HXCDP ultra-low frequency withstand voltage device

Product Introduction
The ultra-low frequency insulation withstand voltage test is actually an alternative method to the power frequency withstand voltage test. We know that when conducting power frequency withstand voltage tests on large generators, cables, and other test samples, large capacity test transformers or resonant transformers are required due to the large capacitance of their insulation layers. These huge devices are not only bulky and expensive, but also very inconvenient to use. In order to solve this contradiction, the power department has adopted reducing the testing frequency, thereby reducing the capacity of the testing power supply. From years of theoretical and practical experience both domestically and internationally, it has been proven that replacing the power frequency withstand voltage test with a 0.1Hz ultra-low frequency withstand voltage test not only achieves the same equivalence, but also greatly reduces the size and weight of the equipment. In theory, the capacity is about one fifth of the power frequency, and the operation is simple, making it more superior than the power frequency test. That's why developed countries generally adopt this method. The National Development and Reform Commission has formulated the industry standard for the ultra-low frequency (0.1Hz) withstand voltage test method of 35kV and below cross-linked polyethylene insulated power cables. This method is being promoted in our country, and this instrument has been developed according to the needs of our country. It can be widely used in AC voltage withstand tests for cables and large high-voltage rotating motors.

Product features
The current, voltage, and waveform data are all directly sampled from the high voltage side, so the data is accurate.
Ø It has overvoltage protection function. When the output exceeds the set voltage limit, the instrument will stop for protection, with an action time of less than 20ms.
Ø Equipped with overcurrent protection function: designed with high and low voltage dual protection, the high voltage side can be precisely shut down for protection according to the set value; When the current on the low-voltage side exceeds the rated current, a shutdown protection will be implemented, with an action time of less than 20ms.
The high-voltage output protection resistor is designed inside the boost body, so there is no need to connect another protection resistor externally.
Due to the use of high and low voltage closed-loop negative feedback control circuits, there is no capacitance rise effect in the output.

Main technical indicators
Output rated voltage: 30kV, 80kV
Output frequency: 0.1Hz, 0.05Hz, 0.02Hz
Ø Load capacity: 0.1Hz maximum 1.1 µ F 0.05Hz maximum 2.2 µ F 0.02Hz maximum 5.5 µ F
Ø Measurement accuracy: 3%
Voltage positive, negative peak error: ≤ 3%
Voltage waveform distortion: ≤ 5%
Usage conditions: indoor and outdoor; Temperature: -10 ℃ to+40 ℃; Humidity: ≤ 85% RH
Ø Power fuse: Refer to Table 1
Ø Municipal power supply: frequency 50Hz, voltage 220V ± 5%
Output rated voltage: 30kV, 80kV
Output frequency: 0.1Hz, 0.05Hz, 0.02Hz
Ø Load capacity: 0.1Hz maximum 1.1 µ F 0.05Hz maximum 2.2 µ F 0.02Hz maximum 5.5 µ F
Ø Measurement accuracy: 3%
Voltage positive, negative peak error: ≤ 3%
Voltage waveform distortion: ≤ 5%
Usage conditions: indoor and outdoor; Temperature: -10 ℃ to+40 ℃; Humidity: ≤ 85% RH
Ø Power fuse: Refer to Table 1
Ø Municipal power supply: frequency 50Hz, voltage 220V ± 5%