The ABB REF545KB133AAAA is a high-performance medium-voltage feeder protection and measurement terminal in the REF545 series. The following is a detailed description:

Features

Comprehensive Protection: Provides comprehensive protection functions including phase-to-phase overcurrent and ground fault protection, zero-sequence overvoltage protection, overvoltage and undervoltage protection, thermal overload protection, circuit breaker failure protection, and automatic reclosing, providing comprehensive protection for medium-voltage grid equipment.

Flexible Control Mode: Supports local and remote control of switch objects, and integrates synchrocheck, switch object status indication, and station-level interlocking functions to meet diverse control requirements.

Precise Measurement: Accurately measures three-phase current, zero-sequence current, three-phase voltage, zero-sequence voltage, frequency, active and reactive power, power factor, and more. It also measures current and voltage harmonics, providing data support for power quality monitoring. Powerful Communication Functionality: Supports multiple communication protocols, including SPA bus, LON bus, IEC 60870-5-103, IEC 61850 via the SPA-ZC 400, Profibus DPV1 via the SPA-ZC 302, DNP 3.0, and Modbus, facilitating integration with higher-level SCADA systems, DCS systems, or substation automation systems.

Condition Monitoring: Includes circuit breaker status display, trip circuit monitoring, and internal self-tests at feeder terminals. It also monitors current and voltage input circuits, calculates accumulated electrical wear on circuit breaker contacts, and enables maintenance scheduling.

Programmable Logic: Provides comprehensive PLC logic programming, integrating the automation and sequential logic control functions required for a comprehensive substation automation system into a single device. Programmable via graphical function blocks within the relay configuration tool software.

Technical Specifications: Typically features three serial communication ports: one on the front and two on the back. The digital inputs utilize voltage inputs and are optically isolated. The logic value can be inverted, and the filter time is adjustable. The device features eight LED indicators with configurable parameters.

Applications: Widely used for protection and control of medium-voltage networks in power systems. It is also suitable for internal factory power monitoring and protection in industrial automation, as well as for grid connection points for renewable energy sources such as wind farms and solar power stations. It can also be used for protection and control of medium-sized three-phase asynchronous motors and reactive power compensation for shunt capacitor banks.

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