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electricf_81
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Join Date: Sep 2008
Location: Baltimore, Maryland
Posts: 9

Bare Neutral in 15kV Switchgear "Utility Application"

09/19/2017 8:10 AM

Greetings,

In a 15kV outdoor switchgear supplying underground to over head lines, concentric neutral is used in cable underground from switchgear and transitions to bare overhead line. The concentric neutral is landed in the switchgear bare ground buss 100% phase rated. The neutral to ground bond is made at this buss. The 15kV switchgear is fed from a grounded Wye transformer, and it will supply single phase loads/services.

*Has anybody seen this installation anywhere else? how is it typically done in the utility world?

Thank you.
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PeterT
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Join Date: May 2010
Location: Liverpool, NY
Posts: 961
Good Answers: 131
#1

Re: Bare Nuetral in 15kV SWitchgear "UTILITY APPLICATION"

09/19/2017 8:44 AM

Without a drawing or pictures, this sounds pretty normal to me. The concentric neutral should be bonded to the ground bus in the switchgear. Were you thinking it should be an insulated conductor running back to the transformer? Typical distribution substation transformers (usually Delta - Grounded Wye configuration) don't have the neutral carried through into the switchgear, but only tied to ground.

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electricf_81
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Join Date: Sep 2008
Location: Baltimore, Maryland
Posts: 9
#2
In reply to #1

Re: Bare Nuetral in 15kV SWitchgear "UTILITY APPLICATION"

09/19/2017 10:58 AM

Yes, or land the concentric neutral in an insulated buss at the switchgear and bond the neutral at the switchgear and transformer "the incoming from the transformer will also have concentric neutral".

I never used neutral in 15kV before, and I just wanted to compare what is out there for this application. Thank you for your input.
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