Very Low Frequency AC Hipot Tester is widely used in the AC withstand voltage test of cable, large high-voltage rotating motors. It combines the advanced technology of modern digital frequency conversion, adopting computer control, boost, buck, measurement and protection is fully automated. Since all with electronic, it has the features of small size, light weight, large-screen LCD display, clear and intuitive, can display the output waveform and print the test report. The design indicator of this instrument is in full compliance with the power industry standard of "General Technical Requirements For Ultra-low Frequency Hipot Tester”, easy to use.
Overview
Functions and characteristics
● Current voltage waveform sampling data were obtained directly from the high-voltage side so the data is accurate.
● With over-voltage protection function. When the output voltage exceeds the set voltage limiting value the instrument will shut down to protect the action time is less than 20ms.
● With over-current protection: it is designed with high and low voltage dual protection. The high-voltage side will be precise shutdown protection according to the set voltage value; when the current at low-voltage side is more than the rated current it will be shutdown protection and the action time is less than 20ms.
● The high-voltage output protective resistors are built into the booster so it does not need another protective resistor outside.
● As the adoption of high and low pressure closed-loop negative feedback control circuit so the output has no capacitive rise effect.
● With over-voltage protection function. When the output voltage exceeds the set voltage limiting value the instrument will shut down to protect the action time is less than 20ms.
● With over-current protection: it is designed with high and low voltage dual protection. The high-voltage side will be precise shutdown protection according to the set voltage value; when the current at low-voltage side is more than the rated current it will be shutdown protection and the action time is less than 20ms.
● The high-voltage output protective resistors are built into the booster so it does not need another protective resistor outside.
● As the adoption of high and low pressure closed-loop negative feedback control circuit so the output has no capacitive rise effect.
Models
| Model | Rated Voltage | Load Capacity | Weight & Dimension | Application |
| VLF-30kV |
30kV (Peak value) |
0.1Hz ≤1.1μF |
Controller: 6㎏ Size: 360(L)×250(W)×230(H)mm |
10kV cable electric generator etc. |
| 0.05Hz ≤2.2μF | ||||
| 0.02Hz ≤5.5μF |
Booster: 30㎏ Size: 323(L)×174(W)×323(H)mm |
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| 0.01Hz ≤11.0µF | ||||
| VLF-40kV |
40kV (Peak value) |
0.1Hz ≤1.1μF |
Controller: 6㎏ Size: 360(L)×250(W)×230(H)mm |
13.8kV cable electric generator etc. |
| 0.05Hz ≤2.2μF | ||||
| 0.02Hz ≤5.5μF |
Booster: 30㎏ Size: 357(L)×208(W)×343(H)mm |
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| 0.01Hz ≤11.0µF | ||||
| VLF-50kV |
50kV (Peak value) |
0.1Hz ≤1.1μF |
Controller: 6㎏ Size: 360(L)×250(W)×230(H)mm |
15.75kV cable electric generator etc. |
| 0.05Hz ≤2.2μF | ||||
| 0.02Hz ≤5.5μF |
Booster: 45㎏ Size: 357(L)×210(W)×365(H)mm |
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| 0.01Hz ≤11.0µF | ||||
| VLF-60kV |
60kV (Peak value) |
0.1Hz ≤1.1μF |
Controller: 6㎏ Size: 360(L)×250(W)×230(H)mm |
18kV cable electric generator etc. |
| 0.05Hz ≤2.2μF | ||||
| 0.02Hz ≤5.5μF |
Booster: 50㎏ Size: 357(L) ×220(W) ×370(H)mm |
|||
| 0.01Hz ≤11.0µF | ||||
|
VLF-80 kV |
80kV (Peak value) |
0.1Hz ≤0.5μF |
Controller: 8㎏ Size: 360(L)×250(W)×230(H)mm |
35kV cable electric generator etc. |
| 0.05Hz ≤1.0μF | ||||
| 0.02Hz ≤2.5μF |
Booster: 55㎏ Size: 357(L)×240(W)×390(H)mm |
|||
| 0.01Hz ≤11.0µF | ||||
| VLF-90 kV |
90kV (Peak value) |
0.1Hz ≤0.5μF |
Controller: 9㎏ Size: 360(L)×250(W)×230(H)mm |
35kV cable electric generator etc. |
| 0.05Hz ≤1.0μF | ||||
| 0.02Hz ≤2.5μF |
Booster: 60㎏ Size: 357(L)×240(W)×390(H)mm |
|||
| 0.01Hz ≤11.0µF |
The other technical parameters:
(1) Output frequency: 0.1Hz 0.05Hz 0.02Hz 0.01Hz
(3) Loading capability: the above table for reference
0.1 Hz maximum 1.1µF (Theoretical value the field cable length is 3-8 kilometers)
0.05 Hz maximum 2.2µF (Theoretical value the field cable length is 3-8 kilometers)
0.02 Hz maximum 5.5µF (Theoretical value the field cable length is 3-8 kilometers)
0.01 Hz maximum 11.0µF (Theoretical value the field cable length is 3-8 kilometers)
(4) Accuracy: ± (3% of full scale +0.5 KV)
(5) Voltage waveform distortion: ≤5%
(6) Operating conditions:
Temperature: -10 ℃ ~ +40 ℃;
Humidity: ≤ 85% RH
(7) Power Supply: AC 220V±10% 50Hz.
Remarks: Other power voltage and frequency can be customized.
