Compact overcurrent relays RXHL 4xx and line protection RAHL 4xx
The four overcurrent and earth-fault relays RAHL/RXHL 401, 411, 421 and 422 are intended for power system applications and as backup to e.g. the 500 series terminals at all system voltage levels including EHV. All time-curves are provided according to IEC 60225-3, the thermal replica overload function and the RI and a special logarithmic curve for earth-faults in EHV systems are also available. Intermittent phase- and earth-faults can be detected. The relays are also intended for retrofit and replacement of earlier electromechanical and static relay designs.
RXHL/RAHL 401
Three stages for phase overcurrent I>, I>>, I>>> alarm and trip functions
Three stages for earth-fault alarm and trip functions
Supersedes RXIDK 4 and RAIDK 400
RXHL/RAHL 411
Three stages of three-phase time-delayed or instantaneous overcurrent protection, I>, I>>, I>>> alarm and trip functions
Three-phase thermal overload protection, Q> alarm and trip functions
Three stages of time-delayed or instantaneous earth-fault protection, IN>, IN>>, IN>>> alarm and trip functions
Breaker failure protection, three phases and neutral current detection, selectable timing logic and retrip for single & three-pole trip applications
Pole disagreement function based on separate phase current level measurement
Autoreclosing, up to 4 attempts (option)
Extra I/O board with 4 optocoupled inputs and 4 relay outputs (option)
RXHL/RAHL 421 for high impedance earthed systems
Three stages of two-phase time-delayed or instantaneous overcurrent protection, I>, I>>, I>>> alarm and trip functions
Three-phase thermal overload protection, Q> alarm and trip functions
Three stages of time-delayed or instantaneous directional earth-fault protection, IN>, IN>>, IN>>> alarm and trip functions. - Neutral point voltage stage, enabling criteria for directional earth-fault stage. Definite time delay, serves also as back-up protection. - Uni- or bi-directional operating characteristic and manual or remote change of characteristic angle, 0° or -90°. Definite time delay.
Neutral point time-delayed overvoltage function (one step)
Logic for detection and clearance of intermittent faults
Breaker failure protection, three phases and neutral current detection, selectable timing logic
Pole disagreement function based on separate phase current level measurement
Autoreclosing, up to 4 attempts (option)
Extra I/O board with 4 optocoupled inputs and 4 relay outputs (option)
RXHL/RAHL 422 for solidly earthed or low impedance earthed systems
Three stages of two-phase time-delayed or instantaneous overcurrent protection, I>, I>>, I>>> alarm and trip functions
Three-phase thermal overload protection, Q> alarm and trip functions
Three stages of time-delayed or instantaneous directional or non-directional earth-fault protection for effectively earthed networks, IN>, IN>>, IN>>> alarm and trip functions. - Polarising voltage down to 0.5%. - Settable characteristic angle from 0° to 90°.
Breaker failure protection, three phases and neutral current detection, selectable timing logic
Pole disagreement function based on separate phase current level measurement
Autoreclosing, up to 4 attempts (option)
Extra I/O board with 4 optocoupled inputs and 4 relay outputs (option)
COMMON FEATURES
Logic for detection and clearance of intermittent faults
Two binary inputs for blocking or enabling functions and five configurable binary output relays
Additional binary I/O module, 4 inputs and 4 outputs, for 411/421/422 (option)
Self-supervision with output alarm selectable via relay contact
Two setting groups selectable by binary input or HMI setting
Very user friendly HMI-dialog
Service value reading (primary or secondary values) and disturbance information through the fully graphic HMI
Three LED's for In service, start and trip indication
Test of binary outputs and inputs can be performed through the HMI
Several mounting alternatives are available; 19" equipment frames, panel mounting cases and DIN-rail adapters