Title :
A Microprocessor Based Three-Phase Transformer Differential Relay
Author :
Thorp, J.S. ; Phadke, A.G.
Author_Institution :
Cornell University
Abstract :
This paper presents an algorithm for digital protection of a three-phase, three-winding power transformer. Simple recursive expressions are given for the harmonics using a sampling rate of 12 times a cycle. These expressions are used as the basis for a one cycle algorithm which is compatible with proposed digital line protection schemes. The algorithm was tested on data obtained from a model transformer. Test results are given for 19 cases of energizations and faults.
Keywords :
Circuit faults; Current transformers; Microprocessors; Phase transformers; Power system protection; Power transformers; Protective relaying; Relays; Substations; Surge protection;
Journal_Title :
Power Apparatus and Systems, IEEE Transactions on
DOI :
10.1109/TPAS.1982.317124
