Piezoelectric ceramic voltage dividing electronic potential transformer

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...

AI Technical Summary

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 are relatively poor, so they have relatively high requirements on the external environment and manufacturing process. At present, it is relatively difficult to form industrialized products. Promote application

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