KDVLF-30 Very Low Frequency High Voltage Generator
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I. Product Overview
The KDVLF-30 Very Low Frequency High Voltage Generator is mainly used for non-destructive insulation withstand voltage tests on plastic power cables such as PE (polyethylene) / XLPE (cross-linked polyethylene) in the power sector, It has functions such as power supply overcurrent, high voltage overcurrent, oil tank overheat protection, and the high voltage cannot be started if the output voltage regulator is not returned to zero. It is a replacement for traditional power frequency withstand voltage test equipment.
Product Features
1. For very low frequency with rated voltage less than or equal to 30kV, a single-stage structure is adopted (one voltage booster); for very low frequency above 30kV, a series structure is adopted (two voltage boosters in series), which greatly reduces the overall weight and enhances the load capacity. Moreover, the two voltage boosters can be used separately as very low frequency for lower voltage levels.
2. Current, voltage, and waveform data are all directly sampled from the high-voltage side, so the data is accurate.
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 be shut down for protection according to the set value; when the current on the low-voltage side exceeds the rated current, it will shut down for protection, with an action time of less than 20ms.
5. The high-voltage output protection resistor is designed inside the voltage booster, so no external protection resistor is needed.
6. Due to the use of a high-low voltage closed-loop negative feedback control circuit, there is no capacitive rise effect in the output.
Technical Parameters
1. Output rated voltage: 0～30kV
(Applicable to withstand voltage tests for cables of 10kV and below with a length of 0-10 kilometers, generator withstand voltage tests, etc.)
2. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz
3. Output frequency load capacity: at 0.1Hz up to 1.1µF
at 0.05Hz up to 2.2µF
at 0.02Hz up to 5.5µF
4. Output frequency can be adjusted to 0.1, 0.05, and 0.02Hz;
5. Measurement accuracy: 3%
6. Voltage positive and negative peak error: ≤3%
7. Voltmeter accuracy: ≤3%
8. Ammeter accuracy: ≤5%
9. Voltage waveform distortion: ≤5%
10. Power supply: frequency 50Hz, voltage 220V±5%.
11. Power supply fuse: 20A
12. Operating conditions: temperature: -10℃～+40℃; humidity: ≤85%RH
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
