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REL300 goes into fault mode processing only after the current detector is enabled. REL300
performs the test:
, ∆I
• Phase current (∆I
A
• Voltage ( ∆Van, ∆Vbn, or ∆Vcn ) >7V and 12.5% change with a current change of ∆I>0.5 A
When one of the above is true, REL300 starts fault processing. In order to perform the above,
apply a certain value of current suddenly. If REL300 does not trip, turn the current off, readjust
to a higher value, and then suddenly reapply current.
The current required to trip can be calculated using the following:
I
From Table A-1:
= 4.5 Ω
• Z1GF
• Z1GR
= 0.01
• PANG
= 75°
• ZR
= 3.0
using an X = 75° (lagging)
The current required to trip = 4.00A ± 5 % for fault current lagging fault voltage by 75°. This is
the maximum torque angle test. For other points on the MHO circle, change X to a value be-
tween 0° and 100°, and calculate the value of I.
See Table 4-3, for a description of the following displayed fault data for:
• Fault Type (FTYP)
• Targets (BK1, Z1G)
• Fault Voltages (V
, V
A
(I
, I
, I
, 3I
)
A
B
C
0
With the external jumper connected between TB1-13 and TB1-14, the BFIA-1, BFIA-2 should
be closed. The GS contact will be ON for approximately 50 ms. when the fault is applied. Alarm
2 relay will be picked-up, which can be reset by the RESET button after the fault is removed.
Change TTYP to 1PR; the RI2-1 and RI2-2 should be CLOSED. Change TTYP to 2PR (or
3PR). Repeat test; RI2-1 and RI2-2 should be closed. Change TTYP to "OFF". Repeat test.
RI2-1, RI2-2 should not be picked-up.
, or ∆I
) >1.0A peak and 12.5% change
B
C
V
LN
=
----------------------------------------------------------------------------------------- -
(
) 1
Z
COS PANG X
–
1G
, V
, 3V
) and Currents
B
C
0
(
)
Z
–
1
R
+
------------------- -
3
I.L. 40-385.7
A-3
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