ABB REX521GHHPSH51G protection relay

ABB REX521GHHPSH51G protection relay

Specific Parameters

• Electrical ParametersSupply Voltage: Three options of 48V DC/110V DC/220V DC, supporting stable operation at 80%-115% rated voltageAnalog Inputs: 5 current inputs (configurable rated current 1A/5A, measurement range 0.1-5In), 1 voltage input (rated voltage 100V/220V)Digital I/O: 9 isolated digital inputs (24V DC, response time ≤1ms), 4 high-power relay outputs (PO), 2 signal outputs (SO)Output Capacity: PO output continuous current 5A, 0.5s overload 30A, 3s overload 15A; SO output continuous current 5A, 0.5s overload 10ACommunication Interfaces: 3 fiber optic communication ports (1 front, 2 rear), supporting LON/IEC/SPA protocols, communication rate 56/64kbit/sProtection Functions: Three-stage overcurrent protection (definite/inverse time optional), directional earth fault protection, phase loss protection, inrush current blocking, cable overheating protection, 5 automatic reclosing operations (configurable interval 0.05-300s)Measurement Functions: Three-phase current/voltage RMS, power factor, active/reactive power, 1-13th harmonic analysis (THD measurement accuracy ±0.5%)
• Environmental ParametersOperating Temperature: -25°C to 70°C (non-condensing, no derating during startup from -25°C to 0°C)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 61000-4-2/3/4/5 standards, ESD protection ±15kV (air discharge), ±8kV (contact discharge), surge protection 4kV (common mode)/2kV (differential mode)Vibration Resistance: 10-500Hz, 1.5g acceleration (IEC 60068-2-6 standard, 2 hours test for X/Y/Z axes each)Certification Standards: CE certification (EMC and safety), IEC 60255 series protection relay standard certification
• Mechanical ParametersDimensions: 60mm (W) × 144mm (H) × 175mm (D) (19-inch 1/3 rack standard size)Weight: Approximately 1.8kg (including terminals)Mounting Method: 19-inch standard rack snap-on mounting, compatible with 35mm DIN rail adapter mountingHousing Material: Flame-retardant reinforced PA66 plastic (UL 94 V-0 grade, oil-resistant, weak acid and alkali resistant)Indicators: 3 bi-color LED indicators — green steady on (normal operation), yellow blinking (protection blocking/alarm), red steady on (trip action)

Product Performance

The module’s logic processing cycle is ≤10ms, and the protection action response time is ≤50ms (when overcurrent fault current ≥2×set value), which can quickly isolate fault areas and prevent fault expansion. The analog measurement accuracy reaches ±0.5% full scale, the frequency measurement range is 45-65Hz, and the accuracy is ±0.01Hz, meeting the high-precision requirements of power systems for measurement data.

It supports “select-before-operate” safety control logic. During reclosing, it automatically detects fault nature (permanent/transient), with transient fault reclosing success rate ≥95%; built-in Lockout self-holding function, which locks reclosing after permanent fault tripping to prevent secondary damage to equipment.

The event recording resolution is 1ms, capable of storing 1000 sequence of events records (SER) and 50 disturbance recording data (maximum recording duration 3.4s). Fault information is uploaded to the background system in real time via fiber optic communication, supporting remote fault tracing and analysis. The built-in comprehensive self-diagnosis module can diagnose 18 types of abnormalities such as power supply abnormality, communication interruption and I/O channel fault, with diagnostic coverage ≥99%. When a fault occurs, it triggers local alarm and remote signal upload.

The device’s Mean Time Between Failures (MTBF) is ≥1,000,000 hours (MIL-HDBK-217F, 25℃ environment), supporting online parameter setting and configuration modification. Parameters are stored in non-volatile EEPROM, and data is retained for ≥10 years after power failure, no backup battery required.