Medium Voltage Transformer

Selecting a medium voltage transformer is not only about kVA.

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Medium voltage transformers operate on the primary side at 11 kV, 22 kV or 33 kV — the voltage levels used for regional distribution and for large industrial and commercial intake substations.

Selecting a medium voltage transformer is not only about kVA. Insulation level (BIL), vector group, impedance, tapping range and the short-circuit withstand capability of the winding all have to match the network you are connecting to. We engineer each unit against your network data so it can be installed and energised without site modification.

Technical Specifications

Parameter	Typical Value
Rated capacity	500 – 3150 kVA (higher on request)
Primary voltage	11 kV / 22 kV / 33 kV
Secondary voltage	400 V / 415 V / 433 V / 690 V
Frequency	50 Hz or 60 Hz
BIL / insulation level	Per IEC 60076-3 for the system voltage
Vector group	Dyn11, Dyn5, Yyn0 (as specified)
Impedance	4% – 8% depending on fault level
Cooling	ONAN / KNAN / AN / AF
Tap changer	Off-circuit ±2 x 2.5% (OLTC on request)
Standards	IEC 60076 / IEEE C57.12
Installation	Indoor substation, outdoor kiosk or pad mount

Typical values for this product family. Insert your certified datasheet values before publication — Hebei Youge Electrical Equipment Co., Ltd..

Applications

Industrial intake substations
Factory MV/LV distribution
Commercial building substations
Data and process facilities
Renewable and cogeneration connection
Utility-style distribution points

Advantages

Designed against your actual network fault level and BIL requirement
Correct impedance selection to limit downstream short-circuit current
Off-circuit or on-load tap changing to handle network voltage variation
Compatible with RMU, switchgear and protection panels
Suitable for indoor substations and outdoor enclosures
Full routine testing with certified test reports

Customization Options

Manufacturing, Testing and Standards

Every unit is built under documented process control and subjected to routine tests before dispatch: winding resistance, voltage ratio and vector group, impedance voltage and load loss, no-load loss and current, applied and induced voltage dielectric tests, and functional checks of accessories. Type tests — including lightning impulse, temperature rise and short-circuit withstand — are available for new designs and project requirements. See our testing and quality control pages.

Frequently Asked Questions

What is considered medium voltage?

In power distribution practice, medium voltage generally covers 1 kV up to 36 kV. The most common distribution levels are 11 kV, 22 kV and 33 kV.

How do I choose between 11 kV, 22 kV and 33 kV?

It depends entirely on the supply available at your site and on the utility’s distribution standard. Higher primary voltage means lower current and lower cable losses, but requires higher insulation level and more expensive switchgear.

Do you supply the switchgear as well?

Our focus is the transformer itself. We coordinate the interface — bushings, cable boxes, protection signals — with your switchgear supplier. Hebei Youge Electrical Equipment Co., Ltd. if you also supply packaged substations.

Can you match an existing failed unit for replacement?

Yes. Send us the nameplate data and, where possible, the dimensional drawing and terminal arrangement. We will confirm a replacement or an equivalent modern design with matching footprint.