Parameters Category Parameter Specification / Interpretation for 1SDA066325R1 General Functional Model REF615 Feeder Protection Relay Product Line Relion® 615 Series Hardware Level Likely "E" (Enhancement) Level Order Code Type Configured Spare Part / Complete Unit Power Supply Operational Voltage Likely 110-250 V DC (Common for substation battery) or 110-230 V AC. Analog Inputs Rated Current (In) 1 A or 5 A (secondary, defined by order code). Continuous Thermal Withstand 4 x In Voltage Inputs (VTs) 100-120V or 190-230V line-to-neutral. Digital I/O Binary Inputs (BI) Typically 16 (configurable in voltage groups). Output Relays Typically 6 Trip/Close (PO) + 8 Signal (BO). Human-Machine Interface Display High-resolution Graphical LCD. Local Control Keypad with navigation buttons. Communication Primary Protocol IEC 61850-8-1 (MMS & GOOSE) Included Protocols DNP3 (TCP/IP & Serial), Modbus RTU, IEC 60870-5-103. Physical Ports 2 x Ethernet (RJ45 + Optical SFP), 2 x RS485. Protection Functions Core ANSI Functions 67/67N (Dir. OC/EF), 50/51/51N, 27/59, 79 (Recloser), 49 (Thermal), 81U/81O, 50BF. Metering Measurements I, V, P, Q, S, PF, F, Energy (Wh, varh) – Class 0.5. Power Quality Harmonics (up to 15th), THD, unbalance. Recording Disturbance Recorder Oscillographic (≥ 8 analog channels, 128 samples/cycle). Event Log (SOE) ≥ 1024 time-tagged events. Trip Log Last 256 faults with details. Logic & Control Programmability CFC (IEC 61131-3) & Sequence Control. Environmental Operating Temperature -25°C to +70°C (standard). Protection Degree IP40/IP52 (panel mounted). Standards Compliance IEC 60255, IEC 61850, IEEE C37.90, IEC 61000-4 (EMC).