Parameters Category Parameter Specification / Interpretation for OTM80F3C10D380C General Product Series OTM80 (Optimax Series - Distance Protection) Device Class Numerical Distance & Line Differential Protection Relay Housing 4U high, 19-inch rack or flush panel mounting (Typical) Power Supply Operational Voltage 48-125 V DC or 110-250 V DC (Inferred from "C10") Power Consumption Typically < 35 W Analog Inputs Current Inputs (Iₙ) 1 A or 5 A (Secondary) Voltage Inputs (Uₙ) 100/√3 V or 110/√3 V for phase-to-ground; 100 V or 110 V for phase-to-phase (via VTs). Digital I/O Binary Inputs (BI) Typically ≥ 20 (High-voltage, optically isolated) Binary Outputs (BO/PO) Typically ≥ 12 (Including high-speed trip relays) HMI Display Large Graphical Color LCD/TFT (High-resolution, for "D" variant) Interface Front keypad, navigation wheel, USB port. Communication Primary Protocol IEC 61850-8-1 (Edition 2) (MMS & GOOSE) Teleprotection Protocols IEC 60870-5-103 (FT3), DNP3 for teleprotection links. Other Protocols Modbus TCP/RTU. Physical Ports 2-4 Ethernet ports (Copper & Optical SFP), Multiple serial ports (RS485/RS232). Core Protection Functions Distance Protection Zones: Up to 6 zones (Ph-Ph & Ph-G). Characteristics: Mho, Quadrilateral, Load-encroachment. Timing: Z1: < 20 ms (typical). Communication Schemes POTT, DCB, PUTT, DUTT, Current Differential (via teleprotection). Backup Protection 67/67N, 50/51/51N, 50BF (CB Fail), 27/59, 79 (Recloser), 25 (Sync). Metering & Records Measurements I, V, P, Q, S, PF, F, Z (Impedance), Sequence Components. High Accuracy (Class 0.5). Recording Transient Fault Recorder (TFR): ≥ 16 analog channels, ≥ 64 digital channels, 1-4 kHz sampling. SOE, Trip Log, Disturbance Recorder. Logic & Control Programmability CFC (IEC 61131-3) for custom logic and automation. Environmental Operating Temperature -25°C to +70°C (Standard) / -40°C to +70°C (Extended) Protection Degree IP52 (Front), IP20 (Terminals) Standards Compliance IEC 60255, IEC 61850, IEEE C37.90, IEC 61000-4 (EMC).