IEC11000296-2-en.vsd
jX
L
L
I
·
2
1
ß
Fwd
Z
L
L
I
L
L
U
Ucomp
1
2
1
2
1
1
·
-
=
REV
Z
L
L
I
L
L
U
Ucomp
1
2
1
2
1
2
·
+
=
Fwd
Z
L
L
I
1
2
1
·
REV
Z
L
L
I
1
2
1
·
-
R
L
L
I
·
2
1
IEC11000296 V2 EN
Figure 149:
Simplified offset mho characteristics for L1-L2 fault in zone 1
Criteria: Operation occurs if 90° ≤ β ≤ 270°.
In the above characteristics,
Z1Fwd
and
Z1Rev
are the forward and reverse reach
percentage values and
ImpedanceAng
is the characteristic angle provided for the zone
1 operation region.
1
1
Z Fwd
Z Fwd
ImpedanceAng
=
Ð
IECEQUATION14000025 V2 EN
(Equation 54)
1
1
Z Rev
Z rev ImpedanceAng
=
Ð
IECEQUATION14000026 V2 EN
(Equation 55)
Voltage and current phasors selected for phase-to-phase loops are:
Sl.No
Phase-to-phase loop
Voltage phasor
Current phasor
1
L1-L2
1 2
UL L
1 2
IL L
2
L2-L3
2 3
UL L
2 3
IL L
3
L3-L1
3 1
UL L
3 1
IL L
Operate time
The operate time delay for zone 1 can be provided using the setting
tZ1
.
7.10.7.2
Operation principle of zone 2
shows the function block diagram describing the functionality of zone 2.
Section 7
1MRK502052-UEN B
Impedance protection
326
Technical manual
Содержание Relion REG670
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