VLF High Voltage Generators
Ultra-Low Frequency Dielectric Loss Tester from China Suppliers and Factory for Medium-Voltage Cable Testing
Introducing the Ultra-Low Frequency Dielectric Loss Tester, a leading solution for medium-voltage cable testing that complies with the European Committee for Electrotechnical Standardization (CENELEC) standards HD 620 S1:1996 and HD 621 S1:199This advanced device generates a 0.1Hz sine wave voltage of up to 24kV RMS, making it ideal for detecting insulation faults, particularly water tree damage, in both polyethylene (PE) and cross-linked polyethylene (XLPE) cables, as well as in paper-insulated cables, As a reliable product from trusted suppliers in China, this tester ensures that the testing procedure does not cause any damage to fault-free insulation. In addition to dielectric loss testing, it evaluates the dielectric breakdown strength of cables using both positive and negative DC voltages, along with trapezoidal AC voltage (rectangular wave voltage). The system automatically adjusts the slew rate of the rectangular wave voltage based on cable capacitance, Furthermore, with additional leakage current measurement in DC mode, users can assess the relative quality of cable insulation effectively. The unique sine wave test voltage allows for direct measurement of the cable’s dielectric loss factor, providing insights into the deterioration level of the cable insulation, For more detailed information on this innovative testing solution, please refer to the relevant manuals. Trustworthy and efficient, the Ultra-Low Frequency Dielectric Loss Tester exemplifies quality and precision, making it the preferred choice for factories and suppliers looking to ensure the integrity of their medium-voltage cable installations
The Ultra-Low Frequency Dielectric Loss Tester combines the following features and functions:
- Full AC voltage testing up to 24/31.8 kV RMS (sine wave voltage)
- Integrated ultra-low-frequency withstand voltage and dielectric loss factor testing
- Additional output voltage waveforms of DC and rectangular waves
- Sheath testing and pinpointing up to 10 kV
- Leakage current measurement
- Manual and automatic frequency adjustment
- Voltage breakdown detection with automatic disconnection of the high-voltage connection
- Logging to internal memory, exportable to a computer via USB stick for generating test reports
- Firmware updates via USB
Voltage & Current Specifications
| Output Voltage Specs | ||
|---|---|---|
| Model | BVLF-34kV | BVLF-45kV |
| Output Voltage (Sine Wave) | max.24kVRMS (34kVPEAK) | max.31.8kVRMS (45kVPEAK) |
| DC Voltage | ±1–34kV | ±1–45kV |
| Resolution | 0.001kV | 0.001kV |
| Accuracy | 1% | 1% |
| Output Current Specs | ||
| Measurement Range | 0–14mA | 0–14mA |
| Resolution | 1µA | 1µA |
| Accuracy | 1% | 1% |
| Maximum Capacitance Load |
0.1Hz@0.5µF/24kVrms/34kVpeak 0.05Hz@1.0µF/24kVrms/34kVpeak 0.01Hz@8.0µF/18kVrms/25kVpeak |
0.1Hz@0.5µF/31.8kVrms/45kVpeak 0.05Hz@1.0µF/31.8kVrms/45kVpeak 0.01Hz@5.0µF/22kVrms/31kVpeak |
Dielectric Loss Factor & General Specifications
| Dielectric Loss Factor Measurement (BVLF TD) | ||
|---|---|---|
| VLF-Sine | 1-24kVrms | 1-31.8kVrms |
| Load Range | 1nF-8uF | 1nF-5uF |
| Resolution | 1×10-5 | 1×10-5 |
| Accuracy | 1×10-4 | 1×10-4 |
| Measurement Range | 1×10-4 – 9999.9×10-4 | 1×10-4 – 9999.9×10-4 |
| tan-δ Measurement Frequency | 0.1Hz | 0.1Hz |
| General Information | ||
| Power Consumption | max.300VA | max.400VA |
| Reverse Voltage Protection | 13kV | 15kV |
| Data Interface | USB 2.0 | |
| Dimensions (W x H x D) | Peli Case 1430, 430 mm x 240 mm x 340 mm | |
| Weight | 22kg | |
| Ambient Temperature (Operating) | -10 to +50°C | |
| Storage Temperature | -20 to +60°C | |
| Safety & EMC Compatibility | Complies with CE standards, Low Voltage Directive (2014/35/EC), Electromagnetic Compatibility Directive (2014/30/EC), Environmental Impact EN60068-2 and subsequent versions | |
| User Interface Languages | English, Chinese (Simplified), Russian, Spanish, etc. | |
Frequently Asked Questions (FAQ)
What is the maximum output voltage of the ULF Dielectric Loss Tester?
The tester offers different output levels depending on the model. The BVLF-34kV model provides a maximum sine wave output of 24kV RMS (34kV Peak), while the BVLF-45kV model delivers up to 31.8kV RMS (45kV Peak).
Does the tester support automatic voltage disconnection in case of breakdown?
Yes. The tester features integrated voltage breakdown detection. Once a breakdown is identified, it automatically disconnects the high-voltage connection to ensure safety.
How can I export test reports from the device?
Test results are logged directly to the device’s internal memory. You can easily export this data to a computer via a standard USB flash drive to generate professional test reports.
What safety and EMC standards does this equipment comply with?
The device fully complies with CE standards, the Low Voltage Directive (2014/35/EC), the Electromagnetic Compatibility Directive (2014/30/EC), and the Environmental Impact standard EN60068-2.
What is the measurement resolution for the Dielectric Loss Factor (tan-δ)?
The dielectric loss factor measurement (BVLF TD) features a high-precision resolution of 1×10-5, with an accuracy of 1×10-4 and a measurement range of 1×10-4 to 9999.9×10-4.
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