AC Hipot Test Set

The AC hipot test set is a test device used to detect the insulation performance of high-voltage electrical equipment (such as cables, transformers, and switchgear). The tester is usually made of a sturdy insulating material shell, with a box-type structure, a handle for easy carrying, and a display screen and control buttons on the front panel for easy operation. Its working principle is to use an AC power supply to generate high voltage and apply it to the device under test through a test fixture. The circuit inside the device monitors the current passing through the device under test and whether the device can withstand the test voltage within the specified time without breakdown or excessive leakage current, thereby judging whether the device meets the insulation requirements.

High stability output voltage
The AC hipot test set can provide continuous and constant AC high voltage during the test. This feature is mainly due to the voltage stabilization module inside the tester, which monitors the output voltage in real time and uses feedback control to quickly adjust the current and voltage to ensure that the output voltage remains stable within the set range. The advantage of high stability output is that it can effectively simulate the working state of the device in an actual high-voltage environment, thereby truly and accurately evaluating the insulation performance of the device.

Precision current leakage measurement
The AC hipot test set is equipped with a high-precision current leakage measurement module, which can detect the tiny current changes of the device under test under DC high voltage. The measurement accuracy of the leakage current can usually reach the microampere level. The current leakage measurement module monitors the current changes of the device under test in real time through a highly sensitive current sensor, amplifies the tiny leakage current signal, and then accurately measures it by the signal processing circuit. In this way, when the device is subjected to high voltage, the tiny leakage current can be detected, and the insulation material can be accurately judged whether it is damaged or aging.

Portable design
The AC hipot test set adopts a portable design. The surface of the box is equipped with a handle for easy hand-carrying. It is small in size and light in weight, which is easy to carry. This design makes it easy to test the device at different sites, especially suitable for outdoor or decentralized power equipment testing scenarios.

Automatic discharge function
The AC hipot test set has an automatic discharge function. After the device is powered off, the discharge resistor can quickly consume the residual charge of the device under test, preventing the operator from being shocked by accidental touch after the test. At the same time, it reduces the discharge waiting time and improves the operation safety and work efficiency.

Power industry: high-voltage withstand voltage testing for power plants, substations, and grid companies.
Electrical manufacturing industry: Factory inspection of products such as transformers, switchgear, cables, and transformers.
Power engineering: on-site installation, commissioning, and preventive testing.
Research and testing institutions: Performance testing of high-voltage electrical equipment and insulation materials.
Petroleum, chemical, mining, and large industrial and mining enterprises: insulation testing and safety testing of high-voltage electrical equipment.

1. Project acceptance application

UHV AC hipot test sets are widely used in EPC projects and third-party testing work for:

Factory Acceptance Testing (FAT)

Site Acceptance Testing (SAT)

Commissioning before energization

Handover inspection for utility projects

Preventive and post-maintenance testing

They are commonly used for transformers, GIS, cables, switchgear, and other high-voltage equipment during project delivery stages.

2. IEC compliance

UHV AC hipot test sets are designed in line with internationally recognized high-voltage testing standards, including:

IEC 60060 (High-voltage test techniques)

IEC 60076 (Power transformers)

IEC 62271 (Switchgear and controlgear)

IEC 60270 (when partial discharge configuration is included)

IEEE C37 series practices

Utility and EPC commissioning standards (DL/T requirements in practice)

This ensures the system is suitable for global EPC and utility acceptance requirements.

3. Ease of operation

UHV AC hipot test sets are designed for field engineers and test teams working under project deadlines.

Key features include:

Simple menu-based operation interface

One-key automatic test mode

Automatic frequency tuning (for resonant systems)

Automatic voltage control and ramping

Clear real-time display of test parameters

Minimal wiring complexity

This reduces training time and improves on-site efficiency for EPC teams.

4. Measurement accuracy

UHV AC Hipot systems provide stable and reliable high-voltage measurement performance.

Accuracy is ensured through:

High-precision voltage and current sampling systems

Digital signal processing (DSP) technology

Stable resonant output control

Low waveform distortion (near sinusoidal output)

This allows EPC and testing engineers to obtain consistent insulation withstand test results even under field conditions.

5. Calibration and certification

UHV provides complete calibration and verification support for engineering and laboratory use.

We offer:

Factory calibration before shipment

Performance verification reports

Quality inspection certificates

Calibration-related documentation upon request

This supports compliance with EPC quality systems and third-party accreditation requirements.

6. Data traceability

UHV AC hipot test sets support full test data traceability, which is critical for EPC handover documentation and lab reporting.

Functions include:

Automatic test data recording

Historical data storage and retrieval

USB export of raw data

Equipment-based test record tracking

Project-level data archiving

This ensures every test can be traced back for audits, inspections, and project documentation.

7. Software analysis

UHV provides PC-based software for data analysis and reporting.

Software functions include:

Test data visualization

Voltage/current curve analysis

Automatic report generation (PDF format)

Data export and integration

Historical comparison of test results

This is especially useful for EPC documentation packages and third-party lab reporting systems.

8. Standards compliance

UHV AC hipot test sets are designed according to international and utility-grade standards, including:

IEC 60060

IEC 60076

IEC 62271

IEEE C37 series

Relevant EPC and utility commissioning specifications

This ensures compatibility with global project acceptance and inspection requirements.

9. Training support

UHV provides full technical training support for EPC contractors and testing laboratories.

Support includes:

Pre-delivery:

Technical consultation and system selection

On-site commissioning:

Installation guidance

Operational training for engineers

Test procedure explanation

After delivery:

Remote technical support

Software usage guidance

Maintenance and troubleshooting assistance

Training can be tailored for project teams, subcontractors, or laboratory staff.

10. Delivery time

UHV maintains stable manufacturing capacity to support EPC project schedules.

Standard models:

Short delivery time from production or stock availability

Customized systems:

Delivery time depends on technical configuration and project requirements

EPC project orders:

Priority production scheduling available

Project-based delivery coordination

Logistics support for international shipments

We work closely with EPC contractors and testing companies to meet commissioning deadlines.

Summary

IEC-compliant high-voltage testing systems

Suitable for FAT, SAT, and commissioning projects

High measurement accuracy and stability

Simple field operation with automation features

Full data traceability and reporting functions

Strong software and analysis capability

Professional calibration and documentation support

Global EPC and utility project experience

Reliable delivery and technical support system

UHV AC hipot test sets provide EPC teams and third-party laboratories with a practical, standardized, and efficient solution for high-voltage testing, ensuring safe energization, accurate acceptance results, and complete project documentation.

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