Description
ABB REF541KM118AAAA Terminal protection control device
ABB REF541KM118AAAA Feeder Terminal Protection Control Device
[Product Positioning]
REF541KM118AAAA is ABB RELION ® The highest functional level (Multi, M-level) feeder terminal in the series belongs to the core bay level equipment of ABB substation automation system. Model interpretation: REF541 is a feeder terminal series, K represents the switchgear panel installation type (Kabinett), M represents the highest functional level of Multi, 118 is the hardware version (belonging to the 115/118/127/129/133 series), AAAA represents the configuration of auxiliary power supply and current input. This device integrates multifunctional protection, programmable logic control, measurement monitoring, and multi protocol communication into a single 250mm wide panel mounted chassis. It is a digital integrated alternative to traditional electromechanical relays, independent protection devices, PLCs, and communication gateways, targeting medium voltage distribution system scenarios that require high reliability protection and interval automation.
ABB REF541KM118AAAA Terminal protection control device
[Core Function]
This device simultaneously undertakes tasks such as feeder protection, transformer protection, motor protection, capacitor bank protection, measurement monitoring, and sequence control. Built in dual processor architecture: one processor is dedicated to ultra fast protection algorithms (with a trip time of less than 16 milliseconds), while the other processor manages communication, HMI interaction, and data recording, without preempting resources. The protection function blocks are independent of each other, each with its own set of fixed values and data records, and do not affect each other. In addition to protection, measurement, control, and status monitoring, REF541KM118AAAA also provides PLC programmable logic capacity for 200 IEC 61131-3 functional blocks, which can integrate the automation and sequential logic control required for substation automation into one device, greatly reducing the need for on-site hard wiring. The combination of LON communication and PLC can significantly reduce the need for hard wiring between feeder terminals.
Protection function (Multi level, most complete configuration)
Overcurrent protection: Three phase non directional overcurrent (50/51, low setting value+high setting value 50/51B), instantaneous overcurrent (50/51B), directional overcurrent (67).
Ground fault protection: Non directional and directional ground fault protection (50N/51N/67N), suitable for effective grounding, resonant grounding (arc suppression coil), and low resistance grounding networks.
Voltage protection: overvoltage (59), low voltage (27), residual voltage (59N), voltage imbalance (46), frequency protection (81O/U, low-frequency/high-frequency/frequency change rate ROCOF).
Thermal Overload Protection (49): Three phase thermal overload and current imbalance protection, supporting cable thermal overload model (TOL3Cab).
Automatic reclosing (79): supports synchronous and no voltage detection functions.
Circuit breaker failure protection (50BF): backup protection.
Motor protection: Negative sequence imbalance, locked rotor, load loss, reverse protection, start time monitoring, stall protection.
Capacitor protection: current imbalance protection, overvoltage protection, unbalanced current protection (COPFC).
Transformer protection (M-class specific): three-phase steady-state differential protection (including second harmonic braking and fifth harmonic braking), three-phase overcurrent, undirected grounding, restrictive grounding, transformer thermal overload, phase imbalance protection.
Fault recording: 16 analog input channels+16 switch channels, 50Hz system sampling frequency 2kHz, 60Hz system 2.4kHz, COMTRADE format, record the last 100 events.
Measurement and Power Quality
Measure three-phase current, zero sequence current, three-phase voltage, zero sequence voltage, frequency, active power, reactive power, power factor, and electrical energy (kWh/kvarh). Supports pulse counting input (7 pulse counting input ports). Support RTD/analog module expansion. Total Harmonic Distortion (THD) measurement, with 3-second and 10 minute averages, ranging from 0% to 120%. Measure the harmonic components up to the 13th harmonic. Instantaneous voltage change monitoring (voltage sag, transient rise, instantaneous interruption), in accordance with IEC 61000-4-30 standard.
I/O configuration (Multi level)
Digital input: 25 DI (configurable as alarm, event, timing logic, contour step waiting logic, etc.), 2 trip circuit monitoring inputs.
Digital output: 19 DO (5 NO unipolar+5 NO/NC+2 signal outputs NO+1 self-monitoring output+others), a total of 19 outlet relays.
Analog input: 9 sensor channels (can be connected to Rogowski coils or voltage sensors)+9 matching transformer channels (CT1-CT5, VT1-VT4), channel 1 only supports sensors, and channel 6 only supports matching transformers.
Voltage input: 3 × 100-690 V AC (configurable).
Current input: 3 × 1 A/5 A (software optional).
All channels are provided with electrical isolation, which can effectively suppress common mode spike interference of the frequency converter.
[Communication Interface]
Three communication interfaces: 1 RS-232 local communication+2 dual port communication (can simultaneously connect to substation communication system and monitoring system).
Dual Ethernet ports: 100BASE-FX fiber optic or 1000BASE-T copper cable, supporting redundant ring topology, providing IEC 61850-8-1 GOOSE peer-to-peer tripping and MMS SCADA integration.
Supported protocols: IEC 61850 2nd edition (via SPA-ZC 400 adapter), Modbus TCP/RTU, SPA bus, LON bus, IEC 60870-5-103, DNP 3.0, Profibus DPV1 (via SPA-ZC 302 adapter).
IRIG-B time synchronization interface ensures precise alignment of all station events.
The front panel is equipped with a USB-C port, which supports configuration file cloning and quick debugging.
[Physical Specifications]
Dimensions: 250 mm x 200 mm x 110 mm (width x height x depth), net weight approximately 2.1 kg.
Installation method: 35mm DIN rail, panel installation, compatible with standard switchgear openings, 110mm depth can remove most of the existing cuts left by traditional electromechanical relays.
Front panel protection level: IP54 (rear panel IP20), suitable for flushing environment.
Operating temperature range: -40 ° C to+70 ° C (IEC 60068-2-1/2), storage temperature -40 ° C to+85 ° C.
Auxiliary power supply: 48-250 V DC/100-240 V AC, typical power consumption ≤ 15 W.
Fanless design, no electrolytic capacitors, no moving parts, normal coating coated board, maintenance free long-term operation.
[Human Computer Interface]
Fixed graphic LCD display screen, 19 line graphic display, supports MIMIC screen, event record query, measurement value viewing, and on-site parameter modification. The front panel is equipped with: 3 protection LED indicator lights, 8 programmable alarm LEDs (different colors and modes), control interlock LEDs, 3 buttons for object control (I/O/object selection), 4 arrow buttons+clear/confirm button, and remote/local control switching button. Support password level protection (password 1 controls location, password 2 parameter setting, password 3 is read-only).
Programming and Configuration
Use ABB CAP505 relay configuration tool for protection setting, PLC logic editing, and MIMIC screen configuration. Support offline simulation verification. Function block naming options: ANSI device number, IEC symbol, or ABB naming. Supports programming in the IEC 61131-3 standard functional block language.
Self diagnosis and predictive maintenance
The device continuously self monitors internal faults, CT saturation, and configuration drift, and reports its health status directly to the control center. Record contact thermal stress, circuit breaker wear cycle, and VT/CT integrity to provide data support for predictive maintenance. The LCD “Health” LED indicates the status of the device.
[Typical Application]
Public utility substation: 10kV~35kV feeder overcurrent, grounding fault, reclosing protection, output measurement values to DMS through IEC 61850.
Industrial plant: 6.6kV~13.8kV motor protection, capacitor bank protection, using undervoltage level to deal with voltage drops caused by large equipment startup.
Wind farm/photovoltaic power station collection room: measures grid frequency and voltage, prevents turbine reconnection until voltage and frequency windows are met.
Offshore platforms/vessels: dock pump protection, thermal overload model predicts stall state, and starts backup pumps in advance.
Continuous production scenarios such as paper mills: GOOSE messages directly trigger circuit breakers, reducing fault clearance time from 50ms to 35ms to prevent product scrap.
Comparison with the same series
REF541KB115AAAA: Basic (B) grade, 15DI/13DO, suitable for medium complexity applications such as feeder protection.
REF541KM118AAAA: Multi (M) grade, 25DI/19DO, with the richest I/O and most complete protection functions, suitable for large substations or complex automation needs (this product).
REF543: A variant centered on motor protection with rotor locking function.
REF545: Dual winding transformer differential protection package, with the richest I/O.
REX521: Economical feeder relay that does not require IEC 61850.
The four have the same electrical core, compatible software, and can be selected as needed. Hardware versions 115/118/127/129/133 are electrically compatible and firmware can be upgraded.
Certification and Standards
Compliant with IEC 60255-151, -27, -5, IEC 61000 series electromagnetic compatibility standards, IEC 61850, CE, cULus, UL 508, DNV marine certification. HS code 853701190.
