80
FUNCTION CHARACTERISTICS
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
The
U
Enp
setting must be adjusted to:
U
Enp
= √3 ·
U
ng
= √3 · 6900 V = 11900 V
Example 2
The
U
Enp
setting must be adjusted to:
U
Enp
= √3 ·
U
ng
= √3 · 10000 V = 17300 V
• 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.
Es2-Ung.ai
K
TV
=
/
/
V
V
6000
3
100 3
= 60
/
/
V
V
6000 3
100 3
= 60
Grid rated voltage
U
ng
= 6 kV
Relay rated voltage
U
n
= 100 V
U
n
= 100 V
U
ng
= 6 kV
52
XMR-x
VTs ratio:
K
TV
=
Es3-Un.ai
U
ng
= 400 V
U
n
= 400 V
52
XMR-x
Es-UEnp.ai
K
VT
=
/
/
V
V
10000 3
3
100 3
= 100 ·
/
/
V
V
10000 3
3
100 3
= 100 ·
Grid rated voltage
U
ng
= 6.9 kV
VT ratio:
K
VT
=
Relay residual rated voltage
U
En
= 69 V
U
En
= 69 V
/
U
ng
= 6.9 kV
52
Insulated or impedance-ground neutral
XMR-x
Es3-UEn.ai
K
VT
=
/
V
V
11000 3
3
100
= 110 /
K
VT
=
/
V
V
11000 3
3
100
= 110 /
Grid rated voltage
U
ng
= 10 kV
Ratio of voltage transformer connected from star neutral to ground:
U
ng
= 10 kV
U
En
= 91 V
XMR-x
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
