Thytronic XMR-T - Page 57

FUNCTION CHARACTERISTICS
57
• Phase CT primary current for sides H and L I
npH
, I
npL
This parameter affects the measure of the phase currents when the primary measurement reading
mode is selected. It must be programmed to the same value of the phase CT primary rated current.
Example
The phase CT primary currents I
npH
and I
npH
must be set as: I
npH
= I
npL
= 500 A
• Residual CT primary current I
En1p
, I
En2p
This parameter affects the measure of the residual current when the primary measurement reading
mode is selected. It must be programmed to the same value of the residual CT(s) primary nominal
current.
Example 1
The residual CT primary current I
En1p
and I
En2p
must be set as: I
En1p
= I
En2p
= 100 A
Example 2
The residual CT primary current I
En1p
and I
En2p
must be set as: I
En1p
= I
En2p
= 100 A
• VTs Phase primary voltage U
np
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, then the U
np
setting must be adjusted to U
np
= grid nominal voltage [V].
Example 1
The Unp setting must be adjusted to: Unp = Ung = 6.9 kV
Es-In.ai
K
TA
= 500A/5A=100
K
TA
= 500A/5A=100
I
nH
= 5 A
I
nL
= 5 A
side H
side L
XMR-x
Es1-IEn.ai
1x
K
TA
= 100 A /1 A
52
I
En1
= 1 A
1x
K
TA
= 100 A /1 A
I
En2
= 1 A
XMR-x
Es2-IEn.ai
3x
K
TA
= 100A / 5A
52
I
En
= 5 A
3x
K
TA
= 100A / 5A
I
En
= 5 A
XMR-x
Grid rated voltage U
ng
= 6.9 kV
VTs ratio: K
TV
=
Relay rated voltage U
n
= 69 V
Es1-Ung.ai
K
TV
=
/
/
V
V
10000
3
100 3
= 100
/
/
V
V
10000
3
100 3
= 100
U
n
= 69 V
U
ng
= 6.9 kV
52
XMR-x
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021