High Voltage Hipot Tester for Industrial Electrical Equipment and Transformer Insulation Quality Verification

 

A high voltage tester (hipot tester) applies a controlled over-voltage across electrical insulation barriers to verify dielectric strength and detect insulation defects, micro-voids, or inadequate creepage distances before equipment deployment. Designed for production floor testing and electrical laboratory environments, these units deliver stable AC and DC test voltages up to 100 kV with real-time leakage current monitoring. Procurement teams and quality managers select these instruments to ensure compliance with international electrical safety standards, prevent field insulation failure, and verify manufacturing consistency for transformers, switchgear, and industrial motors.

 
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Testing Capabilities & Product Types
 
01/

AC High Voltage Testers: Delivers sinusoidal AC test voltages up to 50 kV AC for evaluating dielectric strength under alternating electrical stress, identifying insulation breakdown and excessive leakage current.

02/

DC High Voltage Testers: Provides filtered DC output up to 100 kV for testing capacitive loads, power cables, and high-voltage DC transmission components without excessive charging current interference.

03/

AC/DC Combined Hipot Systems: Dual-mode testing platforms equipped with software-selectable AC and DC outputs to accommodate diverse product safety standards within a single test station.

04/

Automated Multi-Channel Testing Cabinets: Integrated multi-point scanning systems configured for concurrent or sequential testing of multi-winding transformers and complex electrical harness assemblies.

 

Technical Specifications

 

Output Voltage RangeCurrent Measurement RangeVoltage RegulationTrip Current ResolutionInterfaces & Communication
0 to 50 kV AC0 to 20 mA<= +/-1% of full scale0.1 mARS485, PLC I/O, USB
0 to 100 kV DC0 to 10 mA<= +/-1% of full scale0.01 mAModbus RTU, Ethernet, PLC
0 to 50 kV AC / 0 to 60 kV DCAC: 0 to 50mA / DC: 0 to 20mA<= +/-0.5% of full scale0.01 mA / 0.1 mARS232, PLC 24V I/O, USB
0 to 80 kV AC (Multi-channel)0 to 100 mA<= +/-0.5% of full scale0.01 mAProfinet, Ethernet/IP, PLC

 

ParameterSpecification
Input PowerAC 220V/380V +/-10%, 50/60 Hz
Power ConfigurationSingle-phase or three-phase, depending on model configuration
Duty CycleContinuous operation for automated production lines
Ramp TimeProgrammable from 0.1 to 99.9 seconds
Discharge CircuitAutomatic active internal discharge network upon test completion or interlock trip

 

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Key Features

Zero-Crossing Voltage Initiation: Circuitry switches output voltage exclusively at AC waveform zero-crossing points to eliminate transient voltage spikes and protect sensitive test articles from impulse stress.

Real-Time Arc Detection: High-speed current sampling circuits detect micro-arcs and sudden insulation flashover events within 2 milliseconds, immediately cutting output power.

Hardware Interlock Protection: External safety interlock terminals connect directly to enclosure safety cages or test fixture door switches to prevent high-voltage generation when access panels are open.

Isolated Measurement Circuitry: Low-voltage control circuits are optically isolated from high-voltage generation stages to protect operator interface terminals and external data loggers.
Data Storage & Traceability: Internal memory logs up to 10,000 test results with timestamp, applied voltage, leakage current, and pass/fail status for quality audit trails.

 

Test Applications
 

Power Transformers

Verifies turn-to-turn and winding-to-core insulation integrity on distribution and power transformers prior to oil filling and tank sealing.

Switchgear & Distribution Cabinets

Evaluates busbar clearance, creepage distances, and solid insulation barriers in medium-voltage switchgear assemblies.

Electric Vehicle Powertrains

Tests stator windings, high-voltage wiring harnesses, and battery pack isolation barriers against high-potential breakdown.

Industrial Motors & Generators

Assesses stator and rotor insulation health following rewinding or high-volume assembly line production.

 

How to Choose the Right Tester

 

Determine Test Voltage Requirements

Calculate the required test voltage based on the operating voltage of the device under test (DUT). Standard industrial practice typically requires test voltages equal to twice the working voltage plus 1,000 volts, or as specified by applicable IEC/UL standards.

01

Select AC vs. DC Output

Choose AC testing for standard production line verification where capacitive charging current is manageable. Select DC testing for high-capacitance loads including long cables and large generators to avoid thermal overload from high capacitive charging currents.

02

Evaluate Current Resolution & Trip Limits

Ensure the tester maximum current output and trip sensitivity match the leakage current profile of your product without triggering false failures from normal capacitive leakage.

03

Integration Level

Select standalone benchtop units for manual station testing or PLC-compatible units with industrial bus communication such as Profinet and Modbus for automated conveyor integration.

04

 

Manufacturing & Quality Control

 

1

Transformer Winding In-House

High-frequency and power transformers utilized within our test units are wound on automated CNC winding machines with tension-controlled copper wire to ensure magnetic coupling stability.

2

PCB Assembly

Surface-mount circuit boards undergo automated optical inspection and in-circuit testing prior to conformal coating for moisture and dust resistance.

3

Dielectric Breakdown Staging

High-voltage output transformers and multiplier circuits are vacuum-impregnated with high-grade epoxy resin to eliminate internal corona discharge and partial discharge vulnerabilities.

4

Calibration Verification

Every finished instrument is calibrated using NIST-traceable high-voltage dividers and digital electrometers, with individual calibration certificates generated prior to dispatch.

 

 

Customization & OEM

Custom Enclosure Integration: 19-inch rack-mount configurations or custom floor-standing console integration tailored to existing automated test bench layouts.

 

Software Protocol Adaptation: Proprietary communication protocols and custom GUI software development for seamless integration into factory Manufacturing Execution Systems.

 

Specialized Test Fixtures: Design and fabrication of custom high-voltage test probes, safety enclosures, and pneumatic clamping test fixtures for specific component geometries.

 

OEM Branding: Private labeling, custom front-panel layouts, and documentation localization for instrument distributors and equipment manufacturers.

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Documentation & Certifications

Compliance Standards

Manufactured in accordance with IEC 61010-1 for safety requirements of electrical equipment for measurement, control, and laboratory use, alongside IEC 60364 standards.

Certifications

CE marked, RoHS compliant, and available with ISO/IEC 17025 accredited calibration certificates upon request.

Shipped Documentation

Each unit includes a printed English user manual, wiring schematics, calibration certificate, maintenance guide, and digital software toolkit on USB drive.

 

Certifications

 

 

 

FAQ

 

Q: What is the difference between AC and DC high voltage testing?

A: AC testing stresses the insulation in both polarity directions, closely simulating real-world operational stress, and detects both resistive and capacitive leakage currents. DC testing applies unidirectional voltage, eliminating capacitive current interference, which makes it suitable for high-capacitance items like long power cables, though it requires controlled discharge procedures after testing.

Q: How does the tester protect the operator from electric shock?

A: The equipment incorporates a multi-layer safety architecture, including a hardware safety interlock loop connected to external test enclosures, automatic active discharge circuitry that drains stored capacitive energy within seconds of test completion, and zero-start voltage interlocks that prevent test initiation unless the voltage regulator is at zero.

Q: What causes a false fail during high-voltage testing?

A: False failures typically occur when capacitive leakage current from long cables, large transformers, or damp test environments exceeds the set trip threshold. Adjusting the trip current limit or switching from AC to DC testing for high-capacitance loads resolves this condition.

Q: Can these testers be integrated into fully automated PLC production lines?

A: Yes. All standard models feature isolated 24V DC digital I/O ports and industrial communication interfaces including Modbus RTU, RS485, and Ethernet enabling PLC start, stop, pass, and fail signal handshake integration with automated conveyor test stations.

Q: How often should the high voltage tester be recalibrated?

A: We recommend annual recalibration using NIST-traceable high-voltage measurement standards to maintain measurement accuracy and satisfy ISO 9001 quality management system audit requirements.

Q: What is the standard lead time for standard versus customized units?

A: Standard catalog models ship within 7 to 10 business days. Custom voltage configurations, specialized multi-channel enclosures, or tailored MES software integrations typically require 3 to 5 weeks depending on engineering requirements.

Q: What warranty terms and technical support are provided?

A: All units include a 2-year standard manufacturer warranty covering parts and workmanship, supported by remote engineering diagnostics, firmware updates, and replacement part availability.

As one of the most experienced high voltage tester manufacturers in China, we offer a wide range of products with superior quality. Please feel free to wholesale bulk durable high voltage tester from our factory. For price consultation, contact us.

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