In an ideal variable high-voltage capacitor, when the moving piece is fixed in a certain position, the whole working timeHigh voltage capacitorsThe capacitance at this position should be fixed, but in fact, due to the influence of external factors, its capacitance still changes.
The degree of variation is the stability of the capacitor, which depends on the structure of the capacitor, the materials used, and the quality of the manufacture.
1. The influence of high-voltage capacitors on mechanical action When the high-voltage capacitor is subjected to vibration or bumps, the capacitance of the high-voltage capacitor will change, and the change value depends on the distance between the capacitor poles and the geometric size and the mechanical strength of the whole structure.
The larger the sheet spacing, the smaller the size, and the thicker the thickness, the smaller the amplitude and the smaller the change in capacitance.
In order to reduce and eliminate the effects of mechanical action, electrodes made of inelastic materials can be used, the thickness of the pieces can be increased, the distance between the pieces can be increased, and the entire structure of the capacitor can be reinforced.
For example, under the influence of mechanical load, due to the loosening of rivets, bending of the bracket, etc., the moving piece group may produce angular displacement (i.e., rotation), and a locking device can be installed on the capacitor.
In addition, the capacitance stability of high-voltage capacitors is also affected by conditions such as humidity and atmospheric pressure.
2. High-voltage capacitors are also affected by temperatureWhen the temperature changes, the electrode area, thickness, distance between pieces and dielectric constant of the variable high-voltage capacitor will change.
When there is a significant change in temperature, the structural parts of the capacitor will also be deformed, and all these changes will change the quality of the capacitor, so the capacitance temperature coefficient of the variable capacitor is determined by the combined action of these factors.
In order to reduce the influence of temperature, you can start from these three aspects:
1).It is to choose a material with a small coefficient of linear expansion.
2).It is to adopt reasonable processing technology.
The direction of ion migration in the process of oxide film growth of capacitors is such as heat treatment of punched or turned electrode pieces, and the assembled and adjusted capacitors are subjected to a certain temperature aging to eliminate internal stress and improve stability.
3).Improve the accuracy of capacitor pole assembly, and try to ensure that the piece distance is uniform.
The capacitance of a high-voltage capacitor is susceptible to temperature, and the higher the voltage, the higher the temperatureA high or low frequency can also cause the capacitor to be resistive, which can lead to an increase in temperature.
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Zhejiang Yishuo Electric Co., Ltd. is a high-tech company specializing in R&D, design, production, sales and service of low-voltage power capacitors, smart capacitors, reactors, reactive power compensation controllers, and reactive power compensation devices.
The company adheres to the tenet of "taking science and technology as the driving force and seeking development by quality", and is committed to building a leading brand of smart grid professional services. The company adheres to the tenet of "taking science and technology as the driving force and seeking development by quality", and is committed to building a leading brand of smart grid professional services.
The company has a high-level R&D management team, integrating R&D, production, sales and service, focusing on intelligent reactive power compensation, harmonic control, energy saving and power quality management and other high-tech industries of power automation.
Over the years, we have adhered to the mission of "making products intelligent and services intimate". In line with a high sense of responsibility to the society and users, Yishuo Electric adheres to the road of specialization, continues to innovate and transcend, and strives to make greater contributions to China's smart grid power automation