Figure 13-17. Connection for 87ND Minimum Pickup Verification
(Only Inputs 1 and 2 are shown for simplicity)
Step 2:
To prepare the 87ND elements for testing, transmit the commands in Table 13-40 to the relay.
Table 13-40. 87ND Pickup Test Commands
Command Purpose
A= Gain
access.
SL-N=NONE
Zero out custom logic settings/overwrite with logic = None
settings.
Y Confirm
overwrite.
SL-N=NDIFF
Name custom logic for this test.
SL-x87ND=2,0
Enables x87ND, mode = IG v. CT2, no blk.
SL-VO1=x87NDT
Enables OUT1 to close for 87ND restrained trip.
SG-CT2=1,WYE,NA,0 Input
2
ctr = 1, ct = wye, xfmr = n/a, no ground source.
SG-CTG=1
Ground input ctr = 1.
SG-TRIGGER=87NDT, 87NDPU,0
Enable 87NDT to log and trigger fault recording.
S#-87ND=0.1,15,50m
Minpu = 0.1, slope = 15%, 50 ms (minimum time delay).
E Exit.
Y Save
settings.
NOTE
With the relay in service, it is necessary to view the 87ND tap factors by
accessing the HMI Screen \PROT\SGn\87ND\87ND.
Step 3:
The relay auto tap compensation logic will calculate TAPN and TAPG values based on the CT
ratios for the designated phase CTs and the ground CT. Since CTR2 and CTRG are both
equal to 1:1 for this test, the TAPN and TAPG values are both equal to the minimum settings
for either 5 ampere or 1-ampere relays (2.0 and 0.4 respectively). For more information on
auto tap compensation, see Sidebar 13-9.
9365200990 Rev F
BE1-CDS240 Testing and Maintenance
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Summary of Contents for BE1-CDS240
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