Title :
A New Novel Differential Protection Scheme for a High-Voltage, Cable-Wound Generator
Author :
Tian, Qing ; Lin, Xiangning
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
Abstract :
This paper presents a novel differential protection of powerformer, a type of high-voltage graded insulated cable wound generator. The false differential current associated with the distributed capacitance of powerformer stator windings is analyzed. Based on the investigation results, the winding capacitance can be equivalently arranged on the terminal and neutral of the generator respectively in a reasonable partition. And the phase voltages at the terminals are utilized to estimate the capacitive currents, which can be compensated to improve the sensitivity of the differential protection. Extensive simulation results prove that this compensation scheme can improve the reliability of the current differential protection of powerformer
Keywords :
machine insulation; synchronous generators; AC synchronous generators; capacitive currents; compensation scheme; differential protection scheme; distributed capacitance; high-voltage graded insulated cable wound generator; powerformer stator windings; Cable insulation; Capacitance; Power cable insulation; Power cables; Power generation; Power transformer insulation; Power transmission lines; Protection; Stator windings; Voltage; cable capacitance; graded insulation; powerformer; self-adaptative compensated;
Conference_Titel :
Transmission & Distribution Conference and Exposition: Latin America, 2006. TDC '06. IEEE/PES
Conference_Location :
Caracas
Print_ISBN :
1-4244-0287-5
Electronic_ISBN :
1-4244-0288-3
DOI :
10.1109/TDCLA.2006.311625
