How to set the test voltage of dc high voltage generator?
Generally speaking, the dc high voltage generator under the condition of meet the power frequency, the cable under 220 kv voltage class of dc withstand voltage test, but some special cases, some rating of the cable, electric voltage grade have special requirements, such as the coal industry in our country of underground cables, electrical voltage is different from the ground pressure rating, only 6 kv, so in this case, How to set the test voltage for the DC high voltage generator?
According to the regulations, different cables need different test voltage and pressurization time. Taking the XLPE cable as an example, the above 6KV cable requires a DC test voltage of 25KV and lasts for 5 minutes.
For the general test, it is necessary to slowly increase the voltage from 40% of the full test voltage to the full voltage for 5 minutes. If it is less than a year of new cable lines, the blackout is only a month. Can do 50% of the specified test voltage, lasting 1min, power failure for a year needs to be done in accordance with the general test requirements.
Specific test voltage and pressurization time requirements of different cables, as well as specific test requirements, are detailed in the power cable preventive test procedures.
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