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MDACI offers advanced substations (Transmission substation, distribution substation, and collector substation, etc.) provided with sophisticated...

MDACI offers advanced substations (Transmission substation, distribution substation, and collector substation, etc.) provided with sophisticated equipment and elements consisting of lines (primary and secondary lines), ground wire, transformer for measurement of electric voltage, disconnect switch, circuit breaker, current transformer, lightning arrester, main transformer, control building, security fence, secondary power lines.

MDACI’s researchers and experts lay emphasis on developing new technologies that would increase capacity, availability and limit maintenance, as well as addressing the issues of size, speed and automation. To reduce cost for our business partners and clients, MDACI is also working on the introduction of a modern and sophisticated substation – called pre-fabricated indoor substation – which allows for quick and easy on-site installation, something that shortens the total project time and minimizes disturbances to neighbors. At the same time, the quality of the supply is higher due to complete factory testing before shipping. On-site assembly and testing only takes one week, after which the substation is ready. The substation consists of three main modules.


  • A power transformer module consisting of the main power transformer, a prefabricated foundation that also acts as an oil-pit, walls and a roof;
  • A high-voltage (HV) module, which is equipped with a removable compact 52,5 kV circuit breaker. This module requires no foundations as it is hinged onto the side of the power transformer module;
  • A medium voltage (MV) module whose indoor switchgears are mounted in cubicles. In this module relay, control and auxiliary AC/DC equipment for the entire substation is included. Like the HV module, it is also hinged onto the transformer module.

Replacing traditional instrument transformers with optical sensors further reduces the switchgear footprint while at the same time providing secondary equipment that is more flexible and secure.

As well as its small footprint and quick assembly time, This substation, when compared to the traditional solution, offers: higher availability because the equipment is indoors; lower maintenance and rounding costs; the substation, including its foundations, can be quickly dismantled and moved; it is environmentally friendly; and finally, it is personnel and third-party safe.

Our mission also includes the development of substation secondary systems, which like its primary counterpart, have also changed a lot over the years. For example, the days of manual operation have been replaced by a more sophisticated form of information management. The secondary system in a modern substation is used for:

  • Primary system protection and supervision;
  • Local and remote access to the power system apparatus;
  • Local manual and automatic functions;
  • Communication links and interfaces within the secondary system;
  • Communication links and interfacing to network management systems


All of these functions are performed by a substation automation system (SAS), which contains programmable secondary devices, known as intelligent electronic devices (IEDs), for control, monitoring, protection and automation. Typical characteristics of an IED include:


  • It can be used for one or more switchgear bays;
  • It contains independent protection functionality for each feeder;
  • It performs high-speed calculations in real-time, which will trigger a trip signal if necessary;
  • The IED is intended as a combined protection and control device, but it can just as well function as a separate control or protection device;
  • It can communicate with all other IEDs


In the future, substation power handling equipment will be even more integrated and compact, while measuring functions and all of the secondary functions will be done using fiber optics. In other words, tons of porcelain, copper and iron will be superseded by just a few fiber-optic connections. This will further speed up the delivery process, reduce the substation footprint, and make it more environmentally friendly

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