SciELO - Scientific Electronic Library Online

 
 issue52Current control schemes for three-phase fourwire shunt active power filters: a comparative studyThe negative sequence impedance as fault indicator in induction motors author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista Facultad de Ingeniería Universidad de Antioquia

Print version ISSN 0120-6230
On-line version ISSN 2357-53280

Abstract

RUIZ-MONDRAGON, Byron; MORA-FLOREZ, Juan  and  PEREZ-LONDONO, Sandra. Improvement of the third harmonic based stator ground fault protection for high resistance grounded synchronous generators. Rev.fac.ing.univ. Antioquia [online]. 2010, n.52, pp.215-225. ISSN 0120-6230.

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.

Keywords : 100 % stator ground fault protection; synchronous generator; third harmonic; phase-ground fault.

        · abstract in Spanish     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License