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TECHNICAL CONSTRUCTIONAL CHARACTERISTIC

TECHNICAL CONSTRUCTIONAL CHARACTERISTIC
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TECHNICAL CONSTRUCTIONAL CHARACTERISTIC

Product catalog summary

Technical Specifications and Construction Features of Oil Transformers

Insulators

Insulators are heavy porcelain type, compliant with UNEL standards. They are selected based on the rated current and insulation class of the transformer to ensure proper electrical isolation.

Core

The transformer core is made from grain-oriented silicon steel laminations with low loss characteristics. The laminations are cut at a 45° angle and assembled using a step-lap technique to minimize noise during operation.

Voltage Change-Over Switch

This switch is located under the transformer cover and can be operated externally to adjust the output voltage, allowing for voltage regulation.

Insulating Oil

The insulating oil meets chemical and electrical standards set by C.E.I. and I.E.C. It is dried and degassed before filling the transformer to ensure optimal insulation and cooling performance.

Casing

The transformer casing is constructed from sheet steel and steel profiles. Cooling is provided via wave or radiator type systems integrated into the casing design.

Windings

Windings are manufactured using computerized machines that maintain precise conductor tension to produce uniform and symmetrical coils.

  • Low Voltage (LV) Windings: Made from copper or aluminum strips to enhance resistance against electrodynamic stresses caused by short circuits. Insulated with pure cellulose paper.
  • High Voltage (HV) Windings: Made from enamelled wire or strips covered with pure cellulose paper insulation.

Technical Data for Oil Transformers

Three-Phase Oil Transformers kV 6/10 / 0.4 Dyn11 - ECE Series

This series includes transformers ranging from 50 kVA to 3150 kVA with primary voltages selectable as 6 or 10 kV. Key parameters include:

  • Power ratings from 50 kVA to 3150 kVA.
  • Core losses (Wfe) ranging from 0.160 W to 3.20 W at 75°C.
  • Load losses (Wcc) from 1.1 W to 32.0 W.
  • Voltage regulation (vcc) between 4% and 6%.
  • Exciting current (I0) from 0.8% to 2.8%.
  • Oil weight varies from 110 kg to 1350 kg.
  • Total weight ranges from 400 kg to 6320 kg.
  • Dimensions and noise levels (dB(A)) are provided for each model, with noise levels generally between 62 dB(A) and 87 dB(A).

Three-Phase Oil Transformers kV 15/20 / 0.4 Dyn11 - UE Series

This series covers transformers from 50 kVA to 3150 kVA with primary voltages selectable as 15 or 20 kV. Key technical data include:

  • Power ratings from 50 kVA to 3150 kVA.
  • Core losses (Wfe) from 0.090 W to 2.20 W at 75°C.
  • Load losses (Wcc) from 1.1 W to 27.5 W.
  • Voltage regulation (vcc) around 4% to 6%.
  • Exciting current (I0) between 0.2% and 0.4%.
  • Oil weight ranges from 145 kg to 1270 kg.
  • Total weight varies from 610 kg to 7400 kg.
  • Dimensions and noise levels are specified, with noise levels from 31 dB(A) to 80 dB(A).

Product Code Note

In the product codes, the placeholder "XX" must be replaced with the desired primary voltage value (6 or 10 for ECE series, 15 or 20 for UE series) to specify the transformer configuration.

Summary of Critical Information

  • Compliance with international standards (UNEL, C.E.I., I.E.C.) ensures quality and safety.
  • Core design and winding construction optimize efficiency and reduce noise.
  • Insulating oil is carefully processed to maintain dielectric strength and cooling.
  • Voltage regulation is facilitated by an externally operable change-over switch.
  • Detailed technical data including losses, weights, dimensions, and noise levels support selection for specific applications.
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Catalog excerpts

TECHNICAL CONSTRUCTIONAL CHARACTERISTIC-1

TRASFORMATORI IN OLIO • OIL TRANSFORMERS CARATTERISTICHE TECNICO COSTRUTTIVE TECHNICAL CONSTRUCTIONAL CHARACTERISTIC DATI TECNICI TECHNICAL DATA SIRMET elettrica TRASFORMATORI IN OLIO • OIL TRANSFORMERS COSTRUZIONI ELETTROMECCANICHE TRASFORMATORI TRIFASI IN OLIO kV 15.20 / 0.4 Dyn11 - Serie UE THREE-PHASE OIL TRANSFORMERS kV 15.20 / 0,4 Dyn11 – UE Series Codice* Codex* Interasse ruote Wheel base Altezza Height Lung. Lenght Larg. Width Potenza Power Peso olio Peso totale Oil weight Tot. weight Realizzato con lamierini al silicio a cristalli orientati a bassa cifra di perdita, con taglio a 45° e montaggio step-lap in modo da ridurre al minimo la rumorosità. Realizzati con l’impiego di macchine computerizzate in grado di assicurare una giusta trazione del conduttore ed ottenere bobine perfettamente omogenee e simmetriche. Avvolgimenti BT - costruiti in nastro (rame o alluminio) per garantire una migliore resistenza agli sforzi elettrodinamici dovuti a corto circuiti e con isolamento in carta di pura cellulosa. Avvolgimenti AT - costruiti in filo smaltato o piattina ricoperta da carta di pura cellulosa. Sono del tipo passante in porcellana, rispondenti alle norme UNEL, scelti in base alle correnti nominali ed alla classe di isolamento del trasformatore. Viene posto sotto il coperchio e manovrato esternamente per regolare la tensione d’uscita del trasformatore. Costituita da lamiera e profilati d’acciaio con sistemi di raffreddamento ad onde o radiatori. OLIO ISOLANTE Ha caratteristiche chimiche ed elettriche conformi alle norme C.E.I. e I.E.C. L’olio viene essiccato e degassato prima del riempimento del trasformatore. The core is manufactured with grain-oriented silicon sheet with low losses, with 45° cut and step-lap assembly in order to reduce noise. * Nel codice prodotto sostituire “XX” con la tensione primaria voluta (15 o 20) | * In the product code instead of “XX” put the desired primary voltage (15 or 20) TRASFORMATORI TRIFASI IN OLIO kV 6.10 / 0.4 Dyn11 - Serie ECE THREE-PHASE OIL TRANSFORMERS kV 6.10 / 0,4 Dyn11 – ECE Series Windings are realized with computerized machine able to guarantee the exact traction of the conductor and obtain uniform and symmetric coils. LV WINDINGS are manufactured in bands (copper or aluminium) to guarantee an improved resistance to electrodynamical stress in case of short- circuits and with pure cellulose paper isolation. HV WINDINGS are manufactured with enamelled wire or plate covered in true cellulose paper. These are the heavy porcelain type, manufactured in compliance with UNEL standards, and are chosen according to the rated currents and the insulation class of the transformer. VOLTAGE CHANGE-OVER SWITCH This switch is placed under the cover and maneuvered externally to adjust the output voltage of the transformer. The casing is manufactured in sheet steel and steel profiles with wave or radiator type cooling system. Shows chemical and electrical characteristics in compliance with C.E.I. and I.E.C. standards, dried and de-gassed before filling the transformer. Codice** Codex** Interasse ruote Wheel base Altezza Height Potenza Power Lung. Lenght Larg. Width Peso olio Peso totale Oil weight Tot. weight ECE 3150-XX/0.4-O 3150 3,20 32,0 6 0,8 1350 6320 2300 1500 2500 1070 200 87 ** Nel codice prodotto sostituire “XX” con la tensione primaria voluta (6 o 10) | ** In the product code instead of “XX” put the des

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