
5–19
Testing – 5
46 Negative Sequence Overcurrent Inverse Time (Current Unbalance) –
Intertie Protection
VOLTAGE INPUTS
:
None
CURRENT INPUTS
:
Configuration C1
TEST SETTINGS
:
Pickup
P
%
(10 to 100)*
(*
of Nominal Current)
Standard Inverse Time Curves
1
:
Curve
C
(1 to 4)
Time Dial
TD
(0.5 to 11.0)
IEC Inverse Time Curves
1
:
IEC Curve
C
(5 to 8)
IEC Time Dial
TD
(0.05 to 1.10)
Programmed Outputs
Z
OUT
(1 or 2)
Function 46 Definite Time
Disable
Functions 27, 79
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.
IEC Curve Testing
: Test current level may be chosen as a multiple of any level within the Pickup
(
P
) range. Calculate the operating time for the applied current and appropriate Time Dial (
TD
)
setting from the table below. Choose 4 or 5 test levels and calculate the operating times for each.
Curve 5
t=TD x
0.14
M
0.02
- 1
[
]
Curve 6
t=TD x
13.5
M - 1
[
]
Curve 7
t=TD x
80
M
2
- 1
[
]
Curve 8
t=TD x
120
M - 1
[
]
IEC Class A
Standard Inverse
IEC Class B
Very Inverse
IEC Class C
Extremely Inverse
IEC Class D
Long Time Inverse
t = time in seconds, TD = Time Dial setting, M = current in multiples of pickup
Standard Curve Testing
: The operating time will be read from Appendix D, Inverse Time Curves,
for the applied current and appropriate Time Dial (
TD
) setting.
5.
Time Test
: With output contacts (
Z
) connected to stop the timer, apply currents equal to the
multiple of the Inverse Time Pickup (
P
) chosen in Step 4, and start timing. The operating time will
be as calculated in Step 4,
&
3 cycles or
&
10% (for M=2 and above).
6.
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 point.
Q
NOTE
: For proper testing, use current below 3 times CT rating.
1
Either a Standard Curve or an IEC Curve must be selected
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 ...