Research on the Response Characteristics of Core Grounding Current Signals in Power Transformers Under Different Operating Conditions

Li Wang, Hongwei Ding, Dong Cai, Yu Liu, Peng Du, Xiankang Dai, Zhenghai Sha and Xutao Han ()
Additional contact information
Li Wang: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Hongwei Ding: State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Dong Cai: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Yu Liu: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Peng Du: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Xiankang Dai: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Zhenghai Sha: China Three Gorges Group Jiangsu Energy Investment Co., Ltd., Nanjing 210019, China
Xutao Han: State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2025, vol. 18, issue 16, 1-18

Abstract: This study delves into the response characteristics of core grounding current signals in power transformers across different operating conditions, aiming to enhance the accuracy of transformer condition assessment. Existing detection technologies often rely on single-parameter methods, which fall short in providing a comprehensive evaluation of transformer conditions. To address this limitation, this research develops a wideband circuit model based on multi-conductor transmission line theory and backed by experimental validation. The model systematically investigates the response mechanisms of core grounding current to various electrical stresses, including impulse voltages, power-frequency harmonics, and partial discharges. The findings reveal distinct response characteristics of core grounding current under different stresses. Under impulse voltage excitation, the core current exhibits high-frequency oscillatory decay with characteristics linked to voltage waveform parameters. In harmonic conditions, the current spectrum shows linear correspondence with excitation voltages, with no resonance below 1 kHz. Partial discharges induce high-frequency oscillations in the grounding current due to multi-resonant networks formed by distributed winding-core parameters. This study establishes a new theoretical framework for transformer condition assessment based on core grounding current analysis, offering critical insights for optimizing detection technologies and overcoming the limitations of traditional methods.

Keywords: simulation models; power transformers; condition monitoring (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/16/4365/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/16/4365/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:16:p:4365-:d:1725860

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().