Self-adaption temperature compensating capacitor

Abstract

The invention discloses a self-adaption temperature compensating capacitor. The self-adaption temperature compensating capacitor comprises a first pole plate, a second pole plate, a dielectric medium, a grounding conductor, a compensating conductor and an insulating washer, wherein the first pole plate, the second pole plate and the grounding conductor adopt metal materials with the same thermal expansion coefficient; one end of the compensating conductor stretches into between the first pole plate and the second pole plate to block part of opposite surfaces of the first pole plate and the second pole plate, and the other end of the compensating conductor is connected with the grounding conductor; the grounding conductor and the second pole plate are mounted in an insulating mode through the insulating washer; and the thermal expansion coefficient of the compensating conductor is more than that of the first pole plate and the second pole plate. The capacitance value of the capacitor is a fixed value at any temperature, so the capacitor can automatically compensate the temperature change, namely, the capacitance value can be correspondingly changed in an adaptive manner no matter the external how temperature is changed. The self-adaption temperature compensating capacitor can be applied to various kinds of electrical equipment, in particular precise measurement equipment.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to an adaptive temperature compensation capacitor. Background technique [0002] The capacitance value of a capacitor is closely related to its structure. The materials that make up the first plate, the second plate, and the dielectric of the capacitor have their inherent temperature deformation coefficients, so when the temperature changes, the capacitance value often changes. There are many types of capacitors on the market at present. In order to obtain a capacitance value that does not change with temperature, the usual method is to use a temperature compensation capacitor with an opposite temperature coefficient to compensate the original capacitance. Although this method is feasible, it is not suitable for some precision measurement equipment ( For example, capacitor voltage transformer), in which the high-voltage arm capacitance is on the primary side, the temperature fluctuation ra...

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Problems solved by technology

There are many types of capacitors on the market at present. In order to obtain a capacitance value that does not change with temperature, the usual method is to use a temperature compensation capacitor with an opposite temperature coefficient to compensate the original capacitance. Although this method is feasible, it is not suitable for some precision measurement equipment ( For example, capacitor voltage transformer), where the high-voltage arm capacitance is on the primary side, the temperature fluctuation range is large, while the low-voltage arm capacitance is on the secondary side, the temperature fluctuation range is small, so the transformation ratio of the entire voltage divider will change with temperature , and if the high-voltage arm capacitance is compensated, the withstand voltage of the compensation capacitor must be considered, which makes the problem complicated

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