Thytronic NC20 - Page 46

46
46
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Example 2
The relay nominal voltage may be set to: U
n
= U
ng
/K
TV
= 6000 / 60 = 100 V
Example 3
The relay nominal voltage may be set to: U
n
= U
ng
/K
TV
= 6000 / 60 = 100 V
Phase CT primary current I
np
This parameter affects the measure of the phase currents when the primary measurement read-
ing mode is selected. It must be programmed to the same value of the phase CT primary nominal
current.
Example
The phase CT primary current I
np
must be set as: I
np
= 500 A
Relay unbalance CT primary nominal current I
Nnp
This parameter affects the measure of the neutral unbalance current when the primary measure-
ment reading mode is selected. It must be programmed to the same value of the neutral CT(s)
primary nominal current.
•
•
Es2-Un.ai
K
TV
=
/
/
V
V
6000
3
100 3
= 60
U
ng
= 6.0 kV
NC20
U
L1
U
L2
U
L3
VOLTAGE INPUTS
n
a
N
A
L1
L2
L3
B5
B6
B3
B4
B1
B2
Phase to phase VTs connection
Es2-Un.ai
K
TV
=
/
/
V
V
6000
3
100 3
= 60
U
ng
= 6.0 kV
NC20
U
L1
U
L2
U
L3
VOLTAGE INPUTS
n
a
N
A
L1
L2
L3
B5
B6
B3
B4
B1
B2
Phase to phase VTs connection
Es3-Un.ai
K
TV
=
V
V
6000
100
= 60
U
ng
= 6.0 kV
NC20
U
L1
U
L2
U
L3
VOLTAGE INPUTS
aann
AANN
L1
L2
L3
B5
B6
B3
B4
B1
B2
Two VTs connection
Es3-Un.ai
K
TV
=
V
V
6000
100
= 60
U
ng
= 6.0 kV
NC20
U
L1
U
L2
U
L3
VOLTAGE INPUTS
aann
AANN
L1
L2
L3
B5
B6
B3
B4
B1
B2
Two VTs connection
Es-In.ai
K
CT
= 500A/5A=100
52
I
n
NC20
Es-In.ai
K
CT
= 500A/5A=100
52
I
n
NC20