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What are the methods to improve the testing efficiency of DC high-voltage generators?

:2023-11-22 16:18:13:

DC high-voltage generator can be abbreviated as DC generator, DC generator, high-voltage generator, high-voltage DC generator, etc. It adopts new technologies, materials, and devices currently available, and its main performance features include high output power, small volume, light weight, and easy portability.

With the large-scale deployment of DC transmission projects, the number and frequency of DC high-voltage generators have greatly increased. In order to improve the efficiency of DC high-voltage generators, it is necessary to improve the speed of polarity conversion.

The full polarity conversion of a DC high-voltage generator involves a series of processes such as generator voltage reduction, grounding, silicon pile polarity switch, grounding, and boosting. Each step of the polarity conversion process requires a significant amount of time. In order to shorten the polarity switching time of the DC high-voltage generator and achieve fast polarity switching, it is necessary to shorten the time of each process.

Three major methods for fast polarity conversion of DC high-voltage generators:

1. Accelerating the voltage reduction speed during the voltage reduction process is one aspect of shortening polarity switching, mainly by increasing the discharge resistance to accelerate the voltage reduction speed. Increasing the discharge resistance does not increase the total resistance of the discharge resistance, but rather increases the number of resistors with the same resistance value in parallel with the voltage divider. The larger the number of columns, the smaller the total resistance, and the faster the voltage reduction speed. At the same time, the lower limit of the discharge resistance should be considered, because, A too small discharge resistance will inevitably lead to an increase in leakage current during normal operation of the device.

2. During the grounding process of the grounding switch, it takes a long time for the test voltage to ground to zero or zero. When the voltage of the DC high-voltage generator drops from the test value to a certain level, a direct grounding fast grounding switch can greatly shorten the grounding process of the grounding switch. However, a fast grounding switch that meets the high voltage requirements can withstand all high voltages and large currents, which is extremely demanding for fast grounding switches.

3. Simply put, silicon stacks need to achieve fast polarity conversion to achieve internal single transistor polarity conversion. In order to achieve this goal, we must first consider motivation. At present, there are three simple types of power, which are driven by electric, pneumatic, and hydraulic methods. According to the structural characteristics of the DC high-voltage generator, it is impossible to achieve power supply under high voltage. The pneumatic device has a compression ratio of the air source used for the cylinder. If all silicon reactors are connected in series through gas tubes, when the humidity in the gas is high, the entire equipment will be discharged from the gas tube, causing equipment damage, etc. The use of vacuum treated alkylbenzene insulation oil in hydraulic methods will not cause emissions. Secondly, the compression ratio of the oil is much smaller than that of the gas, which can achieve smooth polarity conversion of the silicon reactor and avoid the problems of the other two methods, It can be seen that the hydraulic selection method is reasonable.

The above are the three main methods for fast polarity conversion of DC high-voltage generators, hoping to be helpful to everyone!


ZC-540A DC high voltage generator is suitable for electric power, railway, chemical industry, mining, metallurgy, iron and steel and other departments of zinc oxide surge arrester, magnetic arrester, power cable, transformer, generator and other equipment for DC voltage test and leakage test, can also be used for electrostatic dust, spray and other power.

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