Modeling and Investigating Lightning Wave Transfer through Distribution Transformer to Watercraft Power System

Subject Areas : Majlesi Journal of Telecommunication Devices

Shahrouz  Nasiri ¹ ()
Mehdi  Tabasi ² ()
Alireza  Bakhshinejhad ³ ()

Received: 2017-12-26 Accepted : 2017-12-30 Published : 2017-12-01

Keywords: lightning wave transfer in transformer, Transient overvoltage, coast to watercraft power connection, transformer high-frequency model,

Abstract :

This paper deals with modeling and investigating transient overvoltage resulting from lightning in medium voltage grid and transferring it to low-voltage grid inside watercraft during berthing and connection of the grid in the coast. Lightning wave transfer through distribution transformer has been considered taking high-frequency model of transformer into account for passage of impulse wave. The effect of high-frequency model obtained from the transformer has been compared and validated using capacitive π model using previous measurements. The effect of different quantities of the system for connecting coast power to the watercraft including length of the connection cable, the loads on the watercraft network, type of loads, and effect of transformers’ secondary on the watercraft was examined on the level of transient overvoltage on low-voltage loads. Determining the primary and secondary overvoltage levels of transformers allows for specifying the protective level of arrestors for insulator protection coordination. This protective level, which has been obtained from IEEE lightning arrestor selection guideline, has been employed to determine the suitable values of the lightning arrestor for coast to watercraft power connection system.

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