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Why can a reactive power load drop the voltage more than the active power load in a transmission line?
A load with a poor power factor draws extra current from the power supply, meaning that there will be more of a voltage-drop in the supply.
As an example, if the load is 6 kW on a 240 v supply, the current drawn is 25 amps if the load has a power factor of 1. The kVA is equal to the kW.
But if the load has a power factor of 0.8 it needs to draw 7.5 kVA for a power of 6 kW, which is a current of 31.25 amps, so there is more of a demand on the power supply wiring etc. The transmission losses increase by 56% with the extra current.
In both cases the customer is charged for power used, 6 kW. That is why the supply companies do not like loads with a poor power factor and sometimes charge commercial customers more for a poor power factor.
That in turn makes it viable for the customers to correct the power factor of the load they place on the supply.
What else can I help you with?
Is there any active or reactive power in dc current?
Active, yes; reactive, no.
What is mean by compensated and uncompensated power transmission line?
Power transmissions lines are inductive by nature. Power in AC systems is transmitted by varying the phase angle between source and receiving end following the below equation: Vsource * Vrecieve * sin (phi) / (Zsource + Zrecieve + Zline) V = the voltage phi = angle between source and receiving end voltage Z = impedance, Zsource = the impedance behind the source end Series compensating lines is accomplished by adding capacitors in series on a line, which reduces the Zline term in the above equation. This allows more power to be transmitted from one end to the other.
Relation between active power plus reactive power plus apparent power?
Apparent Power=Active Power+Reactive Power or Active Power=VI Cos(Phase Angle) Reactive Power=VI Sin(Phase Angle) Apparent Power= VI
What are advantages of reactive power?
Real power is power that is used to do work. This is the power a light bulb uses to glow. Reactive power is power that is stored in one part of the AC voltage wave, and released in another. This causes the power to appear as a phase shift, and is generally caused by inductive or capactive loads. With regard to the power system, you can also get reactive power flowing due to unequal source voltages. Under these conditions, the apparent impedance of one source to the other will appear reactive/inductive, resulting in reactive power flow.
What happens if reactive power enters the system?
Reactive power entering the system will increase the system voltage.
Which line requires compensation?
Basically an AC transmission line require compensation in terms of reactive power. To push the active power across a transmission line certain amount of reactive power is necessary. In AC transmission line reactive power is generated and consumed. Generator is responsible for the production of reactive and active power both. Than this reactive power is consumed by the load and transmission line. Additional reactive power s supplied by the capacitor. This extra power supplied by the capacitor is termed as reactive power compensation. Requirement of this reactive power is there because reactive power is necessary to maintain the voltage stability.
What is the importance of reactive power in transmission lines?
Reactive power is the electrical power that oscillate between the magnetic field of an inductor and the electric filed of the capacitor. Reactive Power Cannot Converts to non-electrical power e.g. heat, light & torque. Instantaneous reactive power equal to the multiplication instantaneous current, instantaneous voltage and the sinusoidal of phase difference of current & voltage. It only present in ac power if there is any phase difference between instantaneous current and instantaneous voltage. During complete cycle average reactive power is zero. Active power is the energy supplied to run a motor, heat a home, or illuminate an electric light bulb.Reactive power provides the important function of regulating voltage. If voltage on the system is not high enough, active power cannot be supplied. Reactive power is used to provide the voltage levels necessary for active power to do useful work. Reactive power is essential to move active power through the transmission and distribution system to the customer .Reactive power is required to maintain the voltage to deliver active power (watts) through transmision lines. When there is not enough reactive power, the voltage sags down and it is not possible to push the power demanded by loads through the lines.
How reactive power is used?
Reactive power (VARS) is required to maintain the voltage to deliver active power (watts) through transmission lines.Motor loads and other loads require reactive power to convert the flow of electrons into useful work.When there is not enough reactive power, the voltage sags down and it is not possible to push the power demanded by loads through the lines.
Is there any active or reactive power in dc current?
Active, yes; reactive, no.
What is mean by compensated and uncompensated power transmission line?
Power transmissions lines are inductive by nature. Power in AC systems is transmitted by varying the phase angle between source and receiving end following the below equation: Vsource * Vrecieve * sin (phi) / (Zsource + Zrecieve + Zline) V = the voltage phi = angle between source and receiving end voltage Z = impedance, Zsource = the impedance behind the source end Series compensating lines is accomplished by adding capacitors in series on a line, which reduces the Zline term in the above equation. This allows more power to be transmitted from one end to the other.
Relation between active power plus reactive power plus apparent power?
Apparent Power=Active Power+Reactive Power or Active Power=VI Cos(Phase Angle) Reactive Power=VI Sin(Phase Angle) Apparent Power= VI
Why wattmeter measure the reactive power?
A watt meter will measure active power, not reactive power.
Descibe about shunt reactors?
Shunt reactors are the inductors connected across the power line for power factor correction.The reactors injects reactive power in the transmission line for voltage compensation. The only disvantage of this shunt reactors is that it shorts whenever high voltage or transients occurs.Only stepped variation of the reactive power is possible.
What are advantages of reactive power?
Real power is power that is used to do work. This is the power a light bulb uses to glow. Reactive power is power that is stored in one part of the AC voltage wave, and released in another. This causes the power to appear as a phase shift, and is generally caused by inductive or capactive loads. With regard to the power system, you can also get reactive power flowing due to unequal source voltages. Under these conditions, the apparent impedance of one source to the other will appear reactive/inductive, resulting in reactive power flow.
What happens if reactive power enters the system?
Reactive power entering the system will increase the system voltage.
What is the relationship between voltage instability and reactive power?
Voltage is a function of reactive power becouse normally X is greater than R between 2 nodes, so the voltage of a line is determined by X, wich on the other hand depends from reactive power Q
What is the meaning of real electrical power (p) reactive power (Q) and apparent power (S)?
Active power: Power that is actually consumed. If you, in the time domain, multiply voltage and current continuously (i.e. via oscilloscope), then take the time-average of the result, that is related to active power. Reactive power: Power that is stored in components, then released again back to the source through the AC cycle. Capacitors and inductors both do this, just in opposite phase. Apparent power: The peak voltage times the peak current (or the RMS voltage times the RMS current, depending on if you're looking at peak power or average power). A power supply must be capable of outputting the full apparent power delivered to a circuit, not just the active power.
