Instrument Overview:
Ultra-low-frequency high-voltage generator [English abbreviation]: Ultra-low-frequency high-voltage generator. Currently, both domestic and international manufacturers use mechanical methods 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 section, bulky equipment, and the need for high-power high-voltage resistors in the second and fourth quadrants of the sine wave for discharge shaping, leading to high overall power consumption. Years of theoretical and practical experience both domestically and internationally have proven that using 0.1Hz ultra-low-frequency withstand voltage tests as a substitute for 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; it has been upgraded from the previous series output with a maximum voltage of 80KV to a single-stage direct output of 0-90KV.
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 insulation layers having large capacitance, a test transformer or resonant transformer with a large capacity is required. Such huge equipment is not only bulky and expensive but also very inconvenient to use. To resolve 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 theoretical and practical experience both domestically and internationally have proven that using 0.1Hz ultra-low-frequency withstand voltage tests as a substitute for 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. The test procedure is greatly simplified, 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." China is currently promoting this method, and this instrument has been developed based on this need. It can be widely used in AC withstand voltage tests for cables, large high-voltage rotating motors, and power capacitors.
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Output Rated Voltage |
(KV)30 50 80 |
Output Frequency |
0.1Hz, 0.05Hz, 0.02Hz |
Load Capacity |
0.1Hz Max 0.5μF |
0.05 Hz Max 1.1μF |
0.02 Hz Max 2.5μF |
Measurement Accuracy |
±(3% Full Scale + 0.5KV) |
Voltage Waveform Distortion |
≤5% |
Operating Conditions |
Temperature: -10℃∽+40℃; Humidity: ≤85%RH |
Power Supply |
AC 50 Hz, 220V ±5% |
Power Fuse |
See Table 1 |
