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Hi Pet, Thanks for the kind words! Your professor is indeed correct. The worst type of short circuit is a phase-to-phase "bolted fault". This type of fault has been known to cause thick busbars to bend like pretzels, easily breaking off their ceramic standoff insulators, causing thick internal windings of power transformers to bend, crushing insulation between windings, and sometimes even causing them to explode. For low impedance devices (generators and large power transformers), external inductance or internal leakage inductance may be purposely added to limit the bolted fault current to levels that won't destroy the generation or transmission equipment, and to prevent the destruction of the Oil Circuit Breakers (OCB) whose job will be to valiantly interrupt the fault. Good luck in your studies and best wishes, -- Bert --
: : Hey Great Stuff!
: The proffessor who teaches National Electric Code,and Industrial
: Electronics,was introduced to your site Wendsday night. He used a
: Picture of your "shrunken " quarters to emphasise a point he
: had been making in a previous class period about how much damage could
: be done to a wiring system durring a grount fault.Buss bars can be
: bent!We also printed out the article on the process involved in
: shrinking the coins. The entire class was really intrigued.You've got
: some new fans at Fresno City College now!
: Thanks again,and have a blessed day!
:
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