ABB REF542PLUS 1VCR007346 Feeder Terminal

Configured for feeder, transformer, and motor protection in medium-voltage switchgear, the ABB REF542plus (1VCR007346) (REF542plus feeder terminal) provides integrated measurement, monitoring, protection, control, self-diagnostics, and substation communication.

Hardware Specifications

Protection, Measurement, and Control Functions

The REF542plus combines bay control and protection functions in one feeder terminal. Protection functions include phase overcurrent, directional overcurrent, earth/ground fault, voltage protection, thermal overload, phase imbalance, and short-circuit detection.

Measurement processing covers current, voltage, active and reactive power, energy, frequency, and power factor. The event log stores up to 30 recent events with associated timestamps and RMS current values. The disturbance recorder supports up to 7 analog channels and 32 binary signals.

Communication interfaces include Modbus RTU, IEC 60870-5-103, IEC 61850 GOOSE messaging, and RS485 for integration with substation automation and supervisory systems.

Industrial Control and Firmware Compatibility

As an ABB digital bay control and protection unit, the REF542plus combines measurement, monitoring, control, protection, communication, and self-diagnostic functions within a single hardware platform. Its integrated communication functions allow connection to ABB or third-party substation automation systems.

The supplied documentation identifies the REF542plus as a not-active product since 2020. Firmware compatibility, configuration software requirements, and replacement engineering should therefore be verified against the installed terminal revision before commissioning or retrofit work.

Frequently Asked Questions (FAQ)

Q: How long does the internal RTC retain time during a DC power failure?
A: The internal RTC uses a supercapacitor backup and maintains timekeeping for >= 2 hours during DC power failure.

Q: What disturbance recording capacity is specified for the REF542plus?
A: The disturbance recorder supports up to 7 analog channels and 32 binary signals.

Q: Which communication protocols are specified for the terminal?
A: The supplied data specifies Modbus RTU, IEC 60870-5-103, IEC 61850 GOOSE messaging, and RS485.

Field Installation Guidelines

• Verify the REF542plus part number, hardware revision, terminal configuration, and protection settings against the approved switchgear documentation before installation.
• Confirm the rated system voltage and current range of the installed application before connecting measurement circuits.
• Route current and voltage measurement wiring separately from high-current power conductors where practical to reduce electromagnetic interference.
• Use shielded communication cabling where required by the site communication design, and terminate shields according to the plant grounding specification.
• Verify RS485 polarity, termination, cable routing, and grounding before energizing the communication interface.
• Confirm CT and VT circuit wiring and polarity before enabling protection functions.
• Check the enclosure and mounting arrangement against the specified IP20 protection condition and the actual switchgear installation.
• Allow the terminal to reach the specified operating temperature range before commissioning.
• Because the REF542plus is identified as inactive since 2020, verify available engineering tools, firmware compatibility, configuration files, and system interfaces before replacing or reconfiguring an installed unit.