5-12
Trip and Target Logic
Date Code 990215
SEL-351P Manual Técnico
The major differences are in the way optoisolated input settings and the trip settings are made.
The following explanations describe these differences.
Optoisolated Input Settings Differences Between the SEL-321 and SEL-351P Recloser
Control
The SEL-351P does not have optoisolated input settings like the SEL-321 Relay. Rather, the
optoisolated inputs of the SEL-351P are available as Relay Word bits and are used in SEL
OGIC
Control Equations. The following optoisolated input setting example is for a Permissive
Overreaching Transfer Trip (POTT) scheme.
SEL-321 Relay SEL-351P
IN2 = PT
PT1 = IN102
(received permissive trip)
In the above SEL-351P setting example, Relay Word bit IN102 is set in the PT1 SEL
OGIC
Control Equation. Optoisolated input IN102 is wired to a communications equipment receiver
output contact. Relay Word bit IN102 can also be used in other SEL
OGIC
Control Equations in
the SEL-351P. See
Optoisolated Inputs
in
Section 7: Inputs, Outputs, Timers, and Other
Control Logic
for more information on optoisolated inputs.
Trip Settings Differences Between the SEL-321 and SEL-351P Recloser Control
Some of the SEL
OGIC
Control Equation trip settings of the SEL-321 and SEL-351P have
different labels, yet are operationally the same. The correspondence is:
SEL-321 Relay SEL-351P
MTCS TRCOMM
(Communications-Assisted Trip Conditions)
MTO
TRSOTF
(Switch-Onto-Fault Trip Conditions)
MTU
TR
(Unconditional or Other Trip Conditions)
The SEL-321 Relay handles trip unlatching with setting TULO. The SEL-351P handles trip
unlatching with SEL
OGIC
Control Equation setting ULTR.
The SEL-321 Relay has single-pole trip logic. The SEL-351P does not have single-pole trip
logic.
P
ERMISSIVE
O
VERREACHING
T
RANSFER
T
RIP
(POTT) L
OGIC
Enable the POTT logic by setting ECOMM = POTT. The POTT logic in Figure SECTION 5: .6
is also enabled for directional comparison unblocking schemes (ECOMM = DCUB1 or
ECOMM = DCUB2). The POTT logic performs the following tasks:
•
Keys communication equipment to send permissive trip when any element included in
the SEL
OGIC
Control Equation communications-assisted trip equation TRCOMM
asserts and the current reversal logic is not asserted.
•
Prevents keying and tripping by the POTT logic following a current reversal.
•
Echoes the received permissive signal to the remote terminal.
Содержание SEL-351P
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