Double Bus Bar switch gear

[Tony S]

A/ on load change over (electrical interlock with bus coupler)
B/ off load change over (mechanical interlock)
C/ turret selector plugs (can only be changed with the breaker truck isolated)
D/ bus coupler
E/ end feed

 

[Tony S]

We have been talking about two different things. I thought you were asking why there are two bus bars per phase.

An interesting subject on its own.

 

[mbrooke]

A/ on load change over (electrical interlock with bus coupler)
B/ off load change over (mechanical interlock)
C/ turret selector plugs (can only be changed with the breaker truck isolated)
D/ bus coupler
E/ end feed

Neat, thank you The ABB catalog mentioned something similar but was confused by it, now I understand.

 

[mbrooke]

FWIW the double bus bar topology is becoming common in GIS gear:


https://www.youtube.com/watch?v=WaRC3wy1VSU



Could you service one bus without taking out the other?

 

[Tony S]

Could you service one bus without taking out the other?

You could by throwing all the loads on to one set of bars. How this was done depended on the change over switch. With the off load and turret plug units it would cause disruption. There would have to be a damn good reason for an outage.

The Reyrolle book I have goes in to the method of extending a live switchboard, it’s heavy reading.

 

[Tony S]

 

[mbrooke]

Thanks