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- W2509415879 abstract "In back flashover analysis of a transmission line by a circuit simulator like EMTP, we should use the adequate equivalent circuit of transmission line towers for reliable results. The tower surge impedance in many reports has been discussed by the electromagnetic field theory or loop voltage method that calculates the voltage by magnetic potential. However, the theoretical values are several tens ohms larger than the measured values. In this paper the several reasons of the discrepancy between the theory and measured values were discussed. From the results, it became clear that Maxwell's equations are not satisfied in the conventional loop voltage method, in which the tower current is assumed as a constant value and constant velocity current between the tower top and the ground base. The loop voltage method does not satisfy the boundary condition that the tangential electric field on the conductor of the tower is zero, and this incongruity makes the calculated tower surge impedance larger than measured one. Although the loop voltage method is convenient to calculate the tower surge impedance as function of the tower height and the radius, it should be examined in the application of the theory to the back flashover analysis. A nonuniform transmission line model was applied to calculate the surge impedance of a rod vertical to ground. The surge impedance calculated numerically by inverse Laplace transformation showed good accordance with the average characteristic impedance. For the simple calculation of surge impedance, we obtained also an analytical equation by the approximation of the nonuniform transmission line, which is almost equal to the experimental equation." @default.
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- W2509415879 date "1995-01-01" @default.
- W2509415879 modified "2023-09-27" @default.
- W2509415879 title "Study of Loop Voltage Method in Tower Surge Response Analysis" @default.
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- W2509415879 doi "https://doi.org/10.1541/ieejpes1990.115.5_517" @default.
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