Implementation of negative phase sequence protection in the high voltage distribution network

Taylor, Scott (2016) Implementation of negative phase sequence protection in the high voltage distribution network. [USQ Project]

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Abstract

Negative phase sequence protection is effective at detecting certain faults, and is now available on modern reclosers. However, it has not been widely utilised in electrical distribution networks. This thesis reviews and researches protection schemes with a focus on negative phase sequence protection and puts forward methods for its implementation specific to the distribution network.

Charles Fortescue’s 1918 paper detailed his discovery of symmetrical components on which much of modern power system analysis and protection is based (Fortescue CL 1918). The theory of symmetrical components is essentially a way of describing and modelling the relationship between the three phases of an electrical distribution network.

Faults on the distribution network result in current flow with specific characteristics. Modern electronic reclosers can be programmed to analyse and operate for faults based on these sequence (symmetrical) components.

Negative phase sequence protection can have a pickup setting lower than normal load current, and still detect particular fault types including line to line faults. This gives negative phase sequence protection a distinct advantage over traditional overcurrent techniques and means that protection coverage can be extended further into the network without the need for line reconducting or the installation of fuses.

Whilst there are a number of existing papers that deal with traditional protection techniques, there are not many that focus on negative phase sequence protection, especially for the distribution network. This thesis aims to facilitate discussion on negative phase sequence protection, increase network employee’s familiarity of it, explore where it is and is not effective, and put forward methodologies with practical examples in the form of case studies for its implementation.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) Major Power Engineering project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Supervisors: Ahfock, Tony
Date Deposited: 24 Jul 2017 01:43
Last Modified: 24 Jul 2017 01:43
Uncontrolled Keywords: negative phase sequence protection; high voltage; distribution network; load current
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090607 Power and Energy Systems Engineering (excl. Renewable Power)
URI: http://eprints.usq.edu.au/id/eprint/31495

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