BusBar Disconnects 5

[Mbrooke]

What is the purpose of manufacturers/engineers placing disconnects smack in the middle of busbars? Seems pointless, and if anything reduces the availability of any one busbar. Anyone agree this is pointlessly stupid?

https://www.youtube.com/watch?v=k-Oonc1JCLk

 

[stevenal]

It allows deenergized work on a bus section to occur.

 

[sushilksk]

In GIS, this will increase availability and service continuity during repair works involving bus section or sections adjoining bus sections.

 

[cuky2000]

Pallet jack, what is the reason of using the word “stupid”. It is this a professional language?

 

[Mbrooke]

@PalletJack: You don't have single breaker double bus GIS in the US, so I'm not sure how you could understand either since you've never worked in such a substation, going by your inference.


@Stevenal: I get that, but isn't that why the bus is replicated to begin with? Just place everything on the A bus and take the B bus out of service and visa versa. Seems overly complicated, especially for a 6/7 bay station like this.

 

[Mbrooke]

@Cuky2000: PalletJack is simply a detractor. A repudiation complex was triggered in him from me challenging the unbiased nature of the NFPA (or lack there of) on another professional forum a while back. Resulting he now trolls me in every thread with the goal of 1) discrediting my knowledge 2) calling my character/intent into question 3) pushing psychological buttons in hopes of provoking an outburst whereby I can be suspended from these forums based on belligerent conduct.

A certain percentage of individuals exist who do not like authority challenged, being compelled by chauvinism and exceptionalism, in thwarting dissenting opinions so as to de-rail any meaningful discussion or change.

Just a heads up as to where the players stand.

 

[sushilksk]

Important points in GIS:
1. Repair works can take long time, may be ~3 months depending on spares required.
2, In case of fault between Bus-1 & Bus-2 disconnector (GC-03), both bus shutdown is required during repair work.

 

[Mbrooke]

Sushilksk: Thank you! This is the explanation I was looking for! That would make a lot of sense now that I think about it- purple star given.


I'm attaching 3 PDFs on the subject of GIS continuity- asking out of curiosity- but could the GIS bus and isolator partitions be designed such that busbars do not need to be taken out of service for repair on section GC-03? I'm guessing no in that from what I'm reading the neighboring compartment (that would the isolators GC-01 and GC-02) needs to be at reduced SF6 pressure during repair of GC-03 even (if) gas tight barriers existed between each busbar and GC-01 and GC-02.

https://files.engineering.com/getfi...-Substation-Design_for_service_continuity.pdf

https://files.engineering.com/getfi...ability-Availability-Maintainability_IEEE.pdf

https://files.engineering.com/getfi...ile=GIS-Substation-Service-Continuity_ABB.pdf

You've given me a lot to think about... let me think some more... I may have to withdraw my statement in regards to GIS substations.

 

[Mbrooke]

Before I forget- 220kv GIS substation instruction manual using the same gas partition scheme as Sushilksk posted for anyone interested:

https://files.engineering.com/getfi...kV-GIS-Installation-and-Testing-Procedure.pdf

 

[sushilksk]

That would require more partitions, more space, more cost, more chamces of failure...

 

[Mbrooke]

Alright, so off the cuff I drew this up. I added an extra partition between SS3 and SS7, also SS4 and SS7. Ditto for the busbars where the disconnects have a barrier between them and each bus.

Would this work, in theory at least? Cost, space and complexity noted and I am in agreement.



(and yuppers the isolators and breaker are drawn the wrong direction)

 

[Palletjack]

Pallet jack, what is the reason of using the word “stupid”. It is this a professional language?

It was the phrase he used in the OP. That’s why it was in quotation marks.

 

[Mbrooke]

Perhaps I used the wrong choice of words in my original post- and for that I offer my sincere apologies to everyone in this thread.

 

[sushilksk]

On topic, IMO SS6, SS8, SS10, SS12 & SS15 are not required.

 

[Mbrooke]

Valid point. Though I'm having a hard time giving up SS6.