Title :
A Novel Current Differential Protection Scheme for Powerformer
Author :
Tian, Qing ; Lin, Xiangning ; Lu, Wenjun
Author_Institution :
Coll. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
Abstract :
This paper presents a novel differential protection of power former, a type of high-voltage graded insulated cable wound generator. The false differential current associated with the distributed capacitance of power former 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 power former.
Keywords :
power transformer protection; stators; synchronous generators; AC synchronous generators; capacitive current estimation; current differential protection reliability; distributed capacitance; false differential current; high-voltage graded insulated cable wound generator; powerformer stator winding; winding capacitance; Cable insulation; Capacitance; Power cable insulation; Power cables; Power generation; Power system protection; Power transformer insulation; Power transmission lines; Stator windings; Voltage; cable capacitance; graded insulation; powerformer; self-adaptive compensated;
Conference_Titel :
Power System Technology, 2006. PowerCon 2006. International Conference on
Conference_Location :
Chongqing
Print_ISBN :
1-4244-0110-0
Electronic_ISBN :
1-4244-0111-9
DOI :
10.1109/ICPST.2006.321478
