International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 04 | Apr -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
Reduction of Inrush current in Three Phase Power Transformers using SSSC Device Avinsh Yadav1, Krishna Kant Sharma2, Shivani Johri3, Jyotikant Sharma4 1M.Tech
Student (Sri Balaji College of Engineering and Technology, Jaipur)
2Assistant
Professor (Global Institute of Technology, Jaipur)
3Assistant
Professor (Sri Balaji College of Engineering and Technology, Jaipur)
4Assistant
Professor (Sri Balaji College of Engineering and Technology, Jaipur)
------------------------------------------------------------------------------------------------------------------------------1. Introduction
Abstract- Inrush currents generated by unloaded power transformer often reduce power quality on the system. To
Random power transformer energization can create large
improve this situation, this paper proposes an active inrush
flux asymmetries and saturation of one or more winding
current compensator that is capable of reducing the inrush
cores of the transformer. This saturation results in high
current effectively during startup mode. The proposed compensator
is
based
on
an
inverter-based
magnitude currents that are rich in harmonic content and
series
have a high direct current component. These currents can
compensator which is comprised of a single-phase inverter
cause false operation of protective relays and fuses,
and series transformer. This compensator is also called as
mechanical damage to the transformer windings from
static series synchronous compensator (SSSC). SSSCs are
magnetic forces, and generally reduce power quality on
very frequent events with energization of transformer or
the system. The effects of these transients are normally
starting of large motors although their duration is very
mitigated by de-sensitizing protective relays or over sizing
short. Hence, during voltage stabilizer mode, the existing
fuses. Closing resistors have been used to reduce the
series compensator is controlled by a voltage stabilizer
magnitude of the inrush currents. Controlled closing, or
controller and superimposes a compensating voltage on the
controlling the point on the power frequency voltage wave
inverter output whenever the load voltage deviate from the
where energization occurs, has also been employed to
nominal value. This strategy is easier to implement because
reduce these inrush transients.
it requires no information of the transformer parameters, power- on angle of circuit breaker and measurement of
Although reductions in inrush current magnitudes have
residual flux.
been achieved with controlled closing, the present state of the art does not incorporate residual flux in the control
Keywords
algorithms, which results in non-optimal energization.
Transformers, Inrush Current, Residual Flux, SSSC
Š 2017, IRJET
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