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Corona inception field strength was one of important parameters for designing fittings in ±800kV DC transmission line. So far Peek formula was based on calculating corona inception field strength of the DC lines fittings with large size in high altitude area. Peek formula was obtained by a large of experimental results for electrode with curvature radius less than 50mm at standard atmospheric pressure...
This paper represents describes method and results of field test on 10kV Multi Chamber Arresters (MCA) in high lightning density area. Application of these devices allows to protect durably and efficiently overhead power lines rated at 10 kV from induced overvoltage.
The source rock sample of the Shahejie Formation (upper Es4) in Jiyang Sag was pyrolyzed under open system with the Rock‐Eval‐II apparatus, and then kinetic model parameters were calibrated for investigating the effect of uncertainty of pro‐exponential factors on kinetic parameters and geological applications, where the parallel first‐order reaction rate model with an average pre‐exponential factor...
With parallel gap, by controlling the motion path of the electric arc, effectively avoid burning and damaging the insulator during lightning strike so that the effect to reduce the accident rate of line is obvious. Because of simple structure, convenient installation and good economical efficiency, its importance in measures of lightning protection for transmitting line is continually improved. Electric...
This paper presents some simulated experimental results and characteristics of upward leader emerging from transmission line, which carried out at the Ultra High Voltage Engineering Technology (Kunming) National Engineering Laboratory. Different measurements were conducted in a 6 m plane-conductor gap under positive and negative polarities impulses of 1 to 3 MV with waveform of 200/2000 μs. The process...
With parallel gap, by controlling the motion path of the electric arc, effectively avoid burning and damaging the insulator during lightning strike so that its importance in measures of lightning protection for transmitting line is continually improved. Initial discharge position is key consideration during design of parallel gap and depends on discharge characteristics of parallel gap under the action...
Shielding failures of lightning is a key problem for the reliable operation of transmission lines. The Leader Progression Method (LPM), based on the theory of long air gap discharge, is an advanced method to evaluate the shielding failure probability of transmission line nowadays. The calculation of surface electric field on phase conductors and ground wires is the key factor that influences the upward...
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