ABB RELION Series, Technical Manual

Page: 84 / 804

RSV
I
I
K
f
n
pr
r
n
=
×
GUID-6A480073-5C35-4319-8B38-402608D4C098 V2 EN
(Equation 1)
RSV
Rated Secondary Value in mV/Hz
I
n
Application nominal current
I
pr
Sensor-rated primary current
f
n
Network nominal frequency
K
r
Sensor-rated voltage at the rated current in mV
In this example, the value is as calculated using the equation.
150
80
150
50
5 625
A
A
mV
Hz
mV
Hz
×
=
.
GUID-13DE42A0-29C0-4FE0-B00B-1215B37E3B7B V2 EN
(Equation 2)
With this information, the protection relay's Rogowski sensor settings can be set.
Table 29: Example setting values for rogowski sensor
Setting Value
Primary current 150 A
Rated secondary value 5.625 mV/Hz
Nominal current 150 A
Unless otherwise specified, the Nominal Current setting should
always be the same as the Primary Current setting.
If the ratio of the application nominal current I
n
and sensor-rated primary current I
pr
becomes higher, and the rated secondary value needs to be set higher than 46.875 mV/
Hz, the highest value that the relay is able to measure before the current sensor input
is saturated is smaller than the maximum setting value of the current protection.
Table 30: Maximum current protection setting values
Application nominal current
(I
n
)
Rated secondary value with 80 A/
0.150 V at 50 Hz
Current protection maximum setting
value not to be exceeded
...1250 A 1.000...46.875 mV/Hz 40 × I
n
(Also the maximum of the
start value setting range)
1250...2500 A 46.875...93.750 mV/Hz 20 × I
n
2500...4000 A 93.750...150.000 mV/Hz 12.5 × I
n
Section 3
1MRS758755 A
Basic functions
78 REC615 and RER615
Technical Manual