Description

RXHL/RAHL – 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 650 or 670 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