ABB REJ601 BD446NN1XG Product Introduction

ABB REJ601 BD446NN1XG is a digital feed protection relay designed specifically for medium voltage distribution networks,integrating protection,monitoring,and control functions.It is suitable for public substations,industrial power systems,and complex distribution scenarios.The following are its core functions and technical features.

Core functions

Multi functional protection

Overcurrent protection:three-level overcurrent protection(including timed DT and inverse time IDMT characteristics),supporting IEC and ANSI standards.

Ground fault protection:Two level ground fault protection,compatible with internal calculations or external zero sequence current transformer(CBCT)measurements.

Thermal overload protection:Real time monitoring of equipment load status to prevent overheating damage.

Phase discontinuity protection:detects phase failure,single-phase or reverse phase faults to ensure power supply continuity.

Circuit breaker fault protection:prevents circuit breakers from refusing or misoperation,and improves system reliability.

Special Features

Surge detection:Suppress the surge current during transformer charging that may cause false tripping.

Automatic recloser function:suitable for multiple fault recovery of overhead line feeders.

Control and Monitoring

Supports local human-machine interface(HMI)and remote communication(Modbus/IEC 60870-5-103).

Provide 100 event records with timestamps,five simulated fault records,and non resettable trip counters.

Technical parameters

hardware design

Installation method:Press in design,small depth,suitable for compact switchgear.

Sensor input:Supports 1A/5A standard CT input and Rogowski coil interface.

Power supply:Universal 24-265V AC/DC power supply.

communication protocol

Optional Modbus RTU or IEC 60870-5-103 protocol,supporting fiber optic communication.

Environmental adaptability

Rated frequency:50/60Hz optional.

Self checking function:Dual self checking of hardware and software to ensure stable operation.

Application scenarios

Distribution network protection

Suitable for cables,overhead lines,and transformer feeders in grounded,resistance grounded,or isolated networks.

As the main protection device of distribution transformers,it provides surge current stabilization function.

Industrial system integration

Integrated into medium voltage switchgear,supporting quick installation and debugging,compatible with traditional measurement sensors.

Suitable for power system protection and monitoring in industries such as power plants,chemicals,and metallurgy.

Advantages and Characteristics

high reliability

Adopting press fit installation to reduce the risk of looseness;Built in trip circuit monitoring and circuit breaker control functions.

flexible configuration

Support application configuration B/C/D,corresponding to different protection levels(such as adding negative sequence protection and automatic recloser function to configuration D).

user friendliness

Dual setting group switching,multilingual interface,and pre configuration function simplify the parameter setting process.