Woodward
Manual XRI1-ER
6
TD_XRI1-ER_12.03, Rev. C
2. Features and characteristics
Digital filtering of the measured values by using discrete Fourier analysis to suppress the
high frequence 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withdrawn.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 Woodward RS485
Pro-Open Data Protocol and Modbus Protocol.
Suppression of indication after an activation (LED flash).