Description
The feeder protection relay REX 521 is designed for protection, control, measuring and supervision in medium voltage networks and for protection of large or medium-size three-phase a.c. motors in circuit breaker controlled motor drives. Typical applications include incoming, outgoing feeders and motor feeders as well as substation protection. Further, the relay can, e.g., be applied as back-up protection of power transformers and back up for high-voltage line-protection relays. The protection relay is provided with energizing inputs for conventional current and voltage transformers. Also a hardware version with inputs for current and voltage sensors is available. The REX 521 Feeder Protection Relay has been further enriched with additional features to provide your electrical network with even more efficient protection, extended measuring functions, supervision, control functions and connectivity. The REX 521 is mainly used in single busbar solutions, using one circuit breaker for various protections. With pre-made, standard configurations the unit can be used in different types of networks and the typical applications include incoming and outgoing feeders in radial isolated neutral, resonant earthed, solidly earthed and resistively earthed systems.
Scope
• Protection, control, measuring and supervision in medium voltage networks and for protection of large or medium-size three-phase a.c. motors
Product benefits
• Multi-functional protection
Product features
• Energizing inputs for conventional current and voltage transformers
• Version with inputs for current and voltage sensors is also available
• Pre-made, standard configurations
The REX 521 Feeder Protection Relay providesyour medium-voltage network with efficientprotection, measuring, supervision and basiccontrol functions. The typical REX 521 applications include incoming and outgoing feedersin isolated neutral, resonant earthed, solidlyearthed and resistively earthed systems.
This state-of-the-art protection relay complements the ABB range of solutions from basicprotection relays to intelligent feeder terminalsfor distribution system applications. REX 521provides your network with standard protectionfunctions such as three-phase overcurrent,non-directional and directional earth-fault,thermal overload protection and phase discontinuity protection. Additionally, the relaysupervises power quality in your network bymeasuring harmonics.
Improved user-friendliness due to multilingualuser-interface and clear text messages foralarms and time-stamped events.The REX 521 offers advanced condition monitoring for your auxiliary equipment as wellas for the relay itself. The supervision andcondition monitoring functions add to theoperational safety of the equipment and associated circuitry and devices such as measuringand tripping circuits and the circuit breaker.
In addition to its protection functions,the REX 521 relay offers: - Versatile measurements for monitoring your network - Integrated disturbance functionswith high sampling frequencyenabling accurate disturbancedetection - Circuit breaker control - Auto-reclosing - Condition monitoring - Total harmonic distortion (THD)for power quality measurements The REX 521 relay is capable ofcontrolling one circuit breaker ordisconnector via a substation controlsystem or binary inputs.
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