A substation connects power grids of different voltage levels. Here, for example, the high-voltage level is stepped down to medium voltage before the energy is distributed further to local substations and end consumers. Substations are the heart of the power supply. Substations are complex technical structures whose planning, construction, and operation require deep interdisciplinary expertise.
How is a substation structured?
A typical substation includes one or more power transformers, busbars at different voltage levels, metering and protection equipment, control technology, and the necessary auxiliary power supply. Depending on their size and importance, substations are built as indoor or outdoor installations and can handle anywhere from a few megawatts to well over a thousand megawatts.
Key Characteristics at a Glance
- Connects high voltage and medium voltage
- Power transformers as the central element
- Metering and protection transformers in modern designs
- Protection and control technology to modern standards (e.g. IEC 61850)
- Often designed with redundancy for maximum availability
- Double busbar arrangement for maximum availability
- Auxiliary power supply with redundant auxiliary circuits
Frequently Asked Questions
Why are substations often designed with redundancy?
A substation failure can affect a very large number of consumers. Redundant design with duplicated transformers, busbars, and protection circuits ensures that supply is maintained without interruption, even during maintenance or individual faults.
How long does it take to build a new substation?
From planning through permitting to commissioning, three to five years must often be allowed. The regulatory approval process and nature conservation requirements alone often take one to two years. Early planning is therefore essential.
What characterizes a modern digital substation?
Digital substations use IEC 61850 for all internal communications, largely replace copper cabling with fiber optics, and use so-called merging units to digitize analog measured values. This significantly reduces engineering effort, cabling, and sources of error.
What investment sums are typical for a new substation?
Depending on the voltage level, size, and location, costs range from 5 to 50 million euros, and considerably more in special cases. The main cost drivers are transformers, protection and control technology, land costs, and construction effort. Careful planning and engineering are decisive here.
Are you planning a new substation or the modernization of an existing site? We supply transformers and instrument transformers as well as technical engineering – contact us.