ABB Distribution Protection Unit 1500R
4-2
Relay Design and Specifications
9/99
website:www.abb.com/papd
Figure 4-1. DPU1500R Block Diagram
MUX
LPF
CT
VT
LPF
Ia
Ib
Ic
Va
Vb
Vc
DSP
I F
PGA
ADC
REAL TIME CLOCK
RAM
NON-VOLATILE
EEPROM
RAM
EPROM
CPU
LCD GRAPHICS
DISPLAY
MICRO CONTROLLER
RS-232
PORT
KEYBOARD
LED
TARGETS
ANALOG ACQUISITION SUBSYSTEM
FRONT PANEL CONTROLLER
WATCHDOG
TIMER
+
-
VDC
+15V
A GND
-15V
+5V
D GND
POWER SUPPLY
SPIBUS
I/O
OUTPUT
CONTACTS
INPUT
CONTACTS
OUTPUT
RELAY
OPTOISOLATOR
STANDARD
REAR PORT
RS-232 OR
RS485
INCOM
INCOM/SIU
RS-232/SUI
IRIG-B
OPTIONAL
COMM
CARDS
WITH DP
CT
= CURRENT TRANSFORMER
VT
= VOLTAGE TRANSFORMER
LPF
= LOW-PASS FILTER
MUX
= MULTIPLEXER
PGA
= PROGRAMMABLE GAIN
AMPLIFIER
ADC
= ANALOG TO DIGITAL
CONVERTER
DSP
= DIGITAL SIGNAL PROCESSOR
ROM
= READ ONLY MEMORY
RAM
= RANDOM ACCESS MEMORY
IF
= INTERFACE
EEPROM
=
ELECTRICALLY ERASABLE
PROGRAMMABLE ROM
CPU
=
CENTRAL PROCESSING UNIT
I/O
=
INPUT/OUTPUT LOGIC
uP
=
MICROPROCESSOR
SIU
=
SCADA INTERFACE UNIT
DSP
RAM
FREQUENCY
DETECTOR
FLASH EPROM