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HRVLF Series of Portable 0.1HZ Digital Very-low-Frequency High Voltage Tester
  
     
  The new generation of AC withstand tester, replacing harmonic withstand tester, is widely used in AC withstand test of large capacity equipments such as generator, cable, insulator, power capacitor, large transformer etc. Not only can it be the first choice of on-site and outdoor testing, but also as the ultra-low frequency source.

Advantage of 0.1Hz HRVLF series
1、Small volume, light weight, easily to operate. Theoretically speaking, the capacity is of 1/500 of power Frequency.
2. AC ultra-low frequency tester doesn’t form tree-clearance in the insulating condition.
3. Unlike DC test, it’s uneasy to destroy cables; meanwhile the capacitance effect of testing articles has no influence to it.
4. Pernicious polarization charge would make no way to dielectric during the testing.

Features of function
1. Adopting digital convention technology and microcomputers controlling system make the testing process completely automatic.
2. The large screen of liquid crystal and Chinese input operating system insure that testing wave-form (Sinusoid Wave) can be displayed; testing reports can be printed.
3. Auto-protection of over-current and over-voltage, the research，design and manufacture of independent intellectual property rights according to power standard
4. Multi-frequency selections (0.1Hz，0.05Hz，0.02Hz) strengthen the load-bearing capability.

 
     
 
Specification of this series (special order testing equipment is also available)
 
Type
Rated voltage
Carrier load capacity
Weight
HRVLF-30/1.1
(applied for 10kv Large capacity
product withstand testing)
30（40）KV
（peak）
0.1Hz，≤1.1uF
0.05Hz，≤2.2uF
0.02Hz，≤5.5uF
Controller：4kg
pressure Booster：25kg
HRVLF-50/5
Breakdown tester
( applied for 10kv extra Large capacity product withstand testing
50KV
（peak）
0.1Hz，≤5uF
0.05Hz，≤10uF
0.02Hz，≤25uF
Controller：5kg
pressure Booster：60kg
HRVLF-80/1.1
(applied for 35kv large capacity
product withstand testing)
80（90）KV
（peak）
0.1Hz，≤1.1uF
0.05Hz，≤2.2uF
0.02Hz，≤5.5uF
controller：5kg
pressure booster：45kg
 
     
  1. Measuring accuracy: 2.5%
2. Voltage error of peak-peak: ≤2.5%
3. Distortion of voltage waveform: ≤5%
4. Using condition: indoor, outdoor: Temperature: -10~+40℃; Humidity: ≤85%RH
5. Power: AC 50HZ，220V±5%
6. Equivalence: scientific theories and tests can prove that 0.1Hz ultra-low frequency withstand testing is as equivalent as industrial frequency withstand testing.
  
     
  Withstand testing comparison of 0.1Hz ultra-low frequency, industrial frequency, abnormal frequency and DC.  
 
Items
Power frequency
hi-pot testing
Variable frequency
hi-pot testing
0.1Hz hi-pot testing
DC hi-pot testing
Equivalence
Good
Good
Good
Not so good
Insulation damage
Little
Little
Little
Large
Operating safety
Relatively low
Relatively low
high
Relatively low
Test wiring
Complex
Most complex
Simplest
Complex
Volume,weight of devices
Heaviest
Relatively heavy
Light
The lightest
 
     
 
 
     
     
     
     
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