mbohuntr
Platinum Member
"synchronous condenser" I am familiar with VARS and reactance, but I have not heard that term before... We should talk...:thumbsup:
Generator Electrical Engineering Question
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Soundguy
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Here's a wiki link. I was too tired / lazy to type in my own response 
Synchronous condenser - Wikipedia, the free encyclopedia
Synchronous condenser - Wikipedia, the free encyclopedia
Stampeder
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Scott:
RMS means root MEAN sqaured. It is the square root of the arithmetic mean (average) of the squares of the original values.
So we sample the waveform at different points and square all the values. Then take the mean of them all and then take the square root of that. We used to use chopper stabiliized front ends on voltmeters to do this.
We use this value as the correlation of the heating value of a sinusoidal waveform to compare to the equivalent heating value of a DC source. We use this in calibration labs in order to calibrate RMS voltmeters.
True RMS meters will also measure non sinusoidal waveforms as well.
It sounds a bit complicated but it really isn't. It's when you start getting into inductive loads and power factors that it gets a little tricky.
Spent a lot of years working for HP on test equipment. Very interesting work.
The microwave stuff was the most fun......
Cheers.
Cheers.
RMS means root MEAN sqaured. It is the square root of the arithmetic mean (average) of the squares of the original values.
So we sample the waveform at different points and square all the values. Then take the mean of them all and then take the square root of that. We used to use chopper stabiliized front ends on voltmeters to do this.
We use this value as the correlation of the heating value of a sinusoidal waveform to compare to the equivalent heating value of a DC source. We use this in calibration labs in order to calibrate RMS voltmeters.
True RMS meters will also measure non sinusoidal waveforms as well.
It sounds a bit complicated but it really isn't. It's when you start getting into inductive loads and power factors that it gets a little tricky.
Spent a lot of years working for HP on test equipment. Very interesting work.
The microwave stuff was the most fun......
Cheers.
Cheers.
mbohuntr
Platinum Member
Here's a wiki link. I was too tired / lazy to type in my own response
Synchronous condenser - Wikipedia, the free encyclopedia
That is really cool, overexcitation leads to an inductive loading, and under excitation gives capacitative reactance. I never heard of that!!! Thanks.
Soundguy
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wiki is average onmost things.. out of the ballpark on others, and spot on on a few things.
that one wasn't too bad.
soundguy
that one wasn't too bad.
soundguy
Mock1
Silver Member
During the day at hydro electric plants the water spins the turbine which
rotates the generator. Add excitation and voila you are producing
AC 3 phase power. The big ones in my neck of the woods are 500MW.
At night, huge, and I mean huge, air receivers are used to get rid of the the water from around the turbine and let it spin freely. After VAR support is no longer required, the wicket gates are opened, water will pass over the turbine, and the generator will start to produce power. I work for an IPP in Southern B.C. which owns or operates nine power plants, all hydro-electric.
rotates the generator. Add excitation and voila you are producing
AC 3 phase power. The big ones in my neck of the woods are 500MW.
At night, huge, and I mean huge, air receivers are used to get rid of the the water from around the turbine and let it spin freely. After VAR support is no longer required, the wicket gates are opened, water will pass over the turbine, and the generator will start to produce power. I work for an IPP in Southern B.C. which owns or operates nine power plants, all hydro-electric.
Redneck in training
Elite Member
Most of the load in many industrial plants is inductive. In example refinery has many transformers and induction motors. In order to improve power factor one of the large machines (usually being many megawatts) is driven by synchronous motor that acts as capacitive load used to control the power factor.
mbohuntr
Platinum Member
I have a pretty good theoretical (college) knowlege of electrical/electronic systems. I always assumed that power factor correction came exclusively from the generating/distribution sources. I never knew that large consumers (Steel mills etc.) could correct their own power factor??? If that is the case, then why do distributers recommend large consumers run the large inductive loads at night? I always assumed the power factor would be closer to 1 when the majority of smaller inductive consumers were down at night???
I have also worked at our local (older) hydro stations, I didn't know they could use them for P/F correction, I assumed they stayed online all the time, and the P/F correction came from remote capacitor banks operated by distributers. So the IPP's make more efficient power by correcting their own through excition?? And the consumers by correcting their own the same way???
