For rapid fault location in the event of earth faults and short circuits, to minimise downtime. Supports network operations, technical teams and service staff with clear instructions for safe switching operations and rapid restoration of power supply.
Typical applications:
- Fault location following a trip when the affected section of the line is unclear
- Pinpointing recurring earth faults in individual feeder circuits or substations
- Assisting with fault clearance when rapid switching operations need to be prepared
- Documenting incidents and procedures for internal clarification and record-keeping
This device is suitable if:
- The fault location needs to be pinpointed quickly to minimise downtime
- On-site teams require clear guidance on how to isolate the fault safely
- The fault sequence needs to be recorded in a traceable manner and analysed
- Repeated, event-driven fault location is required rather than continuous monitoring
Fit for the Intelligent Substations of Tomorrow
Products
Application Areas
EORSys - Short-Circuit and Earth Fault Detection
A. Eberle GmbH & Co. KG
Measure. Regulate. Across All Grids.
A. Eberle GmbH & Co. KG, founded in 1980 and headquartered in Nuremberg, Germany, operates in the field of measurement and regulation technology for the energy sector as well as for medium-sized and large industrial companies. Our products and services ensure and enhance the availability of energy supply across all voltage levels and support the integration of renewable energy sources into power grids.
Our Short-Circuit and Earth Fault Indicators as an Essential Building-Block
In Substations & Secondary Substations
Our short-circuit and earth fault indicators make it possible to combine the advantages of different location methods. This makes it possible for the first time to prioritise and weight the methods in order to perfectly match them to the respective application.
This combination makes our devices particularly well-suited for use in both digital and conventional secondary substations. Naturally, these advantages also apply directly at the primary substation level.
Quick Comparison: EOR-1DS vs. EOR-3DS
Find the Right short-circuit and earth fault indicator for Your Application.
EOR-1DS
The economical indicator for
the secondary substation
EOR-3DS
The fault indicator for
the digital secondary substation
qu2 transient algorithm
Transient earth fault methodDirectional short-circuit and earth fault detection
Pulse location
Wattmetric method cos(φ)
Reactive power direction sin(φ)
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Simple operation and parameterisation without software
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Extensive cyber security features✔️
Flash memory up to 32 GBCapacitive in parallel with VDS systems, low power sensors (two-wire technology) and classic transducers
Rogowski folding transducers, low power sensors (two-wire technology) and classic transducers
Modbus RTU
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qu2 transient algorithm
Transient earth fault methodDirectional short-circuit and earth fault detection
Pulse location
Wattmetric method cos(φ)
Reactive power direction sin(φ)
qui-Method
Restriking faultsHarmonics method
Open setup as required with »AEToolbox« software
Certificate handling, user/role concept and encrypted connections
Extensive cyber security features✔️
Flash memory up to 32 GBCapacitive in parallel with VDS systems, Low power sensors (two-wire technology or RJ45) and classic transducers
Low power sensors (two-wire technology or RJ45) and classic transducers
Modbus RTU/TCP (Incl. "Modbus Master")
IEC 60870-5-101 / 104, IEC 60870-5-103 Including Fault Records, IEC 61850 GOOSE, DNP 3.0
MQTT Management&Operations
MQTT IoT
Patch- and Devicemanagement via MQTT
Mass remote parameterisation and firmware updatesvia MQTT Management&Operations-function
FAQ
What is the difference between short-circuit and earth fault indicators?
Short-circuit indicators detect faults involving high fault currents between conductors or to earth. Earth fault indicators are designed to detect single-phase faults to earth and support more targeted fault location in the grid.
Why are short-circuit and earth fault indicators important in medium-voltage grids?
They help utilities and grid operators detect faults faster, reduce search times and improve service restoration in substations, secondary substations and distribution networks.
When is EOR-1DS the right choice?
EOR-1DS is a strong choice when a cost-efficient fault indicator is needed for standard applications in secondary substations and when communication requirements are more limited.
When is EOR-3DS the better solution?
EOR-3DS is the better fit when the application requires advanced communication, flexible parameterisation and integration into digital secondary substations.
Which fault location methods can be relevant?
Depending on the grid and application, relevant methods can include transient earth fault methods, pulse location, directional methods, wattmetric methods or reactive power direction methods. The right combination depends on network conditions and the measurement concept.
Which applications are typical for these solutions?
Typical applications include digital and conventional secondary substations, transformer stations at grid nodes, substations, transmission and distribution grids, as well as industrial plants.
Why does communication matter for fault indicators?
In digital substations, communication interfaces and protocol support are essential for integration into SCADA and grid digitalisation strategies. Advanced devices can support broader interoperability and remote management functions.
Why does grid topology influence device selection?
Because the suitable fault location method, sensor concept and communication setup depend on whether the solution is used in a conventional or digital substation environment.
News From the Product Group
EORSys - News
General Knowledge
Digital Substation
17. June 2026
Table of Contents 1. Classification: Why the digital substation is becoming more important 2. From grid node to measurement and […][...]
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Blogpost
International Partner Week 2026 - Exchange, knowledge transfer and collaboration in Nuremberg
1. June 2026
We were delighted to welcome our international partners to Partner Week 2026. The chance to chat in person, seeing familiar faces and making new acquaintances made the week a special one for us.[...]
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Blogpost
A. Eberle and Bregal Unternehmerkapital enter into a growth partnership
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A. Eberle and Bregal enter into a growth partnership. The partnership with BU is intended to accelerate A. Eberle’s international expansion, innovation and technological advancement.[...]
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Webinar
»Cyber Security« Webinar: A Challenge for European Energy Companies
3. December 2025
Webinar recording from 2025-11-26: »Cyber Security« - A Challenge for European Energy Companies[...]
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Blogpost
A. Eberle at the Schwabach City Run 2025
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A. Eberle was represented by 37 participants at the 2025 Schwabach City Run, setting a new internal record for participation. Particularly noteworthy is Benjamin Rentsch's first place in the M 35 40 age[...]
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General Knowledge
Power in Multiphase Systems
7. August 2025
This technical report highlights the special features of power transmission in three-phase systems and offers valuable insights into the optimisation and analysis of modern power grids.[...]
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Webinar
»EORSys« Webinar: EOR-1DS - the Economical Fault Indicator for the Secondary Substation
22. July 2025
Webinar recording from 2025-07-16: »EORSys - EOR-1DS - the Economical Fault Indicator for the Secondary Substation«. [...]
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Blogpost
Visit From the Rudolf Diesel Technical School at A. Eberle
15. July 2025
We were happy to welcome you, Rudolf-Diesel-Fachschule! Yesterday, we had the pleasure of welcoming two classes of future electrical engineering technicians from the Rudolf-Diesel-Fachschule Nürnberg[...]
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Blogpost
TOP 100 Awards 2025: Innovation for the Energy Future
15. July 2025
💡 As part of the TOP 100 Awards 2025, we were honored to receive a special recognition last week in Mainz – personally presented by TV host and science journalist Ranga Yogeshwar.[...]
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Blogpost
University Excursion: Pentecost Excursion of the Friedrich-Alexander-University Erlangen-Nuremberg (FAU)
14. July 2025
As a company dedicated to innovation, education, and the energy transition, we are pleased to have once again supported the Whitsun excursion of Friedrich-Alexander University Erlangen-Nuremberg (FAU)[...]
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Blogpost
Further Growth at A. Eberle
14. July 2025
Welcome to the team! We welcome our new colleagues at A. Eberle.[...]
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Product innovation
Product Discontinuation: Power Quality Interface (PQI-D) as of 31.12.2026
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The Power Quality Interface (PQI-D) product can only be ordered up to and including 31 December 2026.[...]
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Product innovation
Product Discontinuation: Earth Fault Locating Relay (EOR-D) as of 31.12.2026
27. March 2025
The product earth fault locating relay for multiple outgoing circuits (EOR-D) can only be ordered up to and including December 31st, 2026.[...]
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Webinar
»EORSys« Webinar: Digital Secondary Substations in the Distribution Grid of the Future
16. September 2024
Webinar recording from 2024-05-07: »EORSys - Digital Secondary Substations in the Distribution Grid of the Future«. [...]
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Blogpost
International Partner Week 2024 - a Look Back
29. August 2024
Our International Partner Week 2024 - many old friends and new faces were our guests, it was a pleasure.[...]
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Webinar
»EORSys« Webinar: Future-Proof Integration of Digital Substations in the Distribution Grid
15. July 2024
Webinar recording from 2024-07-11: »EORSys - Future-proof Integration of Digital Substations in the Distribution Grid«. [...]
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Product innovation
Product Discontinuation: Profibus-DP in the Types B01 & B02 as of 15.05.2024
3. June 2024
Profibus-DP in the types B01 & B02 is currently scheduled for product discontinuation.[...]
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General Knowledge
The Future of the Distribution Grid: Focus on Digital Secondary Substations
13. May 2024
In this technical report, Gerald Jacob (Product Manager »EORSys«) uses a specific example to illustrate how distribution system operators can meet the challenges of energy transition in the medium and[...]
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General Knowledge
Earth Fault Explained - Basics and Functions of an Electrical Phenomenon
6. March 2024
Everything you need to know about earth faults - from the basics, causes and examples to the consequences. Find out more in this article about earth fault clearing, compensation, location and the benefits[...]
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All information about smart grids/intelligent power grids, the technology behind them, advantages, disadvantages, challenges and current distribution.[...]
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