Cable in the cable and cable accessories installed after the completion of the DC voltage test should be [preventive test]. And the experimental data were compared and analyzed. Which can be compared with the experimental data of the same cable, and can be compared with the historical data of this cable to explore the law of experimental data. If you do the DC voltage test, the measured leakage current value has one of the following circumstances, the cable insulation may be defective, reflecting the defect site, and be treated:
　　(1) rises rapidly as the test voltage increases or the pressure time increases
　　(2) Compared with the same cable, the value increases more
　　(3) and the cable before the measured data showed a significant upward trend
　　(4) the leakage current between the three phases is large.
　　cable
　　The above situation should be carefully analyzed, such as non-test methods caused by improper income, may be appropriate to improve the experimental voltage or extend the test time to determine whether the cable to meet the conditions of continuous operation.