

    Ultra low frequency insulation withstand voltage test is an alternative method for power frequency withstand voltage test.
    Using 0.1Hz ultra low frequency withstand voltage test replace power-frequency withstand voltage test, not only is equivalent to the same equipment, and greatly reduces the volume and the weight, so the ultra-low frequency withstand voltage device is widely used in large generators, cables, power capacitor test AC voltage withstand test products.
Product Features
- Data of current and voltage are obtained directly through the sampling of high-pressure side and it is true and accurate. 
- Over-voltage protection: the instrument will shut down to protection within 20 ms when the output voltage is exceeding limiting values of setting. 
- Over-current protection: design for dual protection of high and low voltage, downtime protection can be accurately set in high-pressure side. Shut down to protection times is within 20 ms when the current of low-voltage sides exceeds reacted current. 
- High-voltage output protection resistor design in the body boost and it is no need to additional outside resistor. 
- Closed-loop negative feedback control circuit of high and low voltage. 
Product Parameters
| Peak voltage | 90kV | 
| Test frequency | 0.1Hz/0.05Hz/0.02Hz (selectable) | 
| Load capacity | 0.1Hz/0.05Hz/0.02Hz (selectable) | 
| 0.1 Hz Maximum 0.5µF | |
| 0.02 Hz Maximum 2.5µF | |
| Measurement accuracy | ±(3% full-scale +0.5KV) | 
| Waveform distortion | ≤5% | 
| Working environment | Indoor or outdoor; -10ºC-+40ºC; ≤85%RH | 
| Power supply | AC 50 Hz,220V ±5% | 
| Fuse | 10A | 
VLF HV Tester Series
| Model no | Rated Voltage/current | Load Carrying Capacity | Power FuseTube | Product Structure and Weight | 
| VLF-30 | 30kV/20mA (Peak) | 0.1Hz,≤1.1µF | 5A | Controller:4KG Booster: 25KG | 
| 0.05Hz,≤2.2µF | ||||
| 0.02Hz,≤5.5µF | ||||
| VLF-50 | 50kV/30mA (Peak) | 0.1Hz,≤1.1µF | 15A | Controller:4KG Booster: 50KG | 
| 0.05Hz,≤2.2µF | ||||
| 0.02Hz,≤5.5µF | ||||
| VLF-90 | 90kV/30mA (Peak) | 0.1Hz,≤0.5µF | 20A | Controller:4KG Booster Grade 1(40kV):25KG Booster Grade 2(50kV):50KG | 
| 0.05Hz,≤1µF | 






 
                    





















