Basler BE1-CDS220, Instruction Manual

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BE1-CDS220 Testing And Maintenance 13-49
circuit
monitor
current
source 1
180 degrees
current
source 2
B1 B3 B5 B7
B2 B4 B6 B8
B9 B11 B13 B15
B10 B12 B14 B16
I
A1
I
B1
I
C1
I
G
I
A2
I
B2
I
C2
I
A1
I
B1
I
C1
I
G
I
A2
I
B2
I
C2
Figure 13-16. Connection for 87ND Restraint Pickup Verification
Step 2. To prepare the 87ND element for testing the restraint operation accuracy, transmit the
commands in Table 13-37 to the relay.
Table 13-37. 87ND Restraint Operation Accuracy 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-87=0 Disables 87
SL-87ND=2,0 Enables 87ND, mode=IG v. CT2, no blk
SL-VO1=87NDT Enables OUT1 to close for 87ND restrained trip
SG-CT2=1,WYE,NA,0 input 2 ctr=1, ct=wye, xfmr=na, no grd source
SG-CTG=1 gnd input ctr=1
SG-TRIGGER=87NDT,
87NDPU,0 Enable 87NDT to log and trigger fault recording
S#-87ND=0.35,15,50m Minpu = 0.35, slope = 15%, minimum time delay
E Exit
Y Save settings
NOTE
The ground differential function always uses the maximum restraint principle as its
operating characteristic. Thus, the slope setting is simply a number between 15 and 60.
Step 3. The auto tap compensation logic of the relay will calculate TAPN and TAPG values based on
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).