Improved Overcurrent Protection Using Symmetrical Components

Transient currents are quite common in power systems. They can be presented for both faults and switching events. In the case of switching events, such transients should not cause an overcurrent relay operation; therefore a dependable and secure relay response becomes a critical matter. Meanwhile, p...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2007-04, Vol.22 (2), p.843-850
Main Authors: Lotfi-fard, S., Faiz, J., Iravani, R.
Format: Article
Language:English
Subjects:
Applied sciences
Computer programs
Connection and protection apparatus
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Fault
Faults
Induction motors
Miscellaneous
Overcurrent
overcurrent relay
Power networks and lines
Power system faults
Power system harmonics
Power system protection
Power system relaying
Power system simulation
Power system transients
Protective relaying
PSCAD
Relay
Software
Software algorithms
Switching
symmetrical components
Theory. Simulation
Transformers and inductors
Transient current
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Summary:Transient currents are quite common in power systems. They can be presented for both faults and switching events. In the case of switching events, such transients should not cause an overcurrent relay operation; therefore a dependable and secure relay response becomes a critical matter. Meanwhile, proper techniques must be used to prevent undesirable relay operations due to transient current and harmonics of current in the power system. This paper uses the concept of symmetrical components to discriminate fault from nonfault events. For this purpose, a criterion function is proposed using the above-mentioned components. The advantage of the proposed algorithm is shown by simulation of some typical transient currents due to transformer energizing and induction motor starting using EMTDC/PSCAD software
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2007.893591