In terms of electrical engineering, what is 3 phase and line to line? what is delta and star connection?

Answer 1

Various electrical power setups, change, and grounding.

Answer 2

Three phase power generates 3 voltages out of phase by 120 degrees. This is important because the instantaneous power (sum of the 3 phases) is constant. In a single phase device, the instantaneous power goes up and down (it is 0 when the voltage crosses 0).

You can have 3 phase with or without a neutral. Most high voltage transmission has no neutral, which is why you'll see 3 wires on the poles (phase or line conductors). Local distribution generally has a neutral and single phase transformers for homes are generally connected phase to neutral. The line to line (or phase to phase) voltage is 1.73 (square root of 3) times the line to neutral voltage. The line to line voltage is what is specified. A utility line might be 13.8 kV. This is line to line. The line to neutral voltage is just under 8kV (which would be the primary side of transformers for homes).

Connections of 3 phase transformers or motors can be either delta or wye (star) connected. Delta puts the 3 windings with each connected between two phases, which can be drawn like a triangle. The Wye connection has each winding connected between a line and the neutral, and can be drawn like the letter Y. In the case of a motor, this neutral is an internal connection only, and the motor will still have just 3 wires for power. If it is a transformer, the neutral should be connected to the source unless the load on the transformer is balanced between phases. The primary and secondary of a transformer can each be either delta or wye connected.

Answer 3

A 3 phase system is an electrical system wherein Power is delivered in three (3) different poles and they are 120 electrical degrees out of phase. They are commonly designated as phase A, B and C and is usually measured line to neutral.

Line to line refers to an electrical parameter (voltage or current) measured between different phases or poles (i.e. between phase A and B, or between phase B and C, or between phase A and C).

Delta connected system is a connection (for motors and/or transformer) that forms a three-sided windings. While a star connected (or wye) system is a connection wherein windings form a neutral point.

Answer 4

Do you know or do you want to know.

3 phase has to do with 3 different lines used together to create 125% of the power of the 3 combined...I think.

I can't remember all of this stuff, but I have a question for you.

In an open Delta connection, what is the most common current...?


208V.

Answer 5

you know one phase means .so i directly go to 3 phase .it contains 4 lines one is a null and the other free have the same magnitude but a difference of 120 degrees in phase. i hope you know phasors. line to line voltage is used in three phase systems and means the difference between their voltages.It's magnitude is 3^(1/2) * the magnitude of their voltage difference to null . imagine you have phree loads connect one side of all three loads together and their other end to each phase it's a star connection. if you put these three loads between 3 phase and use the line to line voltage u have delta connection thats so easy.

Answer 6

as a results of fact of ways the transformer windings delta or celebrity connection is bodily set up. whilst connecting 2 of the ends on a delta (2 of the section windings) you get a million.732 situations the quantity of voltage you get in case you have been to connect between the section winding or one in all them in know to the floor. Connecting 2 of the stages (even although the windings could be two times the quantity concerning the floor) the quantity of voltage isn't double as a results of fact each and each section is 30 stages out of section. so as a replace you get a million.732 situations the quantity of the voltage of the voltage know to the floor.

Answer 7

Please read:
http://www.windstuffnow.com/main/3_phase_basics.htm