A dynamic sealing structure of a high-vacuum solid insulating surface charge measuring device
A technology of dynamic sealing structure and solid insulation, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as difficulty in implementation, and achieve the effects of improved charge measurement accuracy, high movement accuracy, and high vacuum degree
Active Publication Date: 2017-08-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
In order to ensure the measurement resolution, the capacitance value of the probe itself and the entrance capacitance value of the test line in the dynamic capacitance probe method are required to be extremely stable, which is difficult to achieve
In addition, this method is not suitable for the measurement of insulators with complex shapes
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Embodiment Construction
[0016] The invention proposes a dynamic sealing structure of a high-vacuum solid insulating surface charge measuring device, which will be described below in conjunction with the accompanying drawings.
[0017] figure 1 Shown is a schematic diagram of the dynamic seal structure of the high-vacuum solid insulating surface charge measurement device. In the figure, the high vacuum solid insulating surface charge measuring device is composed of a static capacitance probe bracket, a static capacitance probe rotation control mechanism, a static capacitance probe swing control mechanism and a high vacuum dynamic sealing system; the high vacuum solid insulating surface charge measuring device The dynamic sealing structure is realized by the magnetic fluid high vacuum dynamic sealing technology, and the two rotating motions are introduced into the vacuum test chamber without destroying the vacuum degree of the vacuum test chamber, and the vacuum degree of the vacuum test chamber is kep...
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The invention belongs to the technical field of static measuring in electro-technical measurement, and discloses a dynamic sealing structure for a high vacuum solid insulation surface charge measuring device. The high vacuum solid insulation surface charge measuring device is composed of a static capacity probe stand, a static capacity probe rotating manipulating mechanism, a static capacity probe swing control mechanism and a high vacuum dynamic sealing system. The magnetic fluid high vacuum dynamic sealing technology is adopted, under a condition that the vacuum degree of a vacuum testing cavity is not damaged, two rotating motions are introduced into the vacuum testing cavity, a high vacuum testing environment in the testing cavity is not influenced, and the vacuum degree of the vacuum testing cavity is maintained in the magnitude ranging from 10 Pa to 5 Pa. It is achieved that a static capacity probe is controlled to rotate around a solid insulation test object to carry out scanning, and surface charge measuring is carried out. When high voltage is applied, the static capacity probe is driven to move away from the solid insulation test object and a high voltage electrode, and the safety of a weak current system of the static capacity probe and testers during testing is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of electrostatic measurement in electrical measurement, and in particular relates to a dynamic sealing structure of a high-vacuum solid insulating surface charge measuring device. Background technique [0002] The interface between vacuum and solid insulation is the weakest link of the entire insulation system. The surface charge accumulation at the vacuum-solid insulation interface will change the electric field distribution of the insulation system, and then affect the creepage withstand voltage level of the insulation system. Therefore, the measurement of the surface charge of vacuum solid insulation is of great significance. [0003] The measurement of surface charge belongs to the category of electrostatic measurement, so it cannot be measured with common electrical instruments. The measurement methods of surface charge mainly include: dust method, electroacoustic pulse method, ultrasonic method, Pock...
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IPC IPC(8): G01R29/24
Inventor 齐波孙泽来高春嘉李成榕
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)