Medium-Power Oil Distribution Transformers

Oil distribution transformers are used to transform medium-voltage electrical energy (6 kV to 35 kV) to low voltage (400 V to 433 V) with power ratings from 315 kVA to 1,250 kVA. They are hermetically sealed, with the active electrical parts enclosed in a tight tank completely filled with oil or another insulating fluid, including biodegradable fluids.

They are designed for installation in traditional transformer stations. These transformers are completely maintenance-free.

Specifications

Basic electrical parameters:

Rated power in kVA: from 315 to 1,250
Rated primary voltage in kV: 6.3, 10.5, 15.75, 21, 31.5, or other values within the range of 6 kV to 35 kV
Rated secondary voltage in V: 400, 410, 420, or 433
Off-voltage regulation: ± 2 x 2.5% or ± 3 x 2.5%
Connection group: Dyn5, Dyn11
Short-circuit voltage: 4%, 4.5%, or 6%
No-load and load losses: compliant with the EU Eco Directive Tier 2 or individual customer requirements.
If you are interested in other parameters, please contact us – further details can be provided upon request.

Medium-Power Oil Distribution Transformers

The transformer tank, made from flexible steel corrugated walls, guarantees tightness and proper cooling of the transformer. Depending on our clients’ requirements, we provide anti-corrosion protection/protective coatings, ensuring resistance and durability for products operating even in the most demanding conditions.

On the transformer cover, there are high-voltage (HV) and low-voltage (LV) bushings, an oil filler, a tap changer head, and other equipment agreed upon with the client. The insulating fluids most commonly used are mineral oils — which may be inhibited or uninhibited. Alternatively, biodegradable vegetable oil, a mixture of fatty acid esters derived from plants, or fluids based on synthetically produced fatty acid esters can also be used as the insulating fluid.

Want to learn more? Feel free to contact us.

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