Can cut-out fuses have a current rating of 250 Amp at 23 kV?

[Dvhez]

I was designing a oneline diagram at work where I have substations (5) with a distance of 1 km between the first one and the next one (and so on). At tie-in I have a switchgear with the corresponding main circuit breaker, however, I have a cutout fuse upstream (2 km) of the switchgear to protect the line. So my questions are:

1. Can this cutout fuse withstand 250 Amp at 23 kV?
2. If not, what are the alternatives available instead of installing a recloser?


Thanks.

 

[jghrist]

A one-line would help us understand the question. What is the fuse type and rating? What is the significance of 250 Amp, maximum load?

 

[waross]

Are 250 Amp fused cutouts available?
A fused cutout won't provide re-closing.
Well there was once a recloser scheme based on fused cutouts but the last of those was probably gone 50 years ago.
I have only seen fused cutout based reclosers in very old text books.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[mgtrp]

I have only seen fused cutout based reclosers in very old text books.

Cut-out based reclosers are making an entry though... (for example, here)

With regards to the original question, I haven't come across cutout fuses above 200A. IEEE C37.42 only seems to have standard ratings up to 200A, so I suspect that this is what the holders are designed for.

Cheers,
mgtrp

 

[wroggent]

We are using tripsavers.

 

[waross]

The original just used fused cutouts. When a fuse-holder dropped it closed a contact that put the adjacent fuse-holder in circuit.
The time delay was fixed at the time it took the fuse-holder to drop.

Bill
--------------------
"Why not the best?"
Jimmy Carter