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 the leakage current during boosting. DC withstand voltage test is to determine whether the insulation material is qualified at the specified time and voltage, whether the insulation material is broken down, and whether there is any flashover phenomenon. DC high-voltage generators are widely used in power testing departments, and are important equipment in the high-voltage testing industry for conducting DC high-voltage tests on high-voltage electrical equipment such as zinc oxide lightning arresters, power cables, transformers, and generators.
Below, we will take the KST-540A DC high-voltage generator as an example to understand the factors and methods that affect the measurement results of the DC high-voltage generator.
Firstly, there are many factors that affect the measurement results of the DC high-voltage generator, such as the influence of boost speed, residual charge, and the connection position of the microammeter. This time, we will talk about some common basic factors that affect the results of the DC high-voltage transmitter.
Temperature effect
The impact of temperature on the leakage current of the DC high-voltage generator is extremely obvious. If the temperature of the equipment is too high, the leakage current will be too large. It is best to control the temperature of the test object at 30-80 ° C for testing. Within this temperature range, the leakage current changes are more obvious. It should be noted that especially in low temperature weather, if the test results differ significantly, we need to consider the impact of environmental temperature, It cannot be solely determined that the test object is faulty or damaged.
The impact of surface leakage current
If the leakage current is subdivided, it can be divided into volume leakage current and surface leakage current. The magnitude of surface leakage current depends on the impact of moisture, dirt, and other conditions on the external insulation surface of the test object. Therefore, before measuring, we try to wipe the surface of the 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 problems have been basically solved using intelligent methods through hardware and software conversion. Therefore, when using DC high-voltage generators to measure DC leakage current, we only need to see whether the final leakage current result meets the test requirements and specifications.
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