Dc high voltage generator is mainly suitable for high voltage electrical equipment of dc withstand voltage test, the insulation resistance test, the insulation products of dc withstand voltage test, cable testing is commonly used three kinds of power, because of small volume, light weight, more beautiful, convenient to work in the field, so loved by electrical workers, so the dc high voltage generator which can be used to power test?
1, insulation resistance test
Insulation resistance is the basic of the electrical equipment and circuit insulation indicators, on the dielectric dc voltage, over a period of time after the polarization process, through the leakage current of the dielectric resistance is called insulation resistance, the use of dc high voltage generator to pressure on the material being measured, the current on the material being tested don't instantly at the stable value, Instead, there is a decaying process, with a larger charging current, followed by a longer, slower decline in absorption current, and eventually a more stable conductive current. The higher the measured resistance, the longer it will take to reach equilibrium. Therefore, in order to read the measured resistance value correctly during the measurement, the value should be read after it has stabilized.
2, DC voltage and leakage test
To insulation good, under the action of dc voltage, leakage current is very small, at the same time, under the same dc voltage, by electric current of the insulation is reduced, with the extension of under the condition of the insulation is good, with the increase of applied dc voltage, due to the ion movement speed, increased leakage current, leakage current has a linear relation with the increase of the applied voltage, rise is very small.
3. Dc voltage withstand test of cable
After the test, the voltage is three times the rated voltage of the cable. Under the specified test voltage, the leakage current is recorded, and the voltage withstand of the DC high-voltage generator is checked with a high-voltage megohm meter. The use method is the conventional connection method, one phase is connected to one phase, one phase has a voltage withstand device, and the other phase is connected to the ground with two phases, and the three-phase resistance is three times.
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