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SEL Application Guide 2015-12 Date Code 20150401
SINGLE-TERMINAL TESTS
Pickup Setting Check
Step 1. Connect the proper local current source. Start with no current applied.
Step 2. Slowly increase the applied local current until Relay Word bit 87TOUT asserts.
The pickup value should be within ±5 percent of the value calculated by (1):
(1)
where:
87LTAPn is 87LTAPW or 87LTAPX, depending on which input is under test.
87LkP is 87LPP for an 87LA, 87LB, or 87LC test; 87LQP for an 87LQ test;
and 87LGP for an 87LG test.
Radius Setting Check
Step 1. Connect the proper local and remote current sources suggested in Table 1.
Step 2. Set the magnitudes of the local and remote currents equal to each other and greater
than the pickup value calculated in (1). Set the local current angle at 0 degrees and
the remote current angle at 180 degrees.
Step 3. Confirm that 87TOUT is deasserted.
Step 4. Slowly increase the local current until 87TOUT asserts. The pickup value should
be within ±5 percent of the value calculated by (2):
PICKUP
I [magnitude of the remote current]•87LkR
=
(2)
where:
87LkR is 87LPR for an 87LA, 87LB, or 87LC test; 87LQR for an 87LQ test;
and 87LGR for an 87LG test.
Block Angle Setting Check
Step 1. Connect the proper local and remote current sources suggested in Table 1.
Step 2. Set the magnitudes of local and remote currents equal to each other and greater
than the pickup value calculated in (1). Set the local current angle at 0 degrees and
the remote current angle at 180 degrees.
Step 3. Confirm that 87TOUT is deasserted.
Step 4. Rotate the angle of the local current in the counter-clockwise direction until
87TOUT asserts. Record this angle as ANG1.
Step 5. Reset the angle of the local current to 0 degrees.
Step 6. Rotate the angle of the local current in the clockwise direction until 87TOUT
asserts. Record this angle as ANG2.
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