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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Type tests are performed on each transformer type. We can now shorten the production period to a maximum and this way — spare your time. They have an insulation of cable paper or enamel resistant to hot transformer oil. 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 leprom requirements of the end customer and every related national and international standard.

For more than 10 years now the plant has an established and certified quality management system acc. 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. We trato 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. Welding is done in protective atmosphere Ar-CO2. You, our customers know well that without solid foundation and clear goals there is no development, and we have both. These are performed upon special request of the customer. Dehydrating breather for TM series Upon request the tank trsfo cover are hot-dip zinc galvanized.


This is our path through the years — a path of tradition and continuous renewal. The fitting elements bolts, nuts, washers etc. Contemporary automated lines cut the steel sheets delivered in rolls longitudinally and transversally.

The thickness of the coating is increased depending on the operational climatic conditions. Special epoxy resin bushing and plug-in cable connector at the HV side Elastimold system optional. Thus it remains stable during transportation.

Elprom Trafo CH PLC

Buchholz relay over kVA We are on the market since The voltage is regulated at the HV side by means of an off-load tap-changer when the transformer is de-energized. Dial type – thermometer with alarm elpro, over kVA. Off-load tap-changer driving mechanism 5. The transport carriage with wheels is fitted to the tank bottom allowing bi-directional movement of the transformer.

Axial bolts do the axial tightening of the windings. The windings are of cylindrical type situated concentrically on the core limbs. Not exactly what you want? The active part is fixed to the tank cover and is supported by the tank bottom. 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. 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. For each rated power we offer different series, depending on the no-load and load losses. One decade later the plant achieves significant development, it is renewed technologically, expands and the production range is extended.


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 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. Special tests are performed on each transformer type including short-circuit test and noise level measurement. Conservator for TM series At the bottom the walls are welded to the tank bottom.

Rating plate trfo diagram 4. 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 inner parts of the core and coil assembly are coated by an oil resistant enamel. 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. Oil-draining and sampling valve DIN 9. China dry transformer kva China transformer w China transformer kva toroid.

The off-load tap-changer is situated vertically between two adjacent phases. These include temperature rise test and lightning impulse test. Our production is maximally extended — we manufacture the full range of oil immersed distribution transformers with rated power from elprrom up to 10 kVA. This site uses cookies.