DocumentCode :
2806624
Title :
A practical look at harmonics in power transformer differential protection
Author :
Madzikanda, E. ; Negnevitsky, Michael
Author_Institution :
Transend Networks Pty Ltd., Lenah Valley, TAS, Australia
fYear :
2012
fDate :
Oct. 30 2012-Nov. 2 2012
Firstpage :
1
Lastpage :
6
Abstract :
Differential protection of transformers traditionally uses second and/or fifth harmonics to block its operation during inrush conditions. The second and/or fifth harmonics produced during fault condition, when a protection system is required to operate, have in some cases blocked or delayed operation of transformer differential protection. The problem is to distinguish fault and inrush situations and allow the protection system to operate when there is fault, and to block it during inrush conditions. In order to achieve this, we propose to measure the rate of change of the third harmonic as an additional indicator of the fault condition. If the rate of change of the third harmonic exceeds some predefined threshold and the second and/or fifth harmonic are detected, the protection system will be allowed to operate, otherwise it is blocked.
Keywords :
fault diagnosis; power transformer protection; fault condition; fifth harmonics; inrush conditions; power transformer differential protection; protection system; second harmonics; third harmonic; Harmonic analysis; Indexes; MATLAB; Relays; Saturation magnetization; Surge protection; Surges; Current Transformer saturation; Harmonic restraint/blocking; Inrush; Symmetrical components;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power System Technology (POWERCON), 2012 IEEE International Conference on
Conference_Location :
Auckland
Print_ISBN :
978-1-4673-2868-5
Type :
conf
DOI :
10.1109/PowerCon.2012.6401274
Filename :
6401274
Link To Document :
بازگشت