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NV021 - Manual - 08 - 2012
CHARACTERISTICS
4.4 PROTECTIVE
ELEMENTS
Rated values
Inside the Base menu the following parameters may be set:
Relay reference name.
Relay nominal voltages (phase and residual), to which the regulation are related.
Primary nominal values, employed for measures relative to primary values.
Measurements reading mode.
Information for settings:
Relay reference name.
Alphanumeric mnemonic string (max 16 characters) useful for identifi cation of protected plant.
Relay nominal frequency
f
n
This nominal value must be set same as the frequency of the grid.
Example: grid frequency
f
n
= 50 Hz
Relay nominal frequency
f
n
= 50 Hz
Relay nominal voltage
U
n
The
U
n
relay nominal voltage must be set to the value of relay input voltages at grid nominal volt-
age.
Example 1
The relay nominal voltage may be set to:
U
n
=
U
ng
= 400 V
Example 2
The relay nominal voltage may be set to:
U
n
=
U
ng
= 230 V
—
•
•
•
•
•
•
•
U
ng
= 400 V
NV021
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
L1
L2
L3
B5
B6
B3
B4
B1
B2
U
ng
= 400 V
NV021
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
L1
L2
L3
B5
B6
B3
B4
B1
B2
U
ng
= 230 V
NV021
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
L1
N
B5
B6
B3
B4
B1
B2
U
ng
= 230 V
NV021
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
L1
N
B5
B6
B3
B4
B1
B2