
5–17
Testing – 5
46 Negative Sequence Overcurrent Definite Time (Current Unbalance)
VOLTAGE INPUTS
:
None
CURRENT INPUTS
:
Configuration C1
TEST SETTINGS
:
Pickup
P
%*
(3 to 300)*
(*
of Nominal Current)
Time Delay
D
cycles
(1 to 8160)
Programmed Outputs
Z
OUT
(1 or 2)
Functions 27, 46 Inv Time
Disable
1.
Disable functions as shown. See Section 3.2, Setpoints and Time Settings, for procedure.
2.
Confirm settings to be tested.
3.
Connect inputs in Configuration C1 designated above. The phase angles of currents should be
set as
I
A
=
s
0°,
I
B
=
s
120°,
I
C
=
s
–120°
4.
The level of current at which operation is to be expected for an individual setting is: Pickup
current = (
P
% ÷ 100) x (
Nominal Current
). See Table A-3, System Setup Record Form.
5.
Pickup Test
: Press and hold the
TARGET/OUTPUT RESET
pushbutton and slowly increase
the three-phase currents until the
CUR UNBALANCE 46
LED illuminates or the pickup
indicator operates on the Function Status screen. The level will be equal to pickup current
calculated in step 4
&
0.5% or
&
0.1 A for 5 A (
&
0.02 A or
&
0.5% for 1 A units).
6.
Release
TARGET/OUTPUT RESET
pushbutton and decrease the currents. Press
TARGET/
OUTPUT RESET
pushbutton to remove targets.
7.
Time Test
: With output contacts (Z) connected to stop the timer, apply current of at least (
1.1 x
pickup
) amps and start timing. The contacts will close after
D
cycles within
&
2 cycles.
8.
If testing is complete, enable any functions disabled for this test. If other tests are to be
completed, check the proper functions to disable for the next test and proceed from this
configuration.
Summary of Contents for Syncrocloser M-3410A
Page 1: ...Instruction Book M 3410A Intertie Generator Protection Relay ...
Page 39: ...xiv M 3410A Instruction Book This Page Left Intentionally Blank ...
Page 71: ...M 3410A Instruction Book 2 28 This Page Left Intentionally Blank ...
Page 121: ...M 3410A Instruction Book 3 50 This Page Left Intentionally Blank ...
Page 161: ...1 3 A B C M 3410A Instruction Book 4 40 This Page Left Intentionally Blank ...
Page 223: ...M 3410A Instruction Book F 2 This Page Left Intentionally Blank ...