High-Voltage Test Transformer

Product Specifications

Technical details and manufacturing context for High-Voltage Test Transformer

Definition

A high-voltage test transformer is a test-voltage source used primarily for power-frequency AC dielectric testing. A complete system can include an adjustable low-voltage supply, the step-up transformer, current limiting, protective switching and interlocks, a discharge/earthing arrangement, and a separate approved measuring system. DC output requires a rectifier or voltage-multiplier stage; a transformer alone does not generate DC. Output voltage, available current or kVA, waveform, duty cycle, permissible load capacitance, partial-discharge background, insulation system, cooling and enclosure vary materially by model and test purpose. The catalog values shown here are comparison prompts rather than a guaranteed range for every high-voltage test transformer. Specify the test object, applicable product-test procedure, voltage type and waveform, level, duration, duty cycle, load capacitance, measurement uncertainty, safety arrangement, installation conditions and required evidence before selecting equipment.

Working Principle

An adjustable low-voltage AC source excites the primary winding and electromagnetic induction produces a higher AC voltage at the secondary. The available output current and waveform depend on transformer impedance, source stiffness, frequency, duty cycle and the test object, which is often substantially capacitive. A DC test system adds a rectifier or multiplier and appropriate smoothing, measurement and discharge components. Test voltage is established by the approved measuring system rather than inferred solely from the primary-to-secondary turns ratio.

Common Materials

Electrical steel (silicon steel) laminations, Enameled copper wire, Insulating materials (paper, pressboard, epoxy resin), Transformer oil or insulating gas (SF6), Steel or aluminum tank/enclosure

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	5–100 kVA	Select based on test object capacitance and required voltage.
Output Voltage	50–300 kV	AC or DC depending on model.
Input Voltage	220/380 V	Single or three phase.
Frequency	50/60 Hz	Mains frequency.
Output Voltage Regulation	≤3 %	From no load to full load.
Harmonic Distortion	≤5 %	Under rated load.
Insulation Class	H	Class H (180°C) for long life.IEC 60085
Cooling Method	ONAN	Oil natural air natural.
Protection Degree	IP20–IP54	Higher IP for outdoor use.IEC 60529
Ambient Temperature	-10–40 °C	For indoor installation.
Relative Humidity	≤90 %	Non-condensing at 20°C.
Weight	200–5000 kg	Depends on power and voltage rating.
Dimensions (L×W×H)	800×600×1200–3000×2000×3500 mm	Approximate, varies with rating.

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 a low-reluctance path for the magnetic flux generated by the windings, typically made from laminated electrical steel to reduce eddy current losses.

Material: Electrical steel laminations
Primary Winding Part
The input winding connected to the lower-voltage supply; the current in this winding creates the magnetic field.

Material: Enameled copper wire
Secondary Winding Part
The output winding with more turns than the primary; it induces the high-voltage output required for testing.

Material: Enameled copper wire with enhanced insulation
Insulation System
Isolates the windings from each other, the core, and the enclosure to prevent electrical breakdown at high voltages.

Material: Combination of insulating paper, pressboard, epoxy resin, and impregnating oil/gas
Tap Changer (if applicable) Optional
Allows adjustment of the output voltage ratio by changing the number of active turns in the winding.

Material: Copper contacts, insulating materials

Applied To / Applications

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

Final Test Chamber

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Manufacturers of High-Voltage Test Transformer

Manufacturer profiles associated with High-Voltage Test Transformer.

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Frequently Asked Questions

What output voltage and power should be specified?

Specify AC, DC or impulse waveform; test level and duration; test-object capacitance; required current or kVA; duty cycle; frequency; regulation and waveform limits. The listed 50–300 kV and 5–100 kVA ranges are directory prompts, not a family-wide guarantee.

Can a test transformer generate DC by itself?

No. A transformer produces AC. DC testing requires a compatible rectifier or voltage-multiplier stage plus suitable measurement, smoothing, protection and discharge equipment.

Which IEC standards are relevant?

IEC 60060-1:2025 covers high-voltage dielectric test techniques and IEC 60060-2:2025 covers measuring systems. IEC 60270:2025 applies when charge-based partial-discharge measurement is required. IEC 60076-11 explicitly excludes testing transformers, so it is not generic evidence for this product family.

Are ONAN cooling, Class H insulation and an IP rating universal?

No. Test sets may be liquid-insulated, cast-resin or use another construction. Confirm the model-specific insulation system, thermal designation, cooling, enclosure boundary and IP test evidence; exposed high-voltage parts and a control enclosure can have different protection conditions.

Data Basis

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

Preliminary Technical Classification

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safety:	Define clearances, barriers, interlocks, emergency stop, current limiting, automatic grounding/discharge, access control and local legal requirements.
source:	Size voltage, current/kVA, frequency, short-time or continuous duty, source regulation and waveform performance against the actual test object.
waveform:	Specify power-frequency AC, DC with rectifier/multiplier, lightning impulse, switching impulse or another required waveform; do not treat these as interchangeable.
measurement:	Define approved measuring-system range, uncertainty, calibration, divider/coupling device and PD background requirement where applicable.
test object:	Identify equipment type, applicable product standard, insulation level, terminal arrangement, capacitance and whether the test is laboratory, factory or on-site.

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards