REF543KM127BAAA ABB DCS Feeder‑Motor Protection Terminal

• Brand
  ABB
• Model
  REF543KM127BAAA
• Product Name
  Medium‑voltage Feeder‑Motor Protection Terminal
• Dimensions
  263 mm height, 224 mm width, 235 mm depth
• Weight
  7.7 kg
• Place of Origin
  Finland
• HS Code
  85364900
• Operating Temperature
  ‑25 ℃ to +55 ℃
• Storage Temperature
  ‑40 ℃ to +85 ℃
• Power Supply
  110‑240 V AC/DC
• Warranty
  12month
• Status
  new brand

REF543KM127BAAA is a multifunctional Feeder‑Motor Protection Terminal from ABB REF543 series, designed for integration within DCS substation automation systems. Combining protection, measuring and breaker control in single compact unit, it is widely adopted in power utilities, process plants and heavy‑industry medium‑voltage distribution networksABB Group

ABB REF543KM127BAAA Technical Specification

Device Type: Medium-Voltage Feeder Protection, Control, Measurement and Supervision Terminal

1. Inputs

Analogue Inputs: Equipped with 3-phase current inputs, residual current input, 3-phase-to-neutral voltage inputs and residual voltage input. Compatible with conventional CT/VT, current sensors and voltage dividers, and supports optional RTD temperature measurement inputs.

Binary Digital Inputs: Features 27 galvanically isolated digital status inputs, applied for breaker position monitoring, interlock signal acquisition, external trip and alarm signal detection.

Optical Input: Integrated arc-flash sensor optical input to realize high-speed arc fault detection.

2. Outputs

Binary Digital Outputs: Provides 17 programmable relay contact outputs for breaker tripping and closing, alarm indication, interlock control and fault signalling, with built-in trip circuit supervision function.

Indicator Outputs: Programmable front-panel LED indicator outputs for on-site status display.

Optional Output Module: Supports extended analogue mA output module for analogue signal transmission.

3. Communication Protocols

Native protocols: SPA bus, LON bus, IEC 60870-5-103, DNP3.0, Modbus RTU. Extended protocols: IEC 61850 (via SPA-ZC400 adapter), Profibus-DPV1 (via SPA-ZC302 adapter).

4. Compatible Configuration Software

Relay Configuration Tool: Used for protection parameter setting, IEC 61131-3 based CFC logic programming and overall device parameter configuration.

Relay Mimic Editor: Applied for HMI mimic diagram design, alarm text editing and front-panel LED indicator configuration.

Relay Download Tool: Dedicated for uploading and downloading device project configurations and program files.

PCM600: Professional ABB configuration and management software for the entire REF54 series protection relays.

5. Compatible SCADA & Host Systems

ABB Native System: MicroSCADA Pro substation automation system.

Third-Party Systems: All mainstream SCADA systems that support IEC 60870-5-103, DNP3.0, Modbus and IEC 61850 communication protocols.

Gateway Compatibility: Supports COM600 communication gateway for cross-protocol conversion and seamless system integration.

Standard Wiring Methods

1 General Wiring Rules

All wiring construction shall be implemented in full compliance with IEC substation installation specifications. High-power power cables, analog signal cables and digital control cables shall be routed separately to eliminate electromagnetic interference (EMI). All weak signal circuits and communication circuits shall adopt shielded twisted-pair cables with a single-end shield grounding scheme. All wire ends shall be fitted with ferrule terminals to ensure stable and reliable terminal connections, and adequate wiring margin shall be reserved to facilitate subsequent equipment maintenance and commissioning.

2 Analogue Signal Wiring (CT/VT & RTD)

Current Transformer (CT) Wiring

The secondary circuits of three-phase current transformers and residual current transformers shall be connected to X2 series analog terminals. Wiring shall strictly follow the polarity principle, with P1 as the incoming terminal and P2 as the outgoing terminal, to avoid reverse connection, protection malfunction and measurement errors. The CT secondary side shall be reliably grounded at all times and open-circuit operation is strictly prohibited.

Voltage Transformer (VT) Wiring

Secondary signals of three-phase line-to-neutral voltage and residual voltage transformers shall be connected to dedicated analog voltage terminals. Phase voltage and line voltage wiring shall be distinguished in accordance with the actual power grid configuration to ensure accurate metering and valid execution of voltage protection logic. The VT secondary side shall be equipped with short-circuit protection and reliable grounding facilities.

 RTD Temperature Wiring

For the optional temperature measurement function, RTD temperature sensors shall be connected to reserved analog temperature terminals via dedicated shielded low-resistance signal cables, so as to ensure high-precision temperature data sampling.

3 Digital Input & Output Wiring

 Binary Input Wiring

The device is equipped with 27 galvanically isolated digital input terminals, which are used to access external status signals including circuit breaker position, interlock status, external tripping and alarm signals. Isolated control cables shall be adopted to enhance anti-interference performance, and the wiring shall strictly match the voltage level of external DC/AC signals.

 Binary Output Wiring

A total of 17 programmable relay contact outputs are provided for circuit breaker tripping, closing, alarm output and interlock control. The tripping circuit supports loop monitoring wiring. Field wiring shall be implemented according to the on-site control logic, and external fuse protection shall be configured for tripping and closing loops to prevent equipment damage caused by overload.

4 Arc-Flash Optical Wiring

Arc-flash detection optical input adopts dedicated optical fiber wiring. Matched BNC shielded optical connectors (AMP 332225 or Amphenol 31-224) shall be used for connection. All connectors shall be firmly plugged in, and optical fibers shall be prevented from excessive bending and stress, ensuring fast, stable and reliable acquisition of arc fault signals.

5 Communication Wiring

SPA / LON Bus Wiring

Standard shielded twisted-pair cables shall be used for SPA and LON bus communication. Wiring shall comply with standard bus topology rules, and single-end grounding shall be applied to cable shielding layers.

Industrial Protocol Wiring

Shielded twisted-pair differential signal wiring shall be adopted for Modbus RTU, DNP3.0 and IEC 60870-5-103 protocol communication. For extended communication of IEC 61850 and Profibus-DPV1, adapter wiring shall be completed in accordance with SPA-ZC400 and SPA-ZC302 installation specifications, with independent shielding and professional anti-interference treatment.

6 Power & Grounding Wiring

The device adopts 24V DC working power supply for power wiring, equipped with a dedicated 1A fuse for overcurrent protection. All grounding terminals shall be connected to the unified substation grounding grid through standard grounding cables, realizing equipotential grounding, and effectively improving the system’s overall anti-interference capability and operational safety.

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