Results 141 to 150 of about 24,218,867 (287)

Research on Ultra‐Wideband Pulse Current Method for DC Partial Discharge Measurement

High Voltage, EarlyView.
ABSTRACT The conventional pulse current method is commonly used in AC or DC withstand voltage tests with partial discharge (PD) monitoring. Because of its relatively narrow measurement bandwidth, this method tends to ignore critical information in PD waveforms, making it difficult to eliminate pulse‐type interference under DC voltage conditions, where ...
Kaining Hou, Zhaoyang Kang, Dongxin He, Hongshun Liu, Qingquan Li   +4 more
wiley   +1 more source

The Catalytic Effect of Low Molecular Weight Acids on the Physicochemical and Dielectric Properties of Oil-Paper Insulation Systems. [PDF]

Polymers (Basel)
Kouassi KD, Fofana I, Hadjadj Y, Yapi KML.   +3 more
europepmc   +1 more source

Deterioration Law of Mechanical Properties of Insulation Pressboard Under Multifield Coupled Ageing

High Voltage, EarlyView.
ABSTRACT Converter transformers can experience progressive deterioration of their oil–pressboard insulation under elevated temperature, combined AC–DC electrical stress and persistent mechanical vibration. This study investigates how mechanical vibration affects the mechanical properties of insulation pressboard and clarifies the associated microscopic
Jiayi Chen, Guan Wang, Zihao Li, Zhongyu Zhao, Kuo Yan, Hongshun Liu   +5 more
wiley   +1 more source

Oil-impregnated densified wood veneer with high electrical insulation enabled by nanosized oil channels. [PDF]

Sci Adv
Wu M, Xu Y, Zhang Q, Brozena A, Mao Y, Liu Y, Xu L, Tejaswi S, Zhang Y, Zhao X, Zhang KC, Ramakrishnan K, Wang O, Nelson J, Bahadur V, Zhu JY, Hebner RE, Hu L.   +17 more
europepmc   +1 more source

Research on Nonuniform Ageing State Assessment of Oil‐Immersed Power Transformers Based on PCA–GWO–RF Algorithm

High Voltage, EarlyView.
ABSTRACT The condition assessment of oil–paper insulation is critical for oil–immersed power transformers, which are fundamental to the reliability of modern power systems. The primary limitation of traditional transformer ageing assessment lies in its macroscopic, whole‐unit approach, which fails to account for the localised effects of nonuniform ...
Mingze Zhang, Muhe Yu, Wei Sun, Ji Liu, Song Cheng, Bingjie Wang, Di Shao, Minghe Chi   +7 more
wiley   +1 more source

Enhancement on thermal, electrical and waterproof performances of cellulose insulating paper with Ar/OMCTS/BN plasma. [PDF]

Sci Rep
Zhu L, Xu H, Chen R, Zhang C, Wang H, Li Y, Xu L, Wang B, Xu Z.   +8 more
europepmc   +1 more source

Wave‐Velocity‐Based Temperature Monitoring Applied to Underground Power Cables in Medium‐Voltage Networks—Discrimination of Individual Cable Temperatures in a Distribution Grid

High Voltage, EarlyView.
ABSTRACT The thermal state of underground power cables can be monitored based on the temperature dependency of the dielectric permittivity of the insulation material. The resulting temperature‐dependent wave velocity is used as a thermometric property. To this end, the signal propagation time along a cable of an injected signal is determined.
Peter Wouters, Peter van der Wielen, Yan Li   +2 more
wiley   +1 more source

Partial Discharge Gas Generation Characteristics and Molecular Degradation Mechanisms of Cellulose Polymers in Eco-Friendly Insulating Oils. [PDF]

Polymers (Basel)
Zhou Y, He Y, Liu G, Kong X, Yan J, Ye W.   +5 more
europepmc   +1 more source

Diffusion of Characteristic Gases in Oil‐Immersed Transformer by Computational Fluid Dynamics Simulation and Experimental Verification

High Voltage, EarlyView.
ABSTRACT The complex diffusion of characteristic gases within oil‐immersed transformers significantly influences the timeliness between the fault occurrence and gas detection. So far, the gas transport processes and spatio‐temporal distributions remain inadequately understood.
Chunpeng Li, Yuan Li, Jianyi Wang, Zhengqin Zhou, Zhihao Liu, Zhiqiu Chen, Dongyang Zheng, Guanjun Zhang   +7 more
wiley   +1 more source

Plasmonic Field-Enhanced Raman Sensing Enables Rapid Trace Methanol Detection in Transformer Oil. [PDF]

Sensors (Basel)
Zhang X, Zhu H, Liu H, Cao J, Shi H, Niu S.   +5 more
europepmc   +1 more source