{"title":"High-Frequency Spectrum Analysis of VFTO Generated inside Gas Insulated Substations","authors":"M. A. Abd-Allah, A. Said, Ebrahim A. Badran","volume":79,"journal":"International Journal of Electrical and Computer Engineering","pagesStart":904,"pagesEnd":912,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/16442","abstract":"
Worldwide many electrical equipment insulation
\r\nfailures have been reported caused by switching operations, while
\r\nthose equipments had previously passed all the standard tests and
\r\ncomplied with all quality requirements. The problem is mostly
\r\nassociated with high-frequency overvoltages generated during
\r\nopening or closing of a switching device. The transients generated
\r\nduring switching operations in a Gas Insulated Substation (GIS) are
\r\nassociated with high frequency components in the order of few tens
\r\nof MHz.
\r\nThe frequency spectrum of the VFTO generated in the 220\/66 kV
\r\nWadi-Hoff GIS is analyzed using Fast Fourier Transform technique.
\r\nThe main frequency with high voltage amplitude due to the operation
\r\nof disconnector (DS5) is 5 to 10 MHz, with the highest amplitude at 9
\r\nMHz. The main frequency with high voltage amplitude due to the
\r\noperation of circuit breaker (CB5) is 1 to 25 MHz, with the highest
\r\namplitude at 2 MHz.
\r\nMitigating techniques damped the oscillating frequencies
\r\neffectively. The using of cable terminal reduced the frequency
\r\noscillation effectively than that of OHTL terminal. The using of a
\r\nshunt capacitance results in vanishing the high frequency
\r\ncomponents. Ferrite rings reduces the high frequency components
\r\neffectively especially in the range 2 to 7 MHz. The using of RC and
\r\nRL filters results in vanishing the high frequency components.<\/p>\r\n","references":"
[1] A. J. Martinez, "Statistics Assessment of Very Fast Transient\r\nOvervoltages in Gas Insulated Substations", IEEE Power Engineering\r\nSociety Summer Meeting 2000; 2: 882–883.\r\n[2] X. Dong, S. Rosado, Y. Liu, N. C. Wang, E. L. Line and T. Y. Guo,\r\n"Study of Abnormal Electrical Phenomena Effects on GSU\r\nTransformers", IEEE Transactions on Power Delivery July 2003; 18(3):\r\n835.\r\n[3] A. Said, Ebrahim A. Badran and M.A. Abd-Allah, “Mitigation of Very\r\nFast Transient Overvoltages at the More Sensitive Points in Gas\r\nInsulated Substation”. International Journal of Electrical and Power\r\nEngineering, 6(3): 118-123, 2012.\r\n[4] V. Vinod Kumar, M. Joy Thomas, and M. S. Naidu," Influence of\r\nSwitching Conditions on the VFTO Magnitudes in a GIS", IEEE\r\nTransaction on Power Delivary, VOL. 16, NO. 4, 2001.\r\n[5] M. Mohana Rao, M. Joy Thomas, and B. P. Singh," Electromagnetic\r\nField Emission From Gas-to-Air Bushing in a GIS During Switching\r\nOperations", IEEE Transactions on Eelectromagnetic Compatipility,\r\nVOL. 49, NO. 2, 2007.\r\n[6] M.Mohana Rao MJoy Thomas and B.P.Singh,’’ Frequency spectrum\r\nanalysis of fast transient currents (FTC) due to switching operations in a\r\n245 kV GIS ‘’, Asia Pacific. IEEE\/PES, Transmission and Distribution\r\nConference and Exhibition , 2239 – 2243, vol.3, 6-10 Oct. 2002.\r\n[7] Wan Yiru, Chen Guang and Zhou Hao,” Study on VFTO in UHV GIS\r\nSubstation” 4th International Conference on Electric Utility\r\nDeregulation and Restructuring and Power Technologies (DRPT), 2011.\r\n[8] Ahmad Tavakoli, Ahmad Gholami," Influence of Terminal Components\r\nfor Suppression of High-Frequency Transients in GIS", International\r\nPower and Energy Conference (IPEC 2010), Singapore, 27-29 Oct.\r\n2010.\r\n[9] Fan Li-ping and Liang Yu,” The Effect of Appartus Model on Very Fast\r\nTransient Over-voltage”, International Conference on Electric\r\nInformation and Control Engineering (ICEICE),15-17 April, 2011.\r\n[10] L. Qingmin and W Minglei, "Simulation Method for the Applications of\r\nFerromagnetic Materials in Suppressing High Frequency Transients\r\nWithin GIS". IEEE Transactions on Power Delivery July 2007; 22(3):\r\n1628.\r\n[11] Mariusz Stosur, Marcin Szewczyk, Wojciech Piasecki,Marek\r\nFlorkowski and Marek Fulczyk ," GIS Disconnector Switching\r\nOperation– VFTO Study", Modern Electric Power Systems 2010,\r\nMEPS'10 - paper 13.4, Wroclaw, Poland.\r\n[12] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, "Accurate\r\nModeling of Very Fast Transients Overvoltages in A 245kVGIS and\r\nResearch on Protection Measures", IEEE International conference on\r\nElectrical Insulation and Dielectric phenomena((CEIDP2010), West\r\nLafayette, USA.\r\n[13] Wang Zhuo, Wang Weiquan and Wang Qiang, "Research of\r\nSuppressing VFTO for 500kV GIS Substation Based on EMTP\/ATP",\r\nInternational Conference on E -Business and E -Government (ICEE), 6-\r\n8 May 2011.\r\n[14] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, " Time-Frequency\r\nAnalysis Of Very Fast Transient Over Voltages For Effective Shielding\r\nOf Control Circuits In A 245kv Gas Insulated Substation", International\r\nconference on High Voltage Engineering and Application (ICHVE), 11-\r\n14 Oct, 2010.<\/p>\r\n","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 79, 2013"}