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NV10P - Manual - 01 - 2015
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
Inductive VTs versions
Relay nominal voltage
U
n
Two reference voltage are available:
U
R
= 100 V and
U
R
= 400V
The
U
n
relay nominal voltage must be set to the value of relay input voltages at grid nominal volt-
age.
The
U
n
value must calculated as:
If VTs with primary nominal voltage is equal to the grid voltage divided by √3, the following stream-
lined calculus may be used:
U
n
= VTs secondary nominal voltage [V] x √3
Example 1
The relay nominal voltage may be set to:
U
n
=
U
ng
/ √3 ·
K
TV
= 6000 /√3 · 60 = 100 /√3 = 58 V
•
•
•
•
•
•
•
Voltage transformer ratio
K
TV
Grid nominal voltage
U
ng
where the VTs are included [V]
U
n
=
Voltage transformer ratio
K
TV
Grid nominal voltage
U
ng
where the VTs are included [V]
U
n
=
Es1-Un.ai
K
TV
=
/
/
V
V
6000
3
100
3
= 60
U
ng
= 6.0 kV
NV10P
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
n
a
N
A
L1
L2
L3
Phase to ground VTs connection
B5
B6
B3
B4
B1
B2
Es1-Un.ai
K
TV
=
/
/
V
V
6000
3
100
3
= 60
U
ng
= 6.0 kV
NV10P
U
L1
U
L2
U
L3
VOL
TAGE INPUTS
n
a
N
A
L1
L2
L3
Phase to ground VTs connection
B5
B6
B3
B4
B1
B2
