ABB RET620E-1G NBTNAANNNBA1BNN11G

Technical Specifications

• Electrical Parameters:
  • Rated Voltage: Up to 765 kV for transformer terminals and 110–250 V DC for auxiliary power .
  • Rated Current: Supports CT inputs up to 5,000 A with configurable ratios (1 A or 5 A secondary) .
  • Frequency Range: 47.5–63 Hz for both 50 Hz and 60 Hz systems .
• Input/Output Interfaces:
  • Analog Inputs: 16 channels for current (I) and voltage (U) measurements, supporting direct CT/PT connections .
  • Digital Inputs/Outputs: 32 DI and 16 DO with opto-isolation for breaker control, alarms, and interlocking .
  • Communication Protocols: Native support for IEC 61850 (Edition 1/2, including HSR/PRP redundancy), DNP3, Modbus TCP, and IEC 60870-5-103 for SCADA integration .
• Environmental Ratings:
  • Operating Temperature: -20°C to +70°C (-4°F to +158°F) with humidity up to 95% non-condensing .
  • Protection Class: IP66/67 for harsh environments, including corrosive conditions in power plants .
  • Vibration/Shock Resistance: Withstands 5 g (50–2,000 Hz) and 50 g (11 ms duration) shocks .
• Physical Dimensions:
  • Size: 230 mm (width) × 300 mm (height) × 130 mm (depth), weighing approximately 4.3 kg (9.5 lbs) .
  • Mounting: Rack-mountable design for easy installation in control panels .

Functional Features

1. Comprehensive Protection Suite:
   • Differential Protection: Fast-acting transformer differential (87T) with harmonic restraint and CT saturation detection, operating in <15 ms under fault conditions .
   • Earth Fault Protection:
     • High-Impedance Restricted Earth Fault: Sensitive detection (64T) for winding-to-ground faults with adjustable impedance thresholds .
     • Low-Impedance Earth Fault: Numerical-based protection for delta-wye transformers with neutral grounding .
   • Overcurrent/Undervoltage: Multi-step inverse-time overcurrent (51/50) and under/overvoltage (27/59) protection with voltage-controlled tripping .
   • Specialized Functions: Overexcitation (V/Hz) protection (49), negative sequence (46), and thermal overload (49) for power transformers .
2. Modular Configuration:
   • Three Standard Configurations:
     • A20: Basic transformer protection (12 AI, 7I + 5U) .
     • B30: Dual differential protection for generator-transformer blocks (24 AI, 9I + 3U × 2) .
     • C30: Combined transformer and feeder protection (24 AI, 9I + 3U + 6I + 6U) .
   • Field-Programmable Logic: User-configurable function blocks (e.g., timers, logic gates) for custom control sequences .
3. Diagnostics and Monitoring:
   • Self-Supervision: Continuous monitoring of internal components (CPU, memory, communication) with fault alarms and event logging .
   • Disturbance Recorder: Captures high-resolution waveform data (up to 1,000 samples/cycle) for post-fault analysis .
   • Synchrophasor Measurement: Supports PMU (Phasor Measurement Unit) functionality for grid stability analysis .
4. Advanced Control Capabilities:
   • Voltage Regulation: Automatic on-load tap changer (OLTC) control (25) with voltage/frequency matching for grid stability .
   • Apparatus Control: Direct breaker control (52) with interlocking and failure detection (50BF) .
   • Adaptive Load Shedding: Dynamic load management based on real-time power system conditions .

Application Scenarios

1. Power Generation and Transmission:
   • Thermal/Hydroelectric Plants: Protects generator-transformer blocks from faults like stator winding short circuits and rotor ground faults .
   • Substations: Ensures reliable operation of power transformers in utility and industrial distribution systems .
   • Nuclear Power Stations: Meets stringent safety requirements with redundant protection schemes and fail-safe design .
2. Industrial and Renewable Energy:
   • Mining/Manufacturing: Protects large industrial transformers in remote locations with extended temperature and humidity tolerance .
   • Solar/Wind Farms: Controls voltage and frequency stability in renewable energy systems integrated with grid-connected transformers .
3. Grid-Supporting Applications:
   • Synchronous Condensers: Maintains reactive power stability in weak grids by emulating synchronous generator behavior .
   • Microgrids: Enables seamless transition between grid-connected and islanded modes with advanced load balancing .

Operational Advantages

• Reliability: Redundant power supplies and hot-swappable modules ensure continuous operation during maintenance .
• Interoperability: Seamless integration with ABB’s Symphony Plus and third-party systems via open protocols .
• Cost Efficiency: Reduces equipment count by consolidating protection, control, and metering into a single IED .
• Lifecycle Support: Spare parts availability for 15 years post-discontinuation and firmware updates for evolving grid standards .

Key Considerations

• Installation:
  • CT/PT Connections: Requires precise phase alignment and ratio matching to avoid differential protection maloperation .
  • Cable Length: Maximum 100 m for analog signals; 200 m for digital interfaces with repeaters .
• Configuration:
  • Software Tools: ABB’s PCM600 and Relion® Manager enable graphical programming and setting customization .
  • Cybersecurity: Built-in IEC 62351-8 compliance for secure communication in smart grid environments .

*Clarification on Product Code NBTNAANNNBA1BNN11G

• Valid transformer protection relays use prefixes like RET (transformer) or REF (feeder), not NBT.
• Configuration suffixes for RET620E-1G include A20, B30, or C30 (e.g., RET620E-1G/B30), not arbitrary alphanumeric sequences.

Next Steps for Verification

1. Validate the Part Number: Cross-check the code with ABB’s official documentation, sales channels, or order records to identify missing characters or letter substitutions (e.g., H instead of N).
2. Contact ABB Directly: For critical applications, consult ABB’s technical support or regional offices to validate the code’s authenticity and request tailored product information.
3. Explore Alternatives: If the intended application involves transformer protection, consider ABB’s RET615 or RET620E-1G series, which are widely documented and supported in power systems .

Discover our other products
KEBA KEBA KeBox 12.1″ Display-Touch / 6331 + KEBA PL_RX12_DG41 + EXII Touch Cont
KEBA Keba LSN Servomotor with Brake 0.59kW RPM=3000 Keba LSN-074-0205-3 0-320/T1MBS4
KEBA KEBA PS 240 PS240/A 2134-00393 PS 240/A 24633 90days warranty via DHL or FedEx
KEBA KEBA Power Supply E-PS-24V 1825E-1 Used #120347
KEBA KEBA Power Supply E-PS-24V 1825C-1 Used #100100
KEBA KEBA Power Supply E-PS-24V 1825E-1 Used #117934
KEBA ENGEL KEBA HT2/SUVA/SS A/20678/21 ROBOT CONTROLLER
KEBA 1pc NEW KEBA KeTop JB001/A Set Gateway Module Via FedEx or DHL
KEBA KEBA CR 041 / 24680
KEBA KEBA PS 240 PS240/A 2134-00393 PS 240/A 24633 90days warranty via DHL or EMS