Why is S_{RATED}=I_{RATED}V_{RATED} Insufficient for Synchronous Generators?

Click For Summary
SUMMARY

The formula S_{RATED}=I_{RATED}V_{RATED} is insufficient for synchronous generators because it does not account for the three-phase nature of these machines. In the case of a synchronous generator with a nameplate rating of 10MVA and 13.8kV, the correct calculation for full load current requires using the formula I_{RATED} = S_{RATED} / (√3 * V_{line}). This adjustment is crucial for accurate voltage regulation calculations, as the line voltage must be considered in the context of three-phase power systems.

PREREQUISITES
  • Understanding of synchronous generator specifications
  • Knowledge of three-phase power systems
  • Familiarity with electrical power formulas
  • Basic concepts of voltage regulation in generators
NEXT STEPS
  • Study three-phase power calculations in detail
  • Learn about synchronous generator voltage regulation techniques
  • Explore the differences between transformer and generator power equations
  • Investigate the implications of line voltage versus phase voltage
USEFUL FOR

Electrical engineers, power system analysts, and students studying synchronous generators and their operational characteristics will benefit from this discussion.

sandy.bridge
Messages
797
Reaction score
1
Hey all,

If we are given a synchronous generator with the following nameplate values 10MVA, 13.8kV, 2 pole, 60 Hz

why is it not sufficient to go
S_{RATED}=I_{RATED}V_{RATED}

as we did for transformers?

My reason for asking is because I am trying to determine the voltage regulation of a particular generator. However, if I determine the full load current using the above formula, I get an absurd result.
 
Last edited:
Engineering news on Phys.org
Is the generator a 3 phase machine? If so, the apparent power = √3 Voltageline ⋅ Currentline.
13.8kv is a line voltage.
 
How silly of me. Honestly, this entire time my issue was that I did not divide S by three. Thanks!
 

Similar threads

Direct loading of synchronous generator
  • · Replies 3 ·
Replies
3
Views
1K
Why does a larger synchronous generator have a better rating
  • · Replies 1 ·
Replies
1
Views
1K
Can a generator safely handle full load amps at different power factors?
  • · Replies 4 ·
Replies
4
Views
3K
Buck Converter Design for PMDC Motor
  • · Replies 1 ·
Replies
1
Views
4K
Why does more bandwidth means higher bit rate in digital transmission?
  • · Replies 4 ·
Replies
4
Views
7K
Synchronous Machine Homework Help: Calculating Generated Voltage and Power Angle
  • · Replies 1 ·
Replies
1
Views
3K