DocumentCode :
1156299
Title :
Analysis of operating conditions of ground-fault protection schemes for generator stator winding
Author :
Zielichowski, Mieczyslaw ; Fulczyk, Marek
Author_Institution :
Inst. of Electr. Power Eng., Wroclaw Univ. of Technol., Poland
Volume :
18
Issue :
1
fYear :
2003
fDate :
3/1/2003 12:00:00 AM
Firstpage :
57
Lastpage :
62
Abstract :
This paper presents results of simulation studies of the influence of methods of grounding the stator winding of the unit-connected generator neutral on the operating conditions of a 100-percent ground-fault protection excited by the third-harmonic voltage ratio in the generator neutral and at its terminals. The analysis was performed for a generator with the neutral grounded through a ground-fault neutralizer, a third-harmonic stop filter, a resistor, and a capacitive voltage divider. The influence of the parameters of the particular elements of the grounding circuits on the voltage-feeding measuring element of the protection was determined. The capacitance to ground of the generator breakers was taken into account. The simulations were run for 1110-MVA unit-connected generator at ground faults along the whole length of the generator stator winding. It has been found that the method of grounding the generator neutral and the parameter of the grounding elements significantly influences the operating conditions of this protection. It is shown that through the proper selection of these parameters, the ground-fault protection of whole stator winding, counting from the generator neutral to the terminals is ensured.
Keywords :
AC generators; earthing; machine protection; stators; 1110 MVA; 24 kV; 26.7 kA; capacitance to ground; capacitive voltage divider; fault location; generator breakers; generator neutral; generator stator winding; ground-fault neutralizer; ground-fault protection schemes; operating conditions; resistor; stator winding grounding; third-harmonic stop filter; third-harmonic voltage ratio; unit-connected generator; voltage-feeding measuring element; Capacitance; Circuits; Filters; Grounding; Particle measurements; Performance analysis; Protection; Resistors; Stator windings; Voltage;
fLanguage :
English
Journal_Title :
Energy Conversion, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8969
Type :
jour
DOI :
10.1109/TEC.2002.808382
Filename :
1183713
Link To Document :
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