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6.5 ZONE REACH TESTS
Calculate the impedance angle, øZ , for each zone, where øZ is the phase angle of the expression,
4.
POSSEQANG
2
∠
-- -
3
and is given by
∅ Z
=
arc
The settings are
øZ
= [________]° (impedance angle of Zone 1)
1
øZ
= [________]° (impedance angle of Zones 2, 3, and 4)
n
Choose the IT test angle (øI) for the zone:
øI
= [________]° (Zone 1)
1
øI
= {________]° (Zone 2)
2
øI
= [________]° (Zone 3)
3
øI
= [________]° (Zone 4)
4
Calculate VNOM for each zone by substituting the values of Z
V
= [________] Volts rms (nominal test voltage Zone 1)
NOM 1
V
= [________] Volts rms (nominal test voltage Zone 2)
NOM 2
V
= [________] Volts rms (nominal test voltage Zone 3)
NOM 3
V
= [________] Volts rms (nominal test voltage Zone 4)
NOM 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.
NOTE
6
1.
Protection Settings:
Z1DISTANCE
(101)
Z1PHASE = NO
(104)
Z1GROUND = YES
(105)
Z1GRDREACH = [_________] ohms,
V
= [_________] V,
NOM 1
I
= [_________] A,
T
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
Set the voltage inputs as follows: VA: 67 V rms ∠0°, VB: 67 V rms ∠–120°, VC: 67 V rms ∠–240°.
4.
5.
Set the fault current, I
Set the fault current, I
6.
contact closes when the voltage is within 7% of V
7.
Reduce the fault current to zero.
8.
Return the Zone 1 phase, Z1PHASE, to your specific setting.
6-12
K
ZERSEQANG
0
∠
+
----- -
3
Z ( )
imag
tan
--------------------- -
(eq. 6–24)
Z ( )
real
6.5.3 T12 – ZONE 1 GROUND REACH TEST, M1G GROUND FAULTS
, phase angle to øI = [________], lagging.
op
, to I
= [________] amps rms. Reduce the voltage of the faulted phase and check that the A1
op
T
ALPS Advanced Line Protection System
6 FUNCTIONAL TESTS (USER SETTINGS)
, Z , øZ , and øI into Equation 6–19 or 6–20.
R
.
NOM
GE Power Management
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