The ABB DPU2000 is a microprocessor-based protective relay for subtransmission and distribution power systems. It combines phase and ground overcurrent protection, voltage monitoring, frequency control, and four-zone distance protection in a single metal-housed unit. The relay accepts secondary CT inputs at 5 A or 1 A ratings and VT inputs across 69 V AC phase-to-ground (Wye), 120 V AC phase-to-phase (Delta or Open Delta with B phase grounded), and 208 V AC phase-to-phase (Delta) configurations. Patented automatic CT shorting protects the relay during insertion and withdrawal. Integrated metering tracks currents, voltages, watts, VARs, watt-hours, VAR-hours, power factor, and frequency. Fault recording captures distance in miles and fault resistance for the last 32 trips, with detailed event sequencing for the last 128 operations. Optional oscillographic data storage preserves 64 cycles of current and voltage waveforms.
Technical Specifications
Protection Functions
• Phase and ground instantaneous and time overcurrent protection
• Negative-sequence overcurrent protection
• Directional polarized ground time overcurrent protection (67N)
• User-programmable time overcurrent curves (optional)
• Single- and three-phase undervoltage functions (27-1P, 27-3P)
• Single-phase overvoltage functions (59)
• Negative sequence overvoltage control and alarm
• Over/under frequency protection (81S-1, 81S-2, 81R-1, 81R-2, 810-1, 810-2)
• Four zones of phase distance protection (21-1, -2, -3, -4) with MHO or circular characteristic
• Breaker failure detection and zone sequence coordination
• Directional SEF (Sensitive Earth Fault) option
• Multi-shot reclosing (79) with 79-CO cutout time detection
• Cold load inrush blocking
Metering and Recording
• Peak demand currents, watts, and VARs with time stamps
• Load profile capability: 40, 80, or 160 days (optional)
• Fault locator with distance in miles and fault resistance
• Fault summary and detailed records for last 32 trips
• Sequence of events record for last 128 operations
• Optional oscillographic storage: 64 cycles of current and voltage waveforms
– Key Features
• Accepts 5 A or 1 A secondary CT inputs
• Compatible with VT inputs at 69 V AC (Wye), 120 V AC (Delta/Open Delta), 208 V AC (Delta)
• Durable metal case for semi-flush relay panel mounting
• Patented automatic CT shorting mechanism
• Circuit breaker auxiliary contacts for logic inputs
– Typical Applications
Subtransmission and distribution system protection, industrial automation and control, load-shedding coordination, distance protection on transmission lines.
– Compatibility & Integration
The DPU2000 utilizes standard secondary current transformer and voltage transformer connections, integrating with conventional relay panel infrastructure and breaker auxiliary contact schemes.
