ABB Distribution Protection Unit 1500R
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Introduction
The Distribution Protection Unit 1500R (DPU1500R) is an advanced microprocessor-based relay that protects electrical
power subtransmission and distribution systems. Available for 5 or 1 ampere secondary current transformers (CTs),
the DPU1500R uses circuit breaker 52a (XO) and 52b (XI) auxiliary contacts for logic input signals. The DPU1500R can
be applied with voltage transformers (VTs) connected for operation at 69 or 120 volts AC phase-to-ground (Wye(Star)),
120 volts AC phase-to-phase (Delta or Open Delta with B phase grounded) or 208 volts AC phase-to-phase (Delta). The
DPU1500R is packaged in a metal case suitable for conventional flush mounting on a rack panel. The microprocessor-
based logic along with the power supply can be totally withdrawn from the case and interchanged with other cases
without the need for calibration. All connections to the DPU1500R are made at clearly identified terminals on the rear
of the unit. Because of its microprocessor capability, the DPU1500R provides the following features in one integrated
package:
• Isolated communication ports for superior noise-free communications
• Password protected settings and controls
• Expanded operating temperature range, from -40
°
C to +70
°
C
• Phase time and instantaneous overcurrent protection: 51P (3I>), 50P-1 (3I>>1), 50P-2 (3I>>2), 50P-3 (3I>>3)
• Ground time and instantaneous overcurrent protection: 51N (IN>), 50N-1 (IN>>1), 50N-2 (IN>>2), 50N-3 (IN>>3)
• Negative sequence (I
2
) time overcurrent protection: 46 (Insc>)
• Multishot reclosing: 79 (O->I)
• Single- and three-phase undervoltage and single-phase overvoltage functions: 27-1P (U<) and 27-3P (3U<)
• Metering: currents, voltages, watts, VARs, watt and VAR hours, power factor, frequency
• Peak demand currents, watts and VARs with time stamp
• Fault locator with estimated distance in miles and fault resistance
• Fault summary and detailed fault records for last 32 trips
• Operations (sequence of events) record for last 128 operations
• Eight (6) user-programmable binary (contact) inputs
• Eight (8) output contacts: six (6) user-programmable
• Three selectable settings tables: Primary, Alternate 1 and Alternate 2
• Cold load pickup function
• Bus breaker backup scheme is easily implemented
• Zone sequence coordination function
• Summation of breaker interrupting duty and breaker operations counter
• Battery backed-up clock maintains date and time during control power interruptions
• Continuous self-diagnostics on power supply, memory elements and microprocessors
• Front RS-232 port and a variety of rear communication port options such as RS-232, RS-485 and Modbus ®
• Optional load profile capability: watts, VARs and voltage for 40, 80 or 160 days
• Optional user-programmable time overcurrent curves
• Optional oscillographic data storage captures 64 cycles of current and voltage waveform data
• Drawout motherboard and power supply from the case and interchange with other cases without the need for calibration
Introduction