高压电器2025，Vol.61Issue(10)：45-54,10.DOI:10.13296/j.1001-1609.hva.2025.10.006
基于变压器铁心接地电流的特高频局部放电检测方法研究
Research on UHF Partial Discharge Detection Method Based on Grounding Current of Transformer Core
摘要
Abstract
Partial discharge(PD),as a significant indicator of insulation deterioration,is an important basis for diag-nosing the insulation condition of transformers.The existing wideband pulse current detection methods are suscepti-ble to electromagnetic interference from the external environment.Although the ultra-high frequency(UHF)detec-tion offers good immunity to such interferences,yet the installation of UHF sensors is limited due to the requirement for compatibility with transformer structures.In this study,a UHF PD detection method based on the grounding cur-rent of the transformer core is proposed.A UHF simulation model of the transformer is set up using finite difference time domain(FDTD)method,enabling the investigation of the receiving performance of the core for UHF signals by simulation study.Partial discharge experiments are performed using a physical 110 kV power transformer to verify the feasibility and effectiveness of the detection method.The results demonstrate that the The core of a three-phase three-winding transformer can serve as a UHF sensor for PD detection within the frequency ranges of 367-533 MHz,1.29-1.36 GHz,and 2.06-2.44 GHz.The UHF PD detection method based on the grounding current of the core exhib-its consistency with conventional pulse current and UHF detection methods,allowing the characterization of dis-charge intensity based on the amplitude of UHF signals.关键词
变压器/接地电流/铁心/特高频/局部放电Key words
transformer/grounding current/transformer core/ultra-high frequency(UHF)/partial discharge(PD)引用本文复制引用
蔡玲珑,马志钦,廖梓豪,周丹,孙文星,李中祥,肖永健..基于变压器铁心接地电流的特高频局部放电检测方法研究[J].高压电器,2025,61(10):45-54,10.基金项目
广东电网有限责任公司电力科学研究院科技项目(GDKJXM20222576).Project Supported by Science and Technology Project of Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.(GDKJXM20222576). （GDKJXM20222576）
