DocumentCode :
3795906
Title :
Integrated digital power transformer protection
Author :
B. Grcar;D. Dolinar
Author_Institution :
Fac. of Tech. Sci., Maribor, Slovenia
Volume :
141
Issue :
4
fYear :
1994
fDate :
7/1/1994 12:00:00 AM
Firstpage :
323
Lastpage :
328
Abstract :
In the paper the hardware and software prototype realisation of the integrated digital three-phase power transformer protection for selective operation with all kinds of short circuits, ground faults and turn-to-turn faults is presented. The proposed integrated protection concept was developed on the basis of a nonlinear mathematical transformer model which includes nonlinear effects of saturation, hysteresis and eddy currents. The protection algorithm includes a percentage differential relay with harmonic restraint at inrush and overexcitation conditions, an overcurrent relay with instantaneous and time-lag operation, a sensitive relay for selective operation at high-impedance ground faults and a fault recorder. The protection algorithm was implemented on powerful signal processor. Presented are the results of real-time laboratory and field testing which include the comparison of the standard static protection performance with the proposed digital one in relation to speed and accuracy.
Keywords :
"Digital control","Overcurrent protection","Power transformers","Protective relaying","Transformers","Protection"
Journal_Title :
IEE Proceedings - Generation, Transmission and Distribution
Publisher :
iet
ISSN :
1350-2360
Type :
jour
DOI :
10.1049/ip-gtd:19949987
Filename :
296510
Link To Document :
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