13-10
Testing and Troubleshooting
Date Code 20011205
SEL-311B Instruction Manual
Table 13.1: Fault Locator Test Values
Location Type VA VB VC IA IB IC Units
75 miles
AG
52.89
0.00
69.97
-124.30
70.34
124.10
5.24
-82.40
0.00
0.00
0.00
0.00
V or A
Degrees
BC
67.00
0.00
56.75
-126.20
56.75
126.20
0.00
0.00
7.83
-174.00
7.83
6.00
V or A
Degrees
85 miles
AG
54.24
0.00
69.67
-123.90
70.00
123.70
4.74
-82.40
0.00
0.00
0.00
0.00
V or A
Degrees
BC
67.00
0.00
57.69
-125.50
57.69
125.50
0.00
0.00
7.08
-174.00
7.08
6.00
V or A
Degrees
Faults at 75 miles are within Zone 1, since the Zone 1 reach setting is 80% of the 100-mile line
positive-sequence impedance (see Z1P, Z1MG, and XG1 in the settings). Faults at 85 miles are
beyond Zone 1, but within Zone 2.
Faults listed in Table 13.1 cause certain combinations of output contacts to close and front panel
LEDs to illuminate. You may use the front panel LCD functions to examine the short form fault
data following each test. Table 13.2 shows the expected results.
Table 13.2: Output Contact and Target LED Results
Location
Type
Output Relays
Target LEDs
75 miles
AG
OUT1, OUT2, OUT4
INST, Zone 1, A, G
75 miles
BC
OUT1, OUT2, OUT4
INST, Zone 1, B, C
85 miles
AG
OUT1, OUT2, OUT4
TIME, Zone 2, A, G
85 miles
BC
OUT1, OUT2, OUT4
TIME, Zone 2, B, C
Output Contact Explanation
The OUT1 and OUT2 are set to close for trips. The relay is set to trip instantaneously for Zone 1
faults, with a short time delay for Zone 2 faults, and by operation of the residual and negative-
sequence time-overcurrent elements. OUT4 is set to close for assertion of the KEY element.
The KEY element is used in Permissive Overreaching Transfer Tripping protection schemes to
send the permissive signal to the remote end. The SEL-311B Relay asserts the KEY element
when overreaching Zone 2 elements pick up, if other conditions permit. (Note: The POTT
scheme is not available in the SEL-311B and SEL-311A Relays.)
Target LED Explanation
The TRIP target illuminates at the rising edge of trip(the new assertion of the TRIP Relay Word
bit).
The TIME target illuminates at the rising edge of trip if the SEL
OGIC
control equation FAULT
has been asserted for more than 3 cycles.
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