Thytronic NV10B - Primary Voltage Setting Adjustments

CHARACTERISTICS
41
NV10B - Manual - 04 - 2022
Example 1
The U
np
setting must be adjusted to: U
np
= U
ng
= 6.0 kV
Example 2
The U
np
setting must be adjusted to: U
np
= U
ng
= 6 kV
Example 3
The U
np
setting must be adjusted to: U
np
= U
ng
= 400 V
• Residual primary voltage U
Enp
This parameter affects the measure of the direct residual voltage when the primary measurement
reading mode is selected.
If the formerly indications concerning the relay nominal residual voltage U
En
are complied, then the
U
Enp
setting must be adjusted to (effective for insulated neutral or impedance-ground connected
grids):
U
Enp
= √3 ∙ grid nominal voltage [V].
Example 1
Es1-Ung.ai
K
TV
=
/
/
V
V
6000
3
100 3
= 60
/
/
V
V
6000
3
100 3
= 60
Grid nominal voltage U
ng
= 6.0 kV
VTs ratio: K
TV
=
Relay nominal voltage U
n
= 58 V
U
n
= 58 V
U
ng
= 6.0 kV
52
NV10B
Es2-Ung.ai
K
VT
=
/
/
V
V
6000
3
100 3
= 60
/
/
V
V
6000
3
100 3
= 60
Grid nominal voltage U
ng
= 6 kV
VTs ratio: K
TV
=
Relay nominal voltage U
n
= 100 V
U
n
= 100 V
U
ng
= 6 kV
52
NV10B
Es3a-Un.ai
U
ng
= 400 V
U
n
= 400 V
52
NV10B
Es-UEnp.ai
K
VT
=
/
/
V
V
10000
3
3
100 3
= 100 ·
/
/
V
V
10000
3
3
100 3
= 100 ·
Grid nominal voltage U
ng
= 6.9 kV
VT ratio: K
VT
=
Relay residual nominal voltage U
En
= 69 V
U
En
= 69 V
/
U
ng
= 6.9 kV
52
NV10B
Insulated or impedance-ground neutral