Results 21 to 30 of about 25,281,968 (246)

Research on assessment method for main insulation state of converter transformer based on time‐frequency domain dielectric response

IET Science, Measurement & Technology, 2023
The converter transformer is an essential part of the DC transmission system. Compared with the traditional oil‐impregnated AC transformer, the main insulation of the converter transformer bears more complex electric field aging stress during long‐term ...
Yizhou Zhang, Hao Yun, Mingze Zhang, Shengjie Lei, Yufei Sun   +4 more
doaj   +1 more source

Raman Spectral Characteristics of Oil-Paper Insulation and Its Application to Ageing Stage Assessment of Oil-Immersed Transformers

Energies, 2016
The aging of oil-paper insulation in power transformers may cause serious power failures. Thus, effective monitoring of the condition of the transformer insulation is the key to prevent major accidents.
Jingxin Zou, Weigen Chen, Fu Wan, Zhou Fan, Lingling Du   +4 more
doaj   +1 more source

Ageing characteristics and lifetime model of oil–paper insulation for oil‐immersed paper condenser bushing

High Voltage, 2021
This study extensively investigated the ageing characteristics and lifetime model of oil–paper insulation for oil‐immersed paper condenser bushing. The accelerated thermal and electrothermal ageing experiments of oil‐immersed paper condenser bushing were
Sihang Gao, Lijun Yang, Tingjing Ke
doaj   +1 more source

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

Energies, 2016
This paper focuses on the space charge behavior in oil-paper insulation systems used in power transformers. It begins with the importance of understanding the space charge behavior in oil-paper insulation systems, followed by the introduction of the ...
Chao Tang, Bo Huang, Miao Hao, Zhiqiang Xu, Jian Hao, George Chen   +5 more
doaj   +1 more source

Space charge behaviour in oil and impregnated pressboard combined insulation system [PDF]

, 2014
Dielectric performance of oil-pressboard insulation system used in high voltage direct current (HVDC) convertor transformers can be affected by the presence of space charge.
Hao, Miao, Gordon Wilson, Yuan Zhou, George Chen, Wilson, Gordon, Miao Hao, Paul Jarman, Zhou, Yuan, Jarman, Paul, Chen, George   +9 more
core   +1 more source

Frequency Domain Diagnostics of Transformer Insulation

Приборы и методы измерений, 2019
The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method, method of polarization and depolarization currents ...
M. Gutten, M. Šebok, D. Korenčiak, P. Brnčal, M. Kubiš, P. Żukowski, T. N. Koltunowicz   +6 more
doaj   +1 more source

Parameters Identification and Application of Equivalent Circuit at Low Frequency of Oil-Paper Insulation in Transformer

IEEE Access, 2020
The low frequency section of frequency domain spectroscopy (FDS) of oil-paper insu- lation system can effectively reflect the ageing state and moisture of the oil-immersed paper. Meanwhile, steady-state insulation resistance is the one of indexes for the
Yiming Xie, Jiangjun Ruan
doaj   +1 more source

Research Progress and Prospect of Condition Assessment Techniques for Oil–Paper Insulation Used in Power Systems: A Review

Energies
Oil–paper insulation is the critical insulation element in the modern power system. Under a harsh operating environment, oil–paper insulation will deteriorate gradually, resulting in electrical accidents. Thus, it is important to evaluate and monitor the
Zaijun Jiang, Xin Li, Heng Zhang, Enze Zhang, Chuying Liu, Xianhao Fan, Jiefeng Liu   +6 more
doaj   +1 more source

Modified Expression of Moisture Diffusion Factor for Non-Oil-Immersed Insulation Paper

IEEE Access, 2019
Studying the moisture diffusion in non-oil-immersed insulation paper is helpful to optimize the drying process and improve the drying efficiency of oil-immersed equipment.
Dongyang Wang, Lijun Zhou, Lujia Wang, Lei Guo, Wei Liao   +4 more
doaj   +1 more source

Electrospun Wood‐Derived Biopolymers as Electrodes in Electrochemical Energy Storage Technologies

Advanced Functional Materials, EarlyView.
Electrospinning transforms wood‐derived cellulose and lignin into architecturally defined, binder‐free carbon electrodes with tuneable porosity and functionality. This review shows how fibre design enables decoupled charge and mass transport, enhancing performance across battery systems, while identifying key challenges in spinnability, scalability ...
Michael W. Thielke, Hattie R. Chisnall, Jesus Vazquez Chavez, Ana B. Jorge Sobrido   +3 more
wiley   +1 more source