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α
MHOZ3ØG-5IN
Voltage
+39.0
53.43
+49.0
60.40
+59.0
65.54
+69.0
68.68
+79.0
69.74
+89.0
68.68
+99.0
65.54
+109.0
60.40
+119.0
53.43
6.2.5 SINGLE PHASE MEASUREMENT UNIT'S REACH FOR THE MINIMUM
REACTANCE CHARACTERISTIC
* The operation magnitudes and polarization used in the reactance units for
ground faults in zones 1 and 2 are:
Fault
ØG
Where: I'Øx Zr = (IØ - I0) x Zr/Θ1 + K0 x I0 x Zr/Θ0
= IØ x Zr/Θ1 + I0 x (K0 x Zr/Θ0 - Zr/Θ1)
Zr:
Adjusted impedance reach.
Xr:
Relay reactive impedance.
VØn:
Ground phase voltage
IØ:
Phase current.
I0:
Zero sequence current
Θ1 :
Positive sequence line impedance angle
Θ0:
Zero sequence line impedance angle
K0:
Zero sequence compensation constant
IØ2:
Negative sequence voltage in reference to the Ø phase.
* Set the following protection settings:
201 - OSB IN SERVICE
202 - LPU IN SERVICE
203 - ROD IN SERVICE:
204 - FF IN SERVICE:
205 - MHO/REACT:
206 - PROTEC. SCHEME:
207 - 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):
GEK-98846A
In=5A
Acceptable Range
50.60 - 55.92
57.20 - 63.22
62.06 - 68.60
65.04 - 71.89
66.05 - 73.00
65.04 - 71.89
62.06 - 68.60
57.20 - 63.22
50.60 - 55.92
Operation Magnitude
I'Øx Zr - Vøn
71
MHOZ3ØG-1IN
Voltage
Acceptable Range
30.53
28.84 - 31.88
34.51
32.61 - 36.04
37.45
35.38 - 39.11
39.25
37.08 - 40.98
39.85
37.65 - 41.62
39.25
37.08 - 40.98
37.45
35.38 - 39.11
34.51
32.61 - 36.04
30.53
28.84 - 31.88
Polarization Magnitude.
I2 x Xr
In=1A
NO
NO
NO
NO
REACT
0=D E
YES
YES
NO
YES
YES
6.0
85°
3.0
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