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SIL16 radial stratification vertical winding machine for resin transformer windings

SIL16 radial stratification vertical winding machine for resin transformer windings

The high quality of the insulation used in modern conductors, both in enameled wire and polyester-coated wire, reaches dielectric strength values between windings of over 6300 volts. For this reason, and due to the high quality in layering that can be achieved with the machine, high-quality results have been obtained. By adopting this technique, over a period of ten years, Siltech has produced more than 32,500 windings, which have been sold to various Italian and foreign customers, with only 0.4% of the windings experiencing failures during operation. The failure is due to low dielectric voltage or a ground fault. No failures have been identified due to faults between dielectric windings.

Category: Winding machine for transformers

  • Supply voltage: 380 Volts
  • Total installed power capacity: 4 KW
  • Weight: 2100 Kg
  • Winding diameter: minimum 190 or 300 mm, maximum 720 mm
  • Coil height: 0÷1600 mm
  • Maximum conductor diameter: 6.50 mm
  • For transformers with a maximum power of 2500 KVA in the 24KV class



  • 1. DRASTIC REDUCTION IN WINDING TIMES

    With a conductor of wire or tape type, the usual technique is represented in figure 3, and an experienced operator can produce two or at most three windings in eight hours. With the MOD. SIL 16 winding machine, an experienced operator will achieve an average production of 10+12 windings in eight hours, also including preparation times for winding shapes with related spacers, such as nets or other elements.

  • 2. GREATER HEAT DISSIPATION

    A greater heat dissipation, with the same average AT of the windings, of about 10+12% is due to the absence of insulating materials between layers and the reduced thickness of the coils.

  • 3. LOW LEVEL OF PARTIAL DISCHARGES

    This is practically nonexistent. Coils produced with the radial winding technique are characterized by very low partial discharges. This is facilitated by an optimal voltage distribution and the low probability of air bubble formation compared to the layer winding technique. See Fig. 3 and Fig. 4.

  • 4. FILLING FACTOR

    The filling factor is higher than 70%, compared to the 50-56% obtainable with other winding techniques. All other conditions being equal, this leads to a drastic reduction in coil thickness.

  • 5. HIGH IMPULSE RESISTANCE

    The high resistance of the coils to voltage impulses with the radial stratification technique has been demonstrated in an in-depth study that examined the tendency of impulse voltages in high-voltage windings. The study conducted by Silmek in collaboration with some transformer manufacturers is summarized below (see figures 5-6).