Piezoelectric ceramic voltage dividing electronic potential transformer

A technology of voltage transformers and piezoelectric ceramics, applied in the direction of inductors, piezoelectric/electrostrictive/magnetostrictive devices, transformers, etc., can solve the requirements of poor temperature stability and anti-interference, difficult to industrialize products, and manufacturing processes Compared with advanced problems, it achieves the effect of strong anti-interference ability, light weight and small volume

Inactive Publication Date: 2009-10-14
魏孝铭 +2
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Problems solved by technology

However, photoelectric transformers based on the Faraday effect cannot avoid the problem of induced linear birefringence of optical fibers, and their temperature stability and anti-interference performance ar

Method used

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  • Piezoelectric ceramic voltage dividing electronic potential transformer
  • Piezoelectric ceramic voltage dividing electronic potential transformer
  • Piezoelectric ceramic voltage dividing electronic potential transformer

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the above-mentioned drawings.

[0029] see figure 1 , the voltage divider assembly 3 described in the present invention is formed by compressing 1-4 cylindrical high-power piezoelectric ceramic sheets 1, each high-power piezoelectric ceramic sheet has the same thickness, and the thickness of the composed voltage divider assembly is It determines the power frequency withstand voltage and the ability to resist lightning interference voltage of the voltage divider components.

[0030] Piezoelectric ceramics are electronic devices with extremely low power consumption, and the dielectric loss is about 0.2%. With the change of voltage amplitude, as long as the primary circuit can provide a current not greater than 1mA, piezoelectric ceramics can work normally. It is calculated that the active power loss of the piezoelectric ceramic sheet is not more than 0.3W when it works normally. If the AC curren...

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Abstract

A high voltage potential transformer based on technologies of piezoelectric ceramics and reflective fiber optic displacement sensors is characterized by taking high-power piezoelectric ceramics as a voltage dividing assembly to be connected with a slice-type piezoelectric ceramic in series, obtaining information of primary voltage by converse piezoelectric effect of the slice-type piezoelectric ceramic, and measuring a dependent variable generated by the converse piezoelectric effect with a reflective fiber optic displacement sensor, thus completing measurement of the primary voltage. The non-contact measurement realizes passivity of the potential transformer and solves an insulation problem of the high voltage potential transformer. The high voltage potential transformer has good transient characteristics and linearity and stable temperature characteristics and causes no ferroresonance fault danger, and the product has simple insulation structure, small volume and light weight, thus greatly reducing power loss and manufacturing cost of the potential transformer at the same voltage class and achieving the aim of energy saving and exhaust emission reduction in the field of manufacturing primary equipment of the electric power system.

Description

technical field [0001] The invention relates to the application results of the new technology of piezoelectric ceramics and reflective optical fiber displacement sensor technology in the field of voltage measurement of power systems. The piezoelectric ceramic voltage dividing type voltage transformer introduced is a new type of electronic high-voltage voltage transformer. Background technique [0002] Potential transformers are widely used in power systems and are one of the necessary equipment for power plants and substations. They are used for measurement and conversion of various voltage levels, and provide reliable analog or data for normal operation and failure of the power grid. information device. [0003] At present, there are several types of voltage transformers in power systems: [0004] The first type is electromagnetic voltage transformer, which has the advantages of mature principle, good measurement accuracy and transient response characteristics. However, v...

Claims

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Application Information

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IPC IPC(8): H01F38/24H01L41/107G01R15/18G01R15/22
Inventor 魏孝铭许韦华丁建平
Owner 魏孝铭
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