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ABB REF545KB133AAAA|Protection Relay|
Based on the characteristics of products in the same series, this terminal is expected to provide a full set of protection capabilities, including:
Phase-to-phase overcurrent protection
Ground protection and zero-sequence overvoltage protection
Undervoltage protection
Thermal overload protection
Circuit breaker failure protection (CBFP)
Automatic reclosing (AR)
The device can be applied to various medium-voltage network grounding modes, such as ungrounded and resonant-grounded systems. It also supports specialized protection requirements for capacitor banks and medium-voltage three-phase asynchronous motors.
Flexible Control and Measurement Capabilities
The control layer supports both local and remote operation of circuit breakers and isolating switches, as well as synchronism check functions. It provides complete equipment status indication and interlocking status display.
The measurement module can precisely acquire key electrical quantities, including:
Phase current, line voltage, zero-sequence current
Frequency, power factor
Active and reactive power
Full energy metering
The terminal is compatible with modern electronic current/voltage sensors as well as traditional CT and PT inputs.
Convenient Communication and Status Monitoring
The terminal is expected to integrate multiple communication interfaces and support major industry protocols such as:
IEC 60870-5-103
Modbus
DNP3.0
It can communicate locally with a PC or integrate into a substation automation/SCADA system for remote data exchange.
Additional status monitoring functions include:
Circuit breaker position and health indication
Trip-circuit supervision
Internal self-diagnostics
Certain versions may also support optional RTD modules, enabling additional analog measurements such as temperature.
ABB REF545KB133AAAA|Protection Relay|
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By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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