کنفرانس مهندسی برق ایران

صفحه اصلی / سی و یکمین کنفرانس بین المللی مهندسی برق

Designing a Suitable Antenna and Simple Receiver for Detection of Partial Discharge in the UHF Band

نویسندگان :

Seyed Hossein Kasaei¹ Mohammad Hamed Samimi²

1- دانشگاه تهران 2- دانشگاه تهران

کلمات کلیدی :

partial discharge،power transformer،transformer maintenance،UHF،UHF Antenna،UHF Receiver

چکیده :

Partial discharge (PD) in power transformers is one of the major problems that causes transformer failure. The monitoring of PD can help to detect a failure in its early stage. The online monitoring of the PD can fulfill this task. Knowing the location of PD also speeds up the process of repair. Standard IEC 60270 states procedures to measure partial discharge, but this method is not capable of online monitoring and localization directly. Therefore, the electromagnetic and acoustic methods are introduced in IEC 62478 to provide these two options. The electromagnetic method receives electromagnetic waves in UHF, VHF, and HF bands through a sensor. The sensor for the UHF band is an antenna covering frequencies between 0.3 GHz to 3 GHz. An oscilloscope with a high sampling rate is needed to measure these high-frequency signals, which is an expensive equipment. In this paper, three different types of UHF antenna are designed and compared, and a cheap measurement procedure for PD UHF is introduced. This procedure consists of a receiver and a low-cost oscilloscope. One of these antennas that is the most proper for power transformers is selected. The advantage of the proposed receiver and the improvement of sensitivity are shown using experiments. The results show a 67% and 330% increase in the sensitivity detection of PD in a small bandwidth around 0.68 GHz and 2.2 GHz, respectively, with respect to the base band measurement.