Medium-voltage optical voltage transformer

Abstract

The invention relates to a medium-voltage optical voltage transformer which comprises an insulating device, a conductor electrode, a transformer shell, an optical voltage sensing head, optical fibers and an electric unit. The conductor electrode and the insulating device are integrally cast, a terminal used for being connected with external medium voltage is reserved at one end of the conductor electrode, the outer surface, except the terminal, of the conductor electrode is wrapped by the insulating device, the insulating device and the transformer shell are fixedly connected to form a sealed space, the sealed space corresponds to the end, exerting medium voltage, of the conductor electrode, the optical voltage sensing head is arranged at the inner bottom of the transformer shell, and the optical fibers connected with the optical voltage sensing head are led out to be connected with the electric unit outside the transformer shell. The medium-voltage optical voltage transformer can improve measuring precision, and has the advantages of being small in size, low in weight, good in insulating performance and shielding effect, flexible in application mode and high in safety.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a medium-voltage optical voltage transformer. Background technique [0002] The medium-voltage distribution network of the power system has always used medium-voltage voltage transformers (PTs) to measure the primary side voltage and provide voltage signals for metering and protection equipment. Traditional medium-voltage voltage transformers usually use electromagnetic voltage transformers, but the insulation structure of electromagnetic voltage transformers is complex, and there are inherent defects such as magnetic saturation, ferromagnetic resonance, small dynamic range, large volume and heavy weight, etc. Meet the development needs of online monitoring, high-precision fault diagnosis, computer control and management of modern power systems, especially the development of intelligent switchgear for smart grid proposed by the State Grid Corporation of China. For 10kV ~ ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems of large volume, heavy weight, high cost, poor safety and reliability, and low measurement accuracy existing in the existing medium-voltage voltage transformer, and provides a new type of medium-voltage optical voltage transformer. When the electrode and the insulating device are poured into one body to achieve external insulation, the medium voltage carried by the conductor electrode is applied to the optical voltage sensing head, which can improve the measurement accuracy. It has small size, light weight, good insulation performance, and good shielding effect. The advantages of flexible application and high security

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