Compact Substations

Compact substations are secondary transformer systems used in the distribution of energy for low voltage and medium voltage systems. Thanks to compact substation, energy can be distributed more reliably, thus these transformers have spread rapidly due to their high durability and low maintenance costs. Moreover, thanks to the features such as compact transformer taking up less space and low installation costs, it has enabled them to be used in special projects such as generator and compensation systems, control and signaling centers.

SMK series of monoblock concrete kiosk, SPK series of prefabricated concrete kiosks and SCK series of metal kiosks are manufactured by Aktif which are being used for transformer and distributions substations. Concrete kiosk, prefabricated concrete kiosks and metal kiosks are being used in general at electricity distribution, hospitals, power generating utilities, oil and gas, chemical, steel and iron industry, mining facilities.

What are the key characteristics of a compact substations?

At first glance, a compact substation appears complex and very large. The systems, which are mostly in the open air, require a lot of space in an open area. But also enclosed systems, which are much smaller and often found in cities, look impressive. If you look at it the components in detail, a clear structure can be seen. A compact substation must be easily accessible because a transformer weighing several tons requires good road, water or rail connections. The systems are therefore built in the immediate vicinity of the transport infrastructure.

Compact Substations Components

A compact substation basically contains the following components. However, this situation may vary depending on the project.

  • Electric power transformer
  • Capacitor banks
  • Bus bar system
  • Power lines and overhead lines
  • Earthing system
  • Isolators
  • Relay system
  • Electric protection device like MCB, MCCB
  • Conductors
  • Surge protection device



  • IP 23D protection class for SMK series of Monoblock Concrete Kiosk and SPK series of Prefabricated Concrete Kiosks.
  • IP 56 level of protection class for SCK series of Metal Kiosks.
  • SMK series of Monoblock Concrete Kiosks and SPK series of Prefabricated Concrete Kiosks are made from C35 type of heavy-duty use concrete.
  • SCK-1 series of Metal Sheet kiosks made from 3 mm steel sheets and SCK-2 series of Metal Sheet kiosks made from polyurethane.
  • Secure and tested earthing circuit systems.
  • Easy on transportation and commissioning, modular design and secure operation.
  • Natural ventilation for tropical climates.
  • For all types of Kiosks, special design for Metal Enclosed, Metal Clad and RMU in the High Voltage level
  • For all types of Kiosks, special design for AC-DC, protection, control and motor feeder panels in the Low Voltage level
  • Special design that enables for transformers up to 1600 kVA of oil and dry type to fit in Monoblock Concrete Kiosks and transformers up to 2500 kVA of oil and dry type to fit in Prefabricated Concrete Kiosks and Metal Kiosks.
  • Raised floor solution for all types of Kiosks.
  • Standard depth and height, different lengths available for Monoblock Concrete Kiosks and Prefabricated Concrete Kiosks
  • Flexible solutions available in dimensions of length, height and dept For SCK series of Metal Kiosks.
  • Availability in the number of doors and partition for Kiosks
  • Manufacturing as per type tests.
  • Topicalization option for corrosion protection.
  • 5 years of warranty. Aktif Group SCK-2 Compact Substations

How is compact substation design done? 

The design of a compact substation is a complex process, depending on the size of the system. As soon as a suitable location for a new substation has been found in a detailed planning and approval process, the competent authority grants approval for the construction of the compact substation. In addition to a building permit and other design relevants, this permit also includes a sound report and a report on magnetic and electrical fieldsEvery item of equipment within a compact substation design fulfills an important function. Their shape and function differ depending on the location and task size. They ensure that the entire facility is safe, reliable and can be operated. Line control panel - it connects the high voltage line with the bars. Transformer cubicle - this cubicle connects the transformer with the bar. As a special feature, the transformer is connected directly and not via a disconnector. Coupling switch panel - this switch panel is used to flexibly interconnect three bars.

Why should you use compact transformers in your projects?

  • Compact substations can be installed quickly and easily. While conventional transformer systems require excavation, compact substation require little space.
  • While it takes up less space due to its compact structure, it makes the electricity distribution safer.
  • Their costs are low due to their easy maintenance and low breakdowns. 
  • It is much more reliable than a standard transformer substation. It forms the infrastructure of the electrical system safely for many years with the IP protection class designed according to the request.
  • Compact substation can be easily redesigned against future changes with their modular structure. Thus, electricity investments with a much lower budget

The electrical current reaches the compact substations with an incoming line to the line disconnector with grounding switch leads. The specifications form the connection between the line and switchgear. The next step is the current and voltage converter in a device for monitoring and protection. The circuit breaker is the central element of a control panel. It switches the power on and off, both under normal conditions and in the event of a fault. The switchgear panel is the busbar disconnector connected to all bars. The transformer switchgear panels are connected to the bars. The transformer connects the different voltage levels.


Frequently Asked Questions

What is packaged substation? 

These substation are highly efficient and compact systems that provide the transfer between medium voltage and low voltage. This system are preferred because they can be easily integrated.

What are the different types of substations? 

Transformers have evolved for different purposes day by day. The diverse sorts of substations basically incorporate step-up substation, step-down transformer,  compact substation, underground distribution.

What is the difference between switchyard and substation? 

Switchyard is a much more comprehensive electrical station. Switchyard is mainly used for the transmission, interconnection, distribution or combination of electricity.  Transformer basically provides distribution of electricity at different voltages.

Is it safe to live near electrical substation? 

A transformer station does not pose a danger as long as they are maintained. Therefore, transformer systems have a regular maintenance plan. This is essential to prevent possible accidents.

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