Secondary Value
) is not in V but in mV/Hz, which makes the same setting
value valid for both 50 and 60 Hz nominal frequency.
(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
×
= .
(Equation 2)
With this information, the protection relay's Rogowski sensor settings can
be set.
Table 48: 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.
Basic functions
1MRS758755 C
90 REC615 & RER615
Technical Manual
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