0
out of three phases present one or two of them are negative and remaining +ve current flows back through negative
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Can you put one phase of a three phase ditribution board through a contactor so that the other phases stay on?
Yes, but you must have your neutral wire to form a return path for your current.
Can you hook up only 2 of the 3 phase lines to a breaker switch to use as a on off switch for 3 phase paint booth motor?
In single phase applications, you have two wires. One of these is "hot", meaning it has an AC voltage applied to it. The other is not - it is directly tied to ground or the system neutral. In three phase power, all three wires are "hot", and use the other wires as the return path under balanced conditions. Because of this you cannot do what you are proposing and have a safe setup. Isolating only two of the three wires still leaves one "hot".
What is 230 volt 3 phase?
for USA, Canada and other countries running a 60 Hz supply service.230 volt single phase refers to the two hot wires in standard house wiring but with the absence of the common return line, aka as the neutral wire.As using only the "hot" side of phase one (120 volt) and only the "hot" side of phase two (120 volt), so that these two lines yield 240 volts in phase with each other, it is called "single phase".This is sometime called 230 volts, "double phase" due to the two hot wires. Since both wires have the same phase, the term "double phase" is incorrect. As the two hots are balanced around the neutral point, "Split single phase" is the correct term to use.Typical usage examples for 240 volts split single phase include: water heaters, electric clothes dryers, water pumps for wells, central and some larger window air conditioning units, air handlers, electric heating units, floor sanders, and portable arc welders.For Europe230 V is the standard nominal voltage for single-phase electrical services to residences in Europe. It is obtained from a wye-connected, three-phase, four-wire, 400/230-V transformer secondary, by connecting between any line conductor and the neutral conductor.
Why is residential wiring called single phase if there are 2 phases coming in?
residential wiring are called single phase because the 2 phases coming in are one is neutral and the other is line.the neutral has a potential zero with ground and it is to provide a closed path for the current to flow through..the line is having a potential of 230V with the ground and a line together with a neutral is called a phase
Where do the electrons go in the common wire?
the electrons don't actually go anywhere, they move in a circular mode... the electrons bounce from one atom to another so that there is always balance... as soon as a valence electron moves to another atom another electron replaces the one just lost...
What is the return path in delta connection?
The return path in a delta connection is simply the other hot's. The three load windings are connected between AB, BC, and CA. In essence, each phase conductor is supplying power to two different phase windings. Assuming the winding currents are balanced, you can calculate the phase conductor currents by multiplying the winding currents by the square root of 3. (1.732) Its not that different from the return path for a single phase 240V appliance, such as a hot water heater, in a 120/240V split phase system. Neutral is not involved. The current flows from hot to hot.
Can you put one phase of a three phase ditribution board through a contactor so that the other phases stay on?
Yes, but you must have your neutral wire to form a return path for your current.
Why neutral is necessary in a single phase operation?
Neutral is a return path.
Do you get a shock when you touch the phase wire of single phase?
Only if you are grounded and provide a return path for the current to travel.
What is role of neutral in three phase system?
In a three phase system, connected wye, neutral is the common return, and it is grounded. In a delta connection, there is no neutral.
What is phase to ground fault?
There will a only one phase on home electricity.AnswerThere is no such thing as a phase-to-phase-to-ground fault'; the correct term is 'line-to-line-to-ground fault. It occurs when two or more line conductors make contact with each other and to ground; for example, when a JCB accidentally cuts through a three-phase cable.
What is the difference between neutral point and earthing?
Earthing point is where conductor is directly connected to ground and its potential is always zero. Neutral is a return path in single phase system and in three phase system Neutral point will have zero potential if all the loads are balanced in the system. In un balanced three phase system even neutral point will have some potential
How is the neutral point in a star connection created?
In a distribution transformer's star-connected secondary, the common point of connection is called the 'star point' and is connected to earth. The star point then provides the neutral connection for the transformer secondary, providing a return path for any unbalanced currents due to an unbalanced three-phase load.This arrangement provides a four-wire distribution system, comprising three line conductors and one neutral conductor (in addition, there are various methods of providing an earth connection to consumers). The line-to-line voltage is called a line voltage (in the UK, 400 V), while a line-to-neutral voltage is called a phase voltage (in the UK, 230 V). The line voltage being 1.732 x phase voltage.
Why neutral wire current is more in 1-phase than the 3-phase?
On a typical house plug, there are three wires - the positive, neutral, and ground. Ideally, the positive and neutral wires carry the current (the neutral wire provides the return path for the current from the positive wire), and the ground wire carries no current. In a three phase system, you have three phase voltages of the same magnitude (ideally), but the three phase voltages are out of phase with each other by 120 degrees - meaning one is at 0 degrees, one is at 120 degrees, and one is at -120 degrees if you looked at them on an oscilloscope, and referenced to one phase. If you take (1 at an angle of 0 degrees) + (1 at an angle of 120 degrees) + (1 at an angle of -120 degrees), you will get zero. Thus the return path in three phase power is shared between the three phases, and the neutral wire in a 4 wire, three phase system is equivalent to the ground wire connected to your wall plug. The ground wire will only carry current when the "vector sum of the phase voltages does not equal zero" (meaning the simple equation at the beginning of this paragraph does not sum to zero - whatever it sums to is what is flowing in the neutral).
What is the relation between the path difference and phase difference?
Relation between phase difference and path difference is path difference/wavelength=phase difference/2*pi
Can you hook up only 2 of the 3 phase lines to a breaker switch to use as a on off switch for 3 phase paint booth motor?
In single phase applications, you have two wires. One of these is "hot", meaning it has an AC voltage applied to it. The other is not - it is directly tied to ground or the system neutral. In three phase power, all three wires are "hot", and use the other wires as the return path under balanced conditions. Because of this you cannot do what you are proposing and have a safe setup. Isolating only two of the three wires still leaves one "hot".
When was The Path of Return Trilogy created?
The Path of Return Trilogy was created in 2009.
