4.191
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Other Settings
Unlatch Trip Logic
Each of the five trip logic equations has an associated unlatch trip SEL
OGIC
control equation. Following a fault, the trip signal is maintained until all of the
following conditions are true:
➤
Minimum trip duration time (TDURD) passes.
➤
The TRm (m = X, 1, 2, 3, or Y) SEL
OGIC
control equation result
deasserts to logical 0.
➤
One of the following occurs:
➢
Unlatch Trip SEL
OGIC
control equation setting
ULTRIP asserts to logical 1.
➢
Target Reset SEL
OGIC
control equation setting
RSTTRGT asserts to logical 1.
➢
Target Reset Relay Word TRGTR asserts. The TRGTR
is asserted when the front-panel
TARGET
RESET
pushbutton is pressed or a target reset serial port
command is executed (ASCII, Modbus, or DeviceNet).
52A Breaker Status Conditions SEL
OGIC
Control Equation
You can connect an auxiliary contact of the high and low-side breaker to the
relay. The SEL
OGIC
control equations 52AX and 52AY allow you to configure
the relay for either the 52a or the 52b contact input (or other contact that
indicates a closed breaker). The factory-default setting assumes no auxiliary
contact connection (both 52AX and 52AY := 0).
If you connect the breaker auxiliary contact to a digital input, you must change
the factory-default logic equation. For example, set 52AX :=
IN101
if you
connect the 52a contact of breaker 52X to input
IN101
.
Figure 4.130 shows a close logic diagram of breaker 52X; the logic of
breaker 52Y is similar.
Figure 4.130
Close Logic
CL Close SEL
OGIC
Control Equation
There are two close logic equations within the SEL-700G. These equations are
designed to operate when the SEL
OGIC
control equation close variable setting
CLm is asserted (m = X or Y) and to unlatch when the SEL
OGIC
control
equation setting ULCLm is asserted. The output of the logic is the Relay Word
bit CLOSEm.
The relay controls the closing output contact(s) when the Relay Word bit
CLOSEm appears in an output contact SEL
OGIC
control equation. Assign the
CLOSE bits to the output relays you need for your application. See
Figure 2.20 for a typical close circuit connection.
CFDX
0
CLX
ULCLX
CLOSEX
CFX
Close Failure Timer
SEL
OGIC
Equations
52AX
Relay
Word
Bits
Summary of Contents for SEL-700G Series
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