Abstract:
In modern day life the requirement of power supply is
increasingly becoming an absolute necessity. Efficient and
effective power supply hinges on two factors, namely effective
power generation and effective distribution. From the
engineering view point, operational reliability is considered
as a measure of system .effectiveness. Operational reliability,
in turn, is not based on a single quantitative measure. The
most common premises have been, time-dependent reliability,
steady-state availability and the like. In the present work,
plant reliability of Khulna steam power station and distribution
system reliability of Khulna industrial zone have
been studied.
Power generation by steam is by far the cheapest but
problematic. Any steam power plant consists of a large
,number of complex equipments which are liable to failure
due to various causes. From the failure and maintenance
records of the said plant, reliabilities of individual
equipments and the overall system reliability have been
calculated. Based on these, critical equipments have been
identified and their modes of failures have been analysed.
Possible reliability improvement by eliminating principal
mode of failure of each critical equipment has 6een demonstrated.
This has again been compared to reliability improvement
which may be effected by installing stand~~) unit of
critical equipment. Overall system reliability improvement
has also been shown.
vi
Distribution system failures have been analyzed and
found to be random in nature. For this case, reliability
indices have been considered to be failure rate, mean
failure duration and availability. These indices have been
calculated for individual substations, feeders and load
points. Overall system failure rate and mean failure
duration have also been assessed.
For time-dependent reliability, Weibull reliability
function has been used throughout. Disttibuti'on parameters
have been calculated by Maximum Likelihood Estimator and
hazard plotting methods.
