30KV VLF Cable Hipot Test Kit High Voltage Generator Electric Tester
VLF Testing can be performed in different ways:
- Withstand Approach: This is a simple pass/fail test where the cable is subjected to an AC voltage for a specified testing time without flashover. The goal is to detect potential failures in the cable insulation during a planned outage. This approach is described in standards like IEC 60502 and IEEE 400.2.
- Monitored Withstand Approach: In this approach, a diagnostic measurement is made before and during the test to optimize the test time and make additional decisions before reaching the final test voltage. This approach can help identify cables that are not good candidates for withstand testing based on diagnostic indications obtained at lower voltages.
- Insulation Loss Measurement: VLF can be used to measure insulation losses, also known as the insulation dissipation factor or Tan-delta. This is typically performed over a range of test voltages depending on the standard or guide being followed.
- Partial Discharge Detection: VLF can also be used to detect and measure partial discharge in high voltage apparatus. This is outlined in IEEE 400.3 and IEC 60270. The test is typically performed over a range of test voltages to identify different defects and their inception and extinction voltages.
VLF Cable Hipot Test Kit 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.
VLF Cable Hipot Test Kit 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 |
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.
More Details for VLF Cable Hipot Test Kit
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