Ultra-low Frequency High Voltage Generator[English abbreviation]:Ultra-low-frequency high-voltage generator Currently, both domestic and international methods use mechanical modulation and demodulation to generate ultra-low frequency signals, resulting in non-standard sine waveforms, large measurement errors, spark discharge in the high-voltage section, bulky equipment, and the need for high-power high-voltage resistors to shape the second and fourth quadrants of the sine wave, leading to high overall power consumption. Years of theoretical and practical experience at home and abroad have shown that using 0.1Hz ultra-low frequency withstand voltage tests instead of power frequency withstand voltage tests not only provides equivalent effectiveness but also significantly reduces the size and weight of the equipment. Theoretically, the capacity is about one five-hundredth of that at power frequency, and the operation is simpler, offering more advantages compared to power frequency tests. This is why developed countries widely adopt this method.
After more than ten years of continuous research and development, the production technology of ultra-low frequency high voltage generators has become more lightweight and intelligent; the previous series output with a maximum voltage of 80KV has been upgraded to a single-stage direct output of 0-90KV.
Ultra-low Frequency High Voltage Generator: Ultra-low frequency withstand voltage tester, ultra-low frequency cable withstand voltage tester, ultra-low frequency generator withstand voltage tester, ultra-low frequency motor withstand voltage tester, programmable ultra-low frequency high voltage generator, ultra-low frequency AC withstand voltage tester.
Combining modern digital frequency conversion advanced technology, it adopts microcomputer control, automatic voltage boost, step-down, and discharge, using photoelectric control to output 0.1Hz sine wave, and manual intervention is possible during the automatic voltage boost process. Due to full electronization, it is small in size and light in weight, with a large-screen LCD display that is clear and intuitive, and can display the output waveform with print output. The design specifications fully comply with the "General Technical Conditions for Special Test Instruments for Power Equipment, Part 4: General Technical Conditions for Ultra-low Frequency High Voltage Generators" power industry standard, and it is very convenient to use. Currently, both domestic and international methods use mechanical modulation and demodulation to generate ultra-low frequency signals, resulting in non-standard sine waveforms, large measurement errors, spark discharge in the high-voltage section, bulky equipment, and the need for high-power high-voltage resistors to shape the second and fourth quadrants of the sine wave, leading to high overall power consumption. This product can overcome these shortcomings. In addition, the protection functions are designed as follows:
Overvoltage Protection: When the voltage exceeds the set test voltage value by ten percent (or 1.1 times), the instrument will stop for protection, with an action time of less than 20 milliseconds.
Overcurrent Protection: Designed with dual protection for high and low voltage. The high-voltage side can perform precise shutdown protection according to the set value; the low-voltage side will perform shutdown protection when the current exceeds the rated current, with action times both less than 20 milliseconds.
Such huge equipment is not only bulky and expensive but also very inconvenient to use. To solve this contradiction, the test frequency is reduced, thereby reducing the capacity of the test power supply. Years of theoretical and practical experience at home and abroad have shown that 0.1Hz ultra-low frequency withstand voltage tests instead of power frequency withstand voltage tests not only provide equivalent effectiveness but also significantly reduce the size and weight of the equipment, with a capacity of about one five-hundredth of that at power frequency, greatly simplifying the test procedure, and offering more advantages compared to power frequency tests. This is why developed countries widely adopt this method. China's Ministry of Electric Power has commissioned the Wuhan High Voltage Research Institute to draft the industry standard "Test Method for Ultra-low Frequency (0.1Hz) Withstand Voltage of 35KV and Below Cross-linked Polyethylene Insulated Power Cables", and China is promoting this method. This instrument is developed according to this need of our country. It can be widely used in AC withstand voltage tests for cables, large high-voltage rotating motors, and power capacitors.
1. Output voltage: 0-30kV (effective value) or 0-40kV (effective value) or 0-50kV (effective value) or 0-60kV (effective value) or 0-80kV (effective value) or 0-90kV (effective value) (optional); 2. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz; 3. Frequency modulation: 0.1Hz when the load is less than 1.1μF; 0.05Hz when the load is less than 2.2μF; 0.02Hz when the load is less than 5.5μF; 4. Accuracy: voltage measurement error ≤3%; current measurement error ≤3%; 5. Waveform distortion: output voltage waveform distortion ≤5%; 6. Voltage boost mode: linear boost, step boost, manual boost; 7. Protection function: overvoltage protection, overcurrent protection, discharge protection, and power-off protection; 8. Startup mode: soft start; 9. Display: large-screen LCD display, Chinese menu; 10. Ambient temperature: -10℃ to +40℃; 11. Relative humidity: ≤85%; 12. Power supply: AC220V ±10%, 50Hz; 13. Dimensions and weight: determined by the model.
1. The instrument adopts digital frequency conversion technology and microcomputer control, with fully automatic boost, step-down, and discharge functions, and manual intervention is possible during the automatic boost process. 2. It uses photoelectric control to output 0.1Hz sine wave, and the waveform is standard. 3. It has overvoltage, overcurrent, zero-start, and discharge protection functions, ensuring high safety. 4. It has a large-screen LCD display, which is clear and intuitive, and can display the output waveform with print output. 5. It is small in size and light in weight, making it easy to carry and use. 6. The design fully complies with the "General Technical Conditions for Special Test Instruments for Power Equipment, Part 4: General Technical Conditions for Ultra-low Frequency High Voltage Generators" power industry standard.
It is suitable for AC withstand voltage tests of cross-linked polyethylene insulated power cables, large high-voltage rotating motors, power capacitors, and other electrical equipment. It is especially suitable for on-site tests in power systems, and can also be used for preventive tests of electrical equipment in petrochemical, metallurgical, mining, railway, and other industries.
1. The instrument must be reliably grounded during use. 2. When the instrument is in the boost state, it is strictly forbidden to touch the high-voltage output terminal and the test product. 3. After the test, the instrument should be discharged before replacing the test product. 4. The instrument should be stored in a dry, ventilated, and non-corrosive gas environment. 5. If the instrument malfunctions, please contact the manufacturer for repair, and do not disassemble it without authorization.
