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α
MHOZ1ØG-5IN
Voltage
+39.0
52.66
+49.0
59.54
+59.0
64.60
+69.0
67.70
+79.0
68.75
+89.0
67.70
+99.0
64.60
+109.0
59.54
+119.0
52.66
6.2.4.3 Z3 (AG. BG CG) PHASE TO GROUND MEASUREMENT UNIT REACH
Change the settings:
213 - Z3 TRIP:
214 - Z2 TRIP:
215 - Z1 TRIP
1. Apply the following voltages to the relay through the rear terminals A2-A3,
A4-A5, A6-A7. THE ANGLES ARE LAGGING!
VA (A2-A3) = 67 0°
2. Adjust the fault current argument in accordance with table MHOZ3ØG-5IN or
table MHOZ3ØG-1IN, according to the rated current: (it is left to the user's
discretion to select the characteristic point(s) to check).
3. Set the fault current (IA, IB, or IC according to the phase in fault) to 3.5 A for IN
= 5 and 2 A for IN = 1 and the rest of the currents to zero.
4. Reduce the voltage of the phase in fault gradually and check that the relay trips
when the voltage is within the limits listed in tables MHOZ3ØG-5IN or
MHOZ3ØG-1IN.
5. Reduce the fault current to zero.
6. Repeat the tests for faults in phases BG and CG.
α= degrees that V leads I
GEK-98846A
In=5A
Acceptable Range
49.87 - 55.12
56.38 - 62.31
61.18 - 67.61
64.11 - 70.86
65.10 - 71.95
64.11 - 70.86
61.18 - 67.61
56.38 - 61.31
49.87 - 55.12
VB (A4-A5) = 67 120°
70
MHOZ1ØG-1IN
Voltage
Acceptable Range
22.90
21.59 - 23.87
25.89
24.41 - 26.98
28.09
26.49 - 29.28
29.44
27.76 - 30.68
29.89
28.19 - 31.15
29.44
27.76 - 30.68
28.09
26.49 - 29.28
25.89
24.41 - 26.98
22.90
21.59 - 23.87
YES
NO
YES
VC (A6-A7) = 67 240°
In=1A
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