amps

[reppy007]

We talk about voltage alot,now I have a amperage question,actually two......what was your highest amperage reading,and what was pulling that kind of current............and what would you say has the most amperage...by the way this is amperage on the secondary side........I want to say the highest Ive been involved with was a building that was around 20 stories high......total amperage was around 3000 amps.....we had to use the meter depts. amp meter.

[BigClive]

I've seen a supermarket where I clamped the phases and the first two were fine, but the third must have had everything put on it. The meter went over-range and made a loud buzzing noise when I put the clamp on. I could swear the jaws of the clamp actually seemed to snap together magneticaly too.

[reppy007]

I've seen a supermarket where I clamped the phases and the first two were fine, but the third must have had everything put on it. The meter went over-range and made a loud buzzing noise when I put the clamp on. I could swear the jaws of the clamp actually seemed to snap together magneticaly too.


thats wierd how it can happen,ive heard an ampmeter making strange noises,when it gets around a magnetic field with high amperage,and once during the summer months ,at night I was working on the secondary side of a transformer,the bussbars were really hot to the touch and I was worried that my rubber gloves would actually melt,now thats hot,this urd transformer was a 25kva livefront and it was either pulling 200 or 400 amps,that been awhile back,and I never understood why it didnt burn up or trip off.i believe if it would have been a deadfront it would have tripped.

[stulittle]

Clive,

Nothing like a balanced load !

Reppy,

Lots of the farm sites we look after have 200 amp incomers and many have 400 or 500 amp incomers @ 400 volts, generally these have their own transformer from 11KV and are not fed from the local 400/230 distribution network.

The worst I've seen lately is a 100 amp supply drawing just over 150 amps per phase, that's a little overloaded.

Stu

[rob8210]

The most I have seen is about 800 amps on a 27.6kv feeder, we were cutting in a new set of inlines, many years ago, and wondering why our extraflex 250cu jumper was getting quite warm.

[THE KID]

Had a call one time with the lights keep going dim than back to normal. When we got there we check the voltage and it was fine then all of a sudden we lost voltage. You could hear the Tx have a banging sound then would go back to normal. The amp meter peg out every time the Tx made the banging sound. The problem was a pump station that had all of the floats wrap around each other. It was making all 3 pump motors come on at one time. Thought it would have blown a fuse but never did...

[reppy007]

The most I have seen is about 800 amps on a 27.6kv feeder, we were cutting in a new set of inlines, many years ago, and wondering why our extraflex 250cu jumper was getting quite warm.

800 amps on a feeder,i bet that jumper was a little warm.Good stories on the amps questions.

[rob8210]

Yeah reppy just a little warm, I could feel the heat through my class 4 gloves way too easy. That was a long time ago , now.