A novel 20Hz power injection protection scheme for stator ground fault of pumped storage generator

Author

Zhu, Zheng ; Lu, Yuping

Author_Institution

Sch. of Electr. Eng., Southeast Univ., Nanjing

fYear

2008

fDate

6-9 April 2008

Firstpage

1911

Lastpage

1915

Abstract

Based on the analysis of the start-up of pumped storage generator under motor circumstance, it is found out that the conventional 20 Hz injection component is influenced by the low frequency component when ground faults take place in the stator windings for static frequency converter (SFC) start-up generator. The conventional relay is just simply blocked in case mal-operation during 20 Hz working condition. To overcome the disadvantage, a novel scheme is proposed to improve grounding- resistance(R) calculation accuracy and enhance ability to limit impact of 20 Hz component from generator. The simulation results proved its effectiveness and practicability of the scheme.

Keywords

earthing; frequency convertors; hydroelectric generators; pumped-storage power stations; power injection protection scheme; pumped storage generator; static frequency converter; stator ground fault; stator windings; Circuit faults; Frequency conversion; Induction generators; Induction motors; Power generation; Protection; Rotors; Stator windings; Synchronous motors; Voltage; Grounding; injection voltage source; protection; pumped storage; windings;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on

Conference_Location

Nanjuing

Print_ISBN

978-7-900714-13-8

Electronic_ISBN

978-7-900714-13-8

Type

conf

DOI

10.1109/DRPT.2008.4523719

Filename

4523719