14400:120 PT fuse change

[hughboat]

silly question from a green horn. anyone familiar with a load break device to pull this fuse hot? or would the common recommendation be to take an outage. this is on a manufacturing facility that would love to avoid an outage.

also, what have you seen as likely causes for PT fuses to blow?

thanks in advance.

 

[DTR2011]

In some kinds of metal clad 15kV switchgear, the PT is mounted in a roll out drawer, which pulls the entire PT+ fuse assembly out.

For outdoor applications I have seen hot stick removal.

What kind of PT and where is it located? Have you made any attempt to determine why the fuse is blowing? I would not want to be the person inserting a fuse into a faulted PT.

See the recent thread

http://eng-tips.com/viewthread.cfm?qid=320853

on the possible reasons for a blown fuse.

 

[tinfoil]

http://www.sandc.com/products/switching-overhead-distribution/loadbuster-tool.asp

 

[stevenal]

Why would you need a load break device to remove a blown fuse? If the fuse is blown there is no load.

 

[scottf]

Strongly recommend against replacing a blown VT fuse with the system energized.

It's impossible to tell if it's a fuse failure or a problem originating from the VT itself. Closing a fuse into a damaged/faulty VT could be dangerous.

Need to check out the VTs prior to trying to re-energize, e.g. megger test, ratio test, and possibly excitation test (if you have comparative results).