The full polarity conversion of DC high voltage generator involves a series of processes such as generator voltage reduction, grounding, silicon polarity switch, grounding and voltage boost. Each step of the polarity conversion process takes a great deal of time. In order to shorten the polarity switching time of dc high voltage generator and realize fast polarity switching, it is necessary to shorten the time of each process.
(1) in the decompression process to speed up the step down is one aspect of shortening the polarity switch, mainly by increasing the discharge resistance to speed up the step-down, increase the total resistance discharge resistance does not increase the discharge resistance, but increase with the voltage divider in parallel with the same resistance value of resistance, the number of column number is larger, the smaller the total resistance, the faster the step-down, at the same time, The lower limit of discharge resistance should be considered, because too small a discharge resistance will inevitably lead to an increase in leakage current during normal operation of the device.
(2) Grounding switch in the grounding process, the test voltage grounding to zero or zero value needs a long time. When the dc high voltage generator voltage drops from the test value to a certain level, the direct grounding of the quick grounding switch can greatly shorten the grounding process of the grounding switch, however, to meet the requirements of the high voltage fast grounding switch can withstand all the high voltage and high current, which is extremely harsh for the quick grounding switch.
(3) In simple terms, the silicon reactor needs to achieve rapid polarity conversion to achieve the internal single tube polarity conversion. To achieve this goal, we must first consider motivation. At present, there are three kinds of simple power, driven by electric, pneumatic and hydraulic mode. 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 the air source compression ratio used by the cylinder. If all silicon reactor through the trachea in series, when humidity is high, in the gas from trachea, the whole equipment will cause damage to the equipment and so forth, hydraulic method using vacuum treatment of alkyl benzene insulating oil does not lead to emissions, secondly, the compression ratio of the oil is much less than the compression ratio of the gas, can realize smooth silicon reactor polar transformation, to avoid the problem of the other two methods, In contrast, it can be seen that the hydraulic selection method is reasonable.
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