An Uwb Printed Antenna for Partial Discharge Uhf Detection in High Voltage Switchgears

In this paper, the design and development of a bio-inspired UHF sensor for partial discharge detection in power transformers is presented. The UHF sensor was developed for external use in dielectric windows of power transformers. For this purpose, a microstrip antenna was designed with a radiating element shape based on the leaf of the Jatropha mollissima (Pohl) Baill plant. Then, an epoxy coating and an aluminium enclosure were developed to protect the antenna against corrosion and to provide mechanical support, external noise immunity, and a lifetime compatibility with power transformers. In order to verify the electrical parameters of the developed sensor, measurements of the gain and the reflection coefficient were performed in an anechoic chamber. Lastly, the antenna sensitivity for denominated partial discharge (PD) detection was compared with the IEC 60270 standard method. For this purpose, simultaneous tests were carried out in a partial discharge generator setup, composed of an oil cell with needle-plane electrodes. The experimental tests demonstrated the effectiveness of the sensor for detecting PD signals with apparent charge values higher than 35 pC.

Section: Introductionmentioning

confidence: 99%

Design and Development of a Bio-Inspired UHF Sensor for Partial Discharge Detection in Power Transformers

Nobrega

Xavier

Aquino

et al. 2019

“…The PMA sensitivity was tested by checking the criteria established by [27] for PD detection applications, which recommends that PMAs must present a mean gain higher than 2 dBi for their respective operating bandwidth.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, in order to detect the inception of PD (low intensity pulses), the application of PMAs with high mean gain is required [27], making the evaluation of gain enhancement technique assimilation on PMAs designed for PD detection interesting.…”

Section: Introductionmentioning

confidence: 99%

Design and Application of a Metamaterial Superstrate on a Bio-Inspired Antenna for Partial Discharge Detection through Dielectric Windows

Xavier

Serres

Costa

et al. 2019

The adaptation of dielectric windows as metamaterial superstrate over a bio-inspired Printed Monopole Antenna (PMA) was evaluated in order to improve the detection sensitivity of Ultra High Frequency (UHF) sensors designed for Partial Discharge (PD) measurement. For this purpose, rectangular and circular Split Ring Resonators (SRR) structures were designed and evaluated aiming to achieve a metamaterial superstrate that improves the characteristics of the bio-inspired PMA as the gain, bandwidth, and radiation pattern. Measurements of the PMA with metamaterial superstrate were carried out in an anechoic chamber and compared to the simulations performed. The results show that the metamaterial superstrate insertion did not impact the original operating bandwidth, covering most of the characteristic frequency range of PD activity. Moreover, this insertion resulted in a mean gain enhancement of 0.7 dBi regarding the reference PMA, resulting in an antenna with better sensitivity for PD detection (mean gain of 3.61 dBi). The PMA-metamaterial set PD detection sensitivity was evaluated through laboratory tests with a point-to-plane PD generator setup and in field with measurements from a 230 kV current transformer. The developed PMA-metamaterial set was able to detect, successfully, the activity of PD for both tests, being classified as an optimized sensor for PD detection through dielectric windows.

“…Most of them address multi-narrow-band operation [19,20,21], reach only modestly performance (Voltage Standing-Wave Ratio [VSWR] < 5) [22,23,24] or only work at higher frequency bands (0.75–1.5 GHz) [25]. Then, with the simultaneous application of a bio-inspired geometry design and bandwidth enhancement techniques, it is expected the development of a new UHF sensor that presents a compact size and enough bandwidth for the PD detection application, providing a better relation size-bandwidth than the cited and other antennas found in the PD application literature [26,27,28,29,30,31,32]. Additionally, bio-inspired geometries provide higher density of current concentrations on the antenna transmission line, resulting in higher mean gain than classical and modified PMA shapes developed for PD detection [20,21,26,27,31], resulting in a higher PD detection sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Bio-inspired Printed Monopole Antenna Applied to Partial Discharge Detection

Cruz

Serres

Oliveira

et al. 2019

A new, bio-inspired printed monopole antenna (PMA) model is applied to monitor partial discharge (PD) activity in high voltage insulating systems. An optimized sensor was obtained by designing a PMA in accordance with the characteristics of the electromagnetic signal produced by PD. An ultra-wideband (UWB) antenna was obtained by applying the truncated ground plane technique. The patch geometry was bio-inspired by that of the Inga Marginata leaf, resulting in a significant reduction in size. To verify the operating frequency and gain of the PMA, measurements were carried out in an anechoic chamber. The results show that the antenna operating bandwidth covers most of the frequency range of PD occurrence. Moreover, the antenna presented a good sensitivity (mean gain of 3.63 dBi). The antenna performance was evaluated through comparative results with the standard IEC 60270 method. For this purpose, simultaneous tests were carried out in a PD generator arrangement, composed by an oil cell with point-to-plane electrode configurations. The developed PMA can be classified as an optimized sensor for PD detection and suitable for substation application, since it is able to measure PD radiated signals with half the voltage levels obtained from the IEC method and is immune to corona discharges.