Box-Type Substation (Prefabricated)
A factory-assembled compact substation integrating transformer, HV/LV switchgear, and protection in a weatherproof enclosure.
A box-type substation (prefabricated or package substation) is a complete MV to LV transformation unit, factory-assembled and tested. Includes the transformer, MV/LV switchgear, protection devices, and interconnections.
Advantages: reduced installation time (days vs. weeks), lower civil costs, factory quality assurance, compact footprint. Used in urban distribution, renewable energy, industrial facilities.
QDTB manufactures prefabricated substations from 100 kVA to 2,500 kVA, fully factory tested. Designs comply with IEC 61336. See our new energy solutions guide for renewable applications.
Related Products
Related Terms
Prefabricated Substation
A factory-assembled complete substation integrating transformer, switchgear, and protection for rapid installation.
Distribution Transformer
A transformer stepping down voltage from the distribution network (11-33 kV) to utilization voltage (400/230V) for end consumers.
Switchgear
Equipment for switching, controlling, and protecting electrical circuits including breakers and relays.
More Terms Starting with “B”
BIL (Basic Impulse Level)
The ability of transformer insulation to withstand high-voltage surges from lightning or switching, measured in kV peak.
Buchholz Relay
A gas-actuated protective relay between transformer tank and conservator detecting internal faults by sensing gas accumulation.
Bushing
An insulated device allowing a conductor to pass through a grounded barrier while maintaining insulation integrity.
Busbar
A metallic strip conducting electricity within switchgear, transformers, and distribution equipment.
More in “Transformer Types”
Autotransformer
A transformer with a single winding acting as both primary and secondary, providing voltage conversion through electromagnetic induction and direct electrical connection.
Amorphous Alloy Transformer
A distribution transformer using amorphous metal core material achieving 60-70% lower no-load losses than conventional silicon steel cores.
Cast Resin Dry-Type Transformer
A dry-type transformer with windings encapsulated in epoxy resin for fire safety and moisture resistance indoors.
Frequently Asked Questions
What is the difference between a package substation and a prefabricated substation?
They are the same product: a factory-assembled MV/LV substation inside a weatherproof enclosure. Package substation (or packaged substation) is the usual name in IEC markets, while prefabricated substation, compact substation, box-type substation and pad-mounted substation describe the same construction or its regional housing style. QDTB supplies European-type (compartmented) and American-type (pad-mounted) designs.
What voltage and capacity range do package substations cover?
QDTB package substations are built from 100 kVA to 2,500 kVA with 10/0.4 kV, 20/0.4 kV or 35/0.4 kV ratios. The enclosure is rated IP33D–IP44 and the MV section is typically 630 A; designs follow IEC 61330 / GB/T 17467, with IEEE C57.12.28 for the American pad-mounted type.
How long does it take to install a package substation?
Because the unit is assembled, wired and tested in the factory, site work is limited to foundation or pad preparation (1–2 weeks) plus placement and connection (1–3 days). A typical project is energised in under three weeks, against three to six months for a site-built substation of the same rating.
Need help with transformer selection?
QDTB engineers can help you choose the right equipment based on your specific requirements