Very Low Frequency Tester
Product Introduction
The VLF Hipot Tester is designed for voltage withstand testing of electrical equipment with large equivalent insulation capacitance. Utilizing digital frequency conversion technology and microprocessor control, it connects the controller to the high-voltage generator via a low-voltage link with photoelectric isolation. The system incorporates a closed-loop negative feedback control circuit between high and low voltage stages, ensuring stable output without capacitive rise effect.
Technical parameter
| مزود الطاقة | AC220V±5%, 50/60Hz. If using a generator, it must be a digital inverter generator with 220V output and power >8kW. Ordinary generators or UPS power supplies are prohibited. |
| Output Voltage | 30kV, 40kV, 50kV, 60kV, 70kV, 80kV, 80kV, 90kV |
| تردد الخرج | 0.1Hz, 0.05Hz, 0.02Hz,0.01Hz |
| Load Capacity | 0.1Hz-0.5μF, 0.05Hz-1.0μF,0.02Hz-2.5μF,0.01Hz-5μF |
| دقة القياس | 3% |
| Voltage positive,negative peak error | ≤3% |
| تشويه الموجي الجهد | ≤5% |
| Operating Environment | Temperature: -10℃~+40℃ |
| رطوبة | ≥85% رطوبة نسبية |
Ultra-low frequency series products
| Model number | الفولطية | Carrying capacity | Power supply fuse | Generator power | Product structure, weight |
| 30/1.1 | 30kV(peak) | 0.1Hz, ≤1.1μF | 10 أ | >3kW | Controller: 4kg, booster: 25kg |
| 0.05Hz,≤2.2μF | |||||
| 0.02Hz,≤5.5μF | |||||
| 0.01Hz,≤11μF | |||||
| VLF-40kV | 40kV(peak) | 0.1Hz,≤0.8μF | 15 أ | >4kW | Controller: 4kg, booster: 25kg |
| 0.05Hz,≤1.6μF | |||||
| 0.02Hz,≤4μF | |||||
| 0.01Hz,≤8μF | |||||
| VLF-50kV | 50kV(peak) | 0.1Hz，≤0.7μF | 20 أ | >5kW | Controller: 4kg, booster: 35kg |
| 0.05Hz，≤1.4μF | |||||
| 0.02Hz，≤3.5μF | |||||
| 0.01Hz,≤7μF | |||||
| VLF-60kV | 60kV(peak) | 0.1Hz,≤0.6μF | 20 أ | >6kW | Controller: 4kg, booster: 45kg |
| 0.05Hz,≤1.2μF | |||||
| 0.02Hz,≤3μF | |||||
| 0.01Hz,≤6μF | |||||
| VLF-80kV | 80kV(peak) | 0.1Hz,≤0.5μF | 30 أ | >8kW | Controller: 4kg, booster: 50kg |
| 0.05Hz,≤1.0μF | |||||
| 0.02Hz,≤2.5μF | |||||
| 0.01Hz,≤5μF | |||||
| VLF-90kV | 90kV(peak) | 0.1Hz,≤0.4μF | 30 أ | >9kW | Controller: 4kg, booster: 55kg |
| 0.05Hz,≤.0.8μF | |||||
| 0.02Hz,≤2.0μF | |||||
| 0.01Hz,≤4μF |
Comparison of mechanical and electronic performance of 0.1Hz voltage test equipment
| 0.1Hz Voltage resistant device type | High pressure control system | High voltage waveform | Energy saving | noise | Mechanical life | Electrical life |
| Mechanical type | High voltage mechanical switch toggles polarity | Square wave | No energy saving: the excess energy is consumed with high-power resistance | high | short | short |
| Electronic type | High voltage electronic switches switch polarity | Sinusoidal wave | Energy conservation: Excess power is fed back into the grid | slight | There is no | long |
Performance comparison of various pressure test equipment
| Comparative content | Power frequency withstand voltage | Variable frequency voltage resistance | Withstand voltage 0.1Hz | Dc voltage resistance |
| equivalence | good | good | good | In general |
| Insulation destructiveness | small | small | small | larger |
| Operational safety | lower | lower | high | lower |
| Test connection | complex | complex | simple | simple |
| Equipment volume | maximum | larger | small | small |
مواصفات المنتج
1. High degree of intelligence: adopting digital frequency conversion technology, microcomputer control, fully automatic testing processes such as boost, buck, and measurement.
2. Easy to operate: simple wiring, 7-inch LCD touch screen, convenient operation, friendly human-computer interaction.
3. Comprehensive protection: Multiple protections (overvoltage protection, high and low voltage side overcurrent protection), quick action (action time ≤ 10ms), instrument safety and reliability.
4. Safe and reliable: The controller is connected to the low-voltage generator through photoelectric control, ensuring safe and reliable use.
5. Adopting high and low voltage closed-loop negative feedback control circuit, the output has no capacity rise effect.
6. Accurate sampling: High voltage current and voltage data are directly obtained through high-voltage side sampling, so the data is true and accurate.
7. Fully equipped: 7-inch capacitive touch screen, LCD Chinese character display, automatic storage, and automatic printing.
8. Wide testing range: Multiple frequency options of 0.1Hz, 0.05Hz, 0.02Hz, and 0.01Hz, with a wide testing range.
9. Easy to carry: The instrument has a small size and light weight, making it very suitable for outdoor operation.
10. Multi language display: Chinese English switching function, customizable for other languages.
Transportation and storage
1) Transportation
This product must be packed during transportation. Cartons or wooden cases can be used as packing cases, and foam shockproof layer should be padded in the packing cases. Packaged products should be able to be transported by road, railway, and air. During transportation, it is not allowed to be placed in an open cargo box. The warehouse should pay attention to rain, dust, and mechanical damage prevention.
2) Storage
When the instrument is not in use, it should be stored indoors in an environment with a humidity of -20 ℃ to+60 ℃, a relative humidity not exceeding 85%, ventilation, and no corrosive gases. Storage should not be placed close to the ground or walls. In humid areas or seasons, if this instrument is not used for a long time, it is required to be powered on once a month (about two hours) to dissipate moisture and protect the components
Precautions
Strict attention should be paid to the following points during the experiment:
1) The booster equipped with this instrument shall not be used for other purposes.
2) Do not place the booster on the side or upside down to prevent the leakage of internal insulation oil.
3) If the instrument is charged inside and malfunctions due to operation or wiring errors, do not disassemble and repair it yourself to avoid accidents. Instead, contact our company for repair.
4) To ensure personal safety, a safe distance must be maintained before and during the experiment.
5) Before or after starting the voltage boosting process, a discharge rod should be used to fully discharge the test sample.
6) When connecting, disconnecting, or temporarily not using the instrument, the power should be turned off
