Design and Testing Small Printed Antennas as Internal UHF Sensors of Partial Discharge for High Voltage Transformers

verfasst von

Irfan Zidny, Behnam Balali, Moritz Kuhnke, Peter Werle, Suwarno

Abstract

Power transformers are crucial and require continuous monitoring to prevent failures. Partial discharge (PD), a significant phenomenon, emits electromagnetic waves, acoustic waves, and light, and causes chemical decomposition of insulation materials. Current technology allows a real-time PD monitoring using the Ultra-High Frequency (UHF) method. This contribution aims to design a small printed antenna for internal UHF sensing within the transformer tank, using low-cost Printed Circuit Board (PCB) materials. A printed antenna less than 4 cm x 4 cm was designed and optimized through parameter sweeps to achieve a proper return loss below 1 GHz. Impedance matching is important to achieve an appropriate return loss, and smaller antennas face high impedance mismatching challenges. Adding a resistive loading can solve the impedance mismatching. To study the impact of the transformer tank model as a cavity resonator on the impedance matching of the printed antenna, the antenna was inserted into the tank model through different valves, and the return loss measurement was conducted. Furthermore, a frequency analysis was performed using a spectrum analyzer to identify the optimal frequency range for PD detection, ensuring a high signal-to-noise ratio. Validation of the performance of printed the antenna in PD detection for different PD models was done through a comparison of the Phase-Resolved Partial Discharge (PRPD) patterns obtained through conventional electrical PD measurements according to IEC 60270 and acquired by the printed antenna using the UHF method. This study demonstrates the feasibility of using a small printed antenna for real-time PD monitoring in high-voltage transformers.

Organisationseinheit(en)

Fachgebiet Hochspannungstechnik und Asset Management (Schering-Institut)
Institut für Elektrische Energiesysteme

Externe Organisation(en)

Institut Teknologi Bandung (ITB)
PT PLN (Persero) Kantor Pusat

Typ

Artikel

Journal

International Journal on Electrical Engineering and Informatics

Band

16

Seiten

408-424

Anzahl der Seiten

17

ISSN

2085-6830

Publikationsdatum

09.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Informatik (sonstige), Allgemeine Computerwissenschaft, Allgemeiner Maschinenbau

Elektronische Version(en)

https://doi.org/10.15676/ijeei.2024.16.3.5 (Zugang: Offen)