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Author:Shrestha, Rabhu
Title:Impacts of Exceptional Fault Sequences at the Finnish transmission grid
Publication type:Master's thesis
Publication year:2005
Pages:79      Language:   eng
Department/School:Sähkö- ja tietoliikennetekniikan osasto
Main subject:Sähköverkot ja suurjännitetekniikka   (S-18)
Supervisor:Lehtonen, Matti
Instructor:Pottonen, Liisa
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:power system dynamic stability
transmission grid
protection systems
long-duration faults
loadflow
Abstract (eng): This study deals with impacts of exceptional fault sequence m transmission grid.
More precisely, this research work takes the account of substation operations after three phase shunt faults and the impacts of possible failures of the operation on the power system.
This work aims to forecast system condition after exceptional fault sequences of the network by detailed dynamic stability analysis on the real existing Finnish grid.
In other words, this method enables the estimation of the system breakdown.

The simulations done in this thesis takes into account of, three phase line shunt fault, fault location on the line, protection system and circuit breaker operations, different substation structures, and the dynamic behaviour of the power system after different loadflows.
Power System Simulator (PSS/E 29.0) program package by Shaw PTI is used for stability analysis.
The system conditions after the exceptional fault sequences in different load flows are modeled in the PSS/E and the results at different load flows are used to determine the most vulnerable conditions of the system leading the partial breakdown or the entire breakdown of the system.

Contributing factors to partial and total system breakdown after line faults were studied in this research.
On the basis of obtained results, it is interesting to observe that the complete system breakdown is dependent on total load flow of the entire grid rather than regional local load flows.
It also estimates, amount of generation loss as the impacts of these exceptional faults, which contributes towards complete or partial system breakdown.
ED:2005-07-14
INSSI record number: 29016
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