Basler Electric BE1-11t - Manual (Page 394)

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Table 174. Operational Settings (3I0 Mode)
Setting Value BESTCOMSPlus Screen Description
Phase CT
Ratio 1 System Parameters, Sensing
Transformers Sets phase CT ratio to 1
Element
Mode 3I0 Protection, Current, Inverse Overcurrent
(51-1) Enables 51-1 function for
3I0 mode
Source CT Circuit 1 Protection, Current, Instantaneous
Overcurrent (51-1) Selects CT circuit 1 as the
source
51-1
Residual Enabled Target Configuration, Targets Enables residual target for
51-1
Step 2: Use BESTCOMSPlus to configure the BESTlogicPlus programmable logic shown in Figure 261.
•
Blocking is disabled.
•
OUT1 closes for 51-1 Trip.
•
OUT2 closes for 51-1 Pickup.
•
Fault recording is enabled.
Figure 261. BESTlogicPlus Settings (3I0 Mode)
Step 3: Use BESTCOMSPlus to open the Protection, Current, Inverse Overcurrent (51-1) screen and
send the low range test settings (minimum pickup setting) to the BE1-11t for your sensing input
type in Table 175.
Table 175. Pickup Test Settings (3I0 Mode)
Sensing Input Type Range Pickup Setting Time Dial
5 A
Low 0.5 A 0
Middle 5.0 A 0
High 16.0 A 0
1 A
Low 0.1 A 0
Middle 1.0 A 0
High 3.2 A 0
Step 4: Prepare to monitor the 51-1 function operation. Operation can be verified by monitoring OUT2
(see Figure 261).
Step 5: Connect a current source to terminals D1 and D2 (A-phase).
Step 6: Slowly increase the A-phase current until OUT2 closes and record the pickup. Verify that there
is a 51-1-Residual target on the front-panel display. Slowly decrease the applied current until
OUT2 opens and record the dropout.
Step 7: Repeat step 6 for the middle and high range pickup settings for your sensing input type. Record
the results.
Inverse Overcurrent (51) Test BE1-11t