FizixFreak said:i was reading three phase ac supply and this statement is quite confusing ''because of the 120 degrees phase shift the voltage across any two lines is 400 volts (the voltage across each of the lines connected to the terminals is 230 volts)
can anybody please explain it??
Asok said:the line voltage is the voltage "difference" of two phase voltages... that means one phase voltage should be reversed and added to another phase.. than u'll have 2x230xcos(30) as the line voltage ([tex]\approx[/tex]400)... (check for the attachment, then u'll get a better idea)
A three-phase A.C supply is an electrical power supply that consists of three alternating currents that are 120 degrees out of phase with each other, typically designated as phases A, B, and C. This type of supply is commonly used in industrial and commercial settings due to its efficiency and ability to power large loads.
A three-phase A.C supply works by using three separate power lines, each carrying a different phase of the alternating current. These phases are offset by 120 degrees, which creates a more constant flow of electricity compared to a single-phase supply. The three phases work together to power motors and other electrical equipment efficiently.
There are several advantages to using a three-phase A.C supply. Firstly, it is more efficient than a single-phase supply, allowing for the use of smaller and lighter wires to transmit the same amount of power. It also results in smoother and more constant power output, making it ideal for powering large motors and equipment. Additionally, three-phase A.C supply is more reliable and has a higher power capacity compared to single-phase supply.
The main difference between a three-phase A.C supply and a single-phase supply is the number of alternating currents. A single-phase supply has only one alternating current, while a three-phase supply has three alternating currents. This results in a more efficient and constant power output in a three-phase supply, making it ideal for industrial and commercial use.
A three-phase A.C supply is commonly used in industrial and commercial settings for powering large motors, pumps, compressors, and other heavy machinery. It is also used in power transmission and distribution systems, as well as in renewable energy sources such as wind and solar power. Additionally, three-phase A.C supply is used in some residential buildings for high-power appliances such as air conditioners and electric stoves.