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Earth fault and short circuit indicator EOR-3D


In order to take advantage of the different earth-fault detection methods in various fault situations, the freely programmable earthfault-detection and short-circuit-indicator EOR-3D makes it possible to select and combine the following methods:

  • Transient-method using qu2 und qui algorithms
    - for single faults
    - intermittent and restriking faults
    - fault detection in loops with high circulating current
  • Direction of reactive power of the zero-sequence system, resp.sin(ϕ) method
  • Direction of active power of the zero-sequence system, resp. cos(ϕ) method, suitable instrumenttransformers assumed
  • Harmonics method including evaluation of the associated reactive power direction for a freely selectable frequency
  • Pulse-method: traditional as well as using the new high-power current injection (HPCI). Using the EOR-3D, overcompensation is not mandatory
  • Indication of short-circuits to earth in low resistance resp. solidly grounded networks
  • Directional short-circuit indicator with suppression of signals, caused by atmospheric interference
  • Short-circuit recognition with adaptive trigger levels
  • Recognition of cross country earth-faults
  • Recognition of series faults by monitoring the current unbalance
  • Recognition of ferroresonance
Additionally, the following features are available, either as standard or optional:
  • Logbook of events
  • Fault recorder with a sampling rate of ≥ 2 kHz
  • Records with memory depth up to the GB-range, by the use of an internal mass storage based on a micro-SD card
  • Ethernet interface used for parameterization and to transfer the data from the logbook and the fault recorder via PC or intranet.
  • USB 2.0 FS interface for an USB-stick used to transfer the data from the logbook and the fault recorder and for firmware-updates
  • Depending on the configuration, EOR-3D is adapted for the use of traditional instrument transformers or current- and voltage-sensors
  • A local integration of EOR-3Ds can be made via a proprietary LAN, based on CAN
  • The Ethernet-interface with 10/100 MHz allows a LAN connection, so that a quick transfer of data, parameterization and even a simplified GOOSE transmission is possible
  • Several serial interfaces allow signaling of faults via
    - GSM as SMS
    - GPRS / UMTS
    - WLAN
    - modem
    - radio in the 800 MHz range with an operating distance of about 30m, so that an on-site inspection may be not necessary
    - reduced extend of signaling, based on IEC 60870-5-103

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Design & development: PlanetCreativ

  • A. Eberle GmbH & Co. KG
           Frankenstr. 160, D-90461 Nuremberg
  • +49 (0)911 62 81 08 - 0
  • info(at)a-eberle.de