The DC leakage test using a DC High Voltage Generator is a comprehensive analysis of the insulation quality of the product under test by the size of the leakage current, the change of the leakage current during continuous boosting, and the stability of the leakage current during boosting.
The test voltage reaches the rated value. The DC withstand voltage test is to determine whether the insulation material is qualified at the specified time and specified voltage, whether the insulation material is broken down, and whether there is flashover phenomenon.
DC High Voltage Generators are widely used in power testing departments. Carry out DC high-voltage tests on high-voltage electrical equipment such as zinc oxide arresters, power cables, transformers, generators, etc. It is an important equipment in the high-voltage testing industry. However, some factors affect the accuracy of the test values. There are many factors that affect the measurement results of DC High Voltage Generators.
Here are a few important examples:
1. Temperature affects the measurement results of DC high-voltage generator. If the temperature is too high, the leakage current will be too large. When the temperature of the test product is controlled at 30-80 °C, the test result is better.
The leakage current variation is more pronounced over this temperature range. It should be reminded that especially in low temperature weather, if the test results are too serious, the influence of ambient temperature needs to be considered, and it is not just a judgment that the test fails or damages the product.
2. The influence of surface leakage current In fact, if the leakage current is subdivided, it can be divided into volume leakage current and surface leakage current. The magnitude of the surface leakage current depends on the influence of moisture on the outer insulating surface of the test product.
Cleaning the surface of the product, drying it if necessary, or connecting a shielding ring can effectively avoid excessive leakage current. In addition, the DC leakage test using a DC high-voltage generator is a comprehensive analysis of the measured object by the size of the leakage current, the change of the leakage current during the continuous boost process, and the stability of the leakage current during the test. The voltage reaches the rated value. The insulation of the product is good or bad.
The high-voltage test itself is a destructive test, but this test can find defects that cannot be found in non-destructive testing, especially when the insulation has tiny bubbles and does not penetrate defects.
The disadvantage is that it will cause certain damage to the insulation during the test. This requires that the output test voltage be applied to different test objects in strict accordance with the requirements in the regulations.
The DC withstand voltage test is to determine whether the insulation material is qualified at the specified time and specified voltage, whether the insulation material is broken down, and whether there is flashover phenomenon.
The high-voltage test itself is a destructive test, but this test can find defects that cannot be found in non-destructive testing, especially when the insulation has tiny bubbles and does not penetrate defects. The disadvantage is that it will cause certain damage to the insulation during the test. This requires that the output test voltage be applied to different test objects in strict accordance with the requirements in the regulations.