Thytronic NC20 - Page 47

47
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Example 1
The unbalance neutral CT primary current I
Nnp
must be set as: I
Nnp
= 100 A
Example 2
The unbalance neutral CT primary current I
Nnp
must be set as: I
Nnp
= 100 A
VTs Phase primary voltage U
np
(phase-to-phase)
This parameter affects the measure of the phase voltages when the primary measurement reading
mode is selected for phase-to-phase, calculated residual voltages, power and energy.
If the formerly indications concerning the relay nominal voltage U
n
are complied (Phase to ground
and phase-to-phase VTS connection diagrams), then the U
np
setting must be adjusted to:
U
np
= grid nominal voltage [V]].
Example 1
The U
np
setting must be adjusted to: U
np
= U
ng
= 6.9 kV
Example 2
The U
np
setting must be adjusted to: U
np
= U
ng
= 6 kV
Measurement reading mode
Measures may be displayed according the following operating modes:
- With RELATIVE setting all measures are related to the nominal value,
- With PRIMARY setting all measures are related to the primary value.
•
•
Es1-INn.ai
1x
K
CT
= 100 A /1 A
52
I
Nn
= 1 A
NC20
Es1-INn.ai
1x
K
CT
= 100 A /1 A
52
I
Nn
= 1 A
NC20
Es2-IEn.ai
3x
K
CT
= 100A / 5A
52
I
Nn
= 5 A
NC20
Es2-IEn.ai
3x
K
CT
= 100A / 5A
52
I
Nn
= 5 A
NC20
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
= 6.9 kV
52
NC20
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
= 6.9 kV
52
NC20
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
NC20
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
NC20