Description
ABB REF543KM127AAAA Feeder Terminal Protection Control Device
[Product Positioning]
REF543KM127AAAA is ABB RELION ® The feeder terminal products in the series belong to the core compartment level equipment of ABB substation automation systems. Model interpretation: REF543 is a feeder terminal series, K represents the switchgear panel installation type (Kabinett), M represents the highest functional level of Multi, 127 is the hardware version, and 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 compact 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 REF543 REF543KM127AAAA
[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, REF543KM127AAAA also provides a large number of PLC programmable logic functions, 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, fully configured)
Overcurrent protection: Three phase non directional overcurrent (50/51, low setting value+high setting value 50/51B), instantaneous overcurrent (50/51B), directional overcurrent (67). Supports timed and inverse time characteristics (IDMT), IEC, ANSI standard curves.
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: Low frequency (81U), high frequency (81O), frequency change rate (ROCOF), programmable action time.
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.
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.
I/O configuration (Multi level, KM127 version)
Digital input: 25 DI (configurable as alarm, event, timing logic, contour step waiting logic, etc.), 2 trip circuit monitoring inputs.
Digital output: 18 outlet relays (5 NO single poles+5 NO/NC+2 signal outputs NO+1 self-monitoring output+others), a total of 18 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, adaptive).
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 (trial)+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.
Supporting protocols: SPA bus protocol, LON bus protocol, IEC 60870-5-103 protocol, supports IEC 61850 through SPA-ZC 400, supports Profibus DPV1 protocol through SPA-ZC 302 DNP 3.0、Modbus RTU/TCP。
The RS485 interface supports adaptive baud rates of 1200-115200bps and is compatible with the IEC 60870-5-101/104 protocol.
IRIG-B time synchronization interface ensures precise alignment of all station events.
[Physical Specifications]
Dimensions: 120mm x 80mm x 30mm (width x height x depth, embedded installation), net weight approximately 0.8kg.
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.
Working temperature range: -25 ° C to+70 ° C (industrial grade), storage temperature -40 ° C to+85 ° C.
Auxiliary power supply: 48-250 V DC/100-240 V AC (adaptive wide range input), typical power consumption standby<2W, operation<5W.
Fanless design, no electrolytic capacitors, no moving parts, normal coating coated board, maintenance free long-term operation.
[Human Computer Interface]
3.5-inch TFT LCD display screen (320 × 240 pixels, 65K colors), LED white backlight (adjustable brightness, supports night mode).
Input method: resistive touch screen+4 function buttons (confirm/return/up/down).
Indicator light: 3 x LED (RUN/ERROR/COMM status).
Built in Chinese and English menus, expandable to other language packs.
Support MIMIC screen, event record query, measurement value viewing, and on-site parameter modification.
Programming and Configuration
Use ABB CAP505 relay configuration tool for protection setting, PLC logic editing, and MIMIC screen configuration. Support offline simulation verification, and confirm the correctness of protection settings and logic before powering on. Supports programming in the IEC 61131-3 standard functional block language. Function block naming options: ANSI device number, IEC symbol, or ABB naming.
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. Automatically trigger an alarm when the module fails, and output diagnostic information through LED indicator lights and serial port.
[Typical Application]
Medium voltage feeder protection: feeder overcurrent, grounding, and reclosing protection for 10kV-35kV radial or ring network distribution systems.
Protection and control of capacitor banks: switching control and unbalanced protection of reactive power compensation parallel capacitor banks.
Motor protection: Start monitoring, thermal overload, and locked rotor protection for medium-sized three-phase asynchronous motors.
Substation automation: Integration of compartment protection, measurement, control, and communication, replacing multiple independent devices.
Suitable for single bus, double bus, and double switch wiring methods, supporting various network types such as neutral ungrounded, resonant grounded, and low resistance grounded.
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.
Comparison with the same series
REF541KB115AAAA: Basic (B) grade, 15DI/13DO, suitable for medium complexity applications such as feeder protection.
REF541KM118AAAA: Multi (M) level, 25DI/19DO, with the richest I/O and most complete protection functions.
REF542: Simplified version, cost sensitive basic feeder monitoring.
REF543KM127AAAA: Multi (M) grade, 25DI/18DO, with motor protection and feeder protection as the core, strong PLC capability, suitable for occasions requiring rich logic control (this product).
REF545: Dual winding transformer differential protection package, with the richest I/O, suitable for large substations.
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, IEC 61000 series electromagnetic compatibility standards IEC 61850、CE、cULus、UL 508。 HS code 853701190.
