ABB REX521BBHGLB01C Feeder Protection Relay
ABB REX521BBHGLB01C Feeder Protection Relay
DESCRIPTION
The REX 521 Feeder Protection Relay provides your medium-voltage network with efficient protection, measuring, supervision and basic control functions. The typical REX 521 appli cations include incoming and outgoing feeders in isolated neutral, resonant earthed, solidly earthed and resistively earthed systems.This state-of-the-art protection relay comple ments the ABB range of solutions from basic protection relays to intelligent feeder terminals for distribution system applications. REX 521 provides your network with standard protection functions such as three-phase overcurrent, non-directional and directional earth-fault, thermal overload protection and phase discon tinuity protection. Additionally, the relay supervises power quality in your network by measuring harmonics.
Main Functions
Overcurrent protection: provide three-stage three-phase non-directional overcurrent protection to ensure that the circuit can be cut off in time when the current is abnormal, preventing equipment damage.
Ground fault protection: with three-stage non-directional ground fault protection function, effective response to ground faults, to ensure the safe operation of the power system.
Other protection functions: including three-phase discontinuity protection, three-phase cable thermal protection, three-phase transformer surge and motor start-up current detection, etc., comprehensively protect the power system from various faults.
Monitoring and Measuring Functions
Energised current input loop monitoring: real-time monitoring of the status of the current input loop to ensure the normal operation of the circuit.
Current waveform distortion measurement: able to measure the degree of distortion of the current waveform, providing important reference for the stability and safety of the power system.
Three-phase current and neutral line current measurement: accurately measure three-phase current and neutral line current, providing a basis for power system analysis and optimisation.
Control and indication function
Circuit breaker control: Provide circuit breaker control function with indication, which can realise remote or local control of circuit breakers.
Locking function: Provides locking function to prevent misoperation leading to power system failure.
Object indication and logical control position selector: facilitates users to quickly locate and operate each object in the power system.
Communication and interface
IEC 60870-5-103/LON/SPA Communication: Supports a variety of communication protocols to facilitate data exchange and remote monitoring with other devices in the power system.
Multi-language user interface: Provide multi-language user interface, convenient for users in different countries and regions.
Mechanical dimensions and installation
The ABB REX521BBHGLB01C Feeder Protection Relay has moderate mechanical dimensions, with a width of 148.8 mm (1/3 of a 19’ rack), a rack height of 265.9 mm (6U), and a case depth of 235 mm. This allows it to be easily installed in a variety of power systems to meet different installation requirements.
Product Features
High performance: adopting high-performance microprocessor and advanced control algorithm, it can realise fast and accurate control and monitoring, and improve production efficiency and product quality.
Modular design: It is convenient for users to configure and expand, which improves the flexibility and maintainability of the system.
Easy Integration: Provide standard communication interface and protocol, which is convenient for users to integrate with other equipments and achieve seamless connection.
High reliability: Made of high-quality materials and advanced technology, it has high reliability and stability, and can operate stably under harsh working environment.
Easy to use: Provides simple interface and easy-to-operate software, which is convenient for users to install and use. At the same time, the module also has a self-diagnostic function, which can help users quickly locate faults and maintenance.
Good scalability: can be seamlessly integrated with other ABB modules and equipment, which is convenient for users to build a large-scale automation control system.
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