High-Frequency Spectrum Analysis of VFTO Generated inside Gas Insulated Substations
Worldwide many electrical equipment insulation
failures have been reported caused by switching operations, while
those equipments had previously passed all the standard tests and
complied with all quality requirements. The problem is mostly
associated with high-frequency overvoltages generated during
opening or closing of a switching device. The transients generated
during switching operations in a Gas Insulated Substation (GIS) are
associated with high frequency components in the order of few tens
of MHz.
The frequency spectrum of the VFTO generated in the 220/66 kV
Wadi-Hoff GIS is analyzed using Fast Fourier Transform technique.
The main frequency with high voltage amplitude due to the operation
of disconnector (DS5) is 5 to 10 MHz, with the highest amplitude at 9
MHz. The main frequency with high voltage amplitude due to the
operation of circuit breaker (CB5) is 1 to 25 MHz, with the highest
amplitude at 2 MHz.
Mitigating techniques damped the oscillating frequencies
effectively. The using of cable terminal reduced the frequency
oscillation effectively than that of OHTL terminal. The using of a
shunt capacitance results in vanishing the high frequency
components. Ferrite rings reduces the high frequency components
effectively especially in the range 2 to 7 MHz. The using of RC and
RL filters results in vanishing the high frequency components.
<p>[1] A. J. Martinez, "Statistics Assessment of Very Fast Transient
Overvoltages in Gas Insulated Substations", IEEE Power Engineering
Society Summer Meeting 2000; 2: 882–883.
[2] X. Dong, S. Rosado, Y. Liu, N. C. Wang, E. L. Line and T. Y. Guo,
"Study of Abnormal Electrical Phenomena Effects on GSU
Transformers", IEEE Transactions on Power Delivery July 2003; 18(3):
835.
[3] A. Said, Ebrahim A. Badran and M.A. Abd-Allah, “Mitigation of Very
Fast Transient Overvoltages at the More Sensitive Points in Gas
Insulated Substation”. International Journal of Electrical and Power
Engineering, 6(3): 118-123, 2012.
[4] V. Vinod Kumar, M. Joy Thomas, and M. S. Naidu," Influence of
Switching Conditions on the VFTO Magnitudes in a GIS", IEEE
Transaction on Power Delivary, VOL. 16, NO. 4, 2001.
[5] M. Mohana Rao, M. Joy Thomas, and B. P. Singh," Electromagnetic
Field Emission From Gas-to-Air Bushing in a GIS During Switching
Operations", IEEE Transactions on Eelectromagnetic Compatipility,
VOL. 49, NO. 2, 2007.
[6] M.Mohana Rao MJoy Thomas and B.P.Singh,’’ Frequency spectrum
analysis of fast transient currents (FTC) due to switching operations in a
245 kV GIS ‘’, Asia Pacific. IEEE/PES, Transmission and Distribution
Conference and Exhibition , 2239 – 2243, vol.3, 6-10 Oct. 2002.
[7] Wan Yiru, Chen Guang and Zhou Hao,” Study on VFTO in UHV GIS
Substation” 4th International Conference on Electric Utility
Deregulation and Restructuring and Power Technologies (DRPT), 2011.
[8] Ahmad Tavakoli, Ahmad Gholami," Influence of Terminal Components
for Suppression of High-Frequency Transients in GIS", International
Power and Energy Conference (IPEC 2010), Singapore, 27-29 Oct.
2010.
[9] Fan Li-ping and Liang Yu,” The Effect of Appartus Model on Very Fast
Transient Over-voltage”, International Conference on Electric
Information and Control Engineering (ICEICE),15-17 April, 2011.
[10] L. Qingmin and W Minglei, "Simulation Method for the Applications of
Ferromagnetic Materials in Suppressing High Frequency Transients
Within GIS". IEEE Transactions on Power Delivery July 2007; 22(3):
1628.
[11] Mariusz Stosur, Marcin Szewczyk, Wojciech Piasecki,Marek
Florkowski and Marek Fulczyk ," GIS Disconnector Switching
Operation– VFTO Study", Modern Electric Power Systems 2010,
MEPS'10 - paper 13.4, Wroclaw, Poland.
[12] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, "Accurate
Modeling of Very Fast Transients Overvoltages in A 245kVGIS and
Research on Protection Measures", IEEE International conference on
Electrical Insulation and Dielectric phenomena((CEIDP2010), West
Lafayette, USA.
[13] Wang Zhuo, Wang Weiquan and Wang Qiang, "Research of
Suppressing VFTO for 500kV GIS Substation Based on EMTP/ATP",
International Conference on E -Business and E -Government (ICEE), 6-
8 May 2011.
[14] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, " Time-Frequency
Analysis Of Very Fast Transient Over Voltages For Effective Shielding
Of Control Circuits In A 245kv Gas Insulated Substation", International
conference on High Voltage Engineering and Application (ICHVE), 11-
14 Oct, 2010.</p>
<p>[1] A. J. Martinez, "Statistics Assessment of Very Fast Transient
Overvoltages in Gas Insulated Substations", IEEE Power Engineering
Society Summer Meeting 2000; 2: 882–883.
[2] X. Dong, S. Rosado, Y. Liu, N. C. Wang, E. L. Line and T. Y. Guo,
"Study of Abnormal Electrical Phenomena Effects on GSU
Transformers", IEEE Transactions on Power Delivery July 2003; 18(3):
835.
[3] A. Said, Ebrahim A. Badran and M.A. Abd-Allah, “Mitigation of Very
Fast Transient Overvoltages at the More Sensitive Points in Gas
Insulated Substation”. International Journal of Electrical and Power
Engineering, 6(3): 118-123, 2012.
[4] V. Vinod Kumar, M. Joy Thomas, and M. S. Naidu," Influence of
Switching Conditions on the VFTO Magnitudes in a GIS", IEEE
Transaction on Power Delivary, VOL. 16, NO. 4, 2001.
[5] M. Mohana Rao, M. Joy Thomas, and B. P. Singh," Electromagnetic
Field Emission From Gas-to-Air Bushing in a GIS During Switching
Operations", IEEE Transactions on Eelectromagnetic Compatipility,
VOL. 49, NO. 2, 2007.
[6] M.Mohana Rao MJoy Thomas and B.P.Singh,’’ Frequency spectrum
analysis of fast transient currents (FTC) due to switching operations in a
245 kV GIS ‘’, Asia Pacific. IEEE/PES, Transmission and Distribution
Conference and Exhibition , 2239 – 2243, vol.3, 6-10 Oct. 2002.
[7] Wan Yiru, Chen Guang and Zhou Hao,” Study on VFTO in UHV GIS
Substation” 4th International Conference on Electric Utility
Deregulation and Restructuring and Power Technologies (DRPT), 2011.
[8] Ahmad Tavakoli, Ahmad Gholami," Influence of Terminal Components
for Suppression of High-Frequency Transients in GIS", International
Power and Energy Conference (IPEC 2010), Singapore, 27-29 Oct.
2010.
[9] Fan Li-ping and Liang Yu,” The Effect of Appartus Model on Very Fast
Transient Over-voltage”, International Conference on Electric
Information and Control Engineering (ICEICE),15-17 April, 2011.
[10] L. Qingmin and W Minglei, "Simulation Method for the Applications of
Ferromagnetic Materials in Suppressing High Frequency Transients
Within GIS". IEEE Transactions on Power Delivery July 2007; 22(3):
1628.
[11] Mariusz Stosur, Marcin Szewczyk, Wojciech Piasecki,Marek
Florkowski and Marek Fulczyk ," GIS Disconnector Switching
Operation– VFTO Study", Modern Electric Power Systems 2010,
MEPS'10 - paper 13.4, Wroclaw, Poland.
[12] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, "Accurate
Modeling of Very Fast Transients Overvoltages in A 245kVGIS and
Research on Protection Measures", IEEE International conference on
Electrical Insulation and Dielectric phenomena((CEIDP2010), West
Lafayette, USA.
[13] Wang Zhuo, Wang Weiquan and Wang Qiang, "Research of
Suppressing VFTO for 500kV GIS Substation Based on EMTP/ATP",
International Conference on E -Business and E -Government (ICEE), 6-
8 May 2011.
[14] J. V. G. Rama Rao, J. Amarnath and S. Kamakshaiah, " Time-Frequency
Analysis Of Very Fast Transient Over Voltages For Effective Shielding
Of Control Circuits In A 245kv Gas Insulated Substation", International
conference on High Voltage Engineering and Application (ICHVE), 11-
14 Oct, 2010.</p>
@article{"International Journal of Electrical, Electronic and Communication Sciences:52989", author = "M. A. Abd-Allah and A. Said and Ebrahim A. Badran", title = "High-Frequency Spectrum Analysis of VFTO Generated inside Gas Insulated Substations", abstract = "Worldwide many electrical equipment insulation
failures have been reported caused by switching operations, while
those equipments had previously passed all the standard tests and
complied with all quality requirements. The problem is mostly
associated with high-frequency overvoltages generated during
opening or closing of a switching device. The transients generated
during switching operations in a Gas Insulated Substation (GIS) are
associated with high frequency components in the order of few tens
of MHz.
The frequency spectrum of the VFTO generated in the 220/66 kV
Wadi-Hoff GIS is analyzed using Fast Fourier Transform technique.
The main frequency with high voltage amplitude due to the operation
of disconnector (DS5) is 5 to 10 MHz, with the highest amplitude at 9
MHz. The main frequency with high voltage amplitude due to the
operation of circuit breaker (CB5) is 1 to 25 MHz, with the highest
amplitude at 2 MHz.
Mitigating techniques damped the oscillating frequencies
effectively. The using of cable terminal reduced the frequency
oscillation effectively than that of OHTL terminal. The using of a
shunt capacitance results in vanishing the high frequency
components. Ferrite rings reduces the high frequency components
effectively especially in the range 2 to 7 MHz. The using of RC and
RL filters results in vanishing the high frequency components.
", keywords = "GIS, VFTO, Mitigation Techniques, Frequency
spectrum, FFT, EMTP/ATP.", volume = "7", number = "7", pages = "822-8", }
