Answer / rachuri_sree

The cuurrent in the secondary of the arc furnace will be
very high i.e. in kA. Hence the secondary will be devided
into no. of small bus bars and will be connected to the 3
electrodes to form a Delta, using copper hollow tubes and
flexible hoses. Water will be circulating in the copper
tubes for providing cooling. There will be a provision to
change the primary connection either in star or in delta.
Three single phase transformers can also be used instead of
only one 3 phase transformer.

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on 22.03.2015 at 17:15hrs Y phase 66kV class Power Trf-2 Current transformer has flashed over and oil came out. The failed CT has been replaced on 24.03.2015 at 13:15hrs and the Trf has been charged in presence of RT Hassan after conducting the pre-commissioning tests. On the same day at 17:00hrs the commissioned CT has again flashed over and immediately the Trf  has been isolated from power supply. It is confirmed the secondary is not opened and checked the earth integrity and is found ok. Here what would be the reason for the CT failure? 

2 Answers  

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