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Abstract
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Protection of electrical network of an industrial
complex is a challenging task in particular in connection to the
power grid. This paper is focused on this challenging task and
reports on the experience of protection coordination
assessment and improvement of electrical network of South
Pars Gas Complex (SPGC) and in particular the third south
Pars refinery. Today South Pars is the economic hub and heart
of the gas and petrochemical industry in Iran. The continuous
and stable production of gas from the South Pars Gas Field is
very important. In order to supply power to the third south
Pars refinery four gas turbine generators (GTG) each with a
capacity of 41.1MW and two emergency diesel generators
(EDG) each with a capacity of 4.5 MW have been installed. In
addition to this, one external line to connect the plant to the
power grid is considered. Now the third refinery as an island
electrical network operates independently from the power grid
and provides energy needs of the refinery process and utility
units. By connecting the refinery’s electrical network to the
power grid short-circuit current value increases. If an error
occurs on the internal network when the refinery is connected
to the power grid, the fault current will be higher compared to
when the Refinery works in island mode. This is because
current is also injected from the power grid to the faulty point.
In this paper, the third south Pars refinery protection
coordination in connection to the power grid will be assessed.
The ETAP software will be used for the simulation. While the
paper reports the practical experience in relation to this
particular case study, the approach and experience helps to
face the practical challenges in similar projects.
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