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The reactive part dissipates no power because in a reactor the current is 90 degrees out of phase with the voltage.
The effect of this is that any power that leaves the generator on one quarter-cycle comes back to the generator on the next. The net power is zero.
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What is surge impedance in power systems?
Actually surge impedance is present in a transmission line due to the capacitance of transmission line. Now this capacitor attends the reactive power of the transmission line to energise its magnetic flux. now due to the flux the impedance will increase and the power is reactive too. due to the impedance loss is more.
Why wattmeter measure the reactive power?
A watt meter will measure active power, not reactive power.
How can you reduce reactive power?
If, for example, the reactive power of a load is due to its inductance, then installing a capacitor in parallel with the load will reduce the overall reactive power.
What charectristics an electric circuit exhibit under max power transfer condition?
Max power transfer takes place when the total load impedance is equal to the source (power supply) internal impedance.
What is the effect of inductive load in distribution system?
Inductive load where current lags voltage to keep the power factor low thus increasing the consumption of more electrical units of supply provider. This is since an inductive load draws reactive power as well with active power. Reactive component is watt less power drawn from the source. We use only active part of the source. But pays from active+reactive parts. This low power factor also effects the other systems in the circuit virtually making the cables under sized by heating them
What is surge impedance in power systems?
Actually surge impedance is present in a transmission line due to the capacitance of transmission line. Now this capacitor attends the reactive power of the transmission line to energise its magnetic flux. now due to the flux the impedance will increase and the power is reactive too. due to the impedance loss is more.
Why capacitor is said to be a reactive component?
In electrical or electronic circuits, impedance can be said to have capacitive or inductive components. Capacitors cause capacitive impedance, and coils (chokes, transformers, loudspeakers, etc.) cause inductive impedance. A capacitor is said to be a reactive component in an AC circuit because it holds charge, then releases it, causing a phase shift in the output current. This phase shift in current equates to a phase shift between current and voltage. Reactive power is defined as a phase shift between current and voltage.
Reactance is not dissipate energy so why you are calculating in the account of resistance?
While reactive loads do not dissipate the reactive component of the power supply current, these currents are very real. They must be generated, and so must be taken into account when designing the generator. They also flow in the feeder conductors, cause I squared R power losses and heat, and must be taken into account when sizing the conductors.
What is VAR?
Volt-Ampere Reactive. It is the reactive component of power when the Power Factor is less than unity (1.0). It is usually measured in KVAR - 1000's of VAR.
What is the var meter?
A VAR Meter is used to measure Reactive Power in AC Circuits - Pure reactive components dissipate zero power, which makes sense in a DC circuit, as a capacitor passes no DC current and an inductor displaces no voltage. Yet, in an AC circuit, the reactive components "seem" to dissipate power, as current passes through the capacitor and the inductor sees a voltage drop. This counterfeit power is called "reactive power" and is measured not in Watts, but in VARs (Volt-Amps-Reactive). Its mathematical formula symbol is "Q". A VAR Meter is used to measure Reactive Power in AC Circuits - Pure reactive components dissipate zero power, which makes sense in a DC circuit, as a capacitor passes no DC current and an inductor displaces no voltage. Yet, in an AC circuit, the reactive components "seem" to dissipate power, as current passes through the capacitor and the inductor sees a voltage drop. This counterfeit power is called "reactive power" and is measured not in Watts, but in VARs (Volt-Amps-Reactive). Its mathematical formula symbol is "Q".
What is meant by apparent impedance?
You may be mixing up 'impedance' with 'apparent power'.Impedance is the vector sum of an a.c. load's resistance and reactance, and is expressed in ohms. Apparent power is the vector sum of true power and reactive power, and is expressed in volt amperes.Apparent power is also the product of the square of the load current and the impedance of the load.
What is the definition of natural power?
In power transmission, there is a certain amount of power where reactive power is not needed and this is natural power. For example, a network with a voltage level of 380kv and a wave impedance of 200 ohm needs 722MW power in order not to require reactive power for transmission. Formula Pnat=(voltage level)squared divided by wave impedance.
In a series RL circuit Et equals 120 volts R equals 30 ohms and XL equals 40 ohms what is the apparent power?
The apparent power (VA) is a quantity which applies to alternating current with a reactive component. It does not apply to DC and, with AC, the apparent power and real power are the same if there is only resistance present. With AC, other than just resistance there can be capacitors or inductors (coils) present. Perfect examples of these types of components do not dissipate power but do conduct current if AC voltage is applied. In your example, the resistive component is 30 ohms while the reactive impedance is 40 ohms meaning the total impedance is 50 ohms (Pythagoras). You can't just add reactance and impedance. The current through the circuit will therefore be 2.4 amps (I=V/R OR 120/50). The real or true power will be 172.8 watts ( I2 x R OR 2.42 x 30) while the apparent power will be 288 VA (2.42 x 50).
What is meant by apparent?
You may be mixing up 'impedance' with 'apparent power'.Impedance is the vector sum of an a.c. load's resistance and reactance, and is expressed in ohms. Apparent power is the vector sum of true power and reactive power, and is expressed in volt amperes.Apparent power is also the product of the square of the load current and the impedance of the load.
What kind of power is required to supply both resistive and reactive components of a load or loads?
You may be fishing for the answer "AC" or "alternating current", sinceno reactive component of power is developed in response to DC.AnswerSince true power (in watts) is associated with resistive components, and reactive power (in reactive volt amperes) is associated with reactive loads, the vector-sum of these is called apparent power (in volt amperes). So the answer you are looking for is apparent power.
What is the use of reactive power in electric circuitry?
'Reactive Power', which is expressed in reactive volt amperes, describes the rate at which energy is alternately stored (in a circuit's electric or magnetic field) and returned to the a.c. supply when the field collapses. It differs from true power, expressed in watts, because true power describes the rate at which energy is permanently lost by heat transfer due to the resistive component of the circuit.Reactive power doesn't 'have an use', per se, it's merely a way of quantifying the movement of energy in the reactive component of an a.c. circuit.The vector sum of a circuit's reactive power and its true power is called the apparent power of the circuit, expressed in volt amperes.
Why reactive power is important?
it is important b'cos,it discribes the losses of power.For caliberation we are giving more prieority to the loss in the component or a device
