Schweitzer Engineering SEL-351P - Directional Comparison Unblocking (DCUB) Logic

5-18 Trip and Target Logic Date Code 990215
SEL-351P Manual Técnico
Depending on the installation, perhaps one output contact (e.g., OUT105 = KEY) could be
connected in parallel to both transmitter inputs (TX) on the communication equipment in
Figure
SECTION 5: .9. Then output contact OUT107 can be used for another function.
Figure SECTION 5: .8: SEL-351P Recloser Control Connections to Communications
Equipment for a Two-Terminal Line POTT Scheme
Figure SECTION 5: .9: SEL-351P Recloser Control Connections to Communications
Equipment for a Three-Terminal Line POTT Scheme
D IRECTIONAL C OMPARISON U NBLOCKING (DCUB) L OGIC
Enable the DCUB logic by setting ECOMM = DCUB1 or ECOMM = DCUB2. The DCUB logic
in
Figure SECTION 5: .10 is an extension of the POTT logic in Figure SECTION 5: .6. Thus,
the relay requires all
the POTT settings and logic, plus exclusive DCUB settings and logic. The
difference between setting choices DCUB1 and DCUB2 is:
DCUB1 directional comparison unblocking scheme for two-terminal line
(communications from one
remote terminal)