The use of a DC high-voltage generator for DC leakage testing is a comprehensive analysis of the insulation quality of the tested product based on the magnitude of the leakage current, the changes in leakage current during continuous boosting, and the stability of leakage current during boosting. The DC withstand voltage test is to determine whether the insulation material is qualified under the specified time and 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 to conduct DC high voltage tests on high-voltage electrical equipment such as zinc oxide lightning arresters, power cables, transformers, and generators. They are important equipment in the high-voltage testing industry.
Next, taking the ZC-540A DC high-voltage generator as an example, we will understand the factors and methods that affect the measurement results of the DC high-voltage generator.
There are many factors that affect the measurement results of a DC high-voltage generator, such as the boost speed, residual charge, and the position of the microampere meter. This time, we will talk about some common basic factors that affect the results of a DC high-voltage transmitter.
1. Temperature influence
The influence of temperature on the leakage current of DC high-voltage generators is extremely significant. If the temperature of the equipment is too high, the leakage current will be biased. It is best to control the temperature of the test sample at 30-80 ° C for testing. The leakage current changes significantly within this temperature range. It should be noted that, especially in low-temperature weather, if the test results differ too much, we need to consider the influence of environmental temperature and cannot simply judge the fault or damage of the test sample.
2. The impact of surface leakage current
If the leakage current is subdivided, it can be divided into volumetric leakage current and surface leakage current. The magnitude of surface leakage current depends on the influence of moisture, pollution, and other conditions on the outer insulation surface of the test sample. Therefore, before measurement, we try to wipe the surface of the test sample clean as much as possible, and if necessary, dry it or connect a shielding ring to effectively avoid excessive leakage current.
The above are the factors and basic methods that affect the measurement results of DC high-voltage generators. However, with the advancement of domestic and international technical capabilities in related fields, many detailed issues have been handled in an intelligent way through hardware and software conversion. Therefore, when using DC high-voltage generators to measure DC leakage current, we only need to check whether the final leakage current result meets the test requirements and specifications.
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