Transmission System

Lightning and Switching Voltage Protection Methods

Most insulations fail during one of the following events: Switching overvoltage due to the inductive and capacitive energy of the system overshooting the system voltage that can be as high as 2 × rated voltage. This is analogous to overpressure due to water hammer when a water pipe is suddenly shut off (switched-off). Lightning overvoltage …

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Cable Insulation Resistance Measurement Test

Cable testing is conducted to chart the gradual deterioration over the years, to do acceptance testing after installation, for verification of splices and joints, and for special repair testing. It is always appropriate to conduct the cable insulation resistance measurement test first, and if the data obtained looks good, then proceed with the DC overpotential …

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