hello friends once again i am here ........
today i discuss about typical electrical system
- 2-Wire, Single Phase (Outside U.S.).
- 3-Wire Single-Phase.
- 3-Wire 3-Phase Delta (Corner Ground).
- 4-Wire 3-Phase "Wye".
- 4-Wire, 3-Phase Delta (High Leg)
above all the systems known as typical electrical system ......
lets i explain one by one ....
2-Wire, Single-Phase System
this system is applied Outside of the United States, a variety of voltages used in this system configuration according to the standard applied in each country.
This system is different from the US "Edison System" in that only one voltage is available....
3-Wire, Single-Phase System
The 3-wire, single-phase Edison system is the only approved method of wiring singlephase systems in the United States.it has two voltages available one 120V and the second is 240V.
3-Wire, Three-Phase Delta System (Corner Ground) This system configuration is the simplest one , it normally used in the transmission of intermediate voltages from 15,000V to 600V where the neutral conductor is not used. It is also used in industrial facilities by grounding one "corner" of the System.
The corner-grounded Delta system minimize the wiring costs, and the grounded phase can be used to physically protect the other two phases from accidental grounding or lightning strikes in outdoor settings.
The disadvantage of this system is inability for distributing power to single phase loads.
4-Wire, Three-Phase "Wye" System it is the most common electrical system configuration, the ground voltage or voltage available from phase to ground is the phase voltage divided by 1.73
As with all other grounded systems, bonds are established between the grounded neutral and all components of the system. This system is recognized as the safest possible multi-purpose distribution system for low voltage (in the United States). Outside the United States, common voltages are 215v/380, 220v/400v, and 230v/415v.
4-Wire, Three-Phase Delta System
the using of this electrical system configuration is restricted by the following precautions:
1- all loads must be carefully balanced on both the single-phase and three-phase legs.
2- high leg must be color identified " usually orange" to avoid using it as a single phase source because the voltage between one leg and the grounded neutral is considerably higher than the rest of the single-phase system, high leg is located between the two lower voltage conductors.
3- don't use the "high leg" as a single-phase source because no ground or grounded neutral exists for this circuit.
please write your comment if you have any problem in above matters ....
thank you friends......
