ABB 1MRK002816-AG RET670 Transformer Protection IED Module

Product Overview

Core Electrical Specifications

Rated Input Signals

• CT secondary rated current: 1 A / 5 A switchable
• VT secondary rated voltage: 100 / 110 V
• System frequency: 45–55 Hz (50Hz) / 55–65 Hz (60Hz) wide operating range

Power Supply

• Operating power: 24–250 V DC or 100–240 V AC universal dual-range power supply
• Power consumption: Max 35 W under full load

Protection Performance

• Differential operating time: ≤20 ms for internal transformer faults
• Measurement accuracy class: 0.5S for current/voltage sampling
• Harmonic restraint: 2nd harmonic block for inrush current, 5th harmonic block for overexcitation

I/O Resources

• Analog input channels: Multi-group CT/VT sampling inputs for HV, LV and tertiary windings
• Binary inputs: 24–220 V DC configurable status acquisition for circuit breakers, tap changers, cooling fans
• Binary trip/output relays: High-power force-guided trip contacts for breaker tripping, alarm and interlock signals

Communication Interfaces

• Dual Ethernet ports supporting IEC 61850 MMS/GOOSE/SMV
• Serial interfaces: SPA, LON, Modbus RTU, DNP3 for legacy SCADA integration
• Front panel USB port for local configuration, fault data downloading and firmware upgrade

Mechanical & Environmental Parameters

• Mounting: Standard 19-inch rack flush mounting for substation control cabinets
• Overall dimensions (W×H×D): 265.9 × 223.7 × 242.1 mm
• Net weight: ~10 kg
• Protection grade: IP20 for indoor control room installation
• Operating temperature: -25 °C ~ +55 °C
• Storage temperature: -40 °C ~ +85 °C
• Humidity: 5%–95% non-condensing
• Compliance standards: IEC 60255, IEC 61850, IEEE C37, CE, KEMA certified

Integrated Protection & Control Functions

1. Percentage Restrained Transformer Differential Main Protection

    

   Low-impedance differential algorithm with multi-restraint CT inputs (up to 6 CT groups) to detect internal winding short circuits. Built-in second-harmonic blocking avoids false tripping during transformer energization inrush; fifth-harmonic restraint prevents misoperation under core overexcitation conditions. Sensitive negative-sequence differential logic identifies low-level inter-turn faults.
2. Comprehensive Backup Electrical Protection

• Multi-stage phase overcurrent / inverse time overcurrent
• Sensitive restricted earth fault (REF) protection for winding ground faults
• Overvoltage, undervoltage, negative-sequence voltage unbalance protection
• Instantaneous short-circuit high-set overcurrent
• Overexcitation/V/Hz protection to prevent core saturation damage

3. Transformer Thermal & Condition Monitoring

    

   IEEE/IEC standard dual thermal models for winding hot-spot and oil temperature calculation. Supports PTC thermistor input, DGA gas relay signal acquisition and partial discharge monitoring interfaces to track insulation aging and avoid overload burnout.
4. Integrated Transformer Auxiliary Control

    

   Automatic tap changer regulation, cooling fan/pump group logic control, circuit breaker close/trip interlock, local/remote mode switching and autoreclose sequence control for transformer feeders.
5. High-Capacity Fault Recording & Event Logging

    

   Built-in high-speed disturbance recorder captures full-cycle voltage/current waveforms during faults; 10,000+ event records store protection operation timestamps, breaker status and alarm logs for post-fault root cause analysis.
6. Substation Automation System Integration

    

   GOOSE peer-to-peer fast inter-tripping between bay IEDs; IEC 61850 MMS data upload to ABB 800xA DCS or third-party SCADA systems for remote monitoring, parameter setting and fault alarm push.

Key Advantages

• Modular software function licensing, users activate only required protection algorithms to cut engineering cost
• Wide frequency tolerance ensures stable operation during generator startup and grid disturbance fluctuations
• Dual redundant Ethernet communication supports substation ring network architecture with seamless fault switching
• Graphical multilingual LCD front panel provides local parameter viewing, manual operation and fault code display without external HMI
• High anti-interference hardware design adapts to harsh EMC substation electromagnetic environments
• Unified RELION 670 toolbox software for one-time configuration, test and batch firmware upgrade
• Compliant with global power grid safety standards, applicable for utility power plants, transmission substations and large industrial self-owned power stations

Typical Applications

• Two/three-winding main transformer protection in 35kV–220kV power transmission substations
• Generator step-up transformer protection in thermal/hydro power plants
• Auto-transformer and phase-shifting transformer protection
• Large industrial factory high-voltage distribution transformers
• Railway traction substation special transformer protection
• Shunt reactor combined protection & monitoring
• Retrofit upgrade replacement for aging legacy transformer protection relays