Variable Frequency Very Low Frequency Test Customized Input Power
Supply
Product Name: Very Low Frequency tester VLF-40KV
Equipment Description:
The VLF testers (Generator) are suitable for Testing cables,
transformers, switchgear, Rotating machinery, and other Electrical
apparatus.
Specifications:
1. Input: 120 ± 10% Volts AC, 50/60 Hz, single phase.
2. Output-Voltage. 50KV
3. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz.
4. Stability of frequency: Fluctuation < 0.5%
5. Measurement accuracy: ± 3%.
6. Positive and negative voltage peak errors: ≤ 3%.
7. Voltage waveform distortion: ≤ 5%
8. Construction: In two units: Controller and Booster...
9. Ambient conditions of use: Temperature Indoor and outdoor: -10ºC
to + 50ºC.
10. Humidity: ≤ 85%
Main Functions:
1. Easiest to use Fully automatic microcontroller
2. Built-in printer
3. True sine wave output
4. Real-time display of actual output waveform
5. Ergonomic, menu guided, large backlit LCD
6. Storage of test results for later retrieval and print.
7. Over voltage and current protected
8. Variable frequency 0.1Hz, 0.05Hz, 0.02 Hz
9. Data of current, voltage and waveform directly sampled at HV
side.
10. AC testing does not degrade good cable insulation
11. Harmful space charges are not injected into the cable
insulation
12. No traveling waves are generated during testing
13. Rugged and reliable design less prone to failure from
transients
14. Short circuit protected.
15. Status display of all important safety functions and messages.
16. Safe, easy to use operation with emergency off and key switch
lock-out.
17. Fully integrated discharge circuit to safely ground the DUT
after testing.
18. Zero start interlock.
19. Zero voltage switching.
Models:
Type
| Output
Voltage/Current | Load Capacity | Control Unit | Booster | Fuse Tube |
Frequency/Capacitance
| Dim.
(cm) | Wt
(kg) | Dim.
(cm) | Wt
(kg) |
VLF-30/1.1 | 30KV/20mA | 0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF | 28× 37× 22 | 4 | 33× 18× 34 | 25 | 5A |
VLF-40/1.1 | 40KV/30mA | 0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF | 28× 37× 22 | 4 | 35× 20× 36 | 35 | 6A |
VLF-50/1.1 | 50KV/40mA | 0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF | 28× 37× 22 | 4 | 37× 24× 39 | 45 | 7A |
VLF-60/1.1 | 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-70/0.5 | 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-80/0.5 | 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 |
When using it, the capacitance of the sample should not exceed the
rated capacity of the instrument. The over low capacitance of the
sample will affect the output wave form. If the capacitance is less
than 0.05μF, the instrument cannot output normally. In this
situation, the tester needs to have a 0.05μF compensation
capacitor(provided by our company) in parallel connection as an
auxiliary output when the sample’s capacitance is less than 0.05μF.
