ABB REL300 Instruction Manual page 139

Step 10 (b). Repeat Step 10 (a) except apply the fault angle of 30° and the trip current should
Step 10 (c). Repeat Step 10 (a) and 10 (b) except for the setting of Z1GR = 4.5 and the trip
Step 10 (d). Repeat Step 10 (c) except for the setting of Z1GR = 13.5. The trip currents should
The distance should be 4.5, 5.24,, respectively. No trip for Ia angles between -120° and -270°.
Step 11.
1.1.1.4 Zone 1 Test/Three-Phase
Step 12.
• V AN = 30V ∠0°
• V BN = 30V ∠−120°
• V CN = 30V ∠120°
Using a value of x = 75° (lagging), the current required to trip is calculated as follows (Note
Targets):
I = --------------------------------------------------- = 6.67 A
Z
Since V2.70 uses I A + I B + I C to calculate 3I 0 , a balanced 3-phase current source is recom-
mended to be used for this test (3I 0 = 0). B-2 gives a concept of the test. If a Doble or Multi-
Amp test set is used, be sure to synchronize the 3-phase currents. If possible, use a multi-trace
storage scope to verify the waveforms of I
In order to plot the MHO circle for different input angle (X), the setting of RT (and RU, if OSB
option is included) should be at maximum (15 ohms). Refer to OSB test for detailed information.
Set TTYP = 3PR. Repeat test; RI2-1 and RI2-2 should be closed. For TTYP = OFF, or 1PR, or
2PR repeat the test. RI2-1 and RI2-2 should be open.
1.1.1.5 Zone 1 Test/Phase-To-Phase
Step 13.
Iax = ----------------------------------------------- -
6.96
be I = 5.65∠−30°. The distance should be 3.18 ohms (± 5%).
a
currents should be Ia = 4.0∠−75°, Ia = 4.0 ∠−30° and Ia = 4.0∠−100°, respec-
tively. The distance should be 4.5 ohms (± 5%)
be:
= 4.0 ∠−75°,
I
a
= 3.43 ∠−30°
I
a
Using Figure B-1, Configurations 2 and 3, repeat (preceding) Step 10 for BG and
CG faults. Note Targets.
Using B-2, connect current and voltage circuits and apply:
= 6.67 ∠−75°
I
A
= 6.67 ∠−195°
I
B
= 6.67 ∠+45°
I
C
V
LN
( )
cos PANG X –
1P
Two methods can be used for this test.
30
( )
cos
57.76 x –
±
5%
, I and I
A B C.
I.L. 40-385.7
A-5