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1.1.4.1
Condition OSB = NO
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
NOTE:
The trip current (I
Test/Three-Phase, page A-5), with the parameters:
1.1.4.2
Condition OSB = YES
Change the OSB setting from NO to YES and RT = 4, RU = 8.
Step 1.
Step 2.
Step 3.
Set the relay per Table A-1(page A-27), except for the following settings:
• Z1P = 10
• Z2GF = 20
• Z1GF = 10
• Z2GR = 0.01
• Z1GR = 0.01
• T2P = 0.1
• Z2P = 20
• T2G = 0.1
(Check: PANG = GANG = 75; RT = RU = 15; OSOT = 4000)
Adjust the inputs as follows:
∠
V
=
40 0°
I
=
a
a
∠
V
=
40
–
120°
I
=
b
b
∠
V
=
40 120°
I
=
c
c
of 2.35A ±5% suddenly. The relay should trip with a display of Z2P
Apply current I
F
= ABC.
of 4.7A ±5% suddenly. The relay should trip with a display of Z1P = ABC.
Apply I
F
Change the RT setting from 15 to 4. Repeat Steps 3 and 4 (above). The relay
should not trip because the RT restricts the 3-phase fault current.
) can be obtained from the equation in test Step 12 (1.1.1.4 Zone 1
F
VLN = 40
PANG = 75
Z1P = 10 (or Z2P = 20)
Change the LED to metering mode with the display of OSB = NO.
Apply a current I F of 2.7A ± 5% suddenly. The display should show OSB = YES for
4 seconds. This means the input power swing is inside the outer blinder (2IBO).
Repeat this test for I
= 4A and 4.5A. The display should show OSB = YES be-
F
cause the power swing is within two blinders (2IBO and 2IBI).
Apply a current of 4.5A and increase the I
trip with a display of Z2P = ABC (or Z1P = ABC). This means the power swing stays
∠
I
–
45°
F
∠
I
–
165°
F
∠
I
75°
F
X = 45
to 5.5A immediately. The relay should
F
I.L. 40-385.7
A-21
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