Vee-Vee Connection of PT

Dear sir

One small correction in my previous post.

The PT Ratio is 11KV/root 3 / 110V/root3.

Regards

gova

I am not actually understanding Vee-Vee connection in a 3 phase PT connection, can u explain me for what kind of application it is used to generate what voltage.

your diagram shows only a single phase connected to two fuse units, not sure?. are you telling about star connection.

Dear sir

Out of 3 PTs required, one PT is defective and two PTs are available at Healthy condition.Hence two PTs only put in service as shown in fig.

Regards

G.Govarthinam

by connecting only 2 phase PT's how did you obtain 110V in the PT secondary, as per my experience this kind of connection cannot fetch you the required voltage.

energising the cables which cables, the cables from the PT to the metering instruments, your question is not clear and details provided is not enough, whether the PT's are outdoor type or indoor type.

And upstream breaker trip this mean that the PT's are coming before a transformer and the breaker or in a Bus.

a balanced 3 phase condition is not achieved in your connection and PT's are not easy to handle if we do wrong connections.

if a rough sketch of your SLD is provided we can give you more suggestions about your problem.

In previous post,I told the 11KV HT cable burst.Cable burst was in its terminal.Then cable termination was done newly.

Then,after cleaning,meggering and conducting High voltage test,we put back the equipments shown in sketch in service.

As shown in sketch,only two PTs connected.The secondary voltage is 110 Volt between R ph and B ph.

Regards

G.Govarthinam

Chennai

Which cable "burst" ?

Without information it's imposible to give any sort of answer

I doubt "Ferro-resonance" in your system.