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Anonymous Poster

Isolated Phase Bus Duct

06/11/2010 1:52 PM

Isolated phase bus duct connect HV/LV side of the transformer to HV/LV CB. HV/LV bushing are OIL to SF6 type double flanged. Current is 1200A/ 2800A (max).

Is it advisable to connect IPB directly to the bushing houshing by bolted connection without electrical isolation?

Can continous current flow through bushing housing and fixing bolts spoil bushing life and interfacing gasket joints?
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Anonymous Poster
#1

Re: Isolated Phase Bus Duct

06/12/2010 2:04 AM

can not.
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Anonymous Poster
#2

Re: Isolated Phase Bus Duct

06/12/2010 1:03 PM

bus ducts are connected to transformer or switch gear through flexibles.This is a must for mechanical isolation
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manroop
Power-User

Join Date: Mar 2010
Posts: 105
#3
In reply to #2

Re: Isolated Phase Bus Duct

06/19/2010 8:47 AM

Dear Mr.Guest,

You are correct & I have to agree fully to you.The connection are done through copper flexibles because they will take care of any expansion in busbar due to heat generated by the current flow.By this you can avoid any load coming on the

transformer bushings which may damage the sealing and the Tr.oil may leak out from the bushings. Generally the busbars in a busduct are not bolted and free to float in their slots - there may be some pins to avoid lateral movements.

Manroop.Chennai.
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