The REG-D® ensures that a transformer provides voltage that remains as constant as possible despite changing grid and load conditions. In addition to voltage, other control variables such as active power, reactive power, or cos φ can also be used. Thanks to its 19-inch plug-in design, the REG-D® can be installed in various housings and subracks. Customer-specific wiring and the integration of additional components provide a very high degree of customization.
Typical Application:
- Voltage regulation of two- and three-winding transformers, with or without parallel operation
- Applications with multiple measuring points and transformer banks
- Phase-shifting transformers
- Variable shunt reactors (VSR)
- Transformer monitoring
This Device Is Suitable If:
- Simple or complex tasks involving the control and regulation of on-load tap changers need to be handled
- A voltage regulation system with additional components, such as a monitoring unit or a large number of inputs and outputs, is required
- Hardware replacement within minutes must be possible in the event of a device failure
- A high degree of hardware customization, such as customer-specific terminal assignments, is required
Transformer Monitor and Voltage Regulator
REG-D®
The REG-D® voltage regulator allows both very simple and highly complex measurement, control, and regulation tasks for tapped transformers. The REG-D® can also be used as a transformer monitor as per IEC 60354 or IEC 60076, as a transducer, recorder, statistical unit, and ParaGramer.
Further questions or want to start an enquiry? Please click “Product Enquiry”.
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.
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Cross-Product Downloads
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Product Overview A. Eberle
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REG-D®
REG-D®
Instruction Manual
Product and Safety Instructions
Virtual Instruction Manual
Instruction Manual TMM
Technical Data Sheets
Firmware
Change Log
Firmware
Short Instruction Manual
Unique Flexibility
Through our many years of experience in the industry, we know that every customer and every project has specific requirements. Accordingly, we have developed the transformer monitor REG-D® in such a way that it can respond very flexibly to these requirements, which is unique in this form. For example, the REG-D® offers a flexibly expandable number of inputs and outputs, a wide range of applications through software features, and free programmability.
19" Plug Technology As a Tried-and-Tested Model
The design of the transformer monitor REG-D® allows the installation in 19" subracks, wall-mounted and panel-mounted housings. Easy and simple replacement of the devices, customized housings, as well as wiring are made possible by the 19'' plug-in technology of the REG-D®. In addition, the configuration possibilities are inexhaustible, together with other products from A. Eberle, but also with devices from other manufacturers.
The Right Control Protocol for Every Application
The communication interfaces of the transformer monitor REGSys® have the possibility of role-based user administration (RBAC) incl. authentication via RADIUS.
REGSys® can communicate with a central control system via various protocols.
The following protocols are available:
- IEC 60870-5-101/103/104
- IEC 61850 (Server, Client, GOOSE, 9-2 Sampled values)
- DNP 3.0 via Ethernet
- DNP 3.0
- Profibus DP
- MODBUS RTU
- SPABUS
- LON (on request)
All Necessary Functions in a Single Device
The functional scope of our transformer monitor is unique. The control of 3-winding transformers, of phase-shifting transformers, of transformer banks and of compensation reactors as well as transformer monitoring is all possible with only one device and one firmware.
Parallel Operation With up to 15 Transformers
The REG-D® allows parallel operation of up to 15 transformers. The parallel program Master-Follower as well as various programs for circuit reactive current minimization (with and without communication between the controllers) are available. The ParaGramer serves as an aid for the automatic recognition of parallel circuits and for the visualization of the switching states. The ParaGramer maps the switching situation of the individual transformers in single-phase representation and enables automatic detection of parallel operation by evaluating the switch positions.
AETooblox
The Perfect Supplement to the REG-D®
The AEToolbox works on a project basis and impresses with its range of functions and the versatility that the program offers. Using the software, the parameters of connected products can be adjusted and administered, and the continuously recorded data (logbook entries and recorder data) downloaded, visualised and saved.
Auxiliary Components
Accessories for Our Voltage Regulators
News From the Productgroup
REGSys® - News
Blogpost
GRUNDIG AKADEMIE visits A. Eberle
7. August 2026
In 2026, the GRUNDIG AKADEMIE Nuremberg visited A. Eberle with a group of trainee technicians. During the visit, the participants gained an insight into our company, technical fields of work and potential[...]
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Blogpost
A. Eberle named one of the TOP 100 Innovators for 2026
22. July 2026
As part of the 2026 TOP 100 Awards, we had the honour of receiving a special accolade in Heidelberg last week – presented in person by Christian Wulff, former Federal President and mentor of the TOP[...]
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Webinar
»REGSys®« Webinar: New Requirements and Application Cases for Voltage Regulators in MV/HV-Grids
18. June 2026
Webinar recording from 2026-06-10: »REGSys®« New Requirements and Application Cases for Voltage Regulators in MV/HV-Grids[...]
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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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General Knowledge
Transformer Monitoring
28. April 2026
Transformer monitoring helps detect critical operating conditions early, reduce outages and improve the safe operation of transformers in power grids and industrial systems.[...]
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Blogpost
A. Eberle and Bregal Unternehmerkapital enter into a growth partnership
14. April 2026
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
24. November 2025
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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Blogpost
A. Eberle welcomes Amarillo as a new REGSys® partner in Mexico
20. October 2025
A. Eberle is expanding its international partner network and is pleased to welcome »Amarillo Naranja S.A. de C.V.« as a new »REGSys®«-partner in Mexico.[...]
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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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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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General Knowledge
Voltage Stabilisation
7. July 2025
In this article, you will learn why voltage stabilisation in high, medium and low-voltage grids plays a central role in safe and efficient grid operation. You will learn the basics of ‘voltage stabilisation’[...]
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Training Video
»REGSys®« Training Video 8: Overview SCL-Config for IEC 61850
28. January 2025
In this video you will learn how you can export a CID file, how to adjust the IED name and working with the SCL-Config.[...]
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Training Video
»REGSys®« Training Video 7: How to Use the Winconfig Software
28. January 2025
In this video you will learn how to create a new parameter file, how to upload setting files or download setting files from the Scada card and what kind of parameters a setting file contains.[...]
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Training Video
»REGSys®« Training Video 6: Firmware Update via Winconfig
28. January 2025
In this video you will learn when it is reasonable to use the WinConfig for a firmware update and how to do a firmware update with the WinConfig.[...]
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Training Video
»REGSys®« Training Video 5: Firmware Update via RPL2
28. January 2025
In this video you will learn how to create a physical connection before the firmware update, how to use the RPL2 software and how to do a small test after the firmware update.[...]
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Training Video
»REGSys®« Training Video 4: Changing the Default Password
28. January 2025
In this video you will learn how to connect the SCADA card to your computer, start the software WinConfig and change the default password and define a new one.[...]
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