Abstract
Gas-insulated switchgears (GIS) have become essential parts of electrical power substations due to the associated merits of these capital assets. Although such resilient devices can rarely suffer from failure, partial discharge (PD) is responsible for around 85% of their recorded collapses. Ultra-high frequency (UHF) techniques have been widely used in the detection and localization of PD for a long time because of their immunity to noise and high sensitivity. Understanding electromagnetic (EM) wave behavior in GIS systems is significant for improving the utilization of UHF sensors in PD detection and for the optimal allocation of UHF antennas inside GIS systems. Thus, this paper is devoted to building a detailed 3D finite element (FE) model based on UHF detection techniques to understand the propagation behavior of EM waves inside GIS. A disk-type UHF sensor is used for acquiring EM waves inside the GIS. The sensitivity of the sensor has been obtained using a gigahertz transverse-electromagnetic (GTEM) test cell. The proposed model investigates the impact of multiple disconnecting parts including L-structure, relative angle between PD source and sensors, and disconnecting switches on the propagation of electromagnetic waves based on step 1 of the CIGRE recommendations. To validate the modeled GIS, a simple L-structured model is initially built, and a comparative analysis has been conducted between the built model and the experimental and analytical results from the literature.
Highlights
T HE determination of whether gas-insulated switchgears (GIS) suffer from partial discharge (PD) has been given great attention since the earliest days to contribute to the operational safety and reliability of such capital assets
The major drawbacks of such technique are the limited information about the exact magnitude of PD charges since there is no direct correlation between the received RF signal strength and the PD intensity, and the difficulties associated with the installation of ultra-high frequency (UHF) sensors in some devices like transformers and built GIS systems [3], [7]
Step 1 of the CIGRE recommendations was used as a mean of analyzing EM waves inside GIS systems due to multiple disconnecting parts
Summary
T HE determination of whether gas-insulated switchgears (GIS) suffer from partial discharge (PD) has been given great attention since the earliest days to contribute to the operational safety and reliability of such capital assets. The major drawbacks of such technique are the limited information about the exact magnitude of PD charges since there is no direct correlation between the received RF signal strength and the PD intensity, and the difficulties associated with the installation of UHF sensors in some devices like transformers and built GIS systems [3], [7]. The resultant electromagnetic (EM) waves are acquired using a second receiving sensor Such analysis is used to obtain the frequency response of UHF sensors and establish PD charge sensitivity. The impact of different disconnecting parts on EM waves inside GIS devices has been extensively investigated and analyzed to improve the utilization of UHF detection techniques [12]–[20].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
