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Date Code 20020129
Differential, Restricted Earth Fault,
3-45
Overcurrent, Voltage, and Frequency Elements
SEL-387E Instruction Manual
1, when the element is at rest during normal system operation. You can verify the state of the bit
using the
TAR
command via a serial port or the front panel. You can force this bit to 1 during
element testing using the Level 2 serial port command
RES
or the front-panel RESET51 function
under the OTHER button.
Setting Descriptions
This subsection contains setting names, setting ranges, and labels for the overcurrent elements
associated with Winding 1. Windings 2 and 3 overcurrent element settings have similar names
and labels. All windings have identical setting ranges.
Note:
All negative-sequence element pickup settings are in terms of 3I
2
.
Winding n Overcurrent Element and Demand Threshold Enables (EOCn)
Range:
Y,
N
Set EOC1 = Y to enable overcurrent elements and demand thresholds for Winding 1. The
operation is identical for the other three windings. The relay default is for Winding 1–3
overcurrent elements and demand thresholds to be enabled.
Combined O/C Element Enable (EOCC)
Range:
Y,
N
Set EOCC = Y to enable combined overcurrent elements. A setting of EOCC = N disables the
elements.
Instantaneous and Definite-Time Element Pickups (50PnmP, 50QnmP, 50NnmP)
Range:
1 A: OFF, (0.05–20), A secondary, in 0.01 A steps
5
A:
OFF,
(0.25–100), A secondary, in 0.01 A steps
Note:
n = Winding 1, 2, or 3; m = Level 1, 2, 3, or 4.
Set pickups for the current level above which you want the elements to assert. As the name of the
instantaneous elements suggests, assertion occurs almost immediately after current exceeds the
threshold you specify. A definite-time element asserts only after current exceeds the level you
specify and after a time delay that you specify with the definite-time delay setting.
Definite-Time Element Delays (50Pn1D, 50Qn1D, 50Nn1D)
Range:
0–16000 cycles, in 0.25-cycle steps
Select a time in cycles that you want definite-time elements to wait before asserting.
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