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Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification

Received: 10 November 2014     Accepted: 13 November 2014     Published: 19 November 2014
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Abstract

Providing an affordable and reliable electricity supply to rural communities is seen by countries round the world as one of the major keys to development. A good quality and stable electricity supply can provide a wide variety of benefits including lighting (allowing evening activities), clean cooking and heating, access to television/radio, telephone (including mobile), improved health (due to example refrigeration), and many small industrial uses. Often this can be provided by extending the main electricity network to the community. However, for remote rural areas the costs involved can be very high. Therefore, Un-conventional Rural Electrification (URE) technologies are thus very relevant, particularly for countries in sub-Saharan Africa (SSA), as they have potential to make connection to the electricity network affordable. While such systems are already in use, their penetration level is very low. Hence, if the penetration level of such system in power network increases, what is the effect on power and voltage quality, stability and capacity constraints of the overall system? What are the limiting factors, and how can this limit be determined for any particular rural electrification project. These are some of the major questions that this paper address progressively. The paper investigated the maximum penetration level of sub-station based Auxiliary Service Voltage Transformer (ASVT) technologies in transmission power networks with regard to voltage quality, stability, and capacity constraints. This was done by comparing the simulation results of ASVT(s) penetration on a transmission power network with the constructed Surge Impedance Loading (SIL) curves. The curves were derived from the ABCD parameters of the transmission line under investigation. Results showed that ASVT sub-station technologies can be applicable to any HV transmission line whose voltage level is within the 6% tolerance when the load power factor is varied between 0.2 and unity power factor. Moreover, the Loadability tests carried out showed that ASVT system could be operated within allowable voltage profile, if 1MW at 0.3 to 0.5 power factor lagging load was connected.

Published in International Journal of Energy and Power Engineering (Volume 4, Issue 2-1)

This article belongs to the Special Issue Electrical Power Systems Operation and Planning

DOI 10.11648/j.ijepe.s.2015040201.11
Page(s) 1-11
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Auxiliary Service Voltage Transformers (ASVTs), Maximum Penetration Level, Sub-Saharan Africa, Loadability Test, ABCD Parameters, Surge Impedance Loading

References
[1] Pasand, M.S., Aghazadeh, R., (2003).Capacitive Voltage Substations Ferro resonance Prevention using power electronicsdevices International conference on power system transients- IPST 2003 in New Orleans.
[2] Gomez, R.G., Solano, A.S., Acosta, E.A., (2010): Rural Electrification Project Development, Using Auxilliary Transformers. Location of Tubares, Chihuahua, Mexico. CIGRE C6-305- 2010 working group (Coll 2010) “Rural Electrification” Calgary.
[3] Arteche Instrument transformer manual (2010): ASVT – 245 and ASVT 145 Manuals and technical brochures.
[4] Saulo, M.J., Gaunt C.T., and Mbogho, M.S., (2012): Comparative Assessment of Capacitor Coupling Sub-station and Auxiliary Service Voltage Transformer for Rural Electrification 2nd annual Kabarak international conference at Kabarak University 16th -18th October 2012 Nakuru, Kenya.
[5] Barnes, D.F., (2007): The challenge of Rural Electrification: Strategies for developing countries. Vol 3 pp1-18 Washington DC.
[6] Wilson, R. E., Zevenbergen G. A., Mah, D.L., Murphy, A. J., (1999): Calculation of transmission line parameters from synchronised measurements Taylor and Francis,Vol 27, pp1269-1278, 1999.
[7] Bell, S.C., Bodgers P.S., (2007) Power Transformer Design Using Magnetic Theory Finite Element Analysis-Comparison of Techniques Proceeding of AUPEC 2007 Perth, Western Australia 9-12 December 2007.
[8] Grainger J.J., and Stevenson W.D., (1994): Power System Analysis, Singapore: McGraw Hill 1994, pp 141-233.
[9] Margueron, X., Keradec, J.P., (2007): Design of equivalent circuit and characterization strategy of n-input coupled inductors. IEEE Transactions on Industry Applications Jan- Feb 2007, vol 43, Issue 1, pp14-22
[10] McLyman, W.N., (2004): TransformerInductor and Design Handbook, 3rd edition, 2004.Dekker, New York, USA,
[11] Paul, C.R., Nasar, S. A., Unnewehr, L.E., (1986): Introduction to Electrical Engineering McGraw-Hill, Singapore, 1986.
[12] Wadhwa,High Power system analysis and applications, The Electricity Authority of New South Wales, Fourth Edition, June 2010.
[13] Anderson, G.O., Yanev, K., (2010): Non-Conventional Sub-station and Distribution System for Rural Electrification. 3rd IASTED Africa PES 2010, Gaborone, Botswana, September 2010.
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  • APA Style

    Michael Juma Saulo, Charles Trevor Gaunt. (2014). Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification. International Journal of Energy and Power Engineering, 4(2-1), 1-11. https://doi.org/10.11648/j.ijepe.s.2015040201.11

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    ACS Style

    Michael Juma Saulo; Charles Trevor Gaunt. Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification. Int. J. Energy Power Eng. 2014, 4(2-1), 1-11. doi: 10.11648/j.ijepe.s.2015040201.11

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    AMA Style

    Michael Juma Saulo, Charles Trevor Gaunt. Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification. Int J Energy Power Eng. 2014;4(2-1):1-11. doi: 10.11648/j.ijepe.s.2015040201.11

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  • @article{10.11648/j.ijepe.s.2015040201.11,
      author = {Michael Juma Saulo and Charles Trevor Gaunt},
      title = {Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification},
      journal = {International Journal of Energy and Power Engineering},
      volume = {4},
      number = {2-1},
      pages = {1-11},
      doi = {10.11648/j.ijepe.s.2015040201.11},
      url = {https://doi.org/10.11648/j.ijepe.s.2015040201.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.s.2015040201.11},
      abstract = {Providing an affordable and reliable electricity supply to rural communities is seen by countries round the world as one of the major keys to development. A good quality and stable electricity supply can provide a wide variety of benefits including lighting (allowing evening activities), clean cooking and heating, access to television/radio, telephone (including mobile), improved health (due to example refrigeration), and many small industrial uses. Often this can be provided by extending the main electricity network to the community. However, for remote rural areas the costs involved can be very high. Therefore, Un-conventional Rural Electrification (URE) technologies are thus very relevant, particularly for countries in sub-Saharan Africa (SSA), as they have potential to make connection to the electricity network affordable. While such systems are already in use, their penetration level is very low. Hence, if the penetration level of such system in power network increases, what is the effect on power and voltage quality, stability and capacity constraints of the overall system? What are the limiting factors, and how can this limit be determined for any particular rural electrification project. These are some of the major questions that this paper address progressively. The paper investigated the maximum penetration level of sub-station based Auxiliary Service Voltage Transformer (ASVT) technologies in transmission power networks with regard to voltage quality, stability, and capacity constraints. This was done by comparing the simulation results of ASVT(s) penetration on a transmission power network with the constructed Surge Impedance Loading (SIL) curves. The curves were derived from the ABCD parameters of the transmission line under investigation. Results showed that ASVT sub-station technologies can be applicable to any HV transmission line whose voltage level is within the 6% tolerance when the load power factor is varied between 0.2 and unity power factor. Moreover, the Loadability tests carried out showed that ASVT system could be operated within allowable voltage profile, if 1MW at 0.3 to 0.5 power factor lagging load was connected.},
     year = {2014}
    }
    

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  • TY  - JOUR
    T1  - Implication of Using Auxiliary Service Voltage Transformer Sub-Stations for Rural Electrification
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    DO  - 10.11648/j.ijepe.s.2015040201.11
    T2  - International Journal of Energy and Power Engineering
    JF  - International Journal of Energy and Power Engineering
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    AB  - Providing an affordable and reliable electricity supply to rural communities is seen by countries round the world as one of the major keys to development. A good quality and stable electricity supply can provide a wide variety of benefits including lighting (allowing evening activities), clean cooking and heating, access to television/radio, telephone (including mobile), improved health (due to example refrigeration), and many small industrial uses. Often this can be provided by extending the main electricity network to the community. However, for remote rural areas the costs involved can be very high. Therefore, Un-conventional Rural Electrification (URE) technologies are thus very relevant, particularly for countries in sub-Saharan Africa (SSA), as they have potential to make connection to the electricity network affordable. While such systems are already in use, their penetration level is very low. Hence, if the penetration level of such system in power network increases, what is the effect on power and voltage quality, stability and capacity constraints of the overall system? What are the limiting factors, and how can this limit be determined for any particular rural electrification project. These are some of the major questions that this paper address progressively. The paper investigated the maximum penetration level of sub-station based Auxiliary Service Voltage Transformer (ASVT) technologies in transmission power networks with regard to voltage quality, stability, and capacity constraints. This was done by comparing the simulation results of ASVT(s) penetration on a transmission power network with the constructed Surge Impedance Loading (SIL) curves. The curves were derived from the ABCD parameters of the transmission line under investigation. Results showed that ASVT sub-station technologies can be applicable to any HV transmission line whose voltage level is within the 6% tolerance when the load power factor is varied between 0.2 and unity power factor. Moreover, the Loadability tests carried out showed that ASVT system could be operated within allowable voltage profile, if 1MW at 0.3 to 0.5 power factor lagging load was connected.
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Author Information
  • Electrical Department. Technical University of Mombasa, Mombasa, Kenya

  • Electrical Department. University of Cape Town, Cape Town, South Africa

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