MV/LV transformers - diconnecting chamber

[mastergate]

Can someone advise please about use of air insulated disconnecting chamber(between transformer tank and cable box), or the same oil insulated type, segregated from main tank.
What are benifits and disadvantages?
Can someone send me some details, sketches?

Thanks


BEN.

 

[rbulsara]

What size, voltage? Not sure what do you mean by "disconnecting chamber". Usually there is a cable termination chamber and a disconnecting means, the two are different items.

Check out leading manufacturers' websites and product data sheets. Air insulated terminal chambers are most common in the USA (and I believe elsewhere too) for medium voltages. There are however additional disconnect switches that can be oil immersed in side the main tank, but operable from outside. You can have air switches too.

Rafiq Bulsara

http://www.srengineersct.com

 

[mastergate]

Thanks rafiq.
You're right, this is not a common practice in Morocco for example.
Winding outputs (internal) are welded directly to transformer terminals (external), where incoming cables are connected (plug-in or pass-bars).
So there is no way for example to test cables without disconnecting them physically from transformer terminals.

I'm curious, I did a research but I didn't find interesting details.

I my understanding, these disconnecting chambers are intermidiate connections between transformer which allow sectionning (for individual tests, moving transformer...) without touching incoming/outgoing cables

 

[rbulsara]

If there is no switch between the cables and transformer winding, you need to disconnect the cables for testing. It does not matter what you call it or what the practice is.

Plug in type separable connectors are very common in the US for ease of connection/disconnection and testing. They do require special tools and training though.

Rafiq Bulsara

http://www.srengineersct.com

 

[mastergate]

still need explanation for 'disconnecting means':
-types used (inside, outside?)
-pros & cons
or some manufacturer catalogue, names..

please help.

 

[rbulsara]

Look up websites for cooper industries, ABB, S&C (sandc.com), Westinghouse, GE or similar mfrs in Europe.

Speak to your local or even long distance vendor/sales person.

Rafiq Bulsara

http://www.srengineersct.com