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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I was on hand once when a 13,800 Volt 60 Hz circuit from a 20 mW transformer was closed into a dead short circuit. 6 1000 mcM cables had got mislabeled. at one end and formed a perfect loop short through about 25 m phase to phase .
It was a wonderful test of the Siemens substation gear my partner and myself had just spent the previous month building. Our job included wiring and testing the protective relaying. So it worked.
Thankfully the blame for the error fell on the cable crew.
As was the custom, the order to close the circuit, was given over the radio, while we waited outside the sub station. The breaker cleared the fault with a blast that sounded like a cannon.
The only obvious change noted was where the six cables entered the transformer they were bowed by the forces, otherwise OK. Each cable was about 2 inches in diameter.
Why the mistake happened, on a straightforward job, was because, to save money, the cables were transposed in the middle of a tray crossing a road. This was done because with the forces involved if a short circuit happened (as it did ) the tray would have needed to be much bigger and stronger.
The cable crew looked at both ends of the tray but they couldn't see the transposition.
The bump essentially crashed most of the plant for hours. Later in the day, the transmission circuit running up the coast tripped.
The project engineer was raked over the coals, He told us, such an error, used up his last 'free pass' . Another would send him down the road.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Hazmatt_(The Underdog) wrote ...
1.8K
3.56 MW! Wooo!!!
That kind of load would load the supply down to what... a volt? If you could find a load that could sustain the thermal rise, hahah.
800K is probably more realistic, but still substantial, and oil bath would be required for the insulation class needed.
Notice that this is a pulsed supply. 3.56 MW output power sounds pretty reasonable for a pulsed klystron modulator of this size. The following presentation gives some more details:
Edit: Here's a link to his thesis: , which contains a lot of infomation about the project.
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