Program-controlled ultra-low-frequency cable withstand and high voltage test device

HNVLF program-controlled ultra-low frequency cable high voltage withstand test device is an alternative method to ultra-low frequency insulation withstand voltage test, which is actually a power frequency withstand voltage test. We know that in the power frequency withstand voltage test of large generators, cables and other test articles, due to their insulation layer presents a large capacitance, so the need for a large capacity test transformer or resonant transformerultra-low frequency insulation withstand voltage test is actually a substitute for the power frequency withstand voltage test. We know that when conducting power frequency withstand voltage tests on large generators, cables, etc., because their insulation layers present large capacitance, large capacity test transformers or resonant transformers are required.
 

   Ultra-low frequency cable high voltage withstand test deviceproducts are especially suitable for electrical equipment with large insulation equivalent capacitance, such as: insulators, power cables, power capacitors, large and medium-sized generators and motors and other equipment withstand voltage test, ultra-low frequency high voltage generator in line with the 2004 national new power industry standard "ultra-low frequency high voltage generator general technical conditions DL/T849.4-2004" requirements.

product characteristics

  1, voltage, current, waveform data are directly obtained through high-voltage side sampling, so the data is true and accurate;

  2. Overvoltage protection: When the output exceeds the set voltage limit value, the instrument will stop protection, and the action time is less than 20 ms.

 3, overcurrent protection: design for high and low voltage four-fold protection, high voltage side can be accurate according to the set value;

  4. Shutdown protection: Shutdown protection will be performed when the current on the low voltage side exceeds the rated current, and the action time is less than 20ms;

 5,HNVLF programmable ultra-low frequency cable high voltage withstand test device measurement range: 0.1Hz, 0.05Hz and 0.02Hz multi-frequency selection, large test range

 6. The high voltage output protection resistor is designed in the booster body, so there is no need to connect another protection resistor outside;

  7, due to the use of high and low voltage closed-loop negative feedback control circuit, so the output has no capacitance effect. high security

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technical parameters

Parameters of HNVLF series ultra-low frequency and high voltage generator
   1. Working power supply: AC 220V± 5, 50Hz± 10%
   2. Ambient temperature: -10-40℃
   3. Relative humidity:≤ 85%
   4, output voltage: 0-30KV, 0-50KV, 0-80KV
   5. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz
   6, with load capacity: 0.1Hz output * 1.1μ F
               0.05Hz output * 2.2μ F
               0.02Hz output * 5.5μ F
   7, voltage positive, negative peak error: 3%
   8. Voltage waveform distortion: 5%

 Note: Select the product with appropriate specifications according to the test object. When using the product, the capacitance of the test object shall not exceed the rated capacity of the instrument. If the capacitance of the sample is too small, it will affect the output waveform. If it is less than 0.05uF, the instrument will not output normally. Capacitive auxiliary output of 0.1uF can be connected in parallel.
Wuhan Huaneng Lianchuang Electric Co., Ltd.