Standard capacitor installed by separated type coaxial structure

Abstract

The invention provides a standard capacitor installed by a separated type coaxial structure. The standard capacitor is characterized in that the standard capacitor comprises a bottom plate, a casing component, an electrode component, a high voltage bushing, a conducting rod and a grading ring, the electrode component comprises an electrode fixing platform, a supporting insulator, a high voltage electrode, a low voltage electrode and a shield component, the casing component and the electrode fixing platform are installed at the center of the bottom plate, the low voltage electrode and shield component are fixed on a flange of the electrode fixing platform, the supporting insulator is disposed at the center of a base plate of the electrode fixing platform, the high voltage electrode is mounted at the center of the supporting insulator, and the high voltage bushing is installed at the center of the casing component. According to the standard capacitor installed by the separated type coaxial structure, the separated type structure is utilized, the low voltage electrode and the shield component are separated from a barrel wall, the change of capacitance caused by the deformation of the barrel wall is avoided, temperature coefficient and pressure coefficient are reduced, simultaneously, each part on the installing platform is positioned and processed along a central axis, the coaxiality of high and low voltage electrode assembly can be effectively guaranteed, and the voltage coefficient is reduced.

Description

technical field [0001] The invention relates to a standard capacitor installed with a split coaxial structure, belongs to the technical field of electric power test equipment, and is particularly suitable for the high-voltage precision measurement field of laboratories and field tests. Background technique [0002] Standard capacitors can be used for testing and verification of high-voltage equipment, and are a necessary standard equipment in high-voltage laboratories. At present, the overall structure of standard capacitors is mostly an inverted structure, that is, the high and low voltage electrodes are at the upper end of the whole device. This kind of standard capacitor has a simple structure and is easy to realize. However, due to the concentration of voltage on the top of the device, the distortion of the field strength outside the insulating cylinder is serious, and the field strength distribution is difficult to adjust, so many high-voltage capacitors have to step do...

AI Technical Summary

Problems solved by technology

[0003] However, in the vertical structure, the structure of the high and low voltage electrodes, shielding components and their installation and fixing are more complicated, and the coaxiality of the high and low voltage electrodes is difficult to guarantee, resulting in relatively large parameters such as voltage coefficient, temperature coefficient, and pressure coefficient of the capacitor, which affect its performance.

For example, in the excellent master's thesis "Development of 1200kV UHV Vertical Standard Capacitor" retrieved from CNKI, the vertical standard capacitor is to fix the low-voltage electrodes and shielding components on the outer casing through 8 fixing parts. The installation structure is difficult to control due to the machining accuracy of the cylinder wall, and the installation is complicated. Human errors will be introduced during the installation process, and it is difficult to ensure the coaxiality of the high and low voltage electrodes.

In addition, both inflation and temperature rise will cause the deformation of the cylinder wall, which will drive the low-voltage electrodes and shielding components to cause capacitance changes, resulting in unstable performance of the capacitor

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