30 kVA High Efficiency Three Phase Dry Type Autotransformer for Industrial Voltage Adaptation

This 30 kVA three phase isolated dry type autotransformer is designed specifically to adapt voltage levels within industrial and factory environments. It converts common three phase voltages, such as 480 V to 400 V or 600 V to 380 V, enabling imported machinery, production lines, and auxiliary equipment to operate safely on local power grids.

The autotransformer winding configuration delivers superior efficiency compared to conventional isolation transformers while substantially reducing physical size and weight. An integrated electrostatic shield between the windings provides a level of isolation that attenuates common mode noise and line disturbances, making it suitable for sensitive control systems. Fully dry type construction with Class H insulation eliminates fire hazards, oil leaks, and the need for routine fluid maintenance, ensuring clean, long lasting operation in busy production areas.

• High operating efficiency up to 98 percent reduces energy waste and internal heat, cutting lifetime electricity costs for continuous factory duty.
• Integrated electrostatic shield provides isolation from high frequency line noise and switching transients, delivering cleaner power to connected equipment.
• Fully dry type insulation system with Class H materials eliminates flammable liquids, prevents leakage, and requires no oil sampling or disposal procedures.
• Compact and lightweight autotransformer core uses less copper and steel than an equivalent isolation unit, freeing valuable floor space in crowded electrical rooms.
• Flexible primary voltage tappings with multiple adjustment points compensate for utility voltage variations, maintaining stable secondary output without on site rewinding.
• Low acoustic noise design with high grade grain oriented silicon steel keeps sound levels comfortable for personnel working nearby.

Factories often operate machinery rated for different voltages, such as European 400 V motors on a North American 480 V supply. We configure the primary and secondary windings to your exact voltage pair and incorporate ±5 percent tapping links. This allows fine tuning at commissioning without needing an additional transformer.

Production areas frequently have cramped electrical closets. The autotransformer architecture reduces the magnetic core cross section and winding weight by up to 50 percent compared to a dual winding isolation transformer. Our compact enclosure dimensions are kept as small as possible, and front access terminals allow installation flush against a wall.

Factories processing textiles, wood, or cement generate airborne dust that can degrade insulation. We impregnate the windings with high bond strength polyester varnish and offer IP23 or IP54 enclosures that block falling dust and splashing water. The fully dry design contains no oil, eliminating any risk of leaks onto the factory floor.

When the transformer must sit near workstations, low noise is essential. We use low loss, cold rolled grain oriented silicon steel cut in step lap patterns to minimize magnetostriction. Combined with rigid core clamping and anti vibration mounting pads, the sound level is kept below 45 dB(A), which is quieter than typical factory background noise.

PLCs, CNC machines, and measurement instruments can malfunction due to common mode interference. The built in electrostatic shield intercepts high frequency disturbances and channels them to ground. This creates a cleaner power source without resorting to a larger, costlier fully isolated transformer.

Many factory processes run 24 hours with minimal downtime. We over spec the winding conductor cross section, use Class H insulation with a 30 °C ambient margin, and apply a three stage powder coating to the steel enclosure. These measures extend thermal and mechanical life, ensuring the transformer stays in service during demanding production schedules.

This unit is an autotransformer, meaning it shares part of the winding between primary and secondary, which yields higher efficiency, smaller size, and lower weight. The "isolated" designation comes from an internal electrostatic shield that filters common mode noise, giving a cleaner output than a standard autotransformer. However, it does not provide galvanic isolation between input and output. If your application requires complete electrical separation for safety, we also supply full isolation transformers.

Yes, this is one of the most requested configurations. We set the primary for 480 V with tapping steps and the secondary for 400 V. The transformer is factory pre set to your voltage, but the taps allow simple adjustments if your incoming line voltage varies.

It is. Dry type construction means no liquid dielectric is used, so there is zero risk of oil leakage. The standard enclosure is ventilated and meets IP20, but we can upgrade it to IP23 or IP54 to protect against dust and water spray. The windings are sealed with moisture resistant varnish, which prevents tracking and mold growth.

Very little. We recommend a visual inspection once or twice a year to check for dust buildup on ventilation grilles, verify that electrical connections remain tight, and ensure the area around the unit is clear. There are no liquids to sample, no filters to change, and no moving parts. If thermal protection switches are installed, test their continuity during scheduled shutdowns.

The sound pressure level is typically 42 to 45 dB(A) at one meter, comparable to a quiet office. You can position it in or near production spaces without needing acoustic enclosures. Our anti vibration mounting pads reduce structure borne noise transmission through the floor.

We specialize in custom voltage designs. You provide the exact primary and secondary voltage, frequency, and any space or certification requirements, and we produce a dedicated winding specification. There is no extra charge for non standard voltages as long as they fall within the standard insulation range.