Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators

Authors

  • Byron Ruíz-Mondragón Universidad Tecnológica de Pereira
  • Juan Mora-Flórez Universidad Tecnológica de Pereira
  • Sandra Pérez-Londoño Universidad Tecnológica de Pereira

Keywords:

100 % stator ground fault protection, synchronous generator, third harmonic, phase-ground fault

Abstract


This paper shows a comparison and a proposed improvement of three different approaches based on the measurements of the third harmonic of voltage which are aimed to obtain a 100% protection of the stator winding in the case of ground faults in high resistance grounded synchronous generators. These three different methods are based in voltage measurements at the neutral and terminal connections, and also in the ratio of these measurements. From the results obtained in a real synchronous generator there are advantages of the scheme based on the ratio of the voltages measured at terminals and neutral, in the case of using the voltage threshold strategy. However, by using the proposed alarm-trip logic, remarkable improvements could be obtained in the case of detecting high impedance ground faults. Finally, this work may help to develop useful protective devices which detect ground faults at the synchronous generator stator windings. Although a first fault normally does not cause any problem, this have to be removed before the occurrence of a second ground fault which could cause severe machine damages and the consequent outage.
|Abstract
= 12 veces | PDF (ESPAÑOL (ESPAÑA))
= 10 veces|

Downloads

Download data is not yet available.

References

IEEE Standards Board. “IEEE Guide for AC generator protection”. Power System Relaying Committee of the IEEE Power Engineering Society. 1995. pp. 1-120.

IEEE C62-92. “Guide for the Application of Neutral Grounding in Electrical Utility Systems Part Il- Grounding of Synchronous Generator Systems” Power System Relaying Committee. 1989. pp. 7-18.

J. Blackburn. “Protective relaying - principles and application”. 2nd. ed. Ed. Marcell Dekker. New York. 1994. pp. 215-316.

D. Reimert. “Protective Relaying for Power Generation Systems”. Ed. CRC Press Taylor and Francis Group. Boca Raton, Florida, USA. 2006. pp. 132-155.

J. Mora Flórez, G. Olguín, L. Giraldo. “Evaluación de la protección del estator de un generador ante fallas a tierra usando el método de inyección subarmónica”. Rev. Ingeniería y Competitividad. Vol.10. 2008. pp. 21-30.

L. Giraldo, J. Mora Flórez, G. Olguín. “Análisis sensitividad del método de inyección subarmónica para la protección del 100% del estator del generador síncrono ante fallos fase tierra”. Revista Tecnura - U. Distrital. Vol. 20. 2007. pp. 52-60.

R. Alcántara, F. García. “100% Stator ground fault protection a comparison of two protection methods”. Department of Industrial Electrical Engineering and Automation. Lund Institute of Technology. MSc. Thesis. 2005. pp. 20-46.

J. Pope. “A comparison of 100% stator ground fault protection schemes for generator stator windings”. IEEE Trans on Power Apparatus and Systems. Vol. 103. 1984. pp. 832–840.

M. Fulczyk. “Zero-sequence voltages in unit-connected generator for different methods of grounding generator neutral”. ABB Corporate Research. Krakow. Poland Developments in Power System Protection. Conference Publication N.º.479 0 IEE. 2001. pp. 499-502.

T Nenglin, Y. XiangGen, C. DeShu. “Analysis of stator ground protection schemes for hydro-generator of three gorges power plant based on zero sequence voltages”. IEEE Power Engineering Society Winter Meeting. Singapore. Vol. 3. 2000. pp. 1888-1893.

W. Weijian, X. Xiaoping, Z. Xiling. “New Development of third harmonic ground fault protection schemes for turbine-generator stator windings”. Tsinghua University. Xuchang Relay Institute. 2003. pp. 250-253.

S. Shiwen, S. Binhua. “Analysis of ground protection of unit connected generators using third harmonics”. Fourth International Conference on Developments in Power Protection. UK. 1989. pp. 254-258.

D. Johnson, J. Hilburn, J. Johnson. “Electric Circuit Analysis”. Ed. John Wiley and Sons.Inc. New York. 1997. pp. 25-102.

Published

2013-03-07

How to Cite

Ruíz-Mondragón, B., Mora-Flórez, J., & Pérez-Londoño, S. (2013). Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators. Revista Facultad De Ingeniería Universidad De Antioquia, (52), 215–225. Retrieved from https://revistas.udea.edu.co/index.php/ingenieria/article/view/14818