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6.2.3. RELAY MEASUREMENT
Apply current to the relay through the rear terminals B7-B12, bridging the terminals
B8-B9 and B10-B1 land applying voltage to the terminals A2-A3, A4-A5, and A6-A7; enter
into the single key menu and check that the relay correctly measures the currents and
voltages applied.
The voltage and current values that must be checked are:
I (Amp)
0.10 (*In)
0.50 (*In)
1.00 (*In)
2.00 (*In)
5 00 (*In)
10.00 (*In)
V (Vol)
0.70
3.50
7.00
14.00
35.00
70.00
6.2.4 SINGLE PHASE MEASUREMENT UNIT'S REACH FOR THE MHO
CHARACTERISTIC
* The magnitudes used in the mho units for ground faults are:
Fault
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.
VØn:
Ground phase voltage
VØ1m: Positive sequence voltage with memory reference to the phase
IØ:
Phase current.
I0:
Zero sequence current
Θ1 :
Positive sequence line impedance angle
Θ0:
Zero sequence line impedance angle
K0:
Zero sequence compensation constant
GEK-98846A
Acceptable Range
0.09 - 0.11 (*In)
0.47 - 0.52 (*In)
0.95 - 1.05 (*In)
1.90 - 2.10 (*In)
4.75 - 5.25 (*In)
9.50- 10.50 (*In)
Acceptable Range
Quantity Operation
ØG
I'Øx Zr - Vøn
0.66 - 0.73
3.32 - 3.67
6.65 - 7.35
13.30- 14.70
33.2: - 36.75
66.50 - 73.50
Polarization Qty.
VØ1m
67
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