The current injection system can be retrofitted at any time and provides a space-saving solution for low or highly fluctuating displacement voltages. It supports reliable grid operation and prevents unnecessary wear of the arc suppression coil.
Typical application:
- Compensated grids with central and/or decentralised arc suppression coils
- Low or highly fluctuating displacement voltages, particularly in highly symmetrical grids
- Can be retrofitted at any time to an existing REG-DP or REG-DPA
This device is suitable if:
- Conventional control by “moving the coil” no longer delivers reliable results
- The displacement voltage is below 0.5% and may be strongly influenced by fluctuating loads or external grids
- The arc suppression coil has an integrated power auxiliary winding
Multi-Frequency Current Injection
MCI
The classic regulation process, i.e. searching for the resonance curve across the range of travel of the coil, can no longer successfully adjust the arc suppression coil in certain network situations. We have developed this multi-frequency current injection for the increasingly frequent cases where the zero-sequence voltage is highly disturbed or subject to extreme influences or where networks are highly symmetrical. The current injection creates a signal that is fed into the network via the auxiliary power winding of the arc suppression coil. From the network reaction, the combined REG-DP(A) and current injection are able to calculate a resonance curve despite the low or highly variable zero-sequence voltage.
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.
Cross-Product Downloads
Cross-Product Downloads
Special Publications
WinEDC
Product Overview A. Eberle
A. Eberle Seminars in Nuremberg
MCI
MCI
Technical Data Sheets
Instruction Manual REG-DP(A)
Compact Dimensions, No Inductors and No Additional Voltage Transformer Necessary
Thanks to the multi-frequency current injection's compact form, it can fit into any existing control cabinet. During operation, up to eight different frequencies can be fed in directly via the auxiliary power winding of the suppression coil, i.e. without additional inductors, as required by other current injections. In addition, the MCI is able to both feed in power via the auxiliary power winding AND measure the zero-sequence voltage, without the feed negatively affecting the measurement. There is no need for zero-sequence voltage measurements to be decoupled from the e-coil.
Can Be Deployed for 20 kV Networks to 1300 A Ice
The multi-frequency current injection MCI can be used in 20 kV networks with average damping at up to 1300 A (capacitive earth current). The MCI can also be used in networks with lower or higher nominal voltages, whereby the maximum capacitive earth current will change in indirect proportion.
Includes Automatic Power Reduction
The multi-frequency current injection MCI can be used in 20 kV networks with average damping and up to 1300 A (capacitive earth current). For very small networks, the current injection can lead to undesirably strong influences on the zero-sequence voltage, meaning in the worst-case scenario that the earth fault threshold may be crossed. To prevent this, the MCI monitors influences on the zero-sequence voltage and reduces them as needed automatically. The MCI can also be used in networks with lower or higher nominal voltages, whereby the maximum capacitive earth current will change in indirect proportion.
IO Cabling to MCI Also Possible Incl. Emergency Positioning
To simplify the cabling between the REG-DP(A), the MCI and suppression coil, the I/O signals (peak/trough commands, limit switch, potentiometer) can be wired directly to the MCI. In this case, only the communication needs to be cabled between REG-DP(A) and MCI (“Mode 1”). If the communications line between REG-DP(A) and MCI fails, the MCI can carry out emergency positioning.
Parametrisation Control and Connection via REG-DP(A)
By connecting the MCI unit to the REG-DP(A) regulator, the MCI can be parameterised, calibrated and controlled. Connection via all standard communications protocols is also possible. The REG-DP(A) regulator can be connected via REG-P, REG-PE or REG-PEDSV control units. The following protocols are available (further protocols on request):
- IEC 60870 -5 -101 / 103 / 104
- IEC 61850
- DNP 3.0 RTU / DNP 3.0 TCP
- MODBUS RTU / MODBUS TCP
- SPABUS
Do You Have Questions About
Multi-Frequency Power Feed?
Our Specialists Will Be Happy to Help You!
Contact Us
AE Toolbox
The perfect supplement to arc suppression devices: freely adjustable project planning and parameterisation software
The AEToolbox works on a project basis and impresses with its range of functions and the versatility that the program offers.
Further products for earth fault compensation
Discover our wide range of products
News From the Product Group
EORSys - 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[...]
Read more
Webinar
»EORSys« Webinar: Integration of Future-Proof Secondary Substations Into the Distribution Grid - Part 2 | A. Eberle
27. July 2026
Webinar recording from 2026-07-15: »EORSys« -Integration of Future-Proof Secondary Substations Into the Distribution Grid with EOR-1DS & EOR-3DS - Part 2[...]
Read more
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[...]
Read more
General Knowledge
Digital Substation
17. June 2026
A digital secondary substation combines measurement, fault location and secure data analysis to improve transparency across medium- and low-voltage distribution grids.[...]
Read more
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.[...]
Read more
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.[...]
Read more
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[...]
Read more
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[...]
Read more
Webinar
»EORSys« Webinar: Integration of Future-Proof Secondary Substations Into the Distribution Grid - Part 1 | A. Eberle
15. October 2025
Webinar recording from 2025-10-15: »EORSys« -Integration of Future-Proof Secondary Substations Into the Distribution Grid with EOR-1DS & EOR-3DS - Part 1[...]
Read more
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.[...]
Read more
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«. [...]
Read more
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[...]
Read more
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.[...]
Read more
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)[...]
Read more
Blogpost
Further Growth at A. Eberle
14. July 2025
Welcome to the team! We welcome our new colleagues at A. Eberle.[...]
Read more
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.[...]
Read more
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.[...]
Read more
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«. [...]
Read more
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.[...]
Read more
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«. [...]
Read more
