2006-07-14 11:30:50 · 7 answers · asked by tony t 1 in Science & Mathematics ➔ Engineering
There are two types of hydro power turbines:
1. Pelton Wheel --- for high head applications, for water heads above 1500 feet. A Pelton Wheel hydro generator operates at either 3600 or 1800 rpm.
2. Francis Turbine ---- For medium to low head applications, for water heads of below 1500 feet. Francis Turbines can operate at from 150 to 900 rpm.
The speed of the turbine/generator is dependent on the number of PAIRS of POLES of the generator.
RPM = 60Hz x 60secs / pairs of poles
It would be unusual for a low head application like Hoover Dam to have turbines revolving at 1800 rpm.
Source: 50 years electrical engineering experience
2006-07-15 02:35:56 · answer #1 · answered by Barrie66 2 · 1⤊ 0⤋
Hoover Dam Generators
2016-11-07 02:49:42 · answer #2 · answered by horth 4 · 0⤊ 0⤋
Barrie66 is correct but stopped after saying 1800 RPM was highly unlikely and did not follow through with the correct answer.
The Hoover Dam machines have 40 poles. A pair of poles produces 1 electrical cycle per turn. We want 60 Hz which is 60 cycles per second. We have 20 pairs of poles. So 60 / 20 = 3 meaning it must turn at 3 revolutions per second. Rotational speed is usually given as revolutions per minute so 3 x 60 seconds in minute is 180 RPM. There is your answer: They turn at 180 RPM.
2015-04-18 15:48:17 · answer #3 · answered by steve 2 · 2⤊ 0⤋
The generators in Hoover Dam turn at 1800 RPM. This is a standard speed for generators, but in general generators can turn at 3600 RPM, 1800 RPM, or 1200 RPM, depending on the number of poles they have.
The frequency of the AC they generate is 60 Hz.
2006-07-14 17:44:09 · answer #4 · answered by Anonymous · 0⤊ 1⤋
They generate electricity at 60Hz otherwise the fire and other brown smelly stuff would be flying.
I recall a story our physics teacher told us where someone put a generator on line that had the phases wrong. What happened, the generator spun in its concrete case to ALIGN the phases properly.
2006-07-14 15:57:57 · answer #5 · answered by cat_lover 4 · 0⤊ 0⤋
Hmm, a sabetour, eh?
64.3 Hertz, or cycles per second I think.
Good luck trying to resonate a large enough signal to disable the hydroelectric generators! Don't get caught... ::shifty eyes::
2006-07-14 11:40:19 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Each turbine spins at 64.3 RPM.
2006-07-14 11:34:42 · answer #7 · answered by Anonymous · 0⤊ 0⤋