Page 513 - Decision Making Applications in Modern Power Systems

Chapter 18

A reliable decision-making

algorithm for fault during power
swing in 400 kV double-circuit

transmission line: a case study
of Chhattisgarh state power

system network

3
1
1
2
V. Ashok , Anamika Yadav , C.C. Anthony , K.K. Yadav and
Umakant Yadav 4
1
Department of Electrical Engineering, National Institute of Technology, Raipur, India,
2
Transmission, Chhattisgarh State Power Transmission Company Ltd., Raipur, India,
3
Meter, Relay and Testing Division, 400 kV Sub-Station, Bhilai-3, Chhattisgarh State Power
4
Transmission Company Ltd., Bhilai, India, Extra High Tension: Construction and Maintenance
Division, Gudhiyari, Chhattisgarh State Power Transmission Company Ltd., Raipur, India
18.1 Introduction
Generally, the power swing (PS) is defined as oscillation in the power angle
of the two area that occurs owing to abrupt change in system configuration
such as removal of faulted line due to clearance of fault by opening of circuit
breakers, loss of synchronism, or changes in direction of power flow because
of switching-in/out of various equipment/elements [1]. PS can be character-
ized into two types such as stable PS or unstable PS. In case of a stable PS
the power oscillations will die down after some time, whereas in case of
unstable PS, there is progressive parting of power angle between the two
areas causing large oscillations in both active and reactive power flows, vol-
tages, and currents, thereby leading to loss of synchronism of generators in
the system [2,3]. The reports of the blackouts in India endorse the decisive
role played by protection relays [4 6]. The recent blackout in India during
July 30 and 31, 2012 was originated by the tripping of zone-3 distance relay

Decision Making Applications in Modern Power Systems. DOI: https://doi.org/10.1016/B978-0-12-816445-7.00018-9
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