Electromechanical System Failure Analysis in Hydropower Plant
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Date
2017-02
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Addis Ababa University
Abstract
In this thesis, assess electromechanical components of hydropower plant condition by using
fault tree analysis. Show the failure occurrences of Gilgel gibe II hydropower plant
generation units.
Also developed and constructed the model of fault tree of electromechanical components of
hydropower plant system based on Gilgel Gibe II hydropower plant in Ethiopia.
The causes are deductively identified as the event causing every possible hazard by
constructing a fault tree. The fault tree is constructed in a hierarchical structure with a single
top event. The qualitative results help in focusing attention on main apparatus of
electromechanical components that contributed to the unreliability of the system. Through
qualitative fault tree analysis of electromechanical components Disabled turbine sub-system
contain 26 single-basic-event minimal cut sets with occurrence probabilities 0.026; this
indicates that disabled turbine sub-system is the highest ranking in qualitative structure
importance which means the disabled turbine sub-system is the weakness point in the
electromechanical system. The Turbine generator unit failure sub-system contain 14 single
basic events and 12 two basic events of minimal cut sets with occurrence probabilities
0.014012, this indicates that The Turbine generator unit failure subsystem is the strongest
point of electromechanical system.
Quantitative analysis is performed to estimate the probability of the top event occurrence and
sub top event occurrences or unreliability of the electromechanical components hydropower
plant system. The quantitative fault tree analysis resulted the rankings of quantitative
contribution of sub-systems to the occurrence of top event are obtained as Disabled Turbine
with occurrences of 0.0256776, Malfunction Generator with occurrences of 0.0158806 and
Turbine-Generator unit failure with occurrences of 0.0139212 respectively. This means that
utmost care should be taken to prevent the occurrence of the most contribute sub-system of
electromechanical system failure. Turbine Failure is the most contribute sub-system of
electromechanical system failure, so it takes care to prevent the electromechanical system.
And finally propose maintenance policy for the common component or system failure
(cooling and lubrication system) under root causes.
Keywords: Fault tree analysis, electromechanical components of hydro power plant
(Turbine, Generator and Governor and Control system)
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Keywords
Fault tree analysis; electromechanical components of hydro power plant (Turbine; Generator and Governor and Control system)