Unit Substation

A unit substation steps down utility distribution voltages to ideal in-plant distribution voltages that match operating conditions. They can be applied inside or outdoors and consist of a close-coupled assembly made up of three main parts:

• Primary electrical distribution equipment
• A three-phase power transformer
• Secondary electrical distribution equipment

There are two types of unit substations: primary unit substations and secondary unit substations. The two configurations are defined by equipment voltage, rating of the transformer and the type of equipment incorporated within the assembly. The transformer is the major component of the assembly and understanding what type of technology to specify might be the most important design consideration when planning a unit substation assembly. Once the type of unit substation is determined, it is much easier to select the appropriate transformer.  

Advantages of unit substations

Unit substations provide many advantages compared to traditional approaches of stepping down utility distribution voltages. For example, the close-coupled design allows the transformer and electrical equipment to be located in close proximity to the load concentration, which minimizes the lengths of cabling and buses to reduce power losses and exposure to faults. This close-coupled design can also improve voltage regulation and service continuity.

Transformer selection

To meet specific application needs, unit substations can incorporate liquid-filled and/or dry-type transformers. Specialty transformer designs are also available enabling you to:

• Meet the challenges of space-constrained entry points, for example when access is limited by a freight elevator or doorway.
• Integrate a Vacuum Fault Interrupter with powerful intelligence and secondary sensing to dramatically reduce incident energy in downstream equipment, enhancing safety when working on energized equipment is necessary.
• Additionally, a transformer selection guide is available to help the decision-making process easier.

GNEE have strong R&D team and they have more than 16 years of transformer design experience and are familiar with lots of international transformer standards, such as IEC, IEEE / ANSI,CSA, etc. and instruments with more than 16 years'experience.Excellent and stable quality with best cost performance.Various payment term available.

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