ABB RET543AM240AAAA
ABB RET543AM240AAAA
ABB RET543AM240AAAA
ABB RET543AM240AAAA

ABB RET543AM240AAAA | Relion 540 Series Distance Protection Relay

  • Brand: ABB
  • Model: RET543AM240AAAA
  • Product Type: Numerical Protection Relay
  • Series: Relion 540 Series (ABB Power Protection Portfolio)
  • Core Function: Provides distance protection, overcurrent/earth fault protection, and auxiliary functions for medium-voltage transmission/distribution feeders; enables fault detection, isolation, and system restoration.
  • Key Specs: 110-240V AC/DC supply, 1A/5A nominal current input, IEC 61850/MODBUS communication, -20°C to +70°C operating temperature.
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Part number: ABB RET543AM240AAAA
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Description

RET543AM240AAAA: Product Overview
This device is a numerical protection relay within ABB’s Relion 540 Series, designed for medium-voltage power system protection in transmission and distribution networks. In an electrical grid architecture, it functions as a critical component of the protection, instrumentation, and control (PIC) system, positioned at substations or feeder endpoints to monitor electrical parameters (voltage, current, power) and execute protective actions. Its role is to detect abnormal conditions (e.g., short circuits, earth faults, overloads) and initiate rapid isolation of faulty sections to prevent equipment damage and minimize outage duration.
The core functionality involves sampling three-phase currents and voltages (via CTs/VTs), applying digital signal processing algorithms to calculate impedance (for distance protection), and comparing measured values against configurable thresholds (for overcurrent/earth fault protection). It supports zone-based distance protection (e.g., 3-zone mho characteristic) for selective fault clearing, with adjustable time delays to coordinate with upstream/downstream devices. The relay also provides auxiliary functions: synchrocheck, under/overvoltage, under/overfrequency, and event recording (fault waveforms, sequence of events).
It belongs to the Relion 540 Series, a product family optimized for modularity, interoperability, and compliance with global power standards. The platform’s benefits include a unified engineering tool (ABB PCM600) for configuration and diagnostics, adherence to IEC 60255 (protection relays) and IEC 61850 (communication), and backward compatibility with legacy ABB relays—enabling phased modernization of existing substations.

ABB RET543AM240AAAA

ABB RET543AM240AAAA

RET543AM240AAAA: Technical Specifications
  • Model Number: RET543AM240AAAA
  • Manufacturer: ABB
  • Product Type: Numerical Protection Relay
  • Protection Functions: Distance (21), Phase Overcurrent (51), Earth Fault (51N/67N), Overvoltage (59), Undervoltage (27), Synchrocheck (25), Under/Overfrequency (81O/U)
  • Nominal Current Input: 1A or 5A (configurable, via CT secondary)
  • Nominal Voltage Input: 110-240V AC/DC (dual-rated supply)
  • Communication Protocols: IEC 61850 (Edition 2), MODBUS RTU/TCP, DNP3
  • Distance Protection Zones: 3 zones (mho/quadrilateral characteristic, adjustable reach/time)
  • Event Recording: 1024 events, 8 fault records (waveforms up to 64 samples/cycle)
  • Operating Temperature: -20°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Enclosure Rating: IP52 (front panel), IP20 (rear)
  • Dimensions: 188mm x 146mm x 77mm (WxHxD, panel-mount)
  • Weight: 1.2kg
Core Features & Customer Value​
The relay’s design prioritizes protection accuracy, system coordination, and operational efficiency. Distance protection with 3-zone mho characteristics enables selective fault clearing in radial/meshed networks—for example, isolating a fault in Zone 1 (local feeder) without tripping upstream breakers, minimizing outage scope. Adjustable reach (5-200% of line impedance) and time delays (0-10s) allow customization for varying line lengths and system impedances, critical for utilities with heterogeneous grid topologies.
IEC 61850 communication support streamlines integration with modern substation automation systems (SAS), enabling peer-to-peer GOOSE messaging for fast interlocking (e.g., breaker failure protection). This reduces reliance on hardwired interconnections, cutting installation costs and improving reliability. MODBUS RTU/TCP and DNP3 protocols ensure compatibility with legacy SCADA systems, easing phased upgrades.
Event recording (8 fault records with 64 samples/cycle) provides post-fault analysis data, helping engineers identify root causes (e.g., lightning-induced surges, insulation breakdown). For maintenance teams, this reduces diagnostic time from hours to minutes. The PCM600 engineering tool simplifies configuration: engineers define protection settings, logic equations, and communication parameters via a graphical interface, with built-in validation checks to prevent misconfigurations.

ABB RET543AM240AAAA

ABB RET543AM240AAAA

Typical Applications​
In a 138kV transmission line feeding a suburban distribution network, the relay monitors phase currents/voltages to detect short circuits. Its Zone 1 distance protection clears faults within 0.1s, while Zone 3 provides backup for adjacent line faults. IEC 61850 GOOSE messages coordinate with upstream 345kV substation relays, ensuring system-wide selectivity.
At an industrial plant’s 33kV incoming feeder, the relay protects against motor-start overloads (phase overcurrent) and stator earth faults (51N). Underfrequency protection (81U) initiates load shedding during generator trips, maintaining plant stability. Event recordings help analyze intermittent faults caused by harmonic distortion from variable frequency drives.
In a rural distribution network with long radial feeders, the relay’s quadrilateral distance characteristic adapts to high-resistance earth faults (common in overhead lines). Configurable time-delay coordination with downstream reclosers prevents unnecessary outages during transient faults (e.g., tree contact).

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