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What if the fourth wire in a three phase is having impedance would the current in the neutral line remain to have a value of zero?
Wiki User
∙ 10y ago
When the system is in balance, with three equal phase currents, there is no current in the neutral 4th wire and it is not needed. However if the load is unbalanced, the neutral is needed to maintain the star point at zero volts.
So for example a street of houses fed by a 3-phase supply needs a neutral because the houses draw unequal currents from the different phase lines, although a large enough collection of houses would tend to balance itself out.
If a three-pase system has equal currents the current in the neutral is zero. If two phases draw equal current but the third has no load, there is an equal current in the neutral, and if one phase draws current but the other two have no load, there is again an equal current in the neutral.
ANOTHER ANSWER
A three-phase, four-wire, system comprises three line conductors and a neutral conductor. If the load supplied by this system is balanced (i.e. the loads connected between each line and neutral are identical in all respects), then no current will flow in the neutral conductor regardless of its impedance. If the load is unbalanced, then a neutral current will flow in the neutral conductor. In other words, the impedance of the neutral conductor plays no part in whether or not there is a neutral current.
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∙ 10y ago
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Is instead of neutral wire can you ground it by putting the wire in to earth if yes then why is extra wire used for neutral by eleminating netrual wire cost of transmission can be reduced?
Transmission lines do not use a neutral conductor, so your question isn't actually relevant. Neutral wires are only necessary where imbalance may be large, and under some conditions current may be flowing in the neutral. Under these conditions a low impedance path (the neutral wire) is more desireable than a high impedance path (the ground). In many overhead transmission lines, a fourth or fifth wire are placed above the current carrying conductors; these are shield wires (not neutral wires) and are used to minimize outages on the line due to lightning (the lightning will strike these instead of the phase wires, these will flash over to the structures and the energy will be shorted to ground without the line having to be removed from service). When you're dealing with things that cost ~$100,000 - 2M/mile, it may be worth the added expense of a shield wire to keep it in service as much as possible.
What is dynamic impedance?
The impedance of a circuit having an inductance and a capacitance in parallel at the frequency at which this impedance has a maximum value. Also known as rejector impedance.
How you can eliminate loading effect in amplifiers?
By increasing the input impedance of amplifier.
What is the purpose of having a low impedance for transmission lines?
in order to reduce the transmission line losses we need low impedance...Low impedance also improves power transfer capacity of the line..
Can you bank three single phase transformers in a delta to grounded wye with one transformer having a different impedance?
yes
What is the impedance of a single phase inductive circuit having a voltage of 240volts and a current flow of 10amps?
Work it out for yourself. The equation is: Z = E/I, where Z is the impedance, E is the supply voltage, and I is the load current.
Is instead of neutral wire can you ground it by putting the wire in to earth if yes then why is extra wire used for neutral by eleminating netrual wire cost of transmission can be reduced?
Transmission lines do not use a neutral conductor, so your question isn't actually relevant. Neutral wires are only necessary where imbalance may be large, and under some conditions current may be flowing in the neutral. Under these conditions a low impedance path (the neutral wire) is more desireable than a high impedance path (the ground). In many overhead transmission lines, a fourth or fifth wire are placed above the current carrying conductors; these are shield wires (not neutral wires) and are used to minimize outages on the line due to lightning (the lightning will strike these instead of the phase wires, these will flash over to the structures and the energy will be shorted to ground without the line having to be removed from service). When you're dealing with things that cost ~$100,000 - 2M/mile, it may be worth the added expense of a shield wire to keep it in service as much as possible.
What are the applications of CB configuration?
the CB configutration is having low impedance & hence used in I-V converters(current -voltage converters)
What is dynamic impedance?
The impedance of a circuit having an inductance and a capacitance in parallel at the frequency at which this impedance has a maximum value. Also known as rejector impedance.
How you can eliminate loading effect in amplifiers?
By increasing the input impedance of amplifier.
What is the voltage if the current is 10Ampere?
Basic Ohm's law.... V = I x RMultiply the current (10 Ampere) by the resistance (or impedance) of the load to get the voltage.Comment:You cannot work out the value of the voltage by simply having the value of the current. V=I x R Or V=P/I
What is the Difference between image impedance and iterative impedance?
iterative impedance is a particular value of the load impedance that can be found which will produce an input impedance having the same value as the load impedance.When connected at one end of the port produces an equal impedance when looking at the other. Image impedance-Two impedance's of two port network,which will terminate the port simultaneously in a way that, at each port the impedance seen in both directions are equal.
What is the purpose of having a low impedance for transmission lines?
in order to reduce the transmission line losses we need low impedance...Low impedance also improves power transfer capacity of the line..
How you can minimize the loading effect on voltmeter?
Loading refers to the phenomena that occurs when a load circuit having low effective impedance is connected to a supply circuit having higher effective impedance.
What are the advantages of buffer?
Buffers are very useful as impedance matching circuits and as current boosters.They have i/p and o/p voltages same. However they amplify the current. Also they can be used to couple two circuits having different o/p and i/p impedances
Is the neutral conductor a live wire?
YES. ACTUALLY THE SIZE OF NEUTRAL BUSBAR IS BIGGER THAN THE PHASE CURRENT IF ALL THE LOADS IN A 3 PHASE PANELBOARD ARE ALL SINGLE PHASE. In single-phase, which is found in homes, when an appliance is operating, the amps (current) will be equal in the "hot leg" and the neutral. So current IS passing through the neutral wire. In 3-Phase, which is found in a lot of commersial and industrial buildings (including schools), very little current will exist in the neutral IF the current load is BALANCED EQUALLY between the 3 phases. At any given time, however, it is almost impossible to balance the current exactly. So current, even a small amount, will probably exist in the neutral wire. Most certainly enough to harm or kill you! Be it at home, or at work, when the lamp at your desk or by your bed is on, current is flowing through BOTH of the lamp wires!
Amp meters how do they work?
A current probe, or current clamp, is a device having jaws which allows clamping around an electrical conductor, measuring the current without touching the conducting material. This measurements comes from a second current generated by the magnetic field created from the first electrical current.
