At present, there are more and more XLPE insulated power cables in the world and domestic to replace the original oil-filled paper-insulated power cables. However, due to the large capacity of the test and the test equipment, the test method of DC withstand voltage has been followed for a long time.
In recent years, the research results of many international and domestic research institutions have shown that DC test has different degrees of damage to XLPE cable.
The use of non-DC methods for the withstand voltage test of cross-linked cables has received increasing attention.
At present, the ultra-low frequency power supply (VLF) has been used in the medium and low voltage cables for the withstand voltage test.
However, due to the low voltage level of such VLF, it cannot be used for high voltage cable tests of 110kV and above.
In China, this method has also been used for low-voltage cables, but due to the test equipment, it has not been widely promoted.
In recent years, due to the construction of urban and rural power grids, there are more and more XLPE cross-linked cables.
The cables are put into operation only after the DC withstand voltage test, and the cable or cable head breakdown occurs under the operating voltage.
It also happens from time to time. Therefore, everyone is exploring new test methods.
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