Results 11 to 20 of about 7,424,343 (94)
High VoltageThe submodule in multilevel modular converters experiences a very fast transient overvoltage (VFTO) during switch operation of gas‐insulated switchgear, which also results in overvoltage on power devices, such as thyristors and insulated gate bipolar ...
Hong Shen +7 more
doaj +3 more sources
The Journal of Engineering, 2019 This study analyses a gas insulated switchgear explosion accident caused by a failure of the circuit breaker (CB) in a thermal power plant, which resulted in the explosion of the CB and the burning of the potential transformer (PT).
Xun Zhang +6 more
doaj +3 more sources
High Voltage, 2023 The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gas gaps of the disconnector.
Zihan Teng +7 more
doaj +2 more sources
Research and Experiments on an External Miniaturized VFTO Measurement System
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 +2 more sources
Research on Ultra-Fast Transient Overvoltage Characteristics of Electric Locomotive
Applied SciencesOperating overvoltage occurs when the pantograph or main breaker of an electric locomotive is operated, which is prone to causing insulation failure of high-voltage equipment.
Yike Guo +3 more
doaj +2 more sources
Modelling and validation of metal oxide surge arrester for very fast transients
High Voltage, 2018 Metal oxide surge arrester models that are currently on rounds suffer from certain deficiencies and as a consequence, they are not in position to portray accurately the arrester residual voltages.
Kannadasan Raju, Valsalal Prasad
doaj +2 more sources
Research on the fitting method to describe the mathematical expression of VFTO in GIS
The Journal of Engineering, Volume 2019, Issue 16, Page 2053-2057, March 2019., 2019 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). Unfortunately, up to the present, there is no standard VFTO waveform to test the high voltage equipment to ensure the safety of power grid. For this reason,
Reem A. Almenweer, Su Yixin, Wu Xixiu
wiley +2 more sources
Applied SciencesWhen the electric locomotive pantograph is dropping, the interruption of pantograph catenary contact causes electromagnetic oscillation and arcing. The frequent arc burning that occurs due to charge accumulation results in the amplitude of overvoltage ...
Dazuo Jiang +5 more
doaj +2 more sources
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
A low‐cost and high‐performance self‐trigger method for high‐voltage transient measurement
High Voltage, Volume 8, Issue 2, Page 412-420, April 2023., 2023 Abstract Stable triggering of acquisition devices is critical to accurately measure electromagnetic transients, especially for very fast transient overvoltages (VFTOs). A highly stable and low‐cos t self‐trigger method for transient measurement is proposed.
Hao Liu +8 more
wiley +1 more source