Thytronic XMR-D - Page 283

FUNCTION CHARACTERISTICS
283
The operating mode may be selected by setting the Mode67N parameter, located inside the Set \
Profile A (or B) \ Directional earth fault overcurrent-67N(Comp) \ Common configuration menu.
The settable operating mode is I (module) or I*cos (projection).
For both the operating modes, the polarizing reference used for displacement measure of the resi-
dual current may be selected:
• Direct residual voltage - the measured U
E
voltage is employed.
• Calculated residual voltage - the calculated U
EC
voltage is employed, where the fundamental com-
ponent and phase are derived from the instantaneous values of the three input phase-to-neutral
voltages.
Therefore, for both operating mode, the displacement of the residual current phasor I
ECH
or I
ECL
and the residual voltage phasor (U
E
or U
EC
for direct/calculated residual voltage measurement type),
positive for lagging current compared with voltage (Φ
E
=(∠U
E
- ∠I
EC
, Φ
EC
=(∠U
EC
- ∠I
EC
.
The residual voltage measurement type may be selected by setting the 3Votype67N parameter,
located inside the Set \ Profile A (or B) \ Directional earth fault overcurrent-67N(Comp) \ Common
configuration menu. The measurement type is UE (direct measure of residual voltage) or UEC (cal-
culated residual voltage).
For each of the four thresholds (I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>), the characteristic angle (ϑ
E
>,
ϑ
E
>>, ϑ
E
>>>, ϑ
E
>>>>) may be adjusted (setting range 0…359° common for the three phases).
Similarly, the calculated residual current measurement is selected from the following two measures:
• Calculated residual current on side H - the calculated I
ECH
current is employed, where the funda-
mental component and phase are derived from the instantaneous values of the three input pha-
se-currents.
• Calculated residual current on side L - the calculated I
ECH
current is employed, where the funda-
mental component and phase are derived from the instantaneous values of the three input pha-
se-currents.
The residual current measurement type may be selected by setting the ECtype67NC parameter,
located inside the Set \ Profile A (or B) \ Directional earth fault overcurrent-67N(Comp) \ Common
configuration menu. The measurement type is IECH (side H) or IECL (side L).
For each of the four thresholds (I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>), the characteristic angle (ϑ
E
>,
char-F67NC-mode.ai
I
ECH o
I
ECL
U
E
U
EC
Φ
E
o Φ
EC
Thresholds ( I
EDC threshold
):
I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>
[M(C)]∙(I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>)
Thresholds ( I
EDC threshold
):
I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>
[M(C)]∙(I
EDC
>, I
EDC
>>, I
EDC
>>>, I
EDC
>>>>)
I
E
Φ
E
o Φ
EC
U
E
U
EC
I
I∙cos
3Votype67NC IECtype67NC
U
E
U
EC
I
ECH
I
ECL
67N(Comp)
I
L1H
, I
L2H
, I
L3H
I
L1L
, I
L2L
, I
L3L
Mode67NC
3V
o
I
I∙cos
3Votype67NC IECtype67NC
U
E
U
EC
I
ECH
I
ECL
67N(Comp)
I
L1H
, I
L2H
, I
L3H
I
L1L
, I
L2L
, I
L3L
Mode67NC
3V
o
Operating characteristics of the earth fault overcurrent element - 67N(Comp)
with module operating mode (I)
Operating characteristics of the earth fault overcurrent element - 67N(Comp)
with projection operating mode ( I∙cos)
Characteristic axis
Characteristic axis
Half operating sector
(β
E>
, β
E>>
, β
E>>>
, β
E>>>>
)
Half operating sector
(β
E>
, β
E>>
, β
E>>>
, β
E>>>>
)
Half operating sector
(β
E>
, β
E>>
, β
E>>>
, β
E>>>>
)
Half operating sector
(β
E>
, β
E>>
, β
E>>>
, β
E>>>>
)
Characteristic angle
(Θ
E>
, Θ
E>>
, Θ
E>>>
, Θ
E>>>>
)
Characteristic angle
(Θ
E>
, Θ
E>>
, Θ
E>>>
, Θ
E>>>>
)
Trip sector
(toward line)
Trip sector
(toward line)
No trip sector
(toward busbar)
No trip sector
(toward busbar)
Operating characteristics of the ground directional overcurrent elements - 67N(Comp)
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021