Description
ABB REF542PLUS 1VCR007346
1. Basic Information
ABB REF542PLUS (Order No.: 1VCR007346) is a multifunctional digital feeder protection and control IED. Designed for 1–36kV medium-voltage distribution systems, it integrates protection, measurement, control, communication and fault recording functions, serving as a core component for substation automation and smart power distribution networks.
Core Positioning: All-in-one terminal for protection, control and monitoring of medium-voltage switchgears, feeders, transformers and motors.Origin & Series: Original ABB product, REF542PLUS series, Model 1VCR007346.Key Advantages: Equipped with over 30 protection functions, dual Ethernet ports and RS485 interface, high-precision measurement and fault recording, which greatly improve power grid safety and operation & maintenance efficiency.
2. Technical Specifications
2.1 Electrical & Measurement Parameters
System Voltage: 1–36kV (for medium-voltage power distribution)Rated Current Input: 1A or 5A (configurable via software)Frequency: 50/60HzAuxiliary Power Supply: 100–240V AC/DC (wide adaptive range)Measurement Accuracy: Current/Voltage ±0.5%, Power ±1.0%
2.2 Core Protection Functions
Current Protection: Instantaneous overcurrent (50), definite time overcurrent (51), inverse definite minimum time overcurrent (51IDMT), directional overcurrent (67)Earth & Zero-sequence Protection: Definite time earth fault (51N), inverse time earth fault (51N IDMT), directional earth fault (67N)Voltage Protection: Overvoltage (59), undervoltage (27), zero-sequence overvoltage (59N)Other Protections: Distance protection (21), differential protection (87), thermal overload protection (49), circuit breaker failure protection, under/over frequency protection, power directional protection
2.3 Communication Interfaces
Ethernet: 2 × RJ45 ports (10/100Mbps), supporting IEC 61850, Modbus TCP and DNP3 protocolsSerial Port: 1 × RS485 port (Modbus RTU)Optional: Optical fiber interface for enhanced anti-interference performance and long-distance data transmission
2.4 Recording & Diagnosis
Event Recording: More than 1000 records with millisecond time stamp; data retained after power lossFault Recording: Max. 8 analog channels and 32 digital channels, sampling rate 1.2kHz, maximum recording duration 5 seconds (COMTRADE format)Self-diagnosis: Automatic diagnosis upon power-on and during operation, with alarm and interlock triggered in case of abnormalities
2.5 Environmental & Physical Parameters
Operating Temperature: -25℃ ~ +70℃Protection Grade: IP54 (front panel)Dimensions (W × H × D): Approx. 144 × 144 × 155mmWeight: Approx. 2.5kg
3. Working Principle
Data Acquisition: Current transformers (CT) and voltage transformers (VT) collect three-phase current and voltage signals, which are converted into digital signals via high-precision AD modules.
Protection Calculation: The device runs overcurrent, earth fault, differential and other protection algorithms in real time. It compares measured values with preset settings and trips the circuit breaker rapidly (typically less than 20ms) once a fault occurs.
Control Logic: It receives local and remote commands to realize circuit breaker switching, disconnector control and automatic reclosing.
Communication Interaction: It uploads measured data, operating status, event logs and fault records via IEC 61850 and Modbus, and receives protection settings and control commands.
Fault Analysis: Fault recording is activated automatically when a fault occurs. The system stores event sequences and supports playback for post-fault troubleshooting and cause analysis.
4. Application Scenarios
Medium-voltage Substations: Protection and control for feeders, busbars and transformers of 35kV and below systems.
Industrial Power Distribution: Medium-voltage systems in metallurgy, chemical, petroleum and papermaking plants.
Power Industry: Auxiliary power systems of power plants, booster stations of wind farms and photovoltaic power stations.
Buildings & Data Centers: Medium-voltage power distribution protection for large commercial buildings and data centers.
Legacy System Renovation: Replacement of traditional electromagnetic relays to upgrade system intelligence and communication capability.
