YB12 Package Substation

What Is YB12 Package Substation?

The package substation is the single most cost-effective way to deliver a complete distribution point to a site with limited civil works. Because the assembly and the wiring are done in the workshop, the site scope reduces to foundation, cable termination and commissioning.

The YB12 is a three-in-one outdoor package substation: the high-voltage ring main unit, the distribution transformer and the low-voltage switchgear are installed inside a single prefabricated enclosure and connected in the factory. The customer receives a complete, tested distribution point that only needs cable connection on site, which removes most of the civil work and shortens the project critical path.

How It Works

High-voltage energy enters through the ring main unit section, where a load-break switch and fuse combination protects the transformer. The transformer steps the voltage down to 400 V and feeds the LV switchgear section, which carries the incoming breaker, the outgoing feeders and, where required, an automatic capacitor bank for reactive compensation. The enclosure uses a double-layer composite panel construction for thermal insulation and ventilation, and can be finished in stainless steel, aluminium, cold-rolled steel or colour-coated sheet.

• High voltage, transformer and low voltage integrated in one prefabricated enclosure.
• Double-layer composite panel enclosure with thermal insulation and natural ventilation.
• Transformer options: low-loss sealed oil-immersed or resin-cast / NOMEX paper insulated dry type.
• High-voltage section can be fitted with FTU for the four-remote functions (telecontrol, telesignal, telemetering and teleadjustment).
• Enclosure material and RAL colour to the site or utility requirement.

Typical Applications

• Industrial plants and construction site temporary supply
• PV power plants — step-up from inverter 0.4 kV to 10 kV
• Residential compounds, street lighting and municipal distribution
• Military facilities, mining camps and remote sites
• Commercial complexes, schools and hospitals without a dedicated substation room

How to Select

The transformer rating normally governs the whole package, because it fixes the enclosure dimensions and the outgoing feeder count that physically fits. Next, confirm the high-voltage arrangement: if the site is fed by a ring, the HV section needs an incoming and an outgoing ring unit; if it is a single feed, a transformer unit alone will do. Then fix the outgoing feeder schedule against the actual load list, and add the compensation only after the transformer rating is settled, since the compensation size is normally expressed as a proportion of the transformer capacity.