Schweitzer Engineering Laboratories SEL-587Z - Figure 1.2 SEL-587 Z Hardware Block Diagram

1.3
Date Code 20020903 SEL-587Z Instruction Manual
Introduction and Specifications
Overview
The block diagram in Figure 1.2 shows the relay hardware arrangement. A
single microprocessor, data acquisition system, and power supply perform the
functions required to provide high-impedance differential and overcurrent
protection.
Figure 1.2 SEL-587Z Hardware Block Diagram.
LPF
8
7
A
8
7
B
LPF
8
7
C
LPF
I
C
IB
IA
LPF
LPF
LPF
A
/D
P
o
w
er
Su
pp
l
y
ALAR
M
OU
T
4
OU
T
3
IN2
Fr
o
n
t
P
a
n
el
L
o
w-L
e
v
el
T
est
In
te
rf
ace
P
o
r
t
EIA-232
/
EIA-485
*
OU
T
2
IN1
OU
T
1
P
o
r
t
EIA-2
32
Real-Time
Clock
M
i
c
r
o
C
o
n
t
r
o
l
l
e
r
M
u
l
t
i
p
l
e
x
e
r
*Orderin
g
o
p
tio
n