External partial discharge detection of gas-insulated switchgears using a low-noise and enhanced-sensitivity UHF sensor module

• Main Authors: Shu, Zhou, Wang, Wensong, Yang, Chuanshi, Guo, Yanshu, Ji, Jinsheng, Yang, Yan, Shi, Ting, Zhao, Zhenyu, Zheng, Yuanjin
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Engineering::Electrical and electronic engineering; Broadband Noise-Shaping Network; Partial Discharge
• Online Access: https://hdl.handle.net/10356/170755
• Institution: Nanyang Technological University

Ultrahigh frequency (UHF) partial discharge (PD) detection is essential for routine maintenance of gas-insulated switchgear (GIS). Realizing low-noise detection with cost-effectiveness and ease of installation is promising but challenging. This article presents a novel broadband noise-shaping network (BNSN) integrated with a printed monopole antenna (PMA) sensor to realize sufficient noise rejection and good impedance matching. Moreover, by analyzing the equivalent noise circuit and co-designing a high-speed preamplifier circuit with the proposed sensor, the detection sensitivity and anti-interference of the proposed sensor module are improved. The effectiveness and superiority of the proposed sensor are first verified in accordance with IEC 62478, followed by validations using a PD simulator and a real 24-kV GIS. The experimental results demonstrate that the proposed sensor module has the capability to identify different PD types even in noisy environments.