Elprom Trafo. Address: Kyustendil, Bulgaria, Dondukov Str. The factory was established in year under the name “Elprom Trafo” with its main activity being manufacturing of MV/LV Distribution Transformers. Elprom Trafo CH is company for Electrical Equipment in Kyustendil. Informaton about the company and its activities.

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These are performed upon special request of the customer.

For each rated power we offer different series, depending on the no-load and load losses. The active part is fixed to the tank cover and is supported by the tank bottom.

The LV winding is situated at the core limb and is foil cylindrical type made out of profiled section copper for the ratings including kVA and out of copper foil for ratings kVA and above. We also have another advantage — the especially for us designed software for optimal design of transformers. High quality of the welding seams is guaranteed by tests with penetrating agents in a special test field and by testing with over pressure of 40 kPa.

The fitting elements bolts, nuts, washers etc. Nowadays we have control laboratories for incoming, current and outgoing control of the materials, used in the production, as well as testing laboratory for routine and type testing of the transformers.

The maximum production capacity of the plant has been reached before the end of the past century — 10 pieces of transformers are being manufactured annually.


Upon request the tank and cover are hot-dip zinc galvanized.

Contemporary lines for elpromm corrugation and plasma welding produce the tank walls. Special epoxy resin bushing and plug-in cable connector at the HV side Elastimold system optional. Using the scroll is also considered to be a consent!

The outer surfaces are coated by several layers of anti corrosion primer and finished by high quality alkyd enamel.

Axial bolts do the axial tightening of the windings. Each coat is dried up in electric ovens. The transport carriage with wheels is fitted to the tank bottom allowing bi-directional movement of the transformer. Not exactly what you want?

Elprom Trafo CH PLC – Power, distribution, transformers

The windings are of cylindrical type situated concentrically on the core elorom. You, our customers know well that without solid foundation and clear goals there is no development, and we have both. We can now shorten the production period to a maximum and this way — spare your time. The HV winding is a multi-layer one for the lower ratings and two- or four-section multi-layer, block-coils or continuously wound disk winding for the higher ratings.

The plant introduces a good working system, organized and maintained by high quality experts. We have special design and technological departments, thereby the production cycle becomes fully closed — from the design of the transformer to its assembly, in accordance with the requirements of the end customer and every related national and international standard.

Elprom-trafo SN AD

TANK The standard trsfo of the transformer tanks is rectangular a welded structure with corrugated walls made out of cold rolled steel sheets with low carbon content.


Buchholz relay over kVA Conservator for TM series This is our path through the years — a path of tradition and continuous renewal. At the bottom the walls are welded to the tank bottom. We are on the market since The optimal design of the windings and employment of most contemporary technology, the optimal selected cooling ducts, properly dimensioned insulation, effective tightening tarfo radial and axial direction result in a high electrical, thermal and dynamic withstand capability according to the requirements of IEC.

Oil-draining and sampling valve DIN 9. Dial rtafo – thermometer with alarm contacts over kVA. Our production is maximally extended — we manufacture the full range of oil immersed distribution transformers with rated power from 25kVA up to 10 kVA.

Off-load tap-changer driving mechanism 5. In the upper part the walls are welded to a flange frame to which the tank cover is bolted. This site uses cookies.

Elprom-trafo Sn Ad, Ul. Dondukov 63 , CO. REGISTRATION NO

The leads from the HV winding are insulated with thick insulation paper layer and insulation tubes el;rom press board. The combinations of LV foil winding and multi layer HV winding results in a significant reduction of the axial electrodynamics forces at short circuit for the high ratings.

The voltage is regulated at the HV side by means of an off-load tap-changer when the transformer is de-energized.