How do you convert line current to three phase current?
The current is the same in the three live wires. The voltage can be described as the line voltage (phase to neutral) or the phase voltage (phase to phase) which is larger by a factor of sqrt(3).
So a line voltage of 230 v corresponds to a phase voltage of 400 v.
Impossible. 25KVA is a power measurement. To convert to amps, you must have voltage. In the case of three phase: P = Voltage * current * sqrt(3) (assuming voltage is line to line) The current in the equation is phase current, thus the current calculated above will flow in all three branches, and will be 120 degrees out of phase with the other phases.
If the 3 phase service has a 4th wire (neutral), then yes, just connect one of the three phase wires and neutral for a single phase circuit.
A 'phase current' is the name given to the current in a phase and a 'line current' is the name given to the current in a line. 'Lines' are the conductors that connect a three-phase load to a three-phase supply. 'Phases' are the individual windings in a machine, or the individual impedances that make up a three-phase load. In the case of a star (wye) connected load, the line current is numerically equal to the… Read More
in three phase you have lost more Answer For a given (balanced) load, the line current in a three-phase system is lower than for a single-phase system by a factor of 1.732 and, since line losses are proportional to the square of the line current, three-phase systems have lower line losses than a corresponding single-phase system.
Your question should read, 'How do you convert three-phase to single-phase?' Single-phase can be obtained by connecting a single-phase load between any two of the three line conductors, or between any line conductor and the neutral conductor -depending on the level of voltage you require. There is no conversion necessary, any two legs of a three phase system will give you single phase. Take a 3 phase 208 volt grounded wye system. Any two of… Read More
What is the relationship between line current and phase current in a three phase star connected system?
The line current is exactly equal to the corresponding phase current, in a star-connected system, because it is the same current.
given a balance three phase, three wires system with star-connected load for which lime voltage is 230v and the impedance of each phase is (6+j8)ohm. find the line current and power absorbed by each phase.
Sqrt(3). Line current is 1.73 times phase current. Answer Line currents occur in the three lines (the conductors that connect the supply to the load). Phase currents occur in the phases (i.e. in the three individual loads, or in the three armature windings of the supply generator). For a balanced wye-connected load, the line currents are numerically-equal to the phase currents. For a balanced delta-connected load, the line currents are 1.732 times the phase currents.
How do you calculate the amps of a three phase generator from the amps of the three single phase of the generator?
In three-phase systems, we have to measure the current in each of the three line conductors individually. There is no 'overall' current for a three-phase system. So if you know the current in each phase, then that's it! There's nothing else to calculate.
A load current is a current drawn by an electrical load. In other words, it is the current flowing from the source to the load. For a single-phase system, a line current is a current flowing through the line, or 'hot', conductor, while the current through the neutral conductor is called the neutral current. For a three-phase system, the three 'hot' conductors between the load and the source are called 'lines' and, so, the currents… Read More
On a delta system the line current would be 1.732 times higher than the phase current. In a Wye system the line current and phase current are the same. In a parallel circuit (Delta) current divides. In a series circuit (Wye) current stays the same. Another Answer Line currents pass through line conductors, whereas phase currents pass through phases. 'Phases' are (in the case of a supply) are the windings of a three-phase alternator or… Read More
Three phase output means three single phase outputs, so to "convert" three phase output to single phase, simply use just one phase or two phases depending on what voltage is supplied and what voltage you want. For example, a 120/208V three phase generator will give you 120V single phase-to-neutral or 208V single-phase (line-to-line) using one or two phases respectively.
Insert an ammeter into one of the three line conductors. As a three-phase motor is a balanced load, then the current in each line will be the same value.
The phase voltages (i.e. line-to-neutral in a 4-wire system, or line-to-line in a 3-wire system) of a three-phase system are displaced from each other by 120 electrical degrees. Each phase voltage, in fact, is rarely in phase with its phase current, as the phase-angle (the angle by which a phase current lags or leads its phase voltage) is determined by the load not by the supply. In general, most loads are resistive-inductive so the phase… Read More
Negative sequence current is defined as 3I2 = (phase 1)*(1angle 0) + (phase 2)*(1angle 240) + (phase 3)*(1angle 120) Negative sequence current is seen in three phase power systems due to natural system imbalance. Also during unbalanced fault conditions such as line to line, Line to ground, and line to line to ground faults. It is not seen in purely balanced three phase faults.
For a three-phase, four-wire, system the neutral current is the phasor (vector) sum of the three line currents.
The apparent power (expressed in volt amperes) of a balanced three-phase load is the product of 1.732, the line voltage, and line current: Apparent Power = 1.732 EL IL By changing the subject of this equation, you'll be able to calculate the line currents. Incidentally, the symbol for kilovolt ampere is kV.A, not 'kva'.
In a balanced 3-phase system, if the three loads are star connected, the line current is equal to the load current. If the loads are delta connected, the line current is less than the load current by a factor of 1/sqrt(3).
If I have 1 KW In 3 Phase it will give 1.54 A and In single phase it will give 4.6 A For cosF 0.9 V 415 3 ph V 240 1 ph It seems the reason is because the current is carried on more wires. Also, remember that if wattage stays constant, then as voltage increases, current decreases. Answer It really depends on the load. Are you assumining the three-phase load to be the… Read More
You can't. Currents in three-phase systems are measured in each of the individual line conductors.
A phase current is the current passing through a phase, whereas a line current is the current flowing through a line.
You don't need to 'convert' three phase to single phase! A single-phase supply is obtained between any line conductor and the neutral conductor, or between any pair of line conductors -the choice depends on the voltage requirements.
How do you calculate the total input current from a 3-phase power source when the current from each phase is known?
Add them up Answer There is no 'total' current in a three-phase system. The current flowing in each line (not 'phase') is considered separately. And you most definitely don't 'add them up'!
'Line currents' are those currents flowing in the line conductors, whereas 'phase currents' are those currents flowing in the phases. Each line current is the phasor sum of the phase currents at the junction between a line and two phases. For a balanced load, the line current is 1.732 times the phase current.
yes just pick any one of the 3 Answer A three-phase system is either a three-wire system (comprising three line conductors) or a four-wire system (comprising three line conductors and a neutral conductor). To obtain a single-phase supply, the load can either be connected between any pair of line conductors or between any line conductor and a neutral conductor.
A two-phase system is an archaic system, in which two voltages are generated ninety electrical degrees apart. For a two-phase, three-wire, system the line voltage is 1.414 times the value of the phase voltage. This system has been long replaced by a three-phase system, in which three voltages are generated 120 electrical degrees apart. You cannot, therefore, convert a three-phase system to a two-phase system.
Mathematically, just divide 480 by the square root of three. Electrically, 480V refers to the line-to-line value of a three phase system. For example, measure the voltage across A-phase and B-phase and you'll get 480V. 277V is the line-to-neutral value. Measure the voltage across A-phase and the neutral conductor and you should get 277V.
Line, phase, neutral are terms used to describe the conductors in a three-phase system. The three live wires are called 'lines', and less correctly, 'phases'. Neutral is used for the fourth wire which in a balanced system carries no current.
A 7.5 kW three phase load will be balanced by the manufacturer. When connected to a three phase source the line current on each phase will be equal.
To get KW, multiply KVA by the power factor (cosine of the phase angle between voltage and current on the line).
Balanced Star (Wye) Connected Systems: Line Voltage = 1.732 x Phase Voltage Line Current = Phase Current Balanced Delta Connected Systems: Line Voltage = Phase Voltage Line Current = 1.732 x Phase Current
A smaller neutral wire in a three phase system can be used because it does not carry the full line current. It carries the unbalanced current of all three leg loads. This is one reason that three phase loads on a distribution panel should be equalized as much as possible to reduce the current on the neutral.
in neutral wire is current carrying imbalance load,or load is not proparly handle by live wire,in case earthing resistance high compare with load equipment. Answer For a single-phase system, the neutral conductor carries exactly the same current as the line conductor. For a three-phase system, the neutral conductor carries the phasor-sum of the three line currents; for a balanced three-phase load, the phasor sum of the line currents is zero.
Power stations generators are three-phase machines as, for any given load, three-phase transmission/distribution systems are less expensive in terms of the amount of copper (i.e. size and number of conductors) than a corresponding single-phase system. Three-phase systems are either three-wire systems or four-wire systems. Three-wire systems utilise three line-conductors, whereas four-wire systems utilise three line conductors and a neutral conductor. To obtain a single-phase supply (and, therefore, what you refer to as a 'single-phase current')… Read More
There is no such thing as a 'total current' for a three-phase generator in the sense that you suggest -i.e. the sum of the phase currents. Current ratings are based the current that the machine can deliver to a load on a 'per line' basis.
A single-phase supply is obtained between any two line conductors or between a line and neutral conductor of a three-phase supply. To obtain a three-phase supply from a single-phase source is far more difficult, and requires additional equipment.
The terms 'phase voltages' and 'phase currents' are used in three-phase alternating-current systems, to distinguish them between 'line voltages' and 'line currents'. In a three-phase system, the generator has three coils which generate voltages that are displaced from each other by 120 electrical degrees. The generator is then connected to the load using three conductors, called line conductors. The generator's three coils are described as 'phases', and the generated voltages are called 'phase voltages', while… Read More
Because if you apply Kirchhoff's Current Law to the junction between the line current and the two phase currents, the line current is the phasor (vector) sum of two phase currents. For a balanced load (only), this works out to 1.732 x phase current.
Would only one wattmeter be needed to measure the total three-phase power on a balanced three-phase four-wire system?
Yes. The wattmeter's current coil will have to be connected into one of the line conductors, and its voltage coil between that same line conductor and the neutral point of the load. Connected this way, the wattmeter's voltage coil is measuring one of the three phase voltages (line-to-neutral voltage) while its current coil is measuring the corresponding phase current (for a 4-wire system, the phase current = line current). The power factor (cosine of the… Read More
1.73 (the square-root of 3) is the ratio of line voltage to phase voltage in a star (wye) three-phase connection, and is the ratio of line to phase current ratio in a delta three-phase connection supplying a balanced load. In each case, it is derived from the phasor addition of two values displaced from each other by 120 electrical degrees.
How you can calculate current of a load when you have three phase supply with 237 volts328.4 KW Power and 0.99 cosfi?
The general equation for power in a BALANCED three-phase load is as follows: P = EL IL x power factor ...where EL and IL are the line voltage and line current, respectively. So all you have to do is to manipulate the equation to make the line current the subject, and insert your figures.
the difference between the two line currents - anything from zero (no neutral current ) if perfectly balanced or only line-to line loads up to the entire line current if completely unbalanced (all current on one line and neutral, no current in other line).
A three-phase motor is supplied by three 'hot' conductors, called 'line conductors'. The voltage between any pair of these conductors is called a 'line voltage', and the current flowing through each one is called a 'line current'. The '10 A', you refer to in the question is a line current. In other words, it is the value of current flowing through each of the three line conductors. You cannot add them together, as they are… Read More
First of all: 'line' and 'phase'. The conductors that connect a three-phase load to a three-phase supply are called 'line conductors' or, simply, 'lines'. The individual three-phase loads are 'phases'. So voltages measured between line conductors are called 'line voltages' whereas voltages measured across phases (individual loads) are called 'phase voltages'. THERE IS SIMPLY NO SUCH THING AS A 'PHASE-TO-PHASE' VOLTAGES. Similarly, currents passing along line conductors are called 'line currents', whereas currents passing through… Read More
kVA / (kV*sqrt(3)), where kV is the line to line voltage.
Electricity generation, transmission, and distribution systems are all three-phase systems. Three-phase alternating current is generated by alternators with three sets of coils, physically displaced by 120 degrees which, therefore, produce three separate voltages, which are displaced from each other by 120 electrical degrees. There are three-phase, three-wire systems, which comprise three conductors, called 'line conductors', whose potentials are displaced by 120 electrical degrees. There are also three-phase, four-wire, systems which comprise three line conductors and… Read More
Any two legs of a three phase system can be classed as a single phase supply. Alternative Answer As the above answer points out, connecting a load between any two line conductors of a three-phase supply will give you a single-phase load. But you must, of course, take into account the voltage rating of the load you wish to connect. In Europe, three-phase low-voltage distribution is normally by means of a four-wire system, comprising three… Read More
A 415 v three phase system has a line-to neutral voltage of 240 v on each of the three phase wires. Each wire supplies 250,000/3 or 83,333 VA so the current is 83,333 / 240 or 347 amps. The current in each live wire is 347 amps. If a balanced load was delta-connected to it, the load current would be 200 amps at 415 volts. Another Answer I suspect that you are really asking what… Read More
The line current would be the same if the motor were connected in delta. The current can be based on the rule of thumb which says 7 amps must be allowed for a 1-HP single-phase motor on 240 v. A 2.2 kW motor is three times as powerful, and on a three-phase supply of the same voltage (240/415) it would draw 7 amps.
For single phase, KVA = (line to ground) * (phase current). A 75kVA 480 to 208Y/120 volt transformer is a fairly common transformer. I assume this is the type of transformer you are referring to. 75k / 120 = 625 Amps. As an FYI, the 208Y voltage is the line to line voltage, which is equal to (phase 1) - (phase 2), where the phases are separated by 120 degrees, thus (phase 1) * 1.732… Read More