Category: OVERVOLTAGE

Classification of Transmission Lines

Classification of Transmission Lines: Classification of Transmission Lines are usually classified as Lines with no loss or ideal lines, Lines without distortion or distortion less lines Lines with small losses, and Lines with infinite and finite length defined by all the four parameters. 1.Lines with no loss or ideal lines A line is said to […]

Travelling Waves on Transmission Lines

Travelling Waves on Transmission Lines: Any disturbance on a Travelling Waves on Transmission Lines or system such as sudden opening or closing of line, a short circuit or a fault results in the development of overvoltages or overcurrents at that point. This disturbance propagates as a travelling wave to the ends of the line or […]

Mathematical Model of Lightning Stroke

Mathematical Model of Lightning Stroke: During the charge formation process, the cloud may be considered to be a non­conductor. Hence, various potentials may be assumed at different parts of the cloud. If the charging process is continued, it is probable that the gradient at certain parts of the charged region exceeds the breakdown strength of […]

Characteristics of Lightning Strokes

Parameters and Characteristics of Lightning Strokes: The parameters and Characteristics of Lightning Strokes include the amplitude of the currents, the rate of rise, the probability distribution of the above, and the waveshapes of the lightning voltages and currents. Typical oscillograms of the lightning current and voltage waveshapes on a transmission line are shown in Figs […]

Mechanism of Lightning Strokes

Mechanism of Lightning Strokes: When the electric field intensity at some point in the charge concentrated cloud exceeds the breakdown value of the moist ionized air (≈ 10 kV/cm), an electric streamer with plasma starts towards the ground with a velocity of about 1/10 times that of the Mechanism of Lightning Strokes, but may progress […]

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