High Voltage Transformer for Dielectric Strength Testing

Product Specifications

Technical details and manufacturing context for High Voltage Transformer

Definition

This high voltage transformer is a component used within an industrial dielectric strength tester. It converts standard mains input voltage, typically 110V or 220V AC, to high voltage outputs in the range of 1kV to 100kV, as required for testing the insulation properties and dielectric strength of electrical components, cables, and insulating materials. The transformer operates on the principle of electromagnetic induction, using primary and secondary windings with different turn ratios to step up voltage. When AC voltage is applied to the primary winding, it creates a changing magnetic field that induces a higher voltage in the secondary winding, proportional to the turns ratio. This enables the generation of high test voltages while maintaining electrical isolation between input and output circuits. The transformer is constructed with silicon steel laminations for the core, enameled copper wire for the windings, and is insulated with either insulating oil or epoxy resin. Porcelain or composite bushings provide the necessary insulation and connection points. Key parameters include rated power from 5 to 100 kVA, input voltage from 220 to 480 V AC, output voltage from 10 to 100 kV, output frequency from 50 to 60 Hz, voltage regulation of ≤5%, insulation class H (180°C) per IEC 60085, dielectric withstand voltage of 1.5×U+2 kV per IEC 60076-3, operating temperature from -20 to 50°C, relative humidity ≤90%, protection rating from IP20 to IP54 per IEC 60529, cooling method ONAN per IEC 60076-2, and weight from 150 to 3000 kg. These values are reference ranges and must be confirmed for the specific model and application. The transformer is designed for use in dielectric strength testing equipment and is not a standalone product. It is essential to verify all specifications with the legal manufacturer or supplier before procurement or use.

Working Principle

The transformer operates on electromagnetic induction. When AC voltage is applied to the primary winding, it creates a changing magnetic field in the silicon steel core. This field induces a voltage in the secondary winding, which has more turns than the primary, resulting in a step-up of voltage. The turns ratio determines the output voltage. The transformer is designed to provide high voltage for dielectric testing while maintaining electrical isolation between input and output circuits. The core is made of silicon steel laminations to reduce eddy currents, and the windings are made of enameled copper wire. Insulating oil or epoxy resin provides insulation and cooling. The output voltage is controlled by the turns ratio and is proportional to the input voltage.

Common Materials

Silicon steel laminations, Enameled copper wire, Insulating oil or epoxy resin, Porcelain or composite bushings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	5–100 kVA	Determines maximum test voltage and current capability.
Input Voltage	220–480 V AC	Standard mains supply; other voltages on request.
Output Voltage	10–100 kV	Maximum RMS voltage for dielectric testing.
Output Frequency	50–60 Hz	Mains frequency; higher frequencies available for special tests.
Voltage Regulation	≤5 %	From no-load to full load; lower is better for stable output.
Insulation Class	H	Class H (180°C) for long life under high temperature.IEC 60085
Dielectric Withstand Voltage	1.5×U+2 kV	Primary to secondary and ground; U is rated output voltage.IEC 60076-3
Operating Temperature	-20–50 °C	Ambient temperature range for continuous operation.
Relative Humidity	≤90 %	Non-condensing; higher humidity may cause flashover.
Protection Rating	IP20–IP54	IP20 for indoor, IP54 for outdoor or dusty environments.IEC 60529
Cooling Method	ONAN	Oil natural air natural; other methods on request.IEC 60076-2
Weight	150–3000 kg	Depends on power rating and voltage class.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Core Part
Provides magnetic path for flux, made of laminated silicon steel to reduce eddy current losses

Material: Silicon steel laminations
Primary Winding Part
Receives input voltage and creates magnetic field

Material: Enameled copper wire
Secondary Winding Part
Produces high output voltage through electromagnetic induction

Material: Enameled copper wire with enhanced insulation
Insulation System Part
Provides electrical isolation between windings and to ground

Material: Insulating paper, epoxy resin, or oil
Bushings Part
Provide insulated terminals for high voltage connections

Material: Porcelain or composite polymer

Applied To / Applications

This component is essential for the following industrial systems and equipment:

High Voltage Power Supply

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Manufacturers of High Voltage Transformer

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Frequently Asked Questions

What is the typical output voltage range of this transformer?

The output voltage range is typically 10 to 100 kV RMS, as listed in the reference parameters. However, the exact range depends on the specific model and configuration. Always confirm with the manufacturer or supplier for the actual model.

What insulation class does the transformer use?

The transformer is rated for insulation class H, which corresponds to a maximum operating temperature of 180°C, according to IEC 60085. This is suitable for long life under high temperature conditions. Verify the actual insulation class for the specific unit.

Can the transformer be used outdoors?

The protection rating ranges from IP20 for indoor use to IP54 for outdoor or dusty environments, per IEC 60529. If outdoor use is intended, ensure the unit has the appropriate IP rating. Confirm with the manufacturer for the specific model.

What cooling method is used?

The standard cooling method is ONAN (Oil Natural Air Natural), as per IEC 60076-2. This means the transformer uses natural convection of oil and air for cooling. Other cooling methods may be available on request, but must be confirmed with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric (0.8-1.1 bar) for air-cooled units, 1-3 bar for oil-filled cooling systems
other spec:	Relative humidity: 0-95% non-condensing, Altitude: ≤1000m above sea level, Dielectric withstand: 50-60 Hz frequency range
temperature:	-20°C to +40°C (operating ambient), -40°C to +70°C (storage)

High Voltage Transformer

Product Specifications

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