Title :
Analysis of stator ground protection schemes for hydro-generator of Three-Gorges power plant based on zero sequence voltages
Author :
Tai, Nengling ; Yin, Xianggen ; Chen, Deshu
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
New mathematical models for the zero-sequence voltage of large hydro-generator on turn basis are used to study hydro-generator stator ground fault protection schemes in this paper. The evaluation and the comparison of the characteristics of some stator ground protection schemes are described by means of protection coverage-critical resistance curves. And the simulation results showed that those schemes would suffer low sensitivity when they are used to huge hydro-generators in Three-Gorges power plant. To overcome this disadvantage, new ground fault protection schemes with higher sensitivity based on fault components are developed in this paper
Keywords :
earthing; electrical faults; hydroelectric generators; hydroelectric power stations; machine protection; machine theory; stators; Three-Gorges hydropower plant; fault components; ground fault protection schemes; hydroelectric generator; mathematical models; protection coverage-critical resistance curves; sensitivity; simulation results; stator ground protection schemes; zero sequence voltages; Capacitance; Costs; Fault detection; Mathematical model; Power generation; Protection; Senior members; Stator windings; Testing; Voltage;
Conference_Titel :
Power Engineering Society Winter Meeting, 2000. IEEE
Print_ISBN :
0-7803-5935-6
DOI :
10.1109/PESW.2000.847641
