NDLI: Adaptive α-plane line differential protection

Content Provider	IET Digital Library
Author	Sarangi, Saumendra Pradhan, Ashok Kumar
Abstract	Alpha plane (α-plane)-based differential relay protecting a transmission line uses the ratio of the current phasors of both ends and has numerous advantages. Such an approach either uses phase or sequence components of currents. For a normal operating condition and external fault, the ratio remains within restraining region in the α-plane. During high resistance internal fault, the computed ratio at times lies inside the restraining region resulting misoperation of the technique. The scheme which uses sequence components of the currents has limited performance for single pole tripping and line impedance unbalance conditions. In this study, two features: phase angle between voltage and current and magnitude of change in currents of both ends of the line supplement the relay in identifying an internal fault. This improves the performance of phase current-based α-plane relay. The proposed method is tested for Western Electricity Coordinating Council (WSCC) 9-bus and two source equivalent system and results for various cases show improved performance.
Starting Page	2468
Ending Page	2477
Page Count	10
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 10, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.0943
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-03-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Α-plane Line Differential Relay Protection Current Phasor Ratio Current Sequence Component External Fault High Resistance Internal Fault Line Impedance Unbalance Condition Phase Angle Phase Current-based Α-plane Relay Performance Power System Protection Power Transmission Fault Power Transmission Line Power Transmission Protection Power Transmission, Distribution And Supply Relay Protection Single Pole Tripping Source Equivalent System Transmission Line WSCC 9-bus
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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