Local discharge ultrahigh-frequency detection fractal antenna and preparation method thereof

Abstract

The invention discloses a local discharge ultrahigh-frequency detection fractal antenna which comprises a dielectric layer and a conductor layer, wherein the conductor layer is laid on the upper surface of the dielectric layer and comprises a plurality of squiggly conductor segments which are connected end to end; the conductor segments are arranged according to the Hilbert fourth-order fractal principle to form a fourth-order radiating antenna element; the covering surface of the conductor layer on the dielectric layer is rectangular; the side length of the covering surface is the side length of the conductor layer; and a feed point is arranged on the conductor segment. The fractal antenna which has the advantages of good directivity, wide frequency bandwidth, low standing wave ratio and convenient impedance matching, can meet the requirement on the on-line monitoring and ultrahigh-frequency detection of the local discharge of a transformer; and in addition, the invention also discloses a preparation method of the local discharge ultrahigh-frequency detection fractal antenna.

Description

technical field [0001] The invention relates to the field of fractal antenna design, in particular to a fractal antenna for partial discharge ultra-high frequency detection and a preparation method thereof. Background technique [0002] The transformer is one of the most critical equipment in the power system. Its normal operation is an important guarantee for the safe, reliable, high-quality and economical operation of the power system. It is necessary to prevent and reduce the occurrence of transformer failures and accidents to the greatest extent. However, due to the long-term operation of transformers, faults and accidents cannot be completely avoided, and there are many reasons for causing faults and accidents. In transformer faults, insulation faults account for a high proportion, and partial discharges will occur before insulation faults occur. Therefore, through online monitoring of transformer partial discharges, latent faults inside the transformer can be found in ...

AI Technical Summary

Problems solved by technology

At present, the antennas commonly used for on-line partial discharge monitoring of transformers for UHF detection mainly include Archimedes double-arm planar helical antennas, conical antennas, and dipole antennas. Practical application experience shows that the detection frequency band of existing antennas is narrow, A lot of partial discharge information is lost; the output impedance is low, which is not conducive to forming a good impedance match with the signal transmission line; the direction angle is narrow, which is not conducive to receiving weak partial discharge signals

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