MC40-SEF
Doc. N°
MO-0475-ING
Copyright 2012
FW: 1320.38.01.x
Date
06.09.2022
Rev.
1
Pag.
6
of
36
2.2 - Operation and Algorithms
2.2.1 - Reference Input Values
Display
Description
Setting Range Step
Unit
I1
100
A
Rated Primary current of phase C.T.
1 - 9999
1
A
I2
5
A
Rated Secondary current of phase C.T.
1 -
5 1/5
A
IN1
1
A
Rated Primary neutral
1 - 9999
1
A
In
100
A
Reference primary current of the relay
1 - 9999
1
A
Freq
50
Hz
System rated frequency
50 -
60 10
Hz
TW
60
sec Warming-up time constant for Thermal Image
60 - 3600
1
sec
Ib
105 %In Maximum admissible continuous overload for Thermal Image
50 -
130 0.1
%In
2.2.2 - Input quantities
2.2.2.1 - Mains Frequency (Freq)
The relay can operate either in 50Hz or 60Hz systems.
The
rated Mains Frequency “Freq”
must be set accordingly.
2.2.2.2 - Phase Current inputs (I1)
The relay directly displays the r.m.s. value of the Phase Currents “
IA
”, “
IB
”, “
IC
”, “
IN
”
, flowing in the
Primary of the input Current Transformers and refers all its measurements to that value.
To make the relay properly working with any C.T., when programming the relay settings, input the value
“I1“ of the pri
mary current of the phase C.Ts
The measure are not displayed below
: < 5% In
2.2.2.3 - Earth Fault Current Input (IN1)
Same as for the Phase Currents, the relay directly displays the r.m.s. value of the Neutral Current flowing
at the Primary of the Current Transformers.
The measure are not displayed below
: < 1% On
