The economical short-circuit & earth fault indicator for analog secondary substations
Earth fault and short-circuit location in a single device
The EOR-1DS is a compact device at an economical price that combines short-circuit and earth fault indication. It can be used as non-directionals short-circuit and earth-fault indicator (pulse locating) with the supplied Rogowski SR55 phase current sensors or as a directional short-circuit and earth-fault indicator (pulse locating + qu2 transient algorithm) with current and voltage measurement. With modern low power sensors, highly accurate measurements can be carried out and transmitted via Modbus RTU. The device is particularly important in times of energy transition to create grid transparency and to cope with changing conditions in power grids.
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Product overview A. Eberle
Technical Data Sheets
Reliable and sensitive earth fault direction indication immediately after earth fault occurrence in all network forms
The qu2 transient algorithm as the heart of the short-circuit and earth fault indicator. Known from its big brother EOR-3DS, it can be used in both compensated and isolated networks for:
- One-Time evaluation of the transient process at earth fault occurrence
- Identification of low and high impedance faults
- Elimination of circulating currents in loop operation mode
Better fault localization using the pulse localization method
For compensated networks with a pulsing facility, the pulse based fault locating algorithm with angle evaluation can be used. By considering the phase angle, it is no longer necessary to operate the network in an overcompensated manner, something that above all reduces the burden on decentralised coils.
The grid status always in view – flexible in the choice of your sensors
Do you see the risk of grid bottlenecks due to the strong expansion of decentralized generators or loads such as electromobility? Then monitor your medium-voltage level closely to keep an eye on trends.
The “S” in the name stands for “Sensors”: Our EOR-1DS is optimized for the modern and highly accurate low power sensors of all major manufacturers on the market (ABB, Zelisko, and many more). Of course there is also the possibility of current measurement via Rogowski sensors (SR55) and voltage measurement parallel to a capacitive voltage tester (e.g. Capdis / WEGA). This provides the possibility to determine precise current, voltage and power measurement values evn at the edge of the network.
Also at home in the world of classic voltage converters
EOR-1DS can not only measure the voltage in parallel to a capacitive voltage tester (e.g. Capdis or WEGA) or via low power sensors. The connection of a classic voltage transformer with 100 VAC / 110 VAC secondary voltage is also possible via the U10 adapter.
The same applies to current detection. Besides the possibilities of using the Rogowoski sensors (SR55) or the low power inputs, classic current transformers with 1 A / 5 A secondary current can be connected to EOR-1DS when using the C21/C25 adapters.
Ready for communication and networking
In addition to the connection of the indicator via four freely parameterizable relay contacts and two fixed binary inputs, the short-circuit and ground fault indicator EOR-1DS can also be read out via a Modbus RTU connection via RS485. Here, all information and messages can be queried in the standard register assignment, as well as a large part of the available parameters can be changed.
Intuitive operation via built-in turn-push button
The EOR-1DS can be operated and parameterized completely via the turn-push button. The display is normally in standby mode, i.e. in the switched-off state. It can be activated by pressing the turn-push button on the front of the device. After any pending messages, the statuses and measured values of the phase conductors, the neutral system and the power measured values are displayed on the overview pages. Subsequently, the main menu is accessed and the short-circuit and earth fault indicator can be fully parameterized. Parameterization is also possible via a preconfigured file on the SD card.
Ready to commuicate – even during power cuts
If the supply voltage fails, the display of EOR-1DS remains active. In addition, the built-in long-life capacitor (Super-Cap) guarantees that even message operation can be maintained for at least 4 h (without Modbus communication). If messages are also disposed of via Modbus RTU, communication can be maintained for up to 10 minutes by means of a parameterizable follow-up time.