Abstract
This study analyzed the transformer electromagnetic gap propagation characteristics. The influence of gap size is also analyzed, and the results experimentally verified. The obtained results indicated that the gap propagation characteristics of electromagnetic wave signals radiated by the partial discharge (PD) source in different directions are substantially different. The intensity of the electromagnetic wave in the gap reaches a maximum at a gap height of 1 cm; and inside the gap, the intensity of the electromagnetic wave depicted an increasing trend at the tail area of the gap. Finally, from the obtained results, some suggestions on where to install sensors in practical systems for ultra high frequency (UHF) PD signal detection in the transformer gap are provided. The obtained results confirmed the feasibility of using this approach. These results can be seen as a benchmark and a challenge for further research in this field.
Highlights
Power transformers are expensive devices that play an important role in power systems
As an effective means of insulation degradation detection, the ultra high frequency (UHF) method has been extensively used in the detection of partial discharge (PD) in transformers [1,2]
Addition, that given that the size of the transformer gap is similar to the wavelength of electromagnetic wave the size of the transformer gap is similar to the wavelength of electromagnetic wave radiated by the radiated bythe the PD source, theelectromagnetic diffraction of wave the electromagnetic will occur through during the diffraction of the will occur duringwave the propagation the propagation through the transformer gap
Summary
Power transformers are expensive devices that play an important role in power systems. The top lid and tank or the tank and pedestal are sealed by an insulating gasket through bolts, forming a non-ferromagnetic material connection gap that surrounds the transformer (Figure 1). Schematic of transformer gap: (a) Gap of top lid and tank and (b) Gap of tank and pedestal Scholars both in China and abroad have studied the gap detection of transformer PD. Reference [8] proposed the PD detection method by detecting electromagnetic waves. Reference [8] proposed the PD detection method by electromagnetic detecting electromagnetic waves. Feasibility of detecting electromagnetic wave signals of the Reference [9,10] proved the feasibility of detecting the PD electromagnetic wave signals of feasibility of detecting theaPD electromagnetic wave signals of transformers a gap the with an transformers through gap with an equiangular spiral antenna.
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