Authors :
S.S. Raut; S.S. Hadpe
Volume/Issue :
Volume 5 - 2020, Issue 6 - June
Google Scholar :
http://bitly.ws/9nMw
Scribd :
https://bit.ly/2CZRGNK
DOI :
10.38124/IJISRT20JUN971
Abstract :
The necessity for dependability and safety in
power system is rising at an alarming rate as the power
system designs are getting more & more complex. In
order to ensure maximum reliability, the numerical
protection relays must receive accurate measurements.
One of the most important input measurements desired
by the relay is current. Nevertheless, the current
measurements expected from current transformers
(CTs) can be inaccurate due to occurrence of a
phenomenon called as CT saturation. CT saturation
causes distortion in the secondary current, which is not
linearly proportional to the primary current, leading to
mal-operation of protection devices. Therefore it
becomes extremely vital that the numerical protection
relay, also known as intelligent electronic device (IED)
senses the CT saturation condition and blocks its
operation so as to avoid mal-operation of the IED which
may lead to supply interruption, further resulting in
production losses and undesirable switching of the
sensitive equipments affecting system reliability and
customer satisfaction. This paper includes a review of
the background about CTs & proposes a novel
methodology to exclusively sense the CT saturation
using the numerical protection relays reliably and cost
effectively.
Keywords :
IED, CT Saturation, Fast Fourier Transform (FFT).
The necessity for dependability and safety in
power system is rising at an alarming rate as the power
system designs are getting more & more complex. In
order to ensure maximum reliability, the numerical
protection relays must receive accurate measurements.
One of the most important input measurements desired
by the relay is current. Nevertheless, the current
measurements expected from current transformers
(CTs) can be inaccurate due to occurrence of a
phenomenon called as CT saturation. CT saturation
causes distortion in the secondary current, which is not
linearly proportional to the primary current, leading to
mal-operation of protection devices. Therefore it
becomes extremely vital that the numerical protection
relay, also known as intelligent electronic device (IED)
senses the CT saturation condition and blocks its
operation so as to avoid mal-operation of the IED which
may lead to supply interruption, further resulting in
production losses and undesirable switching of the
sensitive equipments affecting system reliability and
customer satisfaction. This paper includes a review of
the background about CTs & proposes a novel
methodology to exclusively sense the CT saturation
using the numerical protection relays reliably and cost
effectively.
Keywords :
IED, CT Saturation, Fast Fourier Transform (FFT).
