BECKWITH ELECTRIC M-3425A, Instruction Book

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M‑3425A Instruction Book
6–50
67N Residual Directional Overcurrent, Definite Time
VOLTAGE INPUTS:
See Below
CURRENT INPUTS:
See Below
TEST SETTINGS:
Pickup P Amps (0.50 to 240.0)
1 Amp (0.1 to 48.0)
Directional Element See Below
Time Delay D Cycles (1 to 8160)
Max Sensitivity Angle MSA Degrees (0 to 359)
Operating Current 3I
O
or I
N
Polarization Type* V
N
, V
X
, 3V
O
(Calculated)
Programmed Outputs Z Output (1 to 8)
Expanded I/O (9 to 23)
* V
X
cannot be selected if Function 25 (Sync) is enabled. 3V
O
can only be used with Line-Ground VT.
Test Setup:
1. Determine the Function 67NDT Residual Directional Overcurrent, Definite Time settings to be tested.
2. Enter the Function 67N Residual Directional Overcurrent, Definite Time settings to be tested utilizing
either the HMI or IPScom
® Communications Software.
3. Disable all other functions prior to testing. Refer to Section 4.4 System Setpoints, for details that
describe disabling/enabling functions.
4. Disable the Directional Element.
5. Connect inputs for the polarization type and operating current selected for testing.
Pickup Test (non-directional)
:
1. Apply current 10% less than pickup
P
to the operating current. If 3
I
0
, use any one of
I
A
,
I
B
, or
I
C
, or
all three in zero sequence.
2. Press and hold the
TARGET RESET
pushbutton in, then slowly increase the current applied to the
selected operating current until the
GND DIFF/DIR O/C 87GD/67N
LED illuminates, or the function
status indicator on the
Monitor Function Status
screen indicates that the function has picked up.
The level should be equal to
PI3 Amps

0.1A or

3%.
3 Release the
TARGET RESET
pushbutton.
4. Decrease the current applied to all phases of the selected operating current. The
OUTPUT
LED will
extinguish.