Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage
Inter-turn short circuit in the excitation windings of synchronous condensers is a common fault that directly impacts their normal operation. However, current fault analysis and diagnosis of synchronous condensers primarily rely on voltage-balanced conditions, while research on short-circuit faults...
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MDPI AG
2023-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/15/5695 |
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| author | Junqing Li Chengzhi Zhang Yuling He Xiaodong Hu Jiya Geng Yapeng Ma |
| author_facet | Junqing Li Chengzhi Zhang Yuling He Xiaodong Hu Jiya Geng Yapeng Ma |
| author_sort | Junqing Li |
| collection | DOAJ |
| description | Inter-turn short circuit in the excitation windings of synchronous condensers is a common fault that directly impacts their normal operation. However, current fault analysis and diagnosis of synchronous condensers primarily rely on voltage-balanced conditions, while research on short-circuit faults under unbalanced voltage conditions is limited. Therefore, this paper aims to analyze the fault characteristics of inter-turn short circuits in the excitation windings of synchronous condensers under unbalanced grid voltage. Mathematical models were developed to represent the air gap flux density and stator parallel currents for four operating conditions: normal operation and inter-turn short circuit fault under balanced voltage, as well as a process without fault and with inter-turn short circuit fault under unbalanced voltage. By comparing the harmonic content and amplitudes, various aspects of the fault mechanism of synchronous condensers were revealed, and the operating characteristics under different conditions were analyzed. Considering the four aforementioned operating conditions, finite element simulation models were created for the TTS-300-2 synchronous condenser in a specific substation as a case study. The results demonstrate that the inter-turn short circuit fault in the excitation windings under unbalanced voltage leads to an increase in even harmonic currents in the stator parallel currents, particularly the second and fourth harmonics. This validates the accuracy of the theoretical analysis findings. |
| first_indexed | 2024-03-11T00:28:34Z |
| format | Article |
| id | doaj.art-989807286a864192851fd655558050d2 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T00:28:34Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-989807286a864192851fd655558050d22023-11-18T22:51:38ZengMDPI AGEnergies1996-10732023-07-011615569510.3390/en16155695Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced VoltageJunqing Li0Chengzhi Zhang1Yuling He2Xiaodong Hu3Jiya Geng4Yapeng Ma5School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, ChinaSchool of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, ChinaDepartment of Mechanical Engineering, North China Electric Power University, Baoding 071003, ChinaSchool of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, ChinaSchool of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, ChinaSchool of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, ChinaInter-turn short circuit in the excitation windings of synchronous condensers is a common fault that directly impacts their normal operation. However, current fault analysis and diagnosis of synchronous condensers primarily rely on voltage-balanced conditions, while research on short-circuit faults under unbalanced voltage conditions is limited. Therefore, this paper aims to analyze the fault characteristics of inter-turn short circuits in the excitation windings of synchronous condensers under unbalanced grid voltage. Mathematical models were developed to represent the air gap flux density and stator parallel currents for four operating conditions: normal operation and inter-turn short circuit fault under balanced voltage, as well as a process without fault and with inter-turn short circuit fault under unbalanced voltage. By comparing the harmonic content and amplitudes, various aspects of the fault mechanism of synchronous condensers were revealed, and the operating characteristics under different conditions were analyzed. Considering the four aforementioned operating conditions, finite element simulation models were created for the TTS-300-2 synchronous condenser in a specific substation as a case study. The results demonstrate that the inter-turn short circuit fault in the excitation windings under unbalanced voltage leads to an increase in even harmonic currents in the stator parallel currents, particularly the second and fourth harmonics. This validates the accuracy of the theoretical analysis findings.https://www.mdpi.com/1996-1073/16/15/5695synchronous condenserunbalanced voltageinter-turn short circuit in excitation windingsfinite elementfault analysisstator parallel currents |
| spellingShingle | Junqing Li Chengzhi Zhang Yuling He Xiaodong Hu Jiya Geng Yapeng Ma Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage Energies synchronous condenser unbalanced voltage inter-turn short circuit in excitation windings finite element fault analysis stator parallel currents |
| title | Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage |
| title_full | Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage |
| title_fullStr | Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage |
| title_full_unstemmed | Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage |
| title_short | Impact of Inter-Turn Short Circuit in Excitation Windings on Magnetic Field and Stator Current of Synchronous Condenser under Unbalanced Voltage |
| title_sort | impact of inter turn short circuit in excitation windings on magnetic field and stator current of synchronous condenser under unbalanced voltage |
| topic | synchronous condenser unbalanced voltage inter-turn short circuit in excitation windings finite element fault analysis stator parallel currents |
| url | https://www.mdpi.com/1996-1073/16/15/5695 |
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