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In this paper, based on Visual C + +6.0 high-level programming language, it developed the transmission line lightning trip evaluation system, this system could complete differential Lightning protection calculation, evaluate the transmission line's lightning performance and provide factor graphs of the lightning withstand level, with it user can take appropriate measures for lightning protection....
The lightning performance on four 500/220-kV segments of quadruple circuit lines on the same tower of Nanyan line is analyzed by traveling wave method and electric geometry method in this paper. The results indicate that double-circuit 220-kV transmission line protect double-circuit 500-kV transmission line because of different insulation protection, the lightning-understanding level of 220-kV line...
There are two ways to transmit signals which are RS-485 signal and a kind of special signal in the new type of Smart water meter's data acquisition card. The work on design of the Surge Protection Device (SPD) is made by estimating the lightning current which travels in signal wires, comparing the capacity of restraining interfering signal between balanced signal and unbalanced signal, in according...
The parallel continuous type of counterpoise wire is the best ground system currently, it is reduce the ground resistance less than 25 ?? in high resistivity of soil arriving 4450 ??m with 400 m length. The created ground system types of proposed chem-counterpoise can be used in both homogenous and inhomogeneous soil that have soil resistivity arriving 10000 ??m. The proposed chem-counterpoise devices...
This paper describes shielding method for lightning protection on high voltage transmission line and also how to protect lightning effects on the line. If the fault is present, additional power system will be damaged and minimizing system reliability. This shielding method used in transmission line bases the unequal lightning ground flash density all over the country. This paper is tend to specialize...
Recently, the lightning strokes to transmission lines are been watched more carefully due to the needs to improve the transmission lines performance and the power quality. The TLM (Transmission-Line-Model) numerical technique is applied to model a distribution line, surge arresters, grounding electrodes impedance time varying, and the connecting leads to ground. Two simulations are shown and compared...
Lightning has been a major concern to the power system researchers because it can cause damage to the connected electrical equipment and transmission failure. One study carried out is that where the level of voltage at a substation is observed following a backflashover analysis on a transmission line. Sample of worst case transmission line was taken from Tenaga National Berhad, which is 132 kV Kuala...
In this paper, I did much research on the base of the general lightning protection measure. By referring to lots of literature, the author proposed one new lightning protection measure-add horizontal side needle on side of overhead ground wire. This method can has good effect in lightning protection. By theoretical analysis and calculation, we designed a scale model of this new measure. Then we did...
Lightning flash is one of the natural causes of faults in overhead transmission lines. The critical stroke current which causes flashover is a basic parameter characterizing the lightning performance of transmission lines. In recent times, there has not been any mature experience to be referred to either in China or other foreign countries of the study on lightning withstand level of UHVDC transmission...
This paper focus on lightning disturbance on 110 kV transmission line in Anhui Chizhou electric power supply company, and discovers that, most of lightning disturbances happened in mountainous area are counterattack, which are caused by lightning striking on overhead tower or shielding wires, but in some special area, shielding failure also happens sometimes. Based on mechanism of counterattack and...
This paper presents a comparative lightning performance study conducted on a 275 kV double circuit shielded transmission line using two software programs, TFlash and Sigma-Slp. The line performance was investigated by using both a single stroke and a statistical performance analysis and considering cases of shielding failure and backflashover. A sensitivity analysis was carried out to determine the...
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