A mobile substation, as the name suggests, is a portable transformer solution used for temporary or emergency situations in the transmission and distribution of electrical energy. Typically mounted on trailers or semi-trailers, these systems are designed to ensure the continuity of energy supply thanks to their ability to be quickly commissioned.
Mobile substations come into operation when fixed substations become unusable, preventing interruptions in the flow of energy. This provides a quick solution both during planned maintenance processes and in case of malfunctions. Furthermore, they are an indispensable solution in scenarios where energy needs must be met quickly, such as in newly established residential areas, large-scale construction sites, or disaster zones.
Why do we need mobile transformer substations?
Today, tolerance for power outages is quite low. Outages in both residential areas and energy-intensive facilities such as hospitals, factories, or schools can have serious consequences. In such cases, when fixed substations are insufficient or out of service, mobile substations can be quickly activated to meet temporary power needs.
If the capacity of an existing substation in a region is insufficient, or if it needs to be upgraded to meet TEDAŞ (Turkish Electricity Distribution Company) standards, mobile substations are temporarily activated to prevent the region from being without power during this process. They also offer flexible solutions to grid needs in scenarios such as population growth, migration waves, or sudden load increases in industrial areas.
What is the difference between mobile transformers and standard, conventional transformer substations?
Standard fixed substations are installed in open-field configurations if high voltage is present in the system, and in concrete or prefabricated enclosures if medium voltage is present. These include building-type substations, gas-insulated GIS substations, or open-type substations. However, the installation, commissioning, and testing processes of these fixed systems can be time-consuming. Mobile substations offer temporary solutions that bridge this gap.
For example, converting an existing substation into a modern GIS substation can take weeks or even months. Mobile substations are preferred for areas with limited power supply.
Applications of Mobile Transformer Substations
Mobile substations play a critical role not only in maintenance processes but also during disasters and crises. Energy infrastructure can be damaged during natural disasters such as earthquakes, floods, and storms, or during extraordinary situations like war. In such conditions, mobile substations can be deployed to meet the need for temporary and reliable energy, ensuring the uninterrupted operation of hospitals, military facilities, or critical production centers.
In large infrastructure projects, such as dam or tunnel construction, the energy demand on site is both high and dynamic. In such locations, transmitting energy over long distances at low voltage levels of 400V is impractical; both losses increase and the cable cross-section becomes larger. Therefore, it is necessary to transmit energy at medium voltage and reduce it to low voltage at points close to the construction site. This is where mobile substations come into play.
Furthermore, mobile substation systems are highly suitable for rapid installation and energy access in areas inaccessible to infrastructure, such as military bases or factories in mountainous regions.
At what voltage levels are they used?
Mobile substations can be used temporarily at 154 kV and 380 kV levels during maintenance, fault repair, or temporary commissioning processes of high-voltage lines, or when there is a fault or maintenance in open-type step-down and step-up substations. Such applications are generally geared towards the needs of transmission-level operators such as TEİAŞ (Turkish Electricity Transmission Corporation). Integrated onto GIS (Gas Insulated Switchgear) systems, they offer both a safe and compact structure. Although fewer examples exist at medium-voltage levels, they can be preferred as an alternative to building-type substations.
Advantages of Mobile Transformer Substations
The main advantages offered by mobile transformer systems are:
Portability: They can be easily transported to the desired location.
Fast commissioning: Installation and commissioning can be completed in a short time.
Low investment cost: It can be more economical than fixed installation.
Flexibility: It can be adapted to different scenarios for temporary and permanent needs.
Compact structure: It takes up little space and requires minimal infrastructure.
In today’s conditions where uninterrupted energy supply is essential, mobile transformer substations are used not only for sudden failures but also in many areas such as maintenance, infrastructure renewal, capacity development, and crisis management.