DC High Voltage Generatoradopts a unique integrated cabinet structure, placing the voltage doubling cylinder and the operation box in one cabinet, which completely solves the contradiction between the inconvenience of carrying the split-type machine and the safety and reliability of the integrated machine's high voltage. When in use, the voltage doubling part and the control box can be separated, which is convenient to carry and safe and reliable, greatly reducing the volume and weight. It has all the functions, technical features and indicators of the ZGF series DC high voltage tester, realizing a one-hand portable whole machine.
The main function of the DC high voltage generator is used by the power maintenance departments in enterprises such as electric power maintenance departments, industrial and mining, steel, metallurgy, and shipping to conduct DC withstand voltage tests on high-voltage electrical equipment such as power cables, generators, zinc oxide arresters, high-voltage switches, and transformers.
The DC high voltage generator is a precise electrical measuring instrument. If used improperly, it will not only affect the measurement accuracy of the instrument, but may also shorten its service life. Therefore, when beginners operate the DC high voltage generator, they must pay attention to the following 6 points:
1. No matter which manufacturer's equipment you purchase, before use, you should first read the instruction manual to understand the working principle and operation process of the equipment;
2. Install two obvious disconnection points before the working power enters the tester. When replacing the test object and wiring, the working power disconnection point should be clearly disconnected first;
3. Before the test, check whether the grounding wires of the DC high voltage generator control box, voltage doubling cylinder, and the test object are properly connected. The test circuit grounding wire should be grounded at one point as shown in the instruction manual;
4. For discharging large capacitive test objects, use a 100Ω/V discharge resistor rod to discharge the test object. When discharging, do not immediately contact the test object with the discharge rod. Instead, gradually approach the test object with the discharge rod. When the air gap begins to ionize and discharge with a hissing sound, and when there is no sound, you can use the grounding end of the discharge rod to discharge, and finally directly connect the grounding wire for discharge;
5. When the DC high voltage is 200KV and above, even if the test personnel wear insulating shoes and are in an area outside the safe distance, due to the influence of the high-voltage DC ion space electric field distribution, several nearby standing bodies may carry different DC potentials. Test personnel should not shake hands with each other or touch grounding points with their hands, otherwise there may be a slight electric shock phenomenon. This phenomenon is more obvious in dry areas and winter, but because the energy is small, it generally does not cause harm to people;
6. After the test, the grounding wire must be hung on the high-voltage output terminal before removing the high-voltage lead.
Of course, in actual operation, we may encounter various situations. Therefore, after a unit or enterprise newly purchases a DC high voltage generator, it must require the supplier to provide technical training. This is to ensure the personal safety of the operators and also to allow the equipment to be put into use as soon as possible.
The DC high voltage generator is a common DC withstand voltage device in power preventive test equipment. Earlier, the DC high voltage generator could be used for DC withstand voltage tests on power cables to check the insulation performance of cables. However, with the research on power preventive tests, it has been found that checking insulation performance under DC conditions is not perfect. Compared with AC withstand voltage equipment such as series resonance test devices, the DC high voltage generator actually causes greater hidden damage to cables. Gradually, the scope of use of the DC high voltage generator has been limited to a certain extent. At present, the DC high voltage generator is mainly used to measure the leakage current of zinc oxide arresters or to serve as a DC power source.
