1.5
Date Code 20020903 SEL-587Z Instruction Manual
Introduction and Specifications
SEL-587Z Functions
Programmable
Output Contacts
The SEL-587Z is equipped with SELOGIC
®
control equations that allow you
to design a custom tripping scheme. SEL
OGIC control equation functions
include timers, local and remote bits, tripping, event report triggering, and
relay output contact control. An example of this flexibility is shown in
Figure 1.4, where OUT1 is set to operate the 86 lockout relay, OUT2 is set to
report a CT open circuit, and OUT3 reports a bus zone alarm.
Figure 1.4 Bus Protection (simplified).
Applying the relay as transformer protection, Figure 1.5 shows the same
contacts configured for different functions. Now output contacts OUT1 and
OUT2 are set to trip the high- and low-voltage breakers, and OUT3 and OUT4
are set to close the high- and low-voltage breakers. Set input IN1 to trip both
high- and low-voltage breakers simultaneously in response to an external trip
command.
Figure 1.5 Transformer Protection (simplified).
Busbar
SEL-587Z
87
86
52 52 52 52
OUT1
OUT2
OUT3
CT Open
Circuit Alarm
BUS ZONE
Operated Alarm
SEL-587Z
87A
87B
87C
OUT1
OUT2
52-252-1
50P1
51P1
50Q1
51Q1 51N
50N
OUT4
OUT3
IN1
From bus
protection
A
B
C
A
C
B
to relay
current
inputs
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