0.1Hz Vlf AC DC High Voltage Hipot Tester for Power Cable
Introduction:
A 0.1Hz VLF AC DC High Voltage Hipot Tester is a device that is used for testing power cables, transformers, switchgear, rotating machinery, and other electrical apparatus.The "VLF series" supply AC and DC Withstand voltage testing. It is an AC output tester with an output frequency of 0.1 Hz or lower rather than 50/60 Hz, which is the frequency of a typical AC power supply.At 0.1 Hz output, it takes 600 times less current and power to apply an AC voltage to a capacitive load.
Here are some of the features of a typical 0.1Hz VLF AC DC High Voltage Hipot Tester:
- Adapts microprocessor controlled, can realize voltage set-up/down, measuring and protecting automatically. Manual intervention is allowable even during the auto voltage boosting.
- Large LCD can display waveform clearly, and test report can be printed. Built-in printer.
- The data of current, voltage, and waveform can be sampled at HV side. A high voltage output protective resistor is provided in the voltage boost body in the design, and this eliminates the need for additional protective resistor connected outside.
- Closed-loop negative feedback circuit is adopted. No capacity rising during outputting.
- Over voltage and current protection: When the output is beyond the limitation, the control unit will shut itself down within 20ms.
When using a 0.1Hz VLF AC DC High Voltage Hipot Tester, it is important to note the following:
- The capacitance of the sample should not exceed the rated capacity of the instrument. The overload capacitance of the sample will affect the output waveform. If the capacitance is less than 0.05µF, the instrument cannot output normally .
- When using it, it is prohibited to boost voltage without load, or to connect with resistive load.
VLF Hipot Tester Parameters:
| Type |
Output
Voltage/
Current |
Load Capacity |
Control Unit |
Booster |
Fuse
Tube |
Frequency/
Capacitance |
Dim.
(cm) |
Wt
(kg) |
Dim.
(cm) |
Wt
(kg) |
| VLF-30 |
30KV/20mA |
0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF |
28× 37× 22 |
4 |
33× 18× 34 |
25 |
5A |
| VLF-40 |
40KV/30mA |
0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF |
28× 37× 22 |
4 |
35× 20× 36 |
35 |
6A |
| VLF-50 |
50KV/40mA |
0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF |
28× 37× 22 |
4 |
37× 24× 39 |
45 |
7A |
| VLF-60 |
60KV/50mA |
0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF |
28× 37× 22 |
4 |
33× 18× 34
33× 18× 34 |
25+25 |
10A |
| VLF-70 |
70KV/55mA |
0.1 Hz, ≤ 0.5µ F
0.05Hz, ≤ 1.0µ F
0.02Hz, ≤ 2.5µ F |
28× 37× 22 |
4 |
33× 18× 34
35× 20× 36 |
25+35 |
10A |
| VLF-80 |
80KV/60mA |
0.1 Hz, ≤ 0.5µ F
0.05Hz, ≤ 1.0µ F
0.02Hz, ≤ 2.5µ F |
28× 37× 22 |
4 |
33× 18× 34
37× 24× 39 |
25+45 |
12A |
VLF Hipot Tester Features:
- Data of current, voltage, wave form can be directly sampled at high voltage side, so the data is real and accurate.
- Overvoltage protection: If the output exceeds the set limit of voltage, the instrument will shut-down to protect itself, the actuation time is less than 20ms.
- Overcurrent protection: it is high-low voltage dual protection in the design, the accurate shut-down protection can be made according to the set value at high voltage side; If the current on low voltage side exceeds the rated current, the instrument will take shut-down protection, the actuation time are both less than 20ms.
- A high voltage output protective resistor is provided in the voltage boost body in the design and this eliminates the need of additional protective resistor connected outside.
Notes:
- Power supply requirement: AC50Hz, 220V, stability of frequency: fluctuation less than 0.5%.
- When using it, the capacitance of the sample should not exceed the rated capacity of the instrument. The overlow capacitance of the sample will affect the output wave form. If the capacitance is less than 0.05µF, the instrument cannot output normally.
- When using it, it is prohibited to boost voltage without load, or to connect with resistive load.
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