VLF (Very Low Frequency) Hipot Testers are suitable for testing power cables, transformers, switchgear, rotating machinery and other electrical apparatus.

The "VLF-P" series supply AC withstand voltage testing + PD(pc) + Capacity(μF).

-Micro-controller
-Advanced digital frequency technology
-Built-in printer
-Discharge free
-Portable
-60mins Continous working
-CE mark
-Patent
-5^th generation

                                    AC withstand voltage testing

                                DC withstand voltage testing


VLF Advantage 7. Easiest to use Fully automatic microcontroller.
8. H/L voltage closed loop negative feedback control circuit, output no capacity rise effect.
9. Built-in printer.
10. Built-in protective resistors.                               
11. Colour Touch LCD (154*86mm)operation, True sine wave output.
12. Real-time display of actual output waveform.        
13. Ergonomic, menu guided, large colour touch screen
14. Storage of test results for later retrieval and print.                        
15. Over voltage and current protected.
16.Auto variable frequency 0.1Hz, 0.05Hz, 0.02 Hz, 0.01 Hz.
17. 60 mins continuous working;
18. Data of current, voltage and waveform directly sampled at HV side.
19. Rugged and reliable design less prone to failure from transients.
20. Invatation Patent                                                    
21. Portable: Control unit + Booster (Tank)
22. CE mark.
23. RS232 for option.
24. Remote control system for option

Specification
1.Power: 220V ± 10% AC (110V can be customized), 50/60Hz, single phase;
2.Output-Voltage (Peak): 1 to rated value (KV), details see the below table;
3.Output frequency: 0.1Hz, 0.05Hz, 0.02 Hz, 0.01 Hz (auto variable frequency);
4.Load: 0.5μF (approx 6,000 ft of cable)  @ 0.1 Hz 
        1.0μF (approx 12,000 ft of cable) @ 0.05 Hz 
        2.5μF (approx 30,000 ft of cable) @ 0.02 Hz 
        5.0μF (approx 60,000 ft of cable) @ 0.01 Hz 
5. Stability of frequency: Fluctuation < 0.5%;
6. Measurement accuracy: ±3%;
7. Positive and negative voltage peak error: ≤3%;                              
8. Voltage waveform distortion: ≤5%;                                  
9. Construction: 1 Control unit + 1 Booster (≤60KV set);  1 Control unit + 2 Boosters(≥60KV set).
10. Ambient conditions of use: temperature Indoor and outdoor : -10ºC ~ + 50ºC.          
11. Humidity:≤85%  
12. Technical indexes of VLF tgδ test (for option):
  1) tgδ test voltage range: 1 to rated voltage (KV)
  2) Measurement voltage accuracy: 3%
  3) Dielectric loss test frequency: 0.1Hz
  4) Measurement range: 0.01×10^-3- 655.35×10^-3
  5) Dielectric loss accuracy: 1x10^-4
  6) Dielectric loss resolution: 1x10^-5
  7) Capacitance measurement range: 0.001μF-10μF
  8) Celectric capacity resolution: 0.001μF                     
  9) Current measurement range: 0-59mA                          
  10) Current resolution: 0.1mA
  11) Insulation resistance: 0.01GΩ-65.53GΩ
  12) Insulation resistance resolution: 10MΩ

13.Main technical indexes of VLF PD test (for buyer's option):
  1) Partial discharge measurement range: 0.1pc-5000pc
  2) Partial discharge detection sensitivity: 0.1pc
  3) Capacitance range: 0.001μF-10μF
  4) Sampling bits: 12 bits
  5) Sampling speed: 200M/S                                            
  6) Test voltage:  0 to rated value (KV)

14.DC leakage current measurement:
  1) Output rated voltage: same as rated AC voltage output
  2) Voltage accuracy: 3%
  3) Leakage current range: 0-2000μA or 0-20mA
  4) DC Current resolution: 1μA
  5) DC current accuracy: 3%
  6) It is necessary to parallel the capacitor we supplied if testing DC leakage current.

 

Field connection diagram (Test object: cable)





True LCD screenshoot test results








Function comparison of VLF series models
 

Package for transport :
 

 


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