XRI1

Productomschrijving

The XRI1-ER of the PROFESSIONAL LINE is an all-purpose protection against earth faults, used for electrical machines, lines and isolated or compensated systems; it is mainly used in radial networks.

Relay variant XRI1-ER with directional current sensing is a selective earth-fault protection and is normally used in ring systems, networks with parallel feeders and in complex meshed systems.

Very often the XRI1-ER can be found as backup protection at the central earthing point of the system. It detects all earth faults occurring in the system. In this case the trip delay selected must exceed the longest time delay setting of any other earthing protection used in the system.

Features:
• Digital filtering of the measured values by using discrete Fourier analysis to suppress the high frequency harmonics and DC components induced by faults or system operations.
• High set overcurrent unit with instantaneous or definite time function
• Sensitive earth fault current measuring with directional earth current measuring (XR-type).
• Numerical display of setting values, actual measured values and their active, reactive components, memorized fault data, etc.
• Withdrawable modules with automatic short circuit of C.T. inputs when modules are withdrawn.
• Blocking function of both earth current steps
• Switch failure protection.
• Free assignment of output relays.
• Serial data exchange via RS485 interface possible; alternatively with SEG Electronics RS485 Pro-Open Data Protocol and Modbus Protocol.
• Suppression of indication after an activation (LED flash).