Low-Power Oil Distribution Transformers

Oil distribution transformers, previously produced under the name MINERA, 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 50 kVA to 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 on overhead medium-voltage poles or for mounting in traditional transformer stations. Due to their exposure to weather conditions, we recommend products from this group with the highest corrosion resistance rating, C5. These transformers are completely maintenance-free.

Specifications

Basic electrical parameters:

Rated power in kVA: from 50 to 250
Rated primary voltage in kV: from 6 kV to 35 kV
Rated secondary voltage in V: 400, 410, 420, or 433
Off-voltage tap regulation: ± 2 x 2.5% or ± 3 x 2.5%
Connection groups: Dyn5, Dyn11, Yzn5, or Yzn11
Short-circuit voltage: 4% or 4.5%
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 – we will be happy to provide further details.

Typically, mineral oil is used as the insulating fluid — mineral oil can be either inhibited or uninhibited. Alternatively, biodegradable vegetable oil, which is a mixture of fatty acid esters derived from plants, or a fluid 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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