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SIL 48 vertical winding machine with radial stratification, for round or oval resin transformers

SIL 48 vertical winding machine with radial stratification, for round or oval resin transformers

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

Category: Winding machine for transformers
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  • Technical Characteristics (SIL 48S):
    • Power-supply voltage: 380 Volt
    • Overall installed power capacity: 4 KW
    • Weight: 2100 Kg
    • Round winding: minimum 205 mm, maximum 550 mm
    • Coil height: 0÷1300 mm
    • Maximum conductor diameter: 5.00 mm
    • Oval Winding: max 730×980 mm, min 250×280 mm


  • Technical Characteristics (SIL 48M):
    • Power-supply voltage: 380 Volt
    • Overall installed power capacity: 4 KW
    • Weight: 2200 Kg
    • Round winding: max 730 mm, min 250 mm
    • Oval Winding: max 730×980 mm, min 250×280 mm
    • Coil height: 0÷1600 mm
    • Maximum conductor diameter: 6.00 mm


  • 1. DRAMATIC REDUCTION OF WINDING TIMES

    With a wire or ribbon-type conductor, the usual technique is that represented in figure 3, and a skilled operator can produce two or at most three windings in eight hours. With the MOD. SIL 48 winding machine, an experienced operator will achieve an average production of 10÷12 windings in eight hours, including preparation times for winding forms with relative spacers, such as nets or other elements.

  • 2. GREATER THERMAL DISSIPATION

    Greater thermal dissipation, with the same average AT of the windings, of about 10+12%, is due to the absence of interlayer insulation materials and the reduced thickness of the coils.

  • 3. LOW LEVEL OF PARTIAL DISCHARGE

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

  • 4. STACKING COEFFICIENT

    The stacking coefficient is over 70%, compared to 50-56% achievable with other winding techniques. Under equal conditions, this leads to a definite reduction in coil thickness.

  • 5. HIGH RESISTANCE TO IMPULSE VOLTAGES

    The high resistance of coils to impulse voltages with the radial stratification technique has been demonstrated in an in-depth study that has verified the trend of impulse voltages in high voltage windings. The study conducted by Silmek in collaboration with some transformer manufacturers is summarized below.