Teardown of a Medium Voltage 7200V 200A Fuse

A medium voltage fuse from the secondary side of a distribution transformer, the last high voltage part of the grid before the consumer.
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#electronicscreators
#fuse #highvoltage #transformer

[@SeanBZA]

The LV fuses also have a similar construction, just a lot of silver ribbons in the silica sand, and of course no striker assembly. All there to ensure that on fault clearance there is no way that any conductive part can be made afterwards, and that the energy of clearing the fault is safely absorbed in the shell.
The 350MVA rating is there so that the installers are aware that the fuse can only be used on a transformer under 350MVA rating, as the larger ones ( next size typically being 425MVA and then 500MVA) have a prospective fault current too high for these fuses to safely break them, you need to use another type of larger fuse, that physically will not fit the holder for this fuse and vice versa, that can handle the order of magnitude larger fault current.
Interesting to see how Brown Boveri cooperated and absorbed smaller companies, I was only aware of how Brown and Boveri first amalgamated, becoming Brown Boveri, then later were incorporated into Asea, with them now being ABB, though here they were a long time known as Asea Brown Boveri. I have a lot of Brown Boveri relays in use, they are obsolete, but incredibly reliable though, many having over 20 million cycles on them, and the only failures I get are the cores mechanically wearing out, or the contact assemblies actually breaking from fatigue.

[@KaizerPowerElectronicsDk]

Thank you for the additional information. It is true that LV fuses implement the same features, but the much lower energy in a fault current does not give the same results.
Old ABB equipment is incredible sturdy, I work with customers that still has ABB MasterPiece 200/1 controllers, these are close to 30 years old now and still run. Some cards die once in a while, but those Motorola 68000 CPUs just keep going :)

[@CliveChamberlain946]

Very enjoyable sir! Question: Will you be submitting any video for publication on EEVblog during Dave's vacation in January? He wants to spot light lesser known channels... (he will share the revenue. In my books, that guy has a good heart!).

[@KaizerPowerElectronicsDk]

Thank you for the kind words and also thank you for pointing me towards Dave's guest video, I was not aware of this.

[@williampommeranz6821]

Im thinking the brass piece is to allow threading. Copper is too soft. Also maybe easier to solder copper to brass.
Just a guess.

[@meisam9592]

Taking a random path along the videos ;) Keep up the good work my man!

[@meisam9592]

A classy man with a classy paper-weight! I love it.

[@markhodgson2348]

Clive from "bigclivedotcom" had a live fuse detonator intacted very interesting video

[@claypotts2334]

Here from your latest video

[@andystadi]

very good Video! thank you!

[@KaizerPowerElectronicsDk]

Glad you liked it!

[@sabrinerr1708]

Hello,
Thanks for the video it was so helpful , i have a question about the name of that type of wires ! It would be so nice if you give me this information.
Thanks in advance :)

[@you238]

Are these the things that go BAM when you see linemen with long poles slam circuits shut?

[@KaizerPowerElectronicsDk]

Hopefully not, that would mean they created a short-circuit or switched in a too high load.

[@shipoffools2183]

If something goes bam when the linesman is working on it, then there is going to be more problems along the grid!