Rated voltage: up to 38 kV
Rated current: up to 1,250 A
Rated short circuit current: up to 31.5 kA
Minimizes inrush and ensures transient-free switching
Eliminates waiting time for capacitor discharge before reclosing
Reduces space and CAPEX in applications using power electronics (inverters, STATCOMs, SVCs)
Voltage supply: 48–230 V AC/DC
Measuring inputs: 6×1/5 A CT, 2×5/1 A CT, 1×1/0.2 A CT, 4×100–110 V VT
Digital Inputs/Outputs: 12 DI, 14 DO
Communication ports: USB, RS232, 2×RJ45
Protocols: IEC 61850, IEC 60870-5-101/103, DNP3, Modbus, EtherNet/IP, Modbus TCP master, SPAbus, RSTP, PRP
Protection functions: Underimpedance, Overfluxing, Synchro-check, Undervoltage, Directional active underpower, Field loss, Thermal overload, Overcurrent, Directional phase/earth faults, Machine differential (87M), Pole slip, Arc flash protection (No), and others
Relay Type: Differential current relay
Display: LCD 128×128 pixels with single-line diagram and ANSI symbols
Dimensions: 176×270×230 mm, Weight: 4.6 kg
Environmental protection: IP54, -40…65°C operating
Warranty: 24 months
Designed for rotor earth-fault protection in the excitation circuit of synchronous machines
Detects insulation failures caused by mechanical/thermal stress, vibration, overcurrent or poor cooling
Helps prevent dangerous second earth faults which cause magnetic unbalance and rotor damage
Useful for generators with slip rings where coal dust reduces rotor insulation resistance
REK 510 injects 100 VAC via coupling capacitors into the rotor circuit
Works with a definite-time earth-fault relay to measure the resulting current
