What is difference between line current and phase current?
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 phase current.
In a the case of a balanced delta connected load, the line current is 1.732 greater than the phase current.
'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. 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. 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. Read More
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). Read More
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
What is the current difference in a 3 phase motor running continuously in star connection and delta connections?
The voltage difference between star and delta is 1.732, the square root of 3, or, going from delta to star, 1 over 1.732, which is 0.5774. That is the same as the current difference, neglecting motor efficiency at the two different operating voltages. The power difference between star and delta is 1.7322, or 3, and between delta and star is 0.57742, or 0.3333. <<>> In a wye connection, the line current is equal to the… Read More
In a three-phase system, a line voltage is the voltage measured between any pair of line conductors. The line current is the current flowing in any of the lines. Line voltages are usually numerically equal when measured between any pair of lines. Each line current, however, may be different if the load is unbalanced, or the same if the load is balanced. In a residence, the line voltage is the voltage between the incoming line… Read More
IT depends upon the 3-phase connnection ..if it is Y connection:line current = phase current if it is delta connection: IL=(root 3)IPh 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. 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
If there is a voltage differential from phase to phase, and a conductance (inverse of resistance) between them, then current (amperes) flows. This is no different than phase to neutral, i.e. voltage across conductance generates current, (I = EC, or I = E/A) except that neutral current is zero in a true phase to phase connection. Note that phase angle is always relative. In phase to neutral, it is relative to (typically) neutral; while in… Read More
NO, ONLY ONE. If you are measuring line current. The purpose of the line to line measurement is to know if your load is drawing balance ampere and slight difference is negligle. Read More
A circuit breaker is a device that opens its contacts in order to open the circuit in case of current overload. A differential circuit breaker is a device that opens the circuit in case of leakage (current measured on the phase line is different than the current returned to neutral line); therefore protects users from electric shocks. To more understand how it operates, consider the following: Say that your electrical wall outlet is connected to… Read More
Power factor is well defined and measures the difference between the phase of current and voltage. It varies from 1 to zero with 1 being associated with a pure resistive load. Since you multiply voltage times current to compute instantaneous power; if they are out of phase then you get reduced power. A power booster, in this context, would be a device that was designed to compensate for the our of phase situation and bring… Read More
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. Read More
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
How can I check my balance on Line Read More
The RC circuit can reduce the phase shift between the voltage and current in the power line. The phase shift is caused by the inductance of the motor. The phase shift between the voltage and current in the power line causes problems due to the presence of so called imaginary current or power that does no work but must be supplied by the power source. Read More
They are identical. Read More
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
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). Read More
line transformation ratio would be the turns ratio (ie voltage ratio), while the phase transformation ratio is most probably the phase shift introduced by a 3 phase transformer. Read More
The difference between a single and a three phase online UPS is a 3 phase can supply a 100% unbalanced load on its output without affecting its performance. A single phase cannot supply a 100% unbalanced load on the output without affecting its performance. Read More
The main difference between star and delta is that in star, the phase voltage is root 3 multiplied by the line voltage making the speed of the machine to run at low speed while in delta, the phase voltage is equal to the line voltage making the machine to run at high speed. Read More
in safe systems the summation of every phase currents is equale to the line current,but in deffect system not equale , this difrance circulates between parallel phases Read More
A connection can be taken between phase lines, or between one phase and neutral. Both methods give a single-phase supply. Between phases the voltage is sqrt(3) times more than between one phase and neutral. In each case the load gives an unbalanced current on the 3-phase system but the idea is to average out the unbalances over a group of single-phase loads. Read More
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. Read More
The difference between a dc load line and an ac load line is the source of the electricity. A dc load line is coming from a battery and an ac load line is through a direct electrical current. Read More
star connection like y whle delta connection like a triangle. in star connection there is adifference between line voltage and phase voltagewhi delta connection line voltage and phase voltage are same. in star connectin line voltage is always greater than phase voltage Read More
normally delta connection wired in 3 phase induction motor. during starting wiring is in Star and after running normal speed changeover to delta .beacause starting time its phase voltage equals less root3 times of line voltage ,line current and phase current equals. in Delta phase voltage and line voltage equals, and phase current equals root3 times line current Read More
In the case of a delta connection, measuring phase current is relatively difficult, as access to the phases of most loads (e.g. motors) for the purpose of inserting an ammeter is not very practical. In the case of a star (wye) connected system, of course, it is relatively easy because the phase current is exactly the same as the line current. And line currents can be read very easily because the line conductors are accessible… Read More
If you are referring to an alternating current system, then a phase describes a winding, or a load, that is connected between any two line conductors in a delta-connected system, or between any line and the neutral conductor in a wye-connected system. Read More
The three 'hot' conductors supplying electricity to a three-phase load are called LINES, not 'phases' (although unfortunately the term 'phase' is widely, but incorrectly, used in the field). Phases exist between line and neutral in star, or wye, connected systems, and between lines in a delta, or mesh, connected system. Accordingly, the term 'phase to phase' is quite meaningless. A line voltage, therefore, exists between any two lines. For a star (wye) connected system, a… Read More
For a transformer, the turns ratio always applies between its primary and secondary windings. So the turns ratio for a three-phase transformer is the ratio of primary to secondary phase voltages, not between line voltages. 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. Read More
For a three-phase, three-wire, system, the line voltage and the phase voltage are numerically equal to each other, and both are measured between any pair of line conductors. For a three-phase, four-wire, system, the line voltage is 1.732 times the phase voltage. The line voltage is measured between any pair of line conductors, whereas the phase voltage is measured between any line conductor and the neutral conductor. Read More
There is no such thing as a 'phase-to-phase' voltage. The correct term is 'line-to-line' voltage or 'line voltage'. For a star (wye) connected system, the line voltage is 1.732 times the phase voltage, where the phase voltage is measured between any line and neutral. Read More
Marc Jacobs is the designer,and Marc is his current fashion line. Read More
There is no such thing as 3 phase to a DC motor. DC is direct current and is totally different from AC. 3 phase only exists in AC or Alternating Current Read More
To get KW, multiply KVA by the power factor (cosine of the phase angle between voltage and current on the line). Read More
A single phase supply can be obtained between any pair of line conductors or between a line conductor and a neutral conductor. Read More
Wavefront: A line (crest of the wave) in which all the points along it are in phase Wavelength: the distance between two adjacent points that are in phase Read More
A three-phase, four-wire, system consists of three 'hot' conductors which are called line conductors, and a neutral conductor, sourced from a wye (or 'star') connected alternator or transformer. For this type of system, line voltages exist between line conductors, and phase voltages exist between any line conductor and the neutral conductor. A three-phase, three-wire, system consists of three 'hot' conductors which are called line conductors, sourced from a delta (or 'mesh') connected alternator or transformer… Read More
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 Read More
For a three-phase, four-wire, system, the line voltage is measured between any pair of line conductors, while the phase voltage is measured between any line conductor and the neutral conductor. For a three-phase, four-wire, system, the line voltage is numerically-equal to the phase voltage, and both are measured between any pair of line conductors. Read More
For residential supplies, the nominal voltage between a line and neutral is 230 V (in Europe) or 120 V (in North America). Read More
KVA means product of voltage and current. For 3 phase generator, its KVA = (1.732 X (Line Voltage) X Current)/1000. Put line voltage in this equation and get current. Read More
There is no such thing as a 'phase-to-phase' voltage; the correct term is 'line-to-line' voltage. Whenever you mention a value of voltage for a three phase system, it is considered to be a line-to-line voltage unless it is stated clearly that this is phase voltage (line to neutral) voltage. (The reason that there is no such thing as a 'phase-to-phase' voltage is because phases exist between, or 'across', line conductors or between a line conductor… Read More
A phase current is the current passing through a phase, whereas a line current is the current flowing through a line. In the case of a balanced delta-connected load, IL = 1.732 IP. In the case of a balanced star-connected load, IL = IP. For unbalanced loads, these relationships don't hold true, and must be individually calculated. Read More