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,
øI4, and the impedance angle, øZ4.
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
Содержание ALPS
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