Results 11 to 20 of about 229 (144)
Research on On-Line Detection Method of Transformer Winding Deformation Based on VFTO [PDF]
Sensors, 2021 At present, the detection of transformer winding deformation faults is carried out in an offline state, which requires the transformer to cooperate with the implementation of planned power outages, or it takes place after the sudden failure of the ...
Wenbin Zhang +2 more
exaly +7 more sources
Development and Experimental Research of VFTO Measuring Sensor [PDF]
Sensors, 2022 Very fast transient overvoltage (VFTO) generated by an operating disconnector is one of the main reasons for electromagnetic disturbance in gas-insulated switchgear (GIS) substations.
Zihan Teng +4 more
doaj +4 more sources
Research and Experiments on an External Miniaturized VFTO Measurement System [PDF]
Sensors, 2019 Disconnect switch and circuit breakers operations in gas insulated switchgear (GIS) systems may produce very fast transient overvoltage (VFTO). Detecting VFTO is the first step for researchers to reduce the damage to other equipment of the substation ...
Lizhe Wang +5 more
doaj +5 more sources
IET Generation, Transmission & Distribution, 2023 The operation of disconnectors in gas insulated substation (GIS) or power plant will produce very fast transient overvoltage (VFTO), which is considered to have serious harm to transformer longitudinal insulation and other high‐voltage equipment ...
Runyu Fu +6 more
doaj +2 more sources
Research on VFTO Identification of GIS Based on Wavelet Transform and Singular Value Decomposition
Energies, 2022 The accurate identification of Very Fast Transient Overvoltage (VFTO) is the key of overvoltage control in modern smart grids. In order to accurately identify VFTO generated by the operation of a disconnector in Gas Insulated Substation (GIS), a VFTO ...
Peng Xiao, Qihong Chen
exaly +3 more sources
Research on Online Detection Method of Transformer Winding Deformation Based on VFTO Characteristics
Energies, 2023 At present, most of the winding fault detections of transformers use offline methods, which require the entire line to be powered off or after the transformer has been shut down due to a serious fault, and they cannot detect the running status of the ...
Wenbin Zhang
exaly +3 more sources
Research on the fitting method to describe the mathematical expression of VFTO in GIS
The Journal of Engineering, 2018 Very fast transient over voltage (VFTO) is a unique electromagnetic transient phenomenon occurring in Gas Insulated Substation (GIS), which determines the insulation level of the GIS (above 330 kV).
Reem A. Almenweer, Su Yixin, Wu Xixiu
doaj +2 more sources
Capacitive Sensor for the Measurement of VFTO in GIS [PDF]
11th International Symposium on High-Voltage Engineering (ISH 99), 1999 A capacitive sensor based on the theory of electric field measurements using floating electrodes has been developed for the measurement of VFTO and the same has been fitted to the metallic enclosure of a 145kV gas insulated substation (GIS) experimental test setup available in the laboratory.
Kumar, Vinod V, Joy, Thomas M
openaire +2 more sources
High Voltage, Volume 8, Issue 6, Page 1253-1263, December 2023., 2023 Abstract The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gas gaps of the disconnector. Each spark discharge can be affected by various random factors, such as trapped charge on the load side, the initial operating phase, gap distance and operating speed of the disconnector,
Zihan Teng +7 more
wiley +1 more source
Restrike characteristics of vacuum circuit breaker in its opening process under DC voltage
IET Science, Measurement &Technology, Volume 17, Issue 8, Page 297-307, October 2023., 2023 In this paper, a withstand voltage test platform of 40.5‐kV vacuum circuit breaker was established to obtain the effects of the contact spacing and loop and inrush currents of vacuum circuit breaker on the number of restrike, the wavefront steepness of the breakdown voltage, and the breakdown duration.
Jixing Sun +8 more
wiley +1 more source