Brief introduction of cable variable frequency series resonant AC withstand voltage test device

At present, there are more and more XLPE XLPE insulated power cables in the world and domestic to replace the original oil-filled paper-insulated power cables. However, the test method before the cross-linked cable was put into operation was still based on the test method of DC withstand voltage due to the large capacity of the test and the test equipment. 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 XLPE cable. The XLPE insulated cable will cause serious damage to the insulation even if it does not break through the DC test. Second, the applied DC voltage field strength distribution is different from the operating AC voltage field strength distribution. The DC test can not truly simulate the overvoltage of the cable under running conditions, and effectively find the defects of the cable and cable joint itself and the construction process. Therefore, the use of non-DC method for the voltage test of cross-linked cables has received more and more attention. For this reason, our company has developed and produced cable variable-frequency series resonant AC withstand voltage test device.