Electrical transformers for power stations

Dramatically reduce lead time

by choosing a Brunstock power transformer

Instead of waiting for the manufacture of electrical transformers, and suffering from lead time blow-outs, you may be able to energise your substation in half the usual time with a Brunstock transformer.

Get in contact with your local Brunstock rep today!

Our oil-immersed power transformers are rated up to 220kV and are type tested to IEC standards in KEMA (DNV) and ASTA. In the interest of keeping fossil fuels in the ground, we can offer non-mineral oils like ester oil.

Brunstock transformers include various types, such as hermetically-sealed, dry-type, amorphous alloy, pad-mounted, and other special transformers used in electrical furnaces, rectifiers, mines, lightning protection, arcs, as well as for current and voltage transducers. Brunstock can supply a wide range of series, types and specified transformers, with a manufacturing partner that has ample annual production capacity.

These transformer models have undergone theoretical analysis and simulation experiments in main insulation, longitudinal insulation, and the characteristics of winding impulse withstand voltage.

First-class power transformers

Quality control and management

Our manufacturing partners use advanced equipment for production, processing and testing to achieve high-quality power transformers that perform as expected. They have certificates for ISO 9001, ISO 14001, ISO 50001 and ISO 45001 for their company and European conformity (CE) certificates for their products. These quality control and management systems ensure the reliability and performance of Brunstock products.

Our transformers are available in:

220kV
110kV
66kV
35kV

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220kv electrical transformer

Brunstock’s 220kV transformer features advanced electric, magnetic, thermal and mechanical computing software to calculate electromagnetic
field and magnetic flux leakage distributions, to analyse wave processes, and to select reliable insulation margin, thus to guarantee product reliability.
The transformer has a multilevel stepped lap helical structure to reduce no-load losses and noise. Its core is supported by inside rods and its winding includes cardboard tubes to enhance its short-circuit withstand capacity. It also uses baffle plates to direct the oil flow for reduction of winding temperature rise. Heterotypic radiators are applied to improve the cooling centres and reduce oil temperature rises. All internal insulating parts and metal structural parts have rounded processing for the reduction of partial discharge.

The Brunstock 220kV power transformer’s core is automatically cut with high precision and few burrs. It works without folding the upper yoke, with
surface coated double H curing adhesive and fastening. Our factory has vertical winding machines with digital control tension devices. The
active part of the transformer adopts phase-assembly technology, and the lead is wholly pre-fabricated. Kerosene vapor-phase drying is
controlled automatically.

Brunstock’s manufacturing partners strictly control the quality of our products according to ISO 9001 standard. Our 220kV transformer has passed a complete set of third party type tests, including a short-circuit withstand test. To meet the needs of our product’s end users, Brunstock can provide
products of other voltage ratios, vector groups, and rated capacities, as listed in the upcoming tables.