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Static Field Sensing: Moisture Sensing in Concrete using Interdigitated Sensors

Upasana Sinha, Saksham Garg

Abstract


Throughout this article, we examined second, sub-wavelength dimension non-intrusive wave launchers built and tested that can fire TDR or JTFDR style broadband waveforms in VHF-UHF bands to detect cable faults. More than 3:1 transmitting bandwidth (100–300 MHz) is accomplished with a cylindrical launcher on a square orthogonal ground plane whereas more than an octave (100–240 MHz) range is accomplished with a CSW launcher. Accessible circuit faults are observed by surface waves and TDR on two XLPE cables. Third, a modern mathematical approach is developed that can be used to calculate the variations in the dielectric constant of the cable insulation content. By comparing the experimental JTFDR waveform signatures of both new and old cables, it is shown that the shift in the mean dielectric constant of the insulation content can be determined from the phase transition functions obtained from the FFT of the calculated magnitude and phase reactions. Experimental evidence from two forms of cables, XLPE and EPR, indicate that the dielectric constant decreases with accelerated ageing. Finally, the JTFDR surface wave sensing system is developed and implemented to assess the location of age-related insulation loss in power cables. The comparable spectral strength reactions of the performed and non-intrusive surface waves of the JTFDR waveforms clearly demonstrate the corresponding decrease in the bandwidth of the latter mainly due to the reflective existence of the coupling. It is seen that the direction of ageing based insulation damage can be sensed with the aid of a non-intrusive wave launcher and a 120 MHz Gaussian chirp waveform. The studies carried out indicate the cross-correlation peaks at corresponding ageing periods as the cable ages within the heat chamber.

 

Keywords: JTFDR, Rotor Side Converter (RSC), Regulation of interactions, SSIGE, SSRDC, Thyristor Managed Series Condenser (TCSC), Torsional interactions

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References


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