Abstract
10 kV cables may have holes caused by making main insulation and installing terminations, which threatens the safe operation of cables. This paper makes a cable termination with a hole, the electric field distribution is simulated to study the law of electric field with the holes' axial position. A high-frequency current transformer is used to measure partial discharge on termination with a hole. The results show that the holes' axial position has a great influence on the termination electric field. If the hole does not exceed the fracture of the insulation shielding, the maximum electric field strength amplitude does not change much. If the hole exceeds the fracture of the insulation shielding, the maximum electric field strength decreases significantly as the distance away from the fracture. When the hole is located in the fracture of the insulation shielding, its maximum field strength amplitude reaches the maximum. In this paper, two partial discharge tests are carried out on the termination where the hole exceeds 6 mm of the fracture, and we compared the results of the two tests. It is found that there are certain differences in the value of partial discharge change rule and phase change rule between the two discharges.
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