Short-Circuit and Earth Fault Indicators
Solutions for Varying Network Topologies
Fit for the Intelligent Substations of Tomorrow
Products
Application Areas
EORSys – Short-Circuit and Earth Fault Detection
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
News From the Product Group
EORSys – News
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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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
27. March 2025
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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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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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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General Knowledge
Ready for the Smart Grid of the Future?
6. March 2024
All information about smart grids/intelligent power grids, the technology behind them, advantages, disadvantages, challenges and current distribution.[…]
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Special Publication
Cost Efficient Management of Digital Secondary Substations: Earth Fault Indicator EOR-3DS as Digitisation Unit for Secondary Substations
11. August 2023
Digital secondary substations are becoming a key element for distribution system operators in terms of automation, monitoring, and efficient operations of their networks. Read this technical report about[…]
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Blogpost
Kick-off for Mass Rollout of the Digital Local Network Station at »Netze BW«
31. July 2023
Our product manager Gerald Jacob (»EORSys«) with a short Q&A at the official kick-off event of the digital secondary station »FFU 2.0«.[…]
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Product innovation
Product Discontinuation: Current Injection CI, as of 30.06.2023
14. July 2023
The Current Injection CI is currently scheduled for product discontinuation.[…]
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Blogpost
Brand New: Short-Circuit and Earth Fault Indicator EOR-3DS Released on 27.03.2023
27. March 2023
New combined earth fault and short circuit indicator EOR-3DS: AVAILABLE FOR ORDER NOW[…]
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Product innovation
Product Announcement: Short-Circuit and Earth Fault Indicator EOR-3DS Released on 27.03.2023
24. March 2023
New combined earth fault and short circuit indicator EOR-3DS: AVAILABLE NOW[…]
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Blogpost
Product Announcement: Short and Earth Fault Locator EOR-1DS Released 05.08.2022
23. August 2022
We are pleased to inform you that the product »Combined Earth Fault and Short Circuit Indicator EOR-1DS« is officially released as of today. […]
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Product innovation
Product Announcement: Short and Earth Fault Locator EOR-1DS Released 05.08.2022
23. August 2022
Combined earth fault and short circuit indicator EOR-1DS: AVAILABLE NOW![…]
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Product innovation
Product Discontinuation: DIN Rail Housing EOR-3D (Characteristic B02) as of 30.06.2020
12. April 2022
The EOR-3D with characteristic B02 (article numbers: 119.8500 to 119.8584) is currently planned for product discontinuation.[…]
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