The roof arrester of electric multiple units (EMU) can efficiently limit the overvoltage, and ensure safe operation EMU electrical equipment. In process high-speed operation, traction power supply system is often affected by overvoltage. addition, explosion accidents occasionally occur. this paper, on-line voltage measurement developed. By analysing a large number waveforms, abnormal divided in...

Leakage current measurements can be used to determine the aging condition of ZnO arrester. The leakage that occurs in arrester is divided into two, namely external and internal currents. affected by contamination varistor currents are measured separately their contribution condition. In this study, effect salt on was studied further. level consisted low, medium heavy. obtained analyzed using wa...

According to the physical process of discharge development of insulator that is struck by lightning, the lightning flashover model for quadruple-circuit transmission line with dual voltage 220kV/110kV in same tower is established basing on EMTP. The actual evaluation index of lightning protection performance is adopted with the consideration of influence of system voltage. The characteristics o...

[1] The transient ELF ( 50–5000 Hz) magnetic field radiated by lightning discharges across North America was continuously measured at Duke University during the summer of 2000. In total, 881 sprite-associated lightning discharges over 17 days were analyzed. We report in detail on 76 sprites for which we could reliably determine the lightning charge moment change from the ELF data at the time of...

Gas-insulated substations (GIS) have different specifications in proportion to air-insulated substations. Transformer failures related to lightning and switching are often reported in the gas insulated substation (GIS). This problem is the voltage magnifications due to reflections of switching and lightning surges at various junctions within the GIS. thereby overvoltages in GIS are more importa...

Lightning detection data is a kind of distributed information with high real-timeliness. After the lightning events are detected by the lightning detection network, the original detection data need to be collected and concentrated rapidly and timely for unified management and processing. In this paper, an online monitoring and transmission system for lightning detection information is presented...

The next generation geostationary satellite system starting with GOES-R will include a geostationary lightning mapper (GLM). The GLM will provide nearly continuous times and locations of total lightning with an accuracy of about 10 km over most of the field of view of GOES-east and –west. This coverage will include nearly all of the regions where tropical cyclones occur in the Atlantic and nort...

Aircraft are struck by lightning in flight with some regularity and are required to have demonstrated protection against this threat; much of this demonstration is provided by simulating in test the effects of lightning on aircraft structures, components and systems. Clearly these tests need to be carried out in a representative manner and guidance on how to do this is provided in the Aerospace...

-Lightning protection air terminals are placed on structures and other grounded objects with the purpose of capturing the lightning stroke. A well estimation of the lateral protection distance is crucial in predicting the protection area of the lightning rod. This paper focus on a 3-D numerical modelling of lightning attachment based on physical phenomena leading to the formation and the develo...

[1] We consider the use of lumped voltage and current sources in engineering lightning return stroke models with emphasis on those including a tall strike object. If the model is to be used for computing remote electric and magnetic fields, we suggest a representation of the lightning channel as a transmission line energized by a lumped voltage source, with the voltage magnitude being expressed...