Date Code 20010731 Testing and Troubleshooting 11-35
SEL-352-1, -2 Instruction Manual
6. To verify the point on the wave when the output contact closed view the event
report. EVE S8 displays the Y-side voltages in 8 samples per cycle for the most
recent event generated. After the close input assertion (a greater than symbol
indicates the trigger point), look for the sample that shows the outputs that were
set in Step 1 (CTA, CTB, CTC) picking up. Verify that this sample also
corresponds (±1 sample) to the negative going zero crossing of A-phase voltage.
The A-phase voltage should transition from a positive number to a negative
number.
&7$
9$<N9
'LJLWDO
&\FOHV
9$<
&\FOH
'LJLWDO5HVROXWLRQ
=HUR&URVVLQJ
5HOD\UHFRJQL]HV
&7$ELWDVVHUWLRQ
7. Verify B- and C-phase by comparing the CTB output pick up to the B-phase
voltage and the CTC output to the C-phase voltage.
8. Note that the zero-crossing detection is based on A-phase, and it is assumed that B
and C are 120 and 240 out of phase.
9. Adjust the output timer settings such as ZCApu and PCApu for each phase to test
these timers. Remember that the relay is assuming balanced phase voltages 120
apart for its timer calculations.
10. Repeat Tests 1 through 9, changing the trigger conditions. Use MCLOSE instead
of CLOSE or live Y-side voltages instead of X side.
11. Repeat Tests 1 through 10 asserting TRIPA, TRIPB, or TRIPC inputs to disable
the close logic.
12. Verify the 2-cycle dropout time of MCLOSE by viewing the SER. From assertion
of MCLOSE to the deassertion of ZCNA should be 2 cycles.
13. Verify the CLSdo setting for the CLOSE input by viewing the SER. From
assertion of CLOSE to the deassertion of ZCNA should be the CLSdo setting.
To Next Page
