Technical Parameters Parameter Category Specification Product Series / Platform ABB Relion® 615 Series (Transformer Protection Platform) Device Type Numerical Transformer Protection and Control Relay (IED) Hardware Variant Suffix • -E: Wide-range auxiliary power supply (e.g., 48-250V DC / 48-240V AC). • -1G: Specific hardware package defining the number and type of I/O modules, communication ports, and possibly analog input configurations. 1G often indicates a standard or common configuration for transformer applications. Key Standards IEC 60255, IEC 61850 (Ed. 2), IEC 60870-5-103 Rated Auxiliary Supply (Us) 48 - 250 V DC / 48 - 240 V AC, 50/60 Hz (Auto-ranging, typical for -E). Analog Inputs (Typical) Designed for Dual-CT Sets: • HV Side: 3 phase currents (I1, I2, I3) + 1 neutral current. • LV Side: 3 phase currents (I4, I5, I6) + 1 neutral/ground current. • Configurable for 1 A or 5 A secondary. • Voltage Inputs: 3 phase voltages (for HV or LV side metering/protection) + 1 residual voltage. Core Protection Functions Transformer-Specific Suite: • Differential Protection (87T): High-impedance or percentage restrained, with harmonic restraint for inrush and overexcitation. • Restricted Earth Fault (REF) Protection (87N): For both HV and LV windings. • Overcurrent Protection (50/51, 50N/51N): Backup protection for HV and LV sides. • Thermal Overload Protection (49): For transformer winding and oil. • Over/Under Voltage (27/59) & Frequency (81). • Buchholz & Sudden Pressure Relay Interface. • Circuit Breaker Failure (50BF). Control & Automation • Integrated Bay Control: For HV and LV circuit breakers, isolators, and tap changers. • Programmable Logic (CFC): Extensive logic for interlocking, sequencing, and automation. • Voltage-based Auto-Reclosing (79) and Synchronization (25). Measurement & Metering High-accuracy (Class 0.5) measurement of currents, voltages, power (P, Q, S), power factor, frequency, energy, and harmonics on both sides of the transformer. Human-Machine Interface (HMI) • Large graphical LCD. • Intuitive keypad. • Status LEDs. • Front USB port. Data Recording • Event Recorder (≥ 2000 events). • Disturbance Recorder (Multiple analog and binary channels). Communication Interfaces As per -1G package, typically includes: • Multiple Ethernet ports for IEC 61850-8-1 (GOOSE/MMS) and station bus. • RS485 serial port(s) for legacy protocols (IEC 60870-5-103, Modbus RTU). (Exact ports depend on the -1G definition). Time Synchronization IRIG-B, SNTP, PTP (IEEE 1588) support. Operating Temperature -40°C to +70°C (Extended range, typical for -E version). Mounting Panel-mounted. Configuration Software ABB PCM600. Typical Applications Protection of two-winding power transformers in: • Utility transmission and distribution substations. • Industrial plants (steel, cement, mining). • Renewable energy plants (solar, wind farm step-up transformers). • Data centers and critical infrastructure.