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Combined earth fault and short circuit indicator EOR-1D


The combined earth-fault and short-circuit indicator type EOR-1D can be used in compensated, isolated and solidly earthed medium voltage networks. A core balanced current transformer (CBCT) is not needed. The sensors must be mounted on screened cables. During the operational state, the indicator must be connected to an external power supply – it is allowed to fail in case of an error.

Short Circuit

For compensated, isolated and solidly earthed networks the EOR-1D can used as undirected short circuit indicator (only current measurement necessary) or as directed short circuit indicator (current and voltage measurement necessary).

  • phase selective short circuit indication
  • trigger angle setting (optional)
qu2 Transient Algorithm

For compensated and isolated neutral systems the reliable qu2 transient algorithm, know from the „big brother“ EOR-3D, can be used.

  • One time evaluation of the initial transient event at the beginning of an earth fault
  • Detection of low and high impedance faults
  • Elimination of circulating currents in ring feeder setups
Pulse location w/o overcompensation

For compensated networks that have installed appropriate pulse sources, which generate a pulse signal during stationary state of an earth fault. The pulse location method is based on evaluation of the three phase currents. Thereby the pulse location algorithm of the EOR-1D has significant advantages against classical pulse location devices:

  • no separate core balanced current transformer (CBCT) is necessary
  • independent from the detuning of the Petersen coil
  • same results with symmetrical and unsymmetrical pulse signals
  • Pulse location with distributed Petersen coils possible
Remote connection

The EOR-1D can be not only connected via two freely programmable relays and two fixed binary inputs (test, reset), but also through Modbus RTU protocol via RS485. In the standard register configuration all information and indications can be polled, as well as most of the parameters be set. Even during power supply fail all data points are still available (backup-battery).

Fault recorder with up to 32 GB

Fault records with a length of 3.5 seconds are recorded on the internal SD-card in case of a recognized short circuit or earth fault. SD-cards with a maximum of 32 GB are supported.

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