as cut t...
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| Published in | IEEE transactions on energy conversion Vol. 33; no. 1; pp. 106 - 115 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
New York
IEEE
01.03.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Because excitation winding short-circuit faults that occur in steam-turbine generator will lead to heavy financial losses, accurately detecting excitation winding short-circuits (EWS) can help power generation operations. It can allow them to take timely actions and shorten downtime as well as cut the costs of troubleshooting. This paper introduces a method for detecting EWS faults online using a new detection coil. Here, a large-dimension detection coil is installed inside the generator to span over an iron-core segment in the stator. The even or fractional harmonics induced by the detection coil are used to determine whether an EWS fault has happened, and the short circuit position can also be determined. This method can reveal short-circuit faults that occur in one turn of the excitation winding, and with obviously higher sensitivity. |
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| AbstractList | Because excitation winding short-circuit faults that occur in steam-turbine generator will lead to heavy financial losses, accurately detecting excitation winding short-circuits (EWS) can help power generation operations. It can allow them to take timely actions and shorten downtime as well as cut the costs of troubleshooting. This paper introduces a method for detecting EWS faults online using a new detection coil. Here, a large-dimension detection coil is installed inside the generator to span over an iron-core segment in the stator. The even or fractional harmonics induced by the detection coil are used to determine whether an EWS fault has happened, and the short circuit position can also be determined. This method can reveal short-circuit faults that occur in one turn of the excitation winding, and with obviously higher sensitivity. |
| Author | Minghan, Ma Yucai, Wu Yonggang, Li |
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| References | fišer (ref18) 0 wu (ref14) 2016; 31 wu (ref1) 2015 wu (ref4) 2015; 43 wu (ref3) 2011; 36 wu (ref8) 2010; 25 ref17 (ref10) 2014; 29 ref16 wu (ref13) 2015; 30 ref7 ref6 wu (ref2) 2013; 8 ref5 li (ref9) 2009; 29 li (ref12) 0 sun (ref15) 2014; 34 li (ref11) 0 |
| References_xml | – start-page: 1 year: 0 ident: ref18 article-title: Modeling, analysis and detection of rotor field winding faults in synchronous generators publication-title: Proc 5th Int Conf Elect Mach and Syst contributor: fullname: fišer – year: 2015 ident: ref1 article-title: Typical problem analysis and fault diagnosis of turbine generator rotor contributor: fullname: wu – start-page: 1050 year: 0 ident: ref11 article-title: The criterion on inter-turn short circuit fault diagnose of steam turbine generator rotor windings publication-title: Proc 5th Int Conf Elect Mach and Syst contributor: fullname: li – volume: 29 start-page: 96 year: 2009 ident: ref9 article-title: Influence of rotor windings inter-turn short circuit fault on electric machine shaft voltage publication-title: Proc Chin Soc Elect Eng contributor: fullname: li – volume: 29 start-page: 107 year: 2014 ident: ref10 article-title: Experimental study of rotor inter-turn short circuit fault diagnosis in turbine generator based on characteristic frequency of end-leakage-flux publication-title: Trans China Electrotech Soc – start-page: 763 year: 0 ident: ref12 article-title: On-line fault detection of inter-turn short circuits in turbo-generator rotor windings publication-title: Proc 5th Int Conf Elect Mach and Syst contributor: fullname: li – volume: 30 start-page: 183 year: 2015 ident: ref13 article-title: Diagnosis of rotor winding interturn short-circuit in turbine generators using virtual power publication-title: IEEE Trans Energy Convers doi: 10.1109/TEC.2014.2339300 contributor: fullname: wu – volume: 34 start-page: 917 year: 2014 ident: ref15 article-title: A new type of search coil for detecting inter-turn faults in synchronous machines publication-title: Proc Chin Soc Elect Eng contributor: fullname: sun – ident: ref6 doi: 10.1109/TEC.2011.2169264 – volume: 8 start-page: 608 year: 2013 ident: ref2 article-title: Research into unbalanced electromagnetic force resulting from rotor winding-related short circuit of turbine generator publication-title: Int Rev Elect Eng contributor: fullname: wu – ident: ref17 doi: 10.1109/ICELMACH.2008.4799973 – volume: 43 start-page: 674 year: 2015 ident: ref4 article-title: An analysis of the impact of rotor winding interturn short circuits on turbine generator operating variables publication-title: Electr Power Compon Syst doi: 10.1080/15325008.2014.999144 contributor: fullname: wu – ident: ref16 doi: 10.1109/TEC.2012.2216270 – volume: 25 start-page: 178 year: 2010 ident: ref8 article-title: Diagnosis of non-salient pole synchronous generator rotor's typical faults based on shaft voltage publication-title: Trans China Electrotech Soc contributor: fullname: wu – volume: 36 start-page: 2687 year: 2011 ident: ref3 article-title: Analysis of turbine generator rotor vibration characteristic under electromechanical compound fault publication-title: High Voltage Eng contributor: fullname: wu – ident: ref7 doi: 10.1109/60.326478 – volume: 31 start-page: 706 year: 2016 ident: ref14 article-title: Diagnosis of short circuit faults within turbogenerator excitation winding based on the expected electromotive force method publication-title: IEEE Trans Energy Convers doi: 10.1109/TEC.2016.2521422 contributor: fullname: wu – ident: ref5 doi: 10.1109/TEC.2014.2350336 |
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| SubjectTerms | Circuit faults Coils (windings) Downtime Electric power generation Excitation Excitation winding short-circuit (EWS) Fault detection Generators Harmonic analysis harmonics magnetic field Magnetic flux Maintenance novel detection coil online diagnosis Rotors Short circuits Stators Steam electric power generation threshold Turbines Turbogenerators Winding Windings |
| Title | A New Detection Coil Capable of Performing Online Diagnosis of Excitation Winding Short-Circuits in Steam-Turbine Generators |
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