Broadband dual circularly polarized antenna for detection of partial discharge of switchgear, and designing method thereof

Abstract

The invention discloses a broadband dual circularly polarized antenna for detection of partial discharge of a switchgear, and a designing method thereof. The antenna comprises a wire layer, a medium substrate and an antenna housing. Laid on the medium substrate, the wire layer is composed of first to Nth conductor arms on a planar surface, wherein N is 2 or 4. Each conductor arm is rotational symmetric, with a contour line being a three-period fundamental sinusoid. The medium substrate is placed inside the antenna housing. The designing method comprises the following steps of: determining antenna parameters; determining the contour line of the first conductor arm; and determining the contour lines of the second to Nth conductor arms. According to the invention, the three-period fundamental sinusoid is adopted as the contour line of the dual circularly polarized antenna, thereby extending the effective electrical length and enhancing the effect of partial discharge detection. The broadband dual circularly polarized antenna of the invention achieves multiple detection frequency bands within the range of 0.3-3 GHz, which means relatively wide frequency bands. Moderate in size and low in cost, the broadband dual circularly polarized antenna is convenient to carry and is suitable to be used on a switchgear of a conventional electrical power system.

Description

technical field [0001] The invention relates to a broadband dual-circular polarization antenna and a design method thereof, in particular to a broadband dual-circular polarization antenna for detecting partial discharge of a switch cabinet and a design method thereof, belonging to the technical field of switches. technical background [0002] High-voltage metal-enclosed switchgear has been widely used in substations, and its operation safety directly affects the reliability of power supply in substations and the production and life of the people. Therefore, it is very necessary to monitor and predict the operating status of switchgears and make reasonable maintenance. The high-voltage switchgear is under the action of high temperature, high voltage, vibration, humidity, etc. for a long time, and at the same time, with potential defects in the manufacturing process, etc., the metal parts inside the high-voltage switchgear may generate partial discharge, resulting in a decrease...

AI Technical Summary

Problems solved by technology

When the existing antenna detects the partial discharge of the switch cabinet, it brings great inconvenience to the detection of the partial discharge of the switch cabinet due to defects such as narrow detection frequency band, large volume, and poor anti-interference performance during use.

Moreover, when the microstrip antenna is used to detect the partial discharge of the switchgear, when detecting low-frequency signals, there is a high requirement for the patch area of ​​the microstrip antenna, which makes it very difficult to realize.

With the advancement of antenna technology, fractal antennas continue to become popular, but fractal antennas have narrow fundamental / low-order harmonic bandwidth, relatively fixed adjacent frequencies, slightly lower fundamental harmonic gain, slightly lower polarization purity, and fractal curve bends. Distortion makes the direction of the current inconsistent everywhere, so the directionality of the electric field becomes poor, so that the fractal antenna cannot be widely used

Archimedes spiral antenna has a great prospect in the detection of partial discharge, but it is mainly used for partial discharge detection in GIS, and its application in switchgear is relatively seldom

Many UHF sensors that have been designed so far cannot have a wide frequency band and a small volume, which brings great inconvenience to the detection of partial discharge in switchgear

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