5-20 Trip and Target Logic Date Code 990215
SEL-351P Manual Técnico
is driven by a communications equipment receiver output (see Figure SECTION 5: .12). Make
SEL
OGIC
Control Equation setting LOG1:
LOG1 = IN105 (two-terminal line application)
In three-terminal line DCUB applications (setting ECOMM = DCUB2), loss-of-guard signals are
received from two
remote terminals. Two optoisolated inputs on the SEL-351P (e.g., input
IN105 and IN107) are driven by communications equipment receiver outputs (see
Figure
SECTION 5: .13). Make SEL
OGIC
Control Equation settings LOG1 and LOG2 as follows:
LOG1 = IN105 (three-terminal line application)
LOG2 = IN107
SEL
OGIC
Control Equation settings LOG1 and LOG2 are routed into the DCUB logic in Figure
SECTION 5: .10 for “unblocking block” and “permissive trip receive” logic decisions.
Timer Settings
See Section 9: Setting the SEL-351P Recloser Control for setting ranges.
GARD1D – Guard-Present Delay
Sets minimum time requirement for reinstating permissive tripping following a loss-of-channel
condition – typically set at 10 cycles. Channel 1 and 2 logic use separate timers but have this
same delay setting.
UBDURD – DCUB Disable Delay
Prevents tripping by POTT logic after a settable time following a loss-of-channel condition –
typically set at 9 cycles (150 ms). Channel 1 and 2 logic use separate timers but have this same
delay setting.
UBEND – DCUB Duration Delay
Sets minimum time required to declare a loss-of-channel condition – typically set at 0.5 cycles.
Channel 1 and 2 logic use separate timers but have this same delay setting.
Logic Outputs
The following logic outputs can be tested by assigning them to output contacts. See Output
Contacts in Section 7: Inputs, Outputs, Timers, and Other Control Logic for more information
on output contacts.
UBB1, UBB2 – Unblocking Block Output(s)
In two-terminal line DCUB applications (setting ECOMM = DCUB1), UBB1 disables tripping if
the loss-of-channel condition continues for longer than time UBDURD.
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