Schweitzer Engineering SEL-351P, Quick Start Manual

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Date Code 990215 Trip and Target Logic 5-13
SEL-351P Manual Técnico
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Prevents channel lockup during echo and test.
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Provides a secure means of tripping for weak- and/or zero-infeed line terminals.
Use Existing SEL-321 Relay POTT Application Guide for the SEL-351P Recloser Control
Use the existing SEL-321 Relay POTT application guide (AG95-29) to help set up the SEL-351P
in a POTT scheme (see preceding subsection
Communications-Assisted Trip Logic – General
Overview for more setting comparison information on the SEL-321/SEL-351P).
External Inputs
See Optoisolated Inputs in Section 7: Inputs, Outputs, Timers, and Other Control Logic for
more information on optoisolated inputs.
PT1 – Received Permissive Trip Signal(s)
In two-terminal line POTT applications, a permissive trip signal is received from one remote
terminal. One optoisolated input on the SEL-351P (e.g., input IN104) is driven by a
communications equipment receiver output (see Figure SECTION 5: .8). Make SEL
OGIC
Control Equation setting PT1:
PT1 = IN104 (two-terminal line application)
In three-terminal line POTT applications, permissive trip signals are received from two remote
terminals. Two optoisolated inputs on the SEL-351P (e.g., input IN104 and IN106) are driven by
communications equipment receiver outputs (see Figure SECTION 5: .9). Make SEL
OGIC
Control Equation setting PT1 as follows:
PT1 = IN104 * IN106 (three-terminal line application)
SEL
OGIC
Control Equation setting PT1 in Figure SECTION 5: .5 is routed to control Relay
Word bit PT if enable setting ECOMM = POTT. Relay Word bit PT is then an input into the
POTT logic in Figure SECTION 5: .6 (for echo keying).
Figure SECTION 5: .5: Permissive Input Logic Routing to POTT Logic