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Relay Design and Specifications
The DPU1500R design incorporates a 32-bit microprocessor and a 16-bit microprocessor which create a multi tasking
environment. The capabilities of these microprocessors allow the DPU1500R to perform many protective and monitoring
functions. Figure 4-1 shows a block diagram of the unit.
Processor Specifications
The processing power of the DPU1500R provides a true multitasking environment that combines protection, metering
and control. The hardware components of the unit include:
•
CPU—16-MHz, 32-bit 68332 Motorola microprocessor
•
CPU RAM—64K of temporary storage for CPU
•
DSP—a 16-bit analog device digital signal processor handles all analog acquisition and measurement of
input parameters. It also performs all arithmetic iterations of the converted digital input signals.
•
EEPROM stores all protective function settings.
•
16-bit analog-to-digital (A/D) converter
•
FLASH EPROM stores the CPU's programming.
•
DSP RAM—16 K of memory provide temporary storage of DSP's arithmetic values.
•
Real-time battery backed-up clock
Battery Backed-Up Clock
An internal clock time tags the faults in the Fault Record, events in the Operations Record and values in the Load
Profile record. In normal operation, this clock is powered by the DPU1500R. When the DPU1500R is withdrawn from
its case, a battery powers the clock. As long as you turn off the battery backed-up clock during prolonged storage, the
battery should last the life of the unit. Turn off the battery backed-up clock through the front man-machine interface by
entering a "0" for the day.
Relay Design and Specifications
ABB Distribution Protection Unit 1500R
website:www.abb.com/papd
4-1
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