Second Harmonic Restraint Verification
Purpose:
To verify the operation of the 2
nd
harmonic restraint function of the 87 element.
Reference Commands:
SL-87, S(n)-87, S(n)-TAP87, SL-VO, SG-CT.
Step 1:
Parallel a 60 Hz current source and a second 120 Hz current source to Terminals A3, A4
(A-phase, Input 1). Refer to Figure 13-16.
An ohmmeter or continuity tester may be used to monitor output contact status.
Figure 13-16. Connection for Harmonic Restraint Verification
(Only Inputs 1 and 2 are shown for simplicity)
Step 2:
Send the commands listed in Table 13-34 to the relay to setup a test of the pickup of the
second harmonic restraint elements.
Table 13-34. Second Harmonic Restraint Elements Setup Commands
Command Purpose
A= Gain
access.
SL-N=NONE
Zero out custom logic settings/overwrite with logic = None settings.
Y Confirm
overwrite.
SL-N=2HAR
Sets 2HAR as custom logic name.
SL-87=1,0 Enables
87.
SL-VO1=87RT
Enables OUT1 to close with 87 restrained trip.
SG-CT2=1,WYE,NA,0
Ctr = 1, ct = wye, xfmr = na, no ground source.
SG-CT3=1,WYE,NA,0
Ctr = 1, ct = wye, xfmr = na, no ground source.
SG-CT4=1,WYE,NA,0
Ctr = 1, ct = wye, xfmr = na, no ground source.
SG-TRIGGER=87RT,87RPU,0
Enable 87RT to log and trigger fault recording.
S#-TAP87=MANUAL,2.00,3.80
set Tap 1 = 2.00 and Tap 2 = 3.80.
13-48
BE1-CDS240 Testing and Maintenance
9365200990 Rev F
Summary of Contents for BE1-CDS240
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