Title :
A new field ground fault protection with low frequency voltage injection
Author :
Zhang, Kanjun ; Yin, Xianggen ; Ren, Yan ; Chen, Deshu ; Zhang, Zhe ; Mao, Jian
Author_Institution :
Huazhong Univ. of Sci. & Technol., Wuhan
Abstract :
In the paper, a new field ground fault protection with voltage injection is introduced. The injection voltage of protection is a low frequency square wave voltage, it is transformed from an AC voltage by transformer, rectifier and electronic switches, and its frequency is controllable. The principle, criterion and hardware configuration of protection are given, and several operation problems are analyzed. The results of static simulation test and dynamic simulation test is shown, the operational aspect of protection in three gorges left bank power plant is also introduced, these test and operation results indicate that the protection performance can meet the practical operation requirement, so the application prospect of this protection is good.
Keywords :
power generation faults; power generation protection; power plants; power transformers; rectifying circuits; dynamic simulation test; electronic switches; field ground fault protection; low-frequency square wave voltage injection; power plant; rectifier; static simulation test; transformer; Circuit faults; Circuit testing; Frequency; Hardware; Low voltage; Power transformer insulation; Protection; Rectifiers; Signal generators; Switches; Accuracy; Field circuit ground fault; Low frequency voltage injection; Sensitivity;
Conference_Titel :
Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International
Conference_Location :
Brighton
Print_ISBN :
978-1-905593-36-1
Electronic_ISBN :
978-1-905593-34-7
DOI :
10.1109/UPEC.2007.4468957
