SCOTT-T TRANSFORMERS (LV)

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Product Description

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Omsan Scott-T dry-type transformers are designed to convert three-phase low-voltage systems to two-phase output with a 90° phase shift. The design ensures balanced current draw from the three-phase network, even under unbalanced or single-phase load conditions.

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These transformers are particularly suitable for applications where load imbalance, phase shift, and harmonic performance are critical.

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Standartlar

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• IEC 60076-11 – Dry-type transformers

• IEC 60076-1 – General

• IEC 60076-5 – Short-circuit withstand capability

• IEC 60076-10 – Sound levels

• ISO 9001 – Quality management system

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Electrical Characteristics

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• Parameter Value

• Rated Power Up to 250 kVA

• Primary Voltage 200 – 690 V

• Secondary Voltage Project-specific

• Frequency 50 / 60 Hz

• Phase Structure 3-phase → 2-phase (Scott-T)

• Phase Angle 90°

• Connection Structure Main + Teaser

• Short-circuit voltage 4% – 8%

• Insulation Class F / H

• Conductor Material Copper / Aluminum

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Thermal and Cooling

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• Parameter Value

• Cooling Method AN / AF

• Temperature Rise Compliant with IEC 60076-11

• Ambient Temperature -5°C to +40°C.

• Altitude ≤ 1000 m

• Thermal Monitoring Optional (PTC / PT100)

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Mechanical and Structural Characteristics

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• VPI (Vacuum Pressure Impregnation) insulation system

• Flame-retardant and self-extinguishing insulation materials

• High mechanical resistance to short-circuit forces

• Low-vibration core design

• Corrosion-resistant structural elements

• Compact design suitable for indoor installation

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Design Features

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• Balanced current draw from a three-phase network under a two-phase load

• Optimized leakage reactance for system compatibility

• Stable operation under unbalanced load conditions

• Reduction of harmonic effects through electromagnetic optimization

• Low losses and high efficiency

• Low acoustic noise level

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Routine Tests (IEC 60076)

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• Winding resistance measurement

• Voltage ratio and phase angle verification

• Short-circuit impedance and load losses

• No-load losses and current

• Applied voltage test

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Type Tests

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• Temperature rise test

• Partial discharge measurement

• Dielectric tests

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Special Tests (optional)

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• Phase angle verification (90°)

• Unbalanced load performance test

• Harmonic load analysis

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Application Areas

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• Industrial plants with unbalanced loads

• Arc furnace LV systems

• Power electronics and rectifier systems

• Test and laboratory applications

• Special machines requiring phase conversion

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Optional Features

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• PT100 / PTC temperature sensors

• Fan cooling (AF)

• Digital temperature monitoring unit

• Cabinet (IP20 / IP23)

• Busbar or cable outlet options

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Advantages

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• Balanced load drawn from a three-phase network

• High unbalanced load tolerance

• Dry type design → high operational safety

• Low maintenance requirements

• Compact and robust construction

• High operational reliability

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Notes

• All values ​​are customizable according to project requirements.

• Scott-T connection requires application-specific engineering verification.