ABB REL561 1MRK002496-AC Microcomputer longitudinal differential protection terminal

ABB REL561 1MRK002496-AC Microcomputer longitudinal differential protection terminal

Specific Parameters

• Electrical ParametersSupply Voltage: Wide-range input of 36-125V DC, supporting stable operation at 80%-115% rated voltagePower Consumption: ≤25W under normal operation, ≤35W under maximum loadAnalog Inputs: 10 analog inputs, including 5 current inputs (configurable rated current 1A/5A) and 5 voltage inputs (rated 100-125V)Digital I/O: Expandable to 24 isolated digital inputs (24V DC), 8 relay outputs (250V AC/DC, 5A continuous current-carrying capacity)Communication Interfaces: 1 fiber optic communication interface (56/64kbit/s, HDLC protocol), 1 RS-485 serial port, 1 Ethernet interfaceSupported Protocols: IEC 61850 Ed.1, Modbus RTU, High level Data Link Control (HDLC)Isolation Level: Isolation voltage ≥2500V AC (1min) between input/output and system circuits, insulation resistance ≥100MΩ (500V DC)Protection Functions: Phase-segregated current differential protection, phase-to-phase/earth distance protection (Zone Ⅰ/Ⅱ/Ⅲ), definite/inverse time residual overcurrent protection, CT circuit supervision, fuse failure supervision, breaker failure protection, automatic reclosing
• Environmental ParametersOperating Temperature: -40°C to 70°C (non-condensing)Storage Temperature: -40°C to 85°CRelative Humidity: 5% to 95% (non-condensing, continuous operation for 168 hours at 90% humidity and 40°C without failure)EMC Immunity: Complies with EN 61000-4-2/3/4 standards, ESD protection ±15kV (air discharge), ±8kV (contact discharge)Vibration Resistance: 10-500Hz, 1.5g acceleration (IEC 60068-2-6 standard, 2 hours for X/Y/Z axes each)Certification Standards: CE certification (EMC and safety), IEC 61850 compatibility certification
• Mechanical ParametersDimensions: 144mm (W) × 144mm (H) × 175mm (D) (3/4 standard rack size)Weight: Approximately 2.5kgMounting Method: 35mm DIN rail mounting or 19-inch rack fixingHousing Material: Flame-retardant reinforced plastic (UL 94 V-0 grade)Operation Interface: Built-in monochrome LCD Man-Machine Interface (MMI) supporting setting configuration and fault data queryIndicators: Bi-color LED indicators, green steady on for normal operation, red blinking for protection blocking or fault

Product Performance

The device has a logic processing cycle of 5ms, transmitting three-phase current phasor data to the opposite terminal every 5ms, including CT saturation detection and clock synchronization information. The phase-segregated differential protection operation time is ≤28ms (when differential current ≥2×set value), and the distance protection Zone Ⅰ operation time is ≤40ms, enabling rapid isolation of internal faults.

Current measurement accuracy is ≤±2.5% rated current (IN), voltage measurement accuracy ≤±2.0% rated voltage, frequency measurement range 45-65Hz with accuracy ±0.01Hz. It supports 1-13th harmonic analysis with total harmonic distortion (THD) measurement accuracy ±0.5%.

Event recording resolution is 1ms, capable of storing 500 sequence of events records (SER) and 50 disturbance recording data with maximum duration of 3.4s. Fault information is bidirectionally synchronized via fiber optic channel. Built-in intelligent diagnosis module can detect 15 types of faults including communication interruption, CT disconnection and power abnormality, with diagnostic coverage ≥99%. Mean Time Between Failures (MTBF) is ≥1,000,000 hours (25℃ environment).