Prefabricated Substation
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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 | |||

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

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