Systematic procedure to determine line current differential relay settings with back up distance for a 500 kV ac three phase line

Pasanduka, Timothy (2013) Systematic procedure to determine line current differential relay settings with back up distance for a 500 kV ac three phase line. [USQ Project]

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Abstract

A 500 kV overhead line needs adequate protection for power to be transmitted safely and efficiently. Current differential protection is a type of protection that is used on a 500 kV line. In a three phase network, six matched current transformers are used in line differential protection. Three current transformers are placed at each end of the line with one in each phase. The two current transformers at each end of the line on the same phase are connected in a way to measure the differential current
owing in their secondary windings.

Distance protection is another form of protection used on a 500 kV line. In a three phase network, three current transformers and three voltage transformers are employed
at each end of the protected line. This form of protection looks at the impedance of the line and registers a fault whenever the impedance seen by the relay becomes less
that a set value.

Both current differential and distance protection can be employed at the same time on the same line. This project looks at a systematic way to determine line current
differential relay settings with distance protection as the back up protection on a 500 kV line.

A simulation of faults to determine system behaviour under the fault condition is carried out on both modes of protection. In the case of the current differential, in zone and out of zone faults are simulated using Sim Power Systems.


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Item Type: USQ Project
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Supervisors: Ahfock, Tony
Date Deposited: 24 Jun 2014 01:51
Last Modified: 24 Jun 2014 01:51
Uncontrolled Keywords: determine; line current; relay settings; back up distance; three phase line
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090607 Power and Energy Systems Engineering (excl. Renewable Power)
09 Engineering > 0906 Electrical and Electronic Engineering > 090601 Circuits and Systems
URI: http://eprints.usq.edu.au/id/eprint/24722

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