Two Phase Measurement Unit's Reach For The Mho Characteristic - GE MLP1000 Manual

α= degrees that V leads I
α
REACTZ2ØG-5IN
Voltage
+49.0 58.33
+59.0 51.36
+69.0 47.16
+79.0 44.85
+89.0 44.03
+99.0 44.57
+109.0 46.56
6.2.6 TWO PHASE MEASUREMENT UNIT'S REACH FOR THE MHO
CHARACTERISTIC
* The operation quantities used in the MHO units for phase-phase faults are:
Fault
ØØ
Where:
Zr: Adjusted impedance reach.
VØn: Ground phase voltage
VØ1m: Negative sequence voltage with memory referenced to the Ø phase.
IØ: Phase current.
Θ1 :
Positive sequence line impedance angle
* Set the following protection settings:
201 - OSB IN SERVICE
202 - LPU IN SERVICE
203 - ROD IN SERVICE:
204 - FF IN SERVICE:
207 - MHO/REACT:
208 - PROTEC. SCHEME
209 - PROT. IN SERVICE
212 - GENERAL TRIP:
213 - Z3 TRIP:
214 - Z2 TRIP:
215 - Zl TRIP:
219 - POSITIVE SEQUENCE IMPEDANCE (ZL1 IMPED):
220 - POSITIVE SEQUENCE ANGLE (ZL1 ANGLE):
221 - ZERO SEQUENCE CURRENT COMPENSATION (K0):
222 - ZERO SEQUENCE ANGLE(ZL0 ANGLE):
223 - Z1 REACH:
224 - Z1X REACH:
225 - Z2 REACH:
226 - Z3 REACH:
228 - Z1 TIMER:
GEK-98846A
In=5A
Acceptable Range
55.42 - 61.25
48.79 - 53.92
44.80 - 49.52
42.61 - 47.09
41.83 - 46.23
42.35 - 46.80
44.23 - 48.89
Operation Quantity
(IØ - IØ')x Zr -(VØ - VØ')
74
REACTZ2ØG-1IN
Voltage Acceptable Range
38.89 36.95 - 40.83
34.24 32.53 - 35.95
31.44 29.87 - 33.01
29.90 28.40 - 31.39
29.36 27.89 - 30.82
29.72 28.23 - 31.20
31.04 29.49 - 32.59
Polarization Quantity.
(VØ1m - VØ1m)
In=1A
NO
NO
NO
NO
MHO
0 = D.E.
YES
YES
YES
YES
YES
6.0
85°
3.0
75º
4.80
1.40
9.00
12.0
0