GE ALPS - Page 197

GE Power Management
ALPS Advanced Line Protection System 6-15
6 FUNCTIONAL TESTS (USER SETTINGS) 6.5 ZONE REACH TESTS
6
a) SETTINGS AND CALCULATIONS
1. Record the following relay settings:
(1401), POSSEQANG = [________]
(102), Z1PRREACH = [________] (Zone 1)
(202), Z2PHREACH = [________] (Zone 2)
(302), Z3PHREACH = [________] (Zone 3)
(402), Z4PHREACH = [________] (Zone 4)
Z1PCHARANG = 90° (fixed for Zone 1)
(203), Z2PCHARANG = [________] (Zone 2)
(303), Z3PCHARANG = [________] (Zone 3)
(403), Z4PCHARANG = [________] (Zone 4)
2. Determine the test current,
I
T
, for Zone 1, Zone 2, Zone 3, and Zone 4 from Table 6–2.
I
T
(Z1R) = [________] Amps rms
I
T
(Z2R) = [________] Amps rms
I
T
(Z3R) = [________] Amps rms
I
T
(Z4R) = [________] Amps rms
3. Choose
øI (the I
T
angle). V
NOM
is at maximum when øI = øZ – 30°.
øI
1
= [________]° (Zone 1)
øI
2
= [________]° (Zone 2)
øI
3
= [________]° (Zone 3)
øI
4
= [________]° (Zone 4)
4. Calculate
V
NOM
for each zone by substituting the values of Z
R
, øZ (POSSEQANG), I
T
, and øI into Equations 25 and 26
for
V
NOM
according to zone.
V
NOM 1
= [________] Volts rms (nominal test voltage for Z1P)
V
NOM 2
= [________] Volts rms (nominal test voltage for Z2P)
V
NOM 3
= [________] Volts rms (nominal test voltage for Z3P)
V
NOM 4
= [________] Volts rms (nominal test voltage for Z4P)
If Zone 4 is reversed (Protection Setting 408: Z4DIRECTN = REVERS), remember to add 180° to both the test
current angle, øI
4
, and the impedance angle, øZ
4
. If Zone 4 has a non-zero offset, use the ALPS-Test software
to calculate
V
NOM 4
.
5. Record
V
NOM n
, I
T
, and øI
n
in the space provided in the appropriate Zone reach test.
Table 6–2: TEST CURRENT RANGES FOR PHASE-TO-PHASE REACH
Z
G
REACH
(
I
N
= 5 A)
I
T
(A)
Z
G
REACH
(
I
N
= 1 A)
I
T
(A)
0.1 to 2.5 10 0.5 to 12.5 2
2.5 to 6.0 8 12.5 to 30.0 2
6.0 to 12.0 5 30.0 to 60.0 1
12.0 to 20.0 3 60.0 to 100.0 0.6
20.0 to 30.0 2 100.0 to 150.0 0.4
30.0 to 40.0 1.5 150.0 to 200.0 0.3
40.0 to 50.0 1.0 200.0 to 250.0 0.2
NOTE