Ultra-low Frequency High Voltage Generator - Yangzhou Darui
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Product Features
1. Ultra-low Frequency High Voltage Generator with rated voltage less than or equal to 50kV adopts a single-unit structure (one booster); those above 50kV adopt a series structure (two boosters in series), greatly reducing overall weight and enhancing load capacity. Moreover, the two boosters can be used separately as ultra-low frequency generators of lower voltage levels.
2. Current, voltage, and waveform data are all sampled directly from the high-voltage side, ensuring data accuracy.
3. Overvoltage protection function: when the output exceeds the set voltage limit, the instrument will shut down for protection, with an action time of less than 20ms.
4. Overcurrent protection function: 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 shut down for protection when the current exceeds the rated current, with an action time of less than 20ms.
5. The high-voltage output protection resistor is designed inside the booster, so no external protection resistor is needed.
6. Due to the adoption of a high-low voltage closed-loop negative feedback control circuit, the output has no capacitive rise effect.
Product Introduction
The ultra-low frequency insulation withstand voltage test is actually an alternative method to the power frequency withstand voltage test. As we know, when conducting power frequency withstand voltage tests on large generators, cables, and other test objects, due to their large capacitance in the insulation layer, a large-capacity test transformer or resonant transformer is required. Such huge equipment is not only bulky and expensive but also very inconvenient to use. To solve this contradiction, the power sector has adopted a method of reducing the test frequency, thereby reducing the capacity of the test power supply. Years of theory and practice at home and abroad have proven that using 0.1Hz ultra-low frequency withstand voltage test instead of power frequency withstand voltage test not only provides the same equivalence but also greatly reduces the size and weight of the equipment. Theoretically, the capacity is about one five-hundredth of that at power frequency, and it is simple to operate, with more advantages compared to power frequency tests. This is why developed countries widely adopt this method. The National Development and Reform Commission has formulated the industry standard "Test Method for Ultra-low Frequency (0.1Hz) Withstand Voltage of Cross-linked Polyethylene Insulated Power Cables up to 35kV and Below." China is promoting this method, and this instrument is developed based on this national need. It can be widely used in AC withstand voltage tests for cables and large high-voltage rotating motors.
This product combines modern digital frequency conversion advanced technology, adopts microcomputer control, and fully automates voltage boosting, voltage reduction, measurement, and protection. 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 output waveforms and print test reports. The design indicators fully comply with the power industry standard "General Technical Conditions for Special Test Instruments for Power Equipment, Part 4: General Technical Conditions for Ultra-low Frequency High Voltage Generators," making it very convenient to use. Currently, mechanical methods are used at home and abroad for modulation and demodulation to generate ultra-low frequency signals, resulting in non-standard sine waveforms, large measurement errors, spark discharge in the high-voltage part, bulky equipment, and the need for high-power high-voltage resistors for discharge shaping in the second and fourth quadrants of the sine wave, resulting in high overall power consumption. This product can overcome these shortcomings.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
