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1.1.4
Zone 1 Test/Three-Phase
Step 12. Using Figure 6-2, connect current and volt-
age circuits and apply:
• V AN = 30V ∠0°
• V BN = 30V ∠−120° IB = 6.67 ∠−195°
• V CN = 30V ∠120°
Using a value of x = 75° (lagging), the current re-
quired to trip is calculated as follows (Note Targets):
V
LN
---------------------------------------------------- - = 6.67 A
I
=
(
)
Z
cos
PANG X
–
1P
Since V2.00 uses I A + I B + I C to calculate 3I 0 , a bal-
anced 3-phase current source is recommended to
be used for this test (3I 0 = 0). Figure 6-2 gives a con-
cept 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
, I
A
B
In order to plot the MHO circle for different input an-
gle (X), the setting of RT (and RU, if OSB option is
included) should be at maximum (15 ohms). The RT
setting is used for load restriction. (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.
1.1.5
Zone 1 Test/Phase-To-Phase
Step 13. Two methods can be used for this test.
a. Using T-connection (with Doble or Multi-Amp
Test Unit; refer to Figure 6-3 for external terminal
connection and configuration 1.
• V
= 1/2 V
@ 0°
A
F
• V
= 1/2 V
@ 180°
B
F
• V
= 3/2 (70) = 105V @ 90° lead
C
Using V
= V
-V
= 30V
F
A
B
• V
= 15V @ 0°
A
• V
= 15V @ 180°
B
(5/92)
IA = 6.67 ∠−75°
IC = 6.67 ∠+45°
±
5%
and I
C.
) required to trip = 3.33A ± 5%,
NOTE: Current (I
A
with an angle of -75 degrees.
The following table is for BC and CA fault tests when
the T-connection is used:
BC
= 105 ∠90°
V
AN
∠0°
V
= 15
BN
∠180°
V
= 15
CN
= 3.33 ∠-75°
I
F
b. Using Y-connection
NOTE: This test is actually for φφG testing (see
Figure 6-3, configuration 1).
1
2
∠
V AN =
V F
-- -
------ -
0°
2
3
1
2
∠
V BN =
V F
-- -
------ -
–
120°
2
3
3
×
V CN =
-- -
70
–
V
AN
2
or
∠
V
= 17.3
0°
AN
∠
V
= 17.3
–
120°
BN
∠
V
= 96.4
120°
CN
For either T or Y connection, using a value of x = 75 °
(lagging), current required to trip:
V
F
I
=
---------------------------------------------------------
(
cos
PANG X
2Z
1P
From Table 6-1:
= 4.5 Ω
• Z
1P
• PANG = 75 °
For Y-connection only, current (IA) required to trip =
3.33A ±5%, with an angle of -45°, because Ian has
already lagged V
(V
F
ab
NOTE: The accuracy of the voltage reading in
the metering mode is between 1 and 77
Vrms. The inaccurate reading on V
will not affect the results of the test.
I.L. 40-385.1B
CA
∠180°
V
= 15
AN
= 105 ∠90°
V
BN
∠0°
V
= 15
CN
= 3.33 ∠−75°
I
F
120°
2
1
∠
2
-- - V
–
F
2
)
–
) by 30°. Review all targets.
CN
6-3
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