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 wave 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 proven that using 0.1Hz ultra-low frequency withstand voltage testing instead of power frequency withstand voltage testing not only provides equivalent effectiveness but also significantly reduces the equipment size and weight. Theoretically, the capacity is about one five-hundredth of that of power frequency, and it is simpler to operate, offering more advantages compared to power frequency testing. 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.
Incorporating modern digital frequency conversion advanced technology, it uses microcomputer control for automatic voltage increase, decrease, and discharge, with photoelectric control output of 0.1Hz sine wave, and allows manual intervention during the automatic voltage increase process. Due to full electronification, it is small in size and light in weight, with a large LCD screen that is clear and intuitive, and can display the output waveform with print output. The design specifications fully comply with the industry standard "General Technical Conditions for Special Test Instruments for Power Equipment, Part 4: General Technical Conditions for Ultra-low Frequency High Voltage Generators", 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 wave 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 test voltage exceeds the set value by ten percent (or 1.1 times), the instrument will shut down for protection, with an action time of less than 20 milliseconds.
Overcurrent Protection: Designed with dual protection for high and low voltage sides. The high-voltage side can perform precise shutdown protection according to the set value; the low-voltage side will shut down for 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 proven that 0.1Hz ultra-low frequency withstand voltage testing instead of power frequency withstand voltage testing not only provides equivalent effectiveness but also significantly reduces the equipment size and weight, with capacity about one five-hundredth of that of power frequency, greatly simplifying the test procedure, and offering more advantages compared to power frequency testing. This is why developed countries widely adopt this method. The Ministry of Electric Power of China 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 this method is being promoted in China. This instrument is developed according to this need in China. It can be widely used in AC withstand voltage testing of cables, large high-voltage rotating motors, and power capacitors.
1. Output voltage: 0-30kV (peak value) or 0-50kV (peak value) or 0-80kV (peak value) or 0-90kV (peak value) (optional).
2. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz.
3. Frequency modulation: automatic and manual.
4. Output waveform: sine wave.
5. Voltage measurement error: ≤3%.
6. Current measurement error: ≤5%.
7. Overvoltage protection: when the voltage exceeds 1.1 times the set value, it automatically shuts down.
8. Overcurrent protection: when the current exceeds the rated value, it automatically shuts down.
9. Display: large screen LCD display, Chinese menu, with print output.
10. Working power supply: AC 220V ±10%, 50Hz.
11. Ambient temperature: -10℃～+40℃.
12. Relative humidity: ≤85% (at 25℃).
13. Dimensions and weight: depending on the model.
1. Small size, light weight, easy to carry, and simple to operate.
2. Using digital frequency conversion technology, the output waveform is a standard sine wave with good frequency stability.
3. Overvoltage, overcurrent, and zero-start protections ensure safe operation.
4. Large screen LCD display, Chinese menu, clear and intuitive, can display the output waveform and has print output.
5. Automatic voltage increase, decrease, and discharge, with manual intervention possible during the automatic voltage increase process.
6. The instrument has a self-check function and can automatically detect faults.
7. The instrument has a data storage function, which can store test data for easy query.
8. The instrument has a communication interface for connection to a computer for data processing and printing.
The ultra-low frequency high voltage generator mainly consists of a control host and a high-voltage boosting device. The control host uses a microcomputer to control the generation of 0.1Hz ultra-low frequency signals, and after power amplification, it is boosted by the high-voltage boosting device to output ultra-low frequency high voltage. The instrument has a compact structure, is easy to operate, and is safe and reliable.
1. Connect the instrument to the test object correctly.
2. Turn on the power switch, and the instrument will perform a self-check.
3. Set the test voltage, frequency, and time according to the test requirements.
4. Press the start button, and the instrument will automatically boost the voltage.
5. During the test, the instrument will automatically record the test data.
6. After the test, the instrument will automatically discharge and display the test results.
7. Turn off the power switch and disconnect the test wiring.
1. The instrument must be reliably grounded.
2. During the test, it is strictly forbidden to touch the high-voltage output terminal.
3. Before the test, check whether the test object is discharged.
4. The instrument should be kept away from moisture, vibration, and strong magnetic fields.
5. When the instrument is not in use for a long time, it should be stored in a dry and ventilated place.
6. If the instrument malfunctions, it should be repaired by professionals.
1. Regularly check whether the instrument's grounding wire is in good condition.
2. Regularly clean the instrument's surface dust to keep it clean.
3. Regularly check whether the instrument's connecting wires are loose.
4. If the instrument is not used for a long time, it should be powered on and tested regularly.
5. If the instrument fails, it should be repaired by professionals.
