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What is the difference between Load Current Line Current and Phase Current?
Wiki User
∙ 10y ago
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 passing through them are called 'line currents'. For a three-phase system, loads are either connected between line conductors (delta-connected system) or between each line and the neutral (star- or wye-connected system), and represent the phases -so the currents passing through the loads are called 'phase currents'.
For a balanced three-phase system, the line current is 1.732 times the value of a phase current, where the phases (loads) are connected in delta. For phases (loads) connected in star (or 'wye') the line current is numerically-equal to the phase currents.
Wiki User
∙ 10y ago
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What is the relationship between phase and line values of current and voltage quantities for star and delta connected systems?
A: A DELTA transformer is a 1:1 voltage transfer delta to Y IS 1:2 voltage transfer. That is for 3 phase system, If the phases are not exactly matched or the voltage is not exactly right then on a Y setup there will be circulating current at the common node.
Why wattmeter measure the active power?
The wattmeter contains two coils one is current coil and other is pressure coil.the current coil is connected in series with the line and pressure coil is connected across the supply.so, the disc links with the flux which is the resultant of these two.(resultant means consider the vector resultant), which include phase angle also.the active power P=VI(cosine of angle between v & I).there fore the wattmeter measures the active power.CommentThere is no 'disc' in a wattmeter. Furthermore, the current coil doesn't measure the load current, it measures the in-phase component of the load current.
How mayny hours difference between Italy and South Africa?
South Africa and Italy are on the same time line so there is no difference in hours between the two.
How do you draw DC load line and determine the Q point?
we should be take two point from the the graph between collector current and emitter-collector voltage.. along the horizontal line collector current is zero and emitter-collector voltage become Vcc,and along the vertical line emitter-collector voltage is zero and collector current become Vcc/RL then by this line that drow between this two point is called load line that in this line the transistor allowed to operate....
How do you calculate copper losses?
copper losses are power losses due to flow of current in the wires or resistances,if the resistance is R, current is I then copper losses are I2R. for a 3-phase system; copper losses are same but for a single line, total losses are 3I2R.
What is a line to line voltage?
In a 3 phase system, the voltage measured between any two phase is called line to line voltage.And the voltage measured between line to neutral is called phase to neutral (line to neutral) voltage.AnswerThere is no such thing as a 'phase-to-phase' or a 'phase-to-neutral' voltage. The correct terms are 'line-to-line' and 'line-to-neutral'.The voltage between any two line conductors is called a line voltage.In a three-phase, three-wire, system, the line voltage is numerically equal to the phase voltage.In a three-phase, four-wire, system, the voltage between any line conductor and the neutral conductor is called a phase voltage. The line voltage is 1.732 times larger than the phase voltage.
Why line current is greater than phase current in delta connection?
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.
What is phase current?
A phase current is the current passing through a phase, whereas a line current is the current flowing through a line.
What happens when phase to phase line is connected?
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 phase to phase, it is relative to the other phase. By Fourier Analysis, the difference between two phases of the same frequency, but of different phase angles, is still a sine (or cosine) wave. Also, by Kirchoff's Current Law, (implied, and I will (sort of) not repeat it here), current entering from one phase and equally leaving via another phase will not reflect at all in the neutral conductor.The simple answer is that connecting phase to phase is a short circuit, just like connecting phase to neutral.CommentThere is no such thing as 'phase to phase' or 'phase to neutral'. The correct terms are 'line to line' and 'line to neutral'.
Is the full load current rating of a 3 phase motor referring to amps per phase?
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.
How do you measure voltage in a 3 wire single phase system?
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.
What is difference between line current and phase current?
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.
How do you convert line current to 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.
What is the difference between power factor and power booster?
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 the phases more in line, effectively boosting power.
In delta connection what is formula for phase current?
Line current = 1.732 x Phase CurrentCommentOnly for balanced loads.
How can a tuned RC circuit improve the power factor of an inductive motor circuit?
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.
What is the difference between a differential circuit breaker and a circuit breaker?
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 differentthan 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 a differential breaker. When plugging let's say a hair dryer to it, the current traveling on the phase line (going into the hair dryer and out to the neutral line of the wall outlet) equals but in reverse direction of the current returned to the neutral line, thus the difference is zero. Now let's say this hair dryer got faulty and fraction of the current coming from the outlet phase line travels through your body and return to earth (considering that you are not electrically isolated from the ground). Thus the current in neutral line is less than the current on phase line; at this moment the difference is not zero and breaker opens to protect you from getting electrocuted.
