Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of AC Hipot Tester in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
How would you describe the AC VLF Hipot Tester?
The AC VLF Hipot Tester is a state-of-the-art portable high-voltage test system engineered specifically for the withstand testing (Hipot) of high-capacitance loads, primarily medium and high-voltage power cables (XLPE, EPR insulated) and large rotating machinery (generators, motors).
Unlike traditional power frequency (50/60Hz) test sets that are bulky and require massive power sources, the VLF tester operates at an ultra-low frequency (typically 0.1 Hz or lower). This drastic reduction in frequency significantly lowers the reactive power required to test capacitive loads, allowing for a compact, lightweight, and highly portable design.
This technology complies with international standards such as IEEE 400.2 and IEC 60502, providing a safe and effective method to assess insulation integrity without the damaging effects associated with DC testing (such as space charge accumulation). It is the preferred choice for utilities, contractors, and maintenance teams for acceptance testing and preventive maintenance of underground cable systems
What are the characteristics of AC VLF Hipot Tester?
VLF AC output, compatible with capacitive cable loads.
Easier to meet on-site power supply and load requirements in cable withstand voltage applications, suitable for long cables or test samples with large capacitance.
One-click testing process. Supports preset target voltage, test duration, and process control, reducing repetitive manual operations and lowering the probability of errors.
Real-time monitoring of multiple parameters. Key data (such as output voltage, test current/leakage current, timing status, etc.) can be observed simultaneously during the test, facilitating on-site stability assessment.
Comprehensive safety protection system. Features automatic disconnection and alarm prompts to reduce risks to personnel and equipment in case of test sample abnormalities.
Data storage and export (by configuration). Supports historical record saving; optional USB export/printing/PC export methods meet engineering archiving and acceptance report requirements.
Portable structure (by model). Suitable for carrying and placement in substations, cable trenches, tunnels, etc.; accompanying cables and accessories can be centrally stored for easy management.
What precautions should be taken before testing?
Before operation, power outage, voltage testing, and grounding must be completed, and electrical safety measures such as setting up barriers and warning signs must be implemented.
Suggested wiring sequence: Grounding terminal first → Signal/control terminal second → High-voltage terminal last (refer to the instruction manual).
Live plugging and unplugging is strictly prohibited: Do not disconnect any connecting wires or touch the high-voltage terminal before the equipment output returns to zero.
After the test, the discharge must be fully performed. Cables are typical energy storage test items, and residual voltage may persist.
If abnormal current rise, unstable waveform/output, unusual odor/noise, etc., occur, the test should be stopped immediately and the cause investigated.
When using in humid, condensation, or strong wind/sandstorm environments, enhanced insulation and on-site protection are required (outdoor testing should be suspended if necessary).
How should the equipment be stored after use?
Cable and Connector Inspection: Regularly inspect the insulation layer of high-voltage lines, the tightness of connectors, and the cleanliness of contact surfaces; replace immediately if any damage is found.
Storage Environment Requirements: For long-term storage, it is recommended to place the equipment in a dry, well-ventilated area, avoiding corrosive gases and high humidity environments.
Cleaning Standards: Clean the outer casing and insulation components with a dry cloth to avoid solvent corrosion; keep interfaces free of oil and moisture.
Functional Self-Test: It is recommended to perform periodic power-on self-tests according to the frequency of use to confirm that the display, protection, fan/power supply, etc., are functioning normally (depending on the structure).
Calibration/Metrology: When used for acceptance testing, third-party testing, or quality system requirements, it is recommended to perform periodic calibration and retain the certificate and serial number for traceability.
We value every client's inquiry and cooperation. Whether you need technical selection support, a quote, or after-sales service, you can contact us through the following methods：
📞 Pre-sales Hotline: [+8613603329412]
📧 Email: [dylan@dualcanopy.com]
💬 24-Hour Online Response
FAQ
Q1: Can this equipment test cables of different voltage levels?
A: Yes. By adjusting the output voltage amplitude, the same equipment can test cables of multiple voltage levels. For example, a 50kV VLF tester can test both 10kV cables (test voltage approximately 28kV) and 35kV cables (test voltage approximately 52kV peak value; equipment rating needs to be confirmed). However, it should be noted that the rated output current of the equipment determines its maximum load capacitance; capacitance calculations are necessary when testing long cables.
Q2: Is there any danger if there is a sudden power outage or equipment malfunction during testing?
A: Our equipment is designed with a comprehensive fail-safe mechanism. Once an input power interruption or internal fault is detected, the equipment will immediately cut off the high-voltage output and trigger an audible and visual alarm. Simultaneously, the high-voltage side is equipped with an automatic discharge device that automatically releases residual charge on the test sample after a fault occurs, ensuring the safety of personnel and equipment.
Q3:Why is "load capacity/capacity" a key consideration when testing cable withstand voltage?
A: The equivalent capacitance of a cable affects the output capacity of the equipment and the stability of the test. Therefore, it is recommended to provide the cable length, number of cores, and voltage rating when selecting a cable.
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