Provides basic protection for busbars and feeders in utility substations and industrial distribution systems

Products not used since 2012

The feeder protection relay REX 521 is designed for protection, control, measurement and monitoring in medium-voltage grids, as well as for the protection of medium and large three-phase AC motors in circuit breaker-controlled motor drives.

and for the protection of medium and large three-phase AC motors in circuit breaker controlled motor drives.

Typical applications include inlet and outlet feeders and motor feeders as well as substation protection.

In addition, the relays can be used as backup protection for power transformers and as backup protection for high-voltage line protection relays.

The protective relay is equipped with energizing inputs for conventional current and voltage transformers. Hardware versions with current and voltage sensor inputs are also available.

The REX 521 feeder protection relay is further enriched with additional functions to provide your grid with more efficient protection, extended measurement functions, monitoring, control functions and connectivity.

The REX 521 is primarily used in single-bus solutions for various protections using a single circuit breaker.

With pre-fabricated standard configurations, the unit can be used in different types of networks. Typical applications include input and output feeders in radially isolated neutral, resonant grounded, solid grounded and resistance grounded systems.

Scope

Protection, control, measurement and monitoring in medium voltage networks and for the protection of medium and large three-phase AC motors

Product advantages

Multifunctional protection

Product features

energized inputs for conventional current and voltage transformers

Versions with current and voltage sensor inputs also available

Prefabricated, standard configuration