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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For more than 10 years now the plant has an established and certified quality management system acc. High quality of the welding seams is guaranteed by tests with penetrating agents in a special test field tdafo by testing with over pressure of 40 kPa.

Our production is maximally extended — we manufacture the full range of oil immersed distribution transformers with rated power from 25kVA up to 10 kVA.

We are on the market since Thus a sufficient thickness of the protective coating of min. The voltage is regulated at the HV side by means of an off-load tap-changer when the transformer is de-energized. Using the scroll is also considered to be a consent! The plant introduces a good working system, organized and maintained by high quality experts. China for transformer China transformer kva rating China transformer. We have a developed and introduced automated system for management of the purchase orders, management system for the technical documentations and management system of the material base of the plant.

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 off-load tap-changer is situated vertically between two adjacent phases. Buchholz relay over kVA 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 CH Oil Filled Distribution Transformers 25-2500 KVA

This is our path through the years — a path of tradition and continuous renewal. The quality procedures, according to ISO Off-load tap-changer driving mechanism 5. Nowadays we have control laboratories traf 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. China dry transformer kva China transformer w China transformer kva toroid. Dial type – thermometer with alarm contacts over kVA.

The fitting elements bolts, nuts, washers etc. One decade later the plant achieves significant development, it is renewed technologically, expands and the production range is extended.

You, our customers know well that without solid foundation and clear goals there is no development, and we travo both. At the bottom the walls are welded to the tank bottom.

Contemporary automated lines cut the steel sheets delivered in rolls longitudinally and transversally. 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.

Oil filling venting plug The windings are of cylindrical type situated concentrically on the core limbs. The active part is fixed to the tank cover and is supported by the tank bottom. We also have another advantage — the especially for us designed software for optimal design of transformers.

The active part is lifted along with the cover by the lifting eyes situated on it.

Elprom trafo |

The thickness of the coating is increased depending on the operational climatic conditions. Thus it remains stable during transportation. Conservator for TM series Not exactly what you want? Special epoxy resin bushing and plug-in cable connector at the HV side Elastimold system optional.


For each rated power we offer different series, depending on the no-load and load losses. Rating plate and diagram 4.

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. Axial bolts do the axial tightening of the windings. In the upper part the walls are welded to a flange frame to which the tank cover is bolted.

The transport carriage with wheels is fitted to the tank bottom allowing bi-directional movement of the transformer. The optimal design of the windings and employment of most contemporary technology, the optimal selected cooling ducts, properly dimensioned insulation, effective tightening in radial and axial direction result in a high electrical, thermal and dynamic withstand capability according to the requirements of IEC.

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Elprom-trafo SN AD

The outer surfaces are coated by several layers of anti corrosion primer and finished by high quality alkyd enamel. Each coat is dried up in electric ovens. They have an insulation of cable paper or enamel resistant to hot transformer oil.

Welding is done in protective atmosphere Ar-CO2. The leads from the HV winding are insulated with thick insulation paper layer and insulation tubes and press board. Lifting lugs on tank cover The neutral terminal of the LV winding for all the transformers is brought out on the transformer cover through a separate bushing that is designed for the full rated current and is insulated for the highest voltage of the LV system.