Catastrophic fuse failure

WOW Tony, the boys won't want that one to make a knife sharpener from. Can believe the thyristor module tested good, called shoot-through when one of the thyristor fails to stop conducting and the fuse worked before the 'magic rock' blew.

This being what appears to be an American fuse, i am not sure whether it is a specific semi-conductor fuse..... can you please check and let us know ? thanks.

It is a semi-conductor fuse. I don't think the fact it was on a 1000V DC bus-link helped.

but it didn't hurt, x'sisters survived.

Have you ever worked on a series DC generator/motor with an added "self field" (like a compound motor) and a third variable "separate field" that is varied (with the IC speed on the generator) in a generator hooked to a motor. Old GE locomotive stuff I'm going out on that was put on a Drilling Rig, built in 1962. PM me if you know about this, i have a lot of GE resources so it's not a big thing, thought that you might have worked on. So few people know about series DC machines

The only GE DC traction drive I worked on did me a great favour, it caught fire! Replaced by a Eurodrive thyristor drive I could control direct from the PLC.

If your talking of GE's version of Ward Leodard drives that's a different matter. Some were good, others……

ya that's 'basically' what it is, control the exaction to the generator and move the motor the way you want, of course Gods Electric had to add the extra fields and a air interface between the throttle and the IC speed and one of the fields, used for years on drag lines too.

Inside these is where I learnt about Ward Leonard control, we had 6 of them in Derbyshire and 2 in Yorkshire.

The 3.3KV switches would make any HSE inspectors blood run cold now

Then I went on to these beasts, 170T main hoist 40T & 10T auxiliary hoists. You can see the Ward Leonard gen set on the top

I have seen this 30 years before. Nowadays we use only breakers here.