Testing – 6
6–27
51G Inverse Time Residual Overcurrent, Neutral
VOLTAGE INPUTS:
None
CURRENT INPUTS:
C2
TEST SETTINGS:
Pickup
P
Amps
(0.25 to 12.00)
1 Amp CT Rating
(0.05 to 2.40)
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
Output
(1 to 8)
1.
Disable functions as shown. Refer to Section 3.2, Configure Relay Data, for procedures.
2.
Confirm settings to be tested.
3.
Connect current inputs in Configuration C2 designated previously. Refer to Section 6.4, Input
Configurations, for configurations.
4.
Refer to Appendix D. Calculate test times for levels represented on the graphs. Choose 4 or 5 test
levels and calculate test times for each.
5.
Time Test
: With output contacts connected to the timer, apply current used in calculations from step
4 and start timing. The operating time will be
&
3 cycles or 5% of calculated time. Repeat this step
for each test level chosen. The tested points verify the operation of this function.
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
6.
If testing is complete, enable any functions disabled for this test. If further testing is desired, check
the proper functions to disable for the next test and continue from this point.
1
Either a Standard Curve or an IEC Curve must be selected.
Summary of Contents for M-3520
Page 1: ...Instruction Book M 3520 Intertie Protection Relay ...
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