Recommended protection scheme setting coordination for nine busbars transmission grid
Protection system is one of the important parts of the power system. The protection system can be accepted if and only if it is efficient, reliable and realizes some requirements. For protection of transmission line three stepped distance protection can provide remote backup protection to transmi...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1442/3/RADHWAN%20MOHAMMED%20SALEEM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1442/1/24p%20RADHWAN%20MOHAMMED%20SALEEM.pdf http://eprints.uthm.edu.my/1442/2/RADHWAN%20MOHAMMED%20SALEEM%20WATERMARK.pdf http://eprints.uthm.edu.my/1442/ |
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| Summary: | Protection system is one of the important parts of the power system. The protection
system can be accepted if and only if it is efficient, reliable and realizes some
requirements. For protection of transmission line three stepped distance protection
can provide remote backup protection to transmission line by zone 2 and zone 3, but
during the calculation of operation setting for different protection zones of the
distance relays, some problems have been raised (overlap and under reach). These
problems cause improper trips in the network. The aims at overcoming the problems
are by taking into consideration the specifications of the adjacent transmission lines,
the effect of arc resistance, earth resistance and the effect of remote infeed.
The line protection schemes are composed of distance relays and directional
overcurrent relays where the setting of the relays must be computed considering both
relays. Separate relay computation would lead to loss of selectivity. The standard
IEC 60255 combined with the considerations of zone 2 tripping time have been used
in order to overcome the coordination problems with the main protection (distance
protection) as a local protection and to provide remote backup protection to the other
overcurrent relays in the grid.
In this project, the protection of the transmission lines in typical IEEE, 9-
busbars grid has been investigated in detail. The proper settings for both main
protection (i.e. distance protection) and backup protection (i.e. overcurrent
protection) devices have been determined. MATLAB and ETAP have been used as
simulating tools to validate the protection settings techniques of the relays. Three
approaches of settings have been used for the mentioned relays. The results show the
proper settings of the both relays of the entire project. |
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