Principle of the ultra-low frequency insulation voltage test
The ultra-low frequency insulation withstand voltage test is in fact an alternative to the industrial frequency withstand voltage test. As we know, in the test of large generators, cables and other test products for industrial frequency withstand voltage test, because their insulation layer presents a large electrical capacity, so need a large capacity test transformer or resonant transformer. Such some huge equipment, not only bulky, costly, and very inconvenient to use. In order to solve this contradiction, the power sector has adopted a reduced test frequency, thus reducing the capacity of the test power supply. From the theoretical and practical proof of many years at home and abroad, with 0.1Hz ultra-low frequency withstand voltage test instead of frequency withstand voltage test, not only can have the same equivalence, and the volume of the equipment is greatly reduced, the weight is greatly reduced, theoretically the capacity of about one fifth of the frequency, and simple operation, compared with the frequency test superiority more. This is the reason why this method is commonly used in developed countries.
This product combines the advanced technology of modern digital frequency conversion and adopts microcomputer control, which makes boosting, bucking, measuring and protection completely automatic. Because it is fully electronic, it is small in size and light in weight. The large LCD display is clear and intuitive, and it can display the output waveform and print test reports.
This product has the following characteristics
1, rated voltage less than or equal to 50kV ultra-low frequency using a single structure (a booster); more than 50kV ultra-low frequency using a series structure (two boosters in series), so that the overall weight is greatly reduced, the carrying capacity is enhanced, and the two boosters can be used separately for low voltage level ultra-low frequency.
2,Current, voltage and waveform data are obtained directly from the high-voltage side sampling, so the data is accurate.
3,With over-voltage protection function, when the output exceeds the set voltage limit value, the instrument will stop and protect, the action time is less than 20ms.
4,With over-current protection function: designed for double protection of high and low voltage, the high voltage side can be stopped precisely according to the set value; the low voltage side will be stopped when the current exceeds the rated current, the action time is less than 20ms.
5,The high voltage output protection resistor is designed in the booster body, so there is no need to connect another protection resistor outside.
6,Because of the use of high and low voltage closed loop negative feedback control circuit, the output has no capacitive rise effect.
XHDP-50M 50kV VLF AC Cable Hipot Tester




Model no |
Rated Voltage |
Load Carrying
Capacity |
Power
FuseTube |
Product Structure |
XHDP-30 |
30kV
(Peak) |
0.1Hz,≤1.1µF |
8A |
Controller
Booster |
0.05Hz,≤2.2µF |
0.02Hz,≤5.5µF |
XHDP-50 |
50kV
(Peak) |
0.1Hz,≤1.1µF |
20A |
Controller
Booster |
0.05Hz,≤2.2µF |
0.02Hz,≤5.5µF |
XHDP-60
|
60kV
(Peak) |
0.1Hz,≤1.1µF |
20A |
Controller
Booster |
0.05Hz,≤2.2µF |
0.02Hz,≤5.5µF |
XHDP-80
|
80kV
(Peak) |
0.1Hz,≤1.1µF |
20A |
Controller
Booster |
0.05Hz,≤2.2µF |
0.02Hz,≤5.5µF
|
Welcome you contact us for 30kV/50kV/60kV/80kV/90kV customization.









1. Are you a trading company or a manufacturer?
We are a professional manufacturer with more than 10 years of experience. We can strictly control the quality of parts and finished products.
2. What is the delivery time and inventory?
If our best-selling products are in stock, it will be 5-8 working days for shipment. But for mass production and customized production, the time will take 2-4 weeks.
3. What are your payment terms?
Payment ≤ USD 2000, 100% T/T prepayment. Orders over USD 2000 can be negotiated.
4. How long is your product warranty?
We provide 1 year warranty for the equipment.
5. How do you ensure quality?
The product links include R&D, manufacturing, commissioning and technical support, following strict and scientific management principles. Therefore, we can support strong production and R&D capabilities, and can produce high-quality products at competitive prices to meet customers' high requirements.
6. What support can I get?
We will provide training support, marketing support, technical support and supply chain support. You can contact us for more information.
7. Where is your factory? Can I visit your factory?
We are located in Xi'an, Shaanxi, China. We are close to Xi'an Xianyang International Airport, which is about 2 and half hours by plane from Shanghai and Guangzhou. All customers from all over the world are welcome to visit us.
8. How to become your dealer?
Every company interested in power system instruments can contact us without hesitation, including website letters, emails, telephones, etc. We will contact you quickly according to your company information and cooperation intentions.