Prefabricated Substation

Prefabricated Substation

Prefabricated substations, also called European substations, are compact integrated power distribution devices composed of high-voltage electrical equipment, transformers and low-voltage electrical equipment that are all independently set with each other and connected using cables.
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A prefabricated substation is similar to a substation and is usually located in cities and urban areas. You may find these substations along the side of the road, near businesses, in neighborhoods or near parks. They are often built to look like houses. With a prefabricated station, the manufacturer constructs most of the components. Once received, you will assemble it following manufacturer instructions.

High voltage compartment item unit Parameter
Rated frequency Hz 50 /60 Hz
Rated Voltage KV 3.3KV , 6.0KV, 6.6KV 10KV 11KV 13.8KV 15KV 20KV 22kv 30KV 33KV 35KV 36KV
Max service voltage KV 7.2 KV 12KV , 24KV 40.5KV
Rated current A 400, 630, 1000, 1250 ,1600, 2000, 2150,...etc
Transfer current A 1200 -3150 A
1MIN Power frequency withstand voltage , earth -phase KV 42/48, 85/95
1MIN Power frequency withstand voltage , phase/fracture
BIL KV 75/85, 170/185
Rated short circuit breaking current KA 20, 31.5
Transformer compartment Rated voltage KV 3.3KV , 6.0KV, 6.6KV 10KV 11KV 13.8KV 15KV 20KV 22kv 30KV 33KV 35KV 36KV
Rated power capacity KVA 200 KVA Upto 2.5 MVA
Tapping range % ±2 X 2.5% , ±5%
Vector group   Yyn0, Dyn11
Short-circuit Impedance % 4.0 , 4.2, 4.5, 6, 8
Low voltage compartment rated voltage V 220, 380, 400, 415, 433, 440, 660, 690,800
main circuit rated current A 50 -4000
branch current A 5-800
Enclosure protection level  
HV compartment   IP33, IP65..
LV compartment   IP33
Transformer compartment   IP23
Noise level dB ≤ 50

Electrical substation transformer

Types of Prefabricated Substation

There are two main types of prefabricated substations – an integrated substation, also called a pad-mount transformer, and a combined substation, also known as a compact transformer. Each of these serves slightly different purposes, and you'll choose the best based on your situation's needs.

In an integrated substation, the transformer makes up the main body of the structure. It contains load switches and fuses inside its enclosure. The enclosure is sealed and insulated and requires little to no maintenance. You will need to prepare a pad before building the station. It tends to be smaller than other substations.

A compact substation has the same components – a transformer, a high-voltage switchgear, and a low-voltage distribution system. It differs from an integrated substation because each component has its own "room" within the substation. They are in a mu formation, which is more convenient, or a pin formation, which is more compact.

Applications of Prefabricated Substation

Prefabricated substations are suitable for use in industrial, commercial and residential locations. They are suitable for factories, mines, construction zones and more. Rural neighborhoods and businesses may also find prefab substations suit their needs better than conventional substations.

Construction sites may opt for a prefabricated station as they can easily move between sites. Some industries with a substation may purchase a prefabricated system as a backup. Because prefabricated stations are so easy to take down and reassemble, they are often used as backup power when a conventional substation is undergoing maintenance and repairs.

GNEE Prefabricated Substation factory

Substation transformer

Installation Case

Compact substation

 

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