Bus bars traversing over bus bars

[mbrooke]

When crews service a bus bar, how far must de-enerigzed bars from energized bars? Can bus bar insulators be replaced live and how often do they fail prior to 40 in-service years?

The design to the right is economical to build, but repair down the road is being called into question.

 

[Julius Right]

In my opinion, what do you need are bus disconnectors. So you could de-energize a system and work on another.
If it is height enough you may pass the connection bar under the main busbar.

 

[mbrooke]

In my opinion, what do you need are bus disconnectors. So you could de-energize a system and work on another.
If it is height enough you may pass the connection bar under the main busbar. View attachment 16768

What are those? :dunce:

I know of pentographs being used at 132 and 400kv but don't know of any made for 34.5kv. Unless you are thinking of something else.

 

[Julius Right]

I am sorry. At first I didn’t know the voltage. Second neither even for above 132 kV indoor distribution like this I did not see for a long time. Now GIS it is more convenient. By the way, the line of circuit breakers are the ancient “Bulk Oil Circuit Breakers", indeed? I saw one like this for the last time 50 years ago.
For up to 36 kV I don’t know open installation else but Switchgear –metal clad-only.

 

[mbrooke]

I am sorry. At first I didn’t know the voltage. Second neither even for above 132 kV indoor distribution like this I did not see for a long time.

This is an outdoor substation.

Now GIS it is more convenient. By the way, the line of circuit breakers are the ancient “Bulk Oil Circuit Breakers", indeed? I saw one like this for the last time 50 years ago.

Vacuum breaker:


http://www.abb.com/product/db0003db004279/c12573990063647085256aea006dbae3.aspx

http://inv.bassmachinery.com/q/nlist/=,000920,20275734

Although they do look like bulk oil breakers lol. FWIW the final design might have SF6 instead.

For up to 36 kV I don’t know open installation else but Switchgear –metal clad-only.

Its ok, it varies.