A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions

Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemente...

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Bibliographic Details
Main Author: Van Eyssen, Juanita
Other Authors: Petroianu, Alexander
Format: Doctoral Thesis
Language:English
Published: University of Cape Town 2016
Subjects:
Online Access:http://hdl.handle.net/11427/22487
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spelling ndltd-netd.ac.za-oai-union.ndltd.org-uct-oai-localhost-11427-224872020-12-10T05:11:02Z A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions Van Eyssen, Juanita Petroianu, Alexander Electrical Engineering Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemented by another type of protection, known as out-of-step tripping protection. The tripping protection's main functions are to detect total loss of synchronism and send tripping signals to selected locations in the system to initiate islanding. In this research the application of out-of-step blocking and tripping protection was investigated. The motivation for the research was provided by system unstable incidents that occurred in Eskom, the electricity utility of South Africa. Detailed out-of-step protection investigations indicated that the out-of-step blocking and tripping protection applied according to a method which is based on an existing approach failed to detect the unstable conditions. In summary, the detailed investigations showed that the existing approach of applying out-of-step blocking and tripping protection is not adequate as it does not allow the necessary observability1 and correct detection of rotor-angle unstable conditions. 2016-11-10T14:11:48Z 2016-11-10T14:11:48Z 1999 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22487 eng application/pdf University of Cape Town Faculty of Engineering and the Built Environment Department of Electrical Engineering
collection NDLTD
language English
format Doctoral Thesis
sources NDLTD
topic Electrical Engineering
spellingShingle Electrical Engineering
Van Eyssen, Juanita
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
description Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemented by another type of protection, known as out-of-step tripping protection. The tripping protection's main functions are to detect total loss of synchronism and send tripping signals to selected locations in the system to initiate islanding. In this research the application of out-of-step blocking and tripping protection was investigated. The motivation for the research was provided by system unstable incidents that occurred in Eskom, the electricity utility of South Africa. Detailed out-of-step protection investigations indicated that the out-of-step blocking and tripping protection applied according to a method which is based on an existing approach failed to detect the unstable conditions. In summary, the detailed investigations showed that the existing approach of applying out-of-step blocking and tripping protection is not adequate as it does not allow the necessary observability1 and correct detection of rotor-angle unstable conditions.
author2 Petroianu, Alexander
author_facet Petroianu, Alexander
Van Eyssen, Juanita
author Van Eyssen, Juanita
author_sort Van Eyssen, Juanita
title A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
title_short A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
title_full A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
title_fullStr A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
title_full_unstemmed A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
title_sort new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
publisher University of Cape Town
publishDate 2016
url http://hdl.handle.net/11427/22487
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