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Wind turbine generators in a windfarm are connected by underground cables. Lightning sometimes strikes a nacelle or a blade. Lightning overvoltages due to a direct lightning strike to the system cause damages in the underground cable. Many parameters should be investigated to establish a rational lightning protection design for wind power generation system. Numerical simulation is a useful method to discuss the influence of the parameters on the lightning overvoltages. This paper uses an Electro-Magnetic Transients Program for the lightning surge analysis. This paper discusses the influence of grounding method of metallic sheath of the cable and grounding resistance on the lightning overvoltages for the direct lightning strike to the generation system. [ABSTRACT FROM AUTHOR]

Proposes a time domain model of a fault locator with special reference to fault arc nonlinearities by applying the MODELS language of the EMTP. Digital fault locator algorithm; Fault locator model description; Influence of fault arc characteristics.

Proposes two methods for fault point location in parallel double-circuit multi-terminal transmission lines by using voltages and currents information from ccvt and current transformers at all terminal. Fault location of multi-terminal transmission lines by the impedance relay method; Fault location by using the current diversion ratio method.

Studies digital fault location for high resistance grounded electric power transmission lines. Importance of fault locators to support prompt recovery from transmission line fault; Effect of multiple load taps on single-phase-to-ground fault location; Fault location methods for parallel two-circuit two-terminal transmission lines.