GE ALPS - T12 - Zone 1 Ground Reach Test, M1 G Ground Faults

6-12 ALPS Advanced Line Protection System
GE Power Management
6.5 ZONE REACH TESTS 6 FUNCTIONAL TESTS (USER SETTINGS)
6
4. Calculate the impedance angle, øZ , for each zone, where øZ is the phase angle of the expression,
and is given by
The settings are
øZ
1
= [________]° (impedance angle of Zone 1)
øZ
n
= [________]° (impedance angle of Zones 2, 3, and 4)
Choose the IT test angle (øI) for the zone:
øI
1
= [________]° (Zone 1)
øI
2
= {________]° (Zone 2)
øI
3
= [________]° (Zone 3)
øI
4
= [________]° (Zone 4)
Calculate VNOM for each zone by substituting the values of
Z
R
, Z , øZ , and øI into Equation 6–19 or 6–20.
V
NOM 1
= [________] Volts rms (nominal test voltage Zone 1)
V
NOM 2
= [________] Volts rms (nominal test voltage Zone 2)
V
NOM 3
= [________] Volts rms (nominal test voltage Zone 3)
V
NOM 4
= [________] Volts rms (nominal test voltage Zone 4)
If Zone 4 is reversed (Protection Setting 408: Z4DIRECTN = REVERS), remember to add 180° to both
the test angle,
øI
4, and the impedance angle,
øZ
4.
6.5.3 T12 – ZONE 1 GROUND REACH TEST, M1G GROUND FAULTS
1. Protection Settings:
Z1DISTANCE
(101) Z1PHASE = NO
(104) Z1GROUND = YES
(105) Z1GRDREACH = [_________] ohms,
V
NOM 1
= [_________] V,
I
T
= [_________] A,
øI
1
= [_________]°,
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–12 for the appro-
priate phase under test.
3. Set the relay into test mode 14 (Any Zone1 Ground). The LUI displays: ANY Z1 GRND ON
4. Set the voltage inputs as follows: VA: 67 V rms ∠0°, VB: 67 V rms ∠–120°, VC: 67 V rms ∠–240°.
5. Set the fault current,
I
op
, phase angle to øI = [________], lagging.
6. Set the fault current,
I
op
, to I
T
= [________] amps rms. Reduce the voltage of the faulted phase and check that the A1
contact closes when the voltage is within 7% of
V
NOM
.
7. Reduce the fault current to zero.
8. Return the Zone 1 phase, Z1PHASE, to your specific setting.
2
3
---


POSSEQANG
∠
K
0
3
------


ZERSEQANG
∠
+
∅
Z arc
Z
()
imag
Z
()
real
----------------------


(eq. 6–24)tan
=
NOTE