Miniaturized built-in flexible antenna sensor for partial discharge detection in power equipment

Abstract

The invention belongs to the technical field of antennas, and discloses a miniaturized built-in flexible antenna sensor for partial discharge detection of power equipment. In the present invention, both the Archimedes planar spiral antenna and the exponentially changing high-gap ratio balun are arranged above the flexible substrate, and the two are coplanar, and the coaxial joint is arranged below the flexible substrate; the exponentially changing high-gap ratio The beginning of the balun is connected to the coaxial joint, and the end is connected to the beginning of the Archimedes planar spiral antenna; the exponentially changing high-gap ratio balun is a double-arm structure, and the gap ratio is gradually changed in the form of an exponentially changing line. The maximum value is greater than or equal to 5; the miniaturized built-in flexible antenna sensor is used to couple electromagnetic wave signals in the UHF band radiated by partial discharge of electrical equipment. The invention reduces the impedance through the exponentially changing high-gap ratio balun, expands the application range, realizes axial miniaturization through the coplanarity of the balun and the antenna body, and adopts a flexible substrate to realize conformality with the complex internal structure of the electrical equipment.

Description

technical field [0001] The invention belongs to the technical field of antennas, and more specifically relates to a miniaturized built-in flexible antenna sensor for partial discharge detection of power equipment. Background technique [0002] Partial discharge is a discharge phenomenon that occurs in a local area of ​​power equipment under the action of a sufficiently strong electric field. Long-term partial discharge will cause a sharp drop in the insulation strength of the insulation system, which is also an important factor that damages the insulation of high-voltage power equipment. In the process of partial discharge, a pulse current with a rise time of less than 1ns will be generated, the breakdown process is fast, and electromagnetic waves of several GHz can be excited. The UHF detection method has the advantages of strong anti-interference ability and high stability, and is widely used in the field of partial discharge monitoring. [0003] The key to the UHF detect...

AI Technical Summary

Problems solved by technology

At present, the built-in spiral sensors used in the field of partial discharge detection are all rigid substrates, which cannot be integrated with the complex internal structures of electrical equipment during installation (for example, arc-shaped gas-insulated fully enclosed combined electrical appliances GIS, arc-shaped bushings, arc-shaped electric Transformers, etc.) conformal problems, resulting in the need to change the structure of electrical equipment when the antenna is built-in

In addition, since the antenna is made of copper, there is a danger of destroying the electromagnetic balance inside the device after the rigid antenna penetrates into the electrical device

The effective operation of the helical antenna requires the design of the balun to achieve balanced feeding and impedance matching. The existence of the rigid base balun increases the profile height of the helical antenna, which reduces the space utilization during installation, which is not conducive to practical application

[0004] At present, the research on flexible antennas at home and abroad is mostly concentrated in the field of communication and wearable devices, such as flexible antennas for wear and communication, and the research is still in its infancy. The electromagnetic wave frequency band detected by flexible antennas is higher than 3GHz, which cannot be used in existing There is a flexible antenna for the detection of electromagnetic wave signals in the UHF (300MHz~3GHz) frequency band of partial discharge points of power equipment

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