PD Flexible Built-In High-Sensitivity Elliptical Monopole Antenna Sensor

Abstract

In view of the insufficient signal detection sensitivity of Gas Insulated Switchgear (GIS), partial discharge (PD), ultra-high frequency (UHF), and failure to conform with GIS surface structure when the existing rigid stereo structure UHF sensor is built in, this paper, using rectangular patch antenna equivalent technique, trapezoidal ground plane technique, and coplanar waveguide (CPW) feed line index asymptotic linearization technique, conducts research on a flexible built-in high-sensitivity elliptic monopole antenna. The flexible antenna, with a thickness of only 0.28 mm, can be kept at a voltage standing wave ratio (VSWR) of less than three in the 300 MHz to 3 GHz band under the curvature radius of 0, 100, 300, and 500 mm, and at less than two in the 650 MHz to 3 GHz band. Through the true 220 kV-GIS partial discharge experimental platform built to analyze the high frequency electromagnetic wave detection performance of the built-in flexible antenna, it is shown that the flexible built-in high-sensitivity elliptical monopole antenna designed in this paper can effectively detect the characteristic signals of high-frequency electromagnetic waves emitted by partial discharges with an average discharge amount below 10 pC.

External UHF Sensor for GIS PD Insulation Defect from Resin Hole

“…In band of 1-3 GHz, the proposed UHF sensor has higher detection sensitivity in the frequency band of 1-3 GHz, and lower detection sensitivity in the frequency band of 0.3-1 GHz. 2 The proposed UHF sensor sensitivity test experiment is carried out on 220 kV GIS experiment circuit according to IEC 60270 and GB/T 7354-2018. The experimental results show that the UHF sensor proposed in this paper can stably detect the PD electromagnetic wave signal leaking from the resin hole, and signal frequency spectrum characteristics is consistent with the sensor detection band, and the theoretical analysis of EM wave propagation characteristics from rectangular resin hole.…”

“…Therefore, it is necessary to conduct effectively on-line monitoring of the slowly developing PD (Partial Discharge) insulation defect, obtain the defect severity in advance, and repair it before the defect reaches a certain severity. At present, the methods used for on-line monitoring of GIS PD insulation defect mainly include UHF method, ultrasonic method and optical detection method, etc., [1][2][3][4]. Due to its high reliability and high sensitivity, etc., the UHF method has been widely studied and applied in the field of GIS PD insulation monitoring [5,6].…”

Experimental Study on the Compatibility of PD Flexible UHF Antenna Sensor Substrate with SF6/N2

“…For the creation of flexible, built-in GIS PD detection UHF antenna sensors, our group has developed a variety of UHF GIS PD detection antennas based on two PD flexible UHF antenna sensor substrates, namely thermosetting polyimide (PI) and polydimethylsiloxane (SU-8/PDMS). These flexible antennas have obvious advantages such as ultra-small sizes (maximum sizes of less than 60 mm), ultra-thinness (thicknesses of up to 0.2 mm), excellent radiation performances and stable performances in the bending radius deformation range of 150-500 mm [15][16][17][18].…”

An All-Fiber FLRD System for SO2 Detection Based on Graphene-Coated Microfiber

“…Partial discharge defects are one of the main causes of GIS failure, which causes SF 6 gas to decompose at high temperatures and generate symbolic decomposition products such as SO 2 . Previous studies have shown that the identification and evaluation of partial discharge defects can be achieved by analyzing information such as the type, concentration, and growth trend of the SF 6 decomposition components [3][4][5].…”