GIS hand hole internal noise active reconstruction system and method based on waveguide diffusion effect

Abstract

The invention provides an active reconstruction system and method for noise in a GIS hand hole based on a waveguide diffusion effect. The method comprises the following steps: annularly arranging a plurality of miniature antenna transmitters in the hand hole; the field intensity is enhanced by utilizing waveguide diffusion of the metal cavity; a standard built-in ultrahigh frequency sensor is used in the GIS hand hole; injecting the acquired noise into k micro antennas; the signals are ensured to be superposed in the hand hole cavity through propagation time delay compensation; and the micro antenna group outputs an equivalent noise signal s (t). According to the method, Gaussian pulse synthesis and time delay control are combined, and low-power equivalent high-field-intensity noise reconstruction is achieved.

Description

Technical Field

[0001] This invention relates to the field of power equipment condition monitoring technology, specifically to a double-layer circularly polarized radiation method and apparatus for equivalent reproduction of noise inside GIS manholes, applicable to the performance verification of UHF sensors on insulator surfaces. Background Technology

[0002] Gas-insulated switchgear (GIS) requires calibration of its built-in UHF sensor before commissioning to ensure the reliability of partial discharge detection. Traditional calibration methods face two major challenges:

[0003] 1. Uncompensated metal cavity effect: The GIS handhole is a closed metal cavity, and multiple reflections of electromagnetic waves cause distortion in the field strength distribution. The existing model does not consider this effect.

[0004] 2. Miniaturization versus efficiency: When traditional antennas are reduced in size, their gain drops sharply, failing to meet field strength requirements.

[0005] This invention compensates for cavity effects through a waveguide diffusion model and combines it with a miniaturized helical antenna design to achieve accurate reconstruction of high field strength noise under low power input. Summary of the Invention

[0006] This invention provides an active reconstruction system and method for noise inside GIS handholes based on waveguide diffusion effect, in order to solve the problem of inaccurate reproduction of surface noise inside GIS handholes.

[0007] Firstly, a method for reproducing surface noise inside a GIS handhole is provided, including:

[0008] The antenna excitation signal is calculated based on the noise collected on site.

[0009] Control the antenna output to reproduce the noise signal.

[0010] In a second aspect, a computer-readable storage medium is provided, wherein computer program instructions are stored thereon; when executed by a processor, the computer program instructions implement the reproduction of surface noise inside the GIS handhole as described in the first aspect embodiment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a system framework diagram of Embodiment 1 of the present invention;

[0013] Figure 2 This is a top view of the GIS handhole internal surface noise reproduction system according to Embodiment 1 of the present invention;

[0014] Figure 3 This is a side view of the GIS handhole internal surface noise reproduction system according to Embodiment 1 of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1

[0017] Reproduce the internal noise of a 220kV GIS handhole. The GIS handhole has a diameter of 8cm and a depth of 15cm, and the antenna operates in the 300MHz-3GHz frequency band. The implementation steps are as follows:

[0018] S1: Antenna Installation

[0019] Six miniature helical antennas, each 5 cm in diameter, are used, arranged as follows: Figure 1 As shown, it is arranged on the inner wall of the inner ring of the circular hand hole.

[0020] S2: Parameter Calculation

[0021] The signal generation parameters are calculated, including the cavity cutoff frequency. Attenuation coefficient Wavenumber β = 2πf / c = 16.76 rad / m S3: Output noise analog signal

[0022] The obtained Gaussian pulse sequence is output to the helical antenna end, and ultra-high frequency electromagnetic noise is obtained through antenna excitation, thereby realizing the reproduction of the ultra-high frequency electromagnetic noise inside the GIS handhole.

[0023] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0024] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A system and method for active reconstruction of noise within a GIS handhole based on waveguide diffusion effect, characterized in that... Includes the following steps: S1: N miniature spiral antennas are deployed at the appropriate locations within the GIS handhole cavity, with the antenna spacing satisfying the following: Where f max =3GHz, λ min =0.1m; S2: The noise field is generated by the superposition of N antennas, and the formula for the noise field strength is: Where A i Let be the complex excitation coefficient of the i-th antenna element. This refers to the waveguide diffusion effect in a metallic cavity. Wave number, representing the rate of change of spatial phase. To attenuate electromagnetic waves in SF6 gas, To compensate for transmission delay, For wave speed, ε in SF6 r ≈1.002; S3: Based on the noise field strength synthesis formula, generate a time-domain Gaussian pulse sequence to drive the antenna array: Where a k Let t be the amplitude of the k-th Gaussian pulse. k Let τ be the time center of the k-th Gaussian pulse. k Let be the time width parameter of the k-th Gaussian pulse.

2. The method according to claim 1, characterized in that: The waveguide diffusion term in For wave number, f is the attenuation coefficient. c The cutoff frequency of the cavity is determined by the size of the handhole.

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