> Per unit data representation yields valuable relative magnitude information.
> Circuit analysis of systems containing transformers of various transformation ratios is greatly simplified.
> Circuit parameters tend to fall in relatively narrow numerical ranges making erroneous data easy to spot.
> The p.u. systems are ideal for the computerised analysis and simulation of complex power system problems.
> Manufacturers usually specify the impedance values of equipment in per unit of the equipments rating. If any data is not available, it is easier to assume its per unit value than its numerical value.
> The ohmic value of impedances as referred to secondary is different from the value as referred to primary. However, if base values are selected properly, the p.u. impedance is the same on the two sides of the transformer (Y or Δ ).
> The circuit laws are valid in p.u. systems, power and voltage equations are simplified since the factors of \sqrt{3} and 3 are eliminated.
| Read More Topics |
| General communication system |
| Basic types of communication systems |
| Measurement of power in three phase systems |
