transformer manufacturer

The internal components of a transformer consist of a core, windings, and connecting cables. High-quality drying and rapid filling of insulating oil play a crucial role in extending the service life of the transformer. Delixi Electric employs the latest technology. For example, in vacuum low-frequency equipment (LFH—Low-Frequency Heating), the drying process of solid insulation is combined with vacuum drying of the windings through low-frequency heating. The active part is heated by applying a low-frequency current (< 1 Hz) to the high-voltage winding while the low-voltage winding is short-circuited. Before being put into service, the transformer is filled with preheated insulating liquid, which is absorbed by the insulating materials to prevent oxygen ingress.

The core forms the key component of each transformer. Computer-controlled machines precisely cut advanced cold-rolled metal sheets and laser process them as required to ensure minimal tolerances. Then, the individual sheets are assembled into a core using step-lap technology, or for lower-rated transformers, they are assembled into a core using precision winding technology. In this way, Delixi oil-immersed distribution transformers achieve particularly good magnetic flux distribution at the joints, resulting in extremely low losses and minimal noise.

Transformer windings are subjected to extremely high electrical and mechanical stresses and therefore must be protected. The transformer windings of Delixi distribution transformers are made of copper or aluminum. Low-voltage windings are made of strip or flat wire, while high-voltage windings are made of round or shaped wire. Insulation paper partially coated with epoxy resin (diamond dotted paper) is used to bond the windings into a dense block during the drying process, additionally increasing short-circuit capability.

Layer insulation adapts to AC voltage strains that occur in daily operation. Large oil channels ensure adequate cooling of the windings, preventing hot spots. All leads are equipped with short-circuit and surge protection, contributing to the high stability of Delixi transformers and achieving an above-average service life.

The tank must remain sealed under mechanical stress in all circumstances. The surface is sandblasted and then multi-layer coated to achieve the highest level of corrosion protection. The oil tank of a distribution transformer must dissipate all heat losses. In sealed transformers, corrugated walls absorb the volume changes of the insulating liquid. Alternatively, the transformer can be designed as an open system or equipped with a conservator to compensate for additional volume. In some areas, smooth-walled tanks and built-in radiators are also used. Sealed devices sometimes have air or gas cushions to compensate for oil expansion. The steel cover is bolted (or welded upon request) to the tank. The thickness of the steel and the dimensions of the supports ensure that the cover withstands all necessary stresses.

Delixi transformers are only shipped to customers after passing final inspection and testing. Each Delixi transformer plant is equipped with high-voltage testing equipment, and technical experts conduct various transformer tests, from voltage and temperature rise tests to insulation resistance, partial discharge measurement, and special tests for harmonics and noise levels. Special tests for short circuits, vibration, and other conditions are conducted at internationally recognized and accredited institutions. Delixi Electric tests according to applicable standards and provides additional certificates upon customer request.