Power grids

  • Thread starter ranju
  • Start date
  • #1
223
3
I have got to know that the voltage and frequency of the supply in the power grids is kept as infinity.>!! But what is the reason behind it..??
Well for the voltage to be infinity , I have studied that losses are inversely proportional to square of supply voltage ..so higher is the voltage , lesser will be the losses..!!
But what is the reason behind infinite frequency..please explain.>!!
 

Answers and Replies

  • #2
Doug Huffman
Gold Member
804
111
Neither voltage nor frequency are ever infinite or maintained at infinity. AC Transmission frequency is the same as distribution frequency. Voltage may be much higher, but infinity is a fiction.
 
  • #3
549
28
I think that you might have heard the phrase, an infinite grid, and don't understand what it means.
 
  • #4
berkeman
Mentor
59,271
9,429
I have got to know that the voltage and frequency of the supply in the power grids is kept as infinity.>!! But what is the reason behind it..??
Well for the voltage to be infinity , I have studied that losses are inversely proportional to square of supply voltage ..so higher is the voltage , lesser will be the losses..!!
But what is the reason behind infinite frequency..please explain.>!!

As has been pointed out, you seem to have some confusion on how AC power is distributed. Can you post links to the reading that you have been doing that is causing these questions?
 
  • #5
469
126
In my opinion what you heard –may be-it is that short-circuit power of a grid could be considered infinity if you calculate short-circuit current down stream a transformer. It will be a little bit conservative but for a rough appreciation it is ok. As already it is written in above posts the system frequency and the voltage would stay as rated.
 
  • #6
223
3
Bu this is what told to us by our prof. !!
 
  • #7
Averagesupernova
Science Advisor
Gold Member
3,824
756
Then he be wrong. I was once told by someone who should have known better that the reason the load was placed in the collector on grounded emitter BJT switch circuits (relay coil, LED, etc.) was because the collector typically has more heat sink area. Just because they should know does not mean they do know.
 
  • #8
russ_watters
Mentor
20,413
7,015
Or he be right and the OP misheard...
 
  • Like
Likes dlgoff and davenn
  • #9
360
21
OP misunderstood -I think. We be callin' the grid the infinite machine or the infinite grid (even though it is not).
 
  • #10
anorlunda
Staff Emeritus
Insights Author
9,264
6,292
I think the OP misheard slightly. In power analysis, it is common to use the concept of an infinite bus.

An infinite bus is one that will maintain constant magnitude, phase, and frequency of voltage, while supplying any current or any power. It is a simplifying concept, not something that we find in real life.

In "load flow" analysis where we calculate the voltages, current, and power flows for an entire power grid, it is necessary for one node in the network to be treated as an infinite bus.
 

Related Threads on Power grids

  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
6
Views
3K
  • Last Post
2
Replies
46
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
21
Views
10K
Replies
1
Views
737
Replies
25
Views
5K
Replies
2
Views
622
Replies
8
Views
890
  • Last Post
5
Replies
116
Views
3K
Top