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Date Code 20150401 SEL Application Guide 2015-12
SINGLE-TERMINAL AND MULTITERMINAL TEST PROCEDURE
Current injection for these tests is based on the differential element selected in the 87L test mode,
as described in the previous section. This procedure checks the pickup, radius, and angle settings.
The following is a list of the settings that are used and tested in this application guide:
• 87LPP, 87LQP, and 87LGP are the differential pickups for phase, negative-sequence, and
ground elements.
• 87LPR, 87LQR, and 87LGR are the Alpha Plane radius settings for phase, negative-
sequence, and ground elements.
• 87LPA, 87LQA, and 87LGA are the Alpha Plane blocking angle settings for phase,
negative-sequence, and ground elements.
As mentioned previously, 87TOUT is the Relay Word bit that is targeted to look for differential
element operation in test mode. Use the TAR 87TOUT 1000 command to see the differential
element assert (Relay Word bit changes from 0 to 1) or drop out (Relay Word bit changes from
1 to 0) as the test currents are applied.
Use the MET DIF command while injecting currents to look at measured quantities, the validity
of the test set injected quantities, and the position of the operating point on the Alpha Plane. The
following shows an example MET DIF command output capture for a sample single-terminal
characteristic test:
=>>MET DIF
Relay 1 Date: 05/11/2012 Time: 10:42:35.698
Station R Serial Number: 1111240304
87L Communication: Master
87L Function: Available
Stub Bus: Disabled
Local Terminal
IA IB IC I1 3I2 3I0
MAG (pu) 1.634 0.000 0.000 0.545 1.634 1.634
ANG (DEG) 0.00 37.44 37.44 0.00 0.00 0.00
THROUGH (pu) 1.634 0.000 0.000 0.000 0.000
Remote Terminal 1
IA IB IC I1 3I2 3I0
MAG (pu) 6.535 0.000 0.000 2.178 6.535 6.535
ANG (DEG) 79.97 37.44 37.44 79.97 79.97 79.97
THROUGH (pu) 6.534 0.000 0.000 0.000 0.000
Differential
IA IB IC 3I2 3I0
MAG (pu) 7.007 0.000 0.000 7.007 7.007
ANG (DEG) 66.70 37.44 37.44 66.70 66.70
Alpha Plane
87LA 87LB 87LC 87LQ 87LG
k 0.250 1.000 1.000 0.000 0.000
alpha (DEG) 79.94 180.00 180.00 0.00 0.00
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