The DC leakage test using a DC high voltage generator is to comprehensively analyze the insulation quality of the tested product through the magnitude of the leakage current, the change of the leakage current during the continuous boosting process, and the stability of the leakage current when the test voltage reaches the rated value. . The DC withstand voltage test is to judge whether the insulating material is qualified or not under the specified time and specified voltage, and the insulating material is not broken down and whether there is flashover.
HV Hipot GDZG-300 Series DC High Voltage Generator
DC high voltage generators are widely used in power testing departments. Conduct DC high voltage tests on high voltage electrical equipment such as zinc oxide arresters, power cables, transformers, and generators. It is an important equipment for high-voltage testing profession. However, some factors will affect the accuracy of the test values. There are many factors that affect the measurement results of the DC high-voltage generator.
The following are several important examples:
1. Temperature affects the measurement results of the 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, the test result is better. The leakage current changes more obviously in this temperature range. I need to remind that, especially in low temperature weather, if the test result is The out-of-tolerance is too serious, we need to consider the influence of the ambient temperature, and we cannot just judge the failure or damage of the test product.
2. 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 size of the surface leakage current depends on the influence of moisture on the outer insulating surface of the test product. Clean the surface of the product, dry it if necessary, or connect a shielding ring, which can effectively avoid excessive leakage current. In addition, the DC leakage test using a DC high voltage generator is to comprehensively analyze the tested subject through the magnitude of the leakage current, the change of the leakage current during the continuous boosting process, and the stability of the leakage current when the test voltage reaches the rated value. The insulation of the product is good or bad. The DC withstand voltage test is to judge whether the insulating material is qualified or not under the specified time and specified voltage, and the insulating material is not broken down and whether there is flashover.
The high-voltage test itself is a destructive test, but this test can find defects that cannot be found in non-destructive tests, especially when there are tiny bubbles and non-penetrating defects in the insulation. The disadvantage is that it will cause certain damage to the insulation during the test. This requires the output test voltage to be applied to different test objects in strict accordance with the requirements in the regulations.
The DC withstand voltage test is to judge whether the insulating material is qualified or not under the specified time and specified voltage, and the insulating material is not broken down and whether there is flashover. The high-voltage test itself is a destructive test, but this test can find defects that cannot be found in non-destructive tests, especially when there are tiny bubbles and non-penetrating defects in the insulation. The disadvantage is that it will cause certain damage to the insulation during the test. This requires the output test voltage to be applied to different test objects in strict accordance with the requirements in the regulations.
Post time: Apr-20-2022