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Reactive power is mainly used by big industries. To put it simply, things which store energy like capacitors and inductors take in energy then let it out as the ac voltage supply changes. The voltage is largely unafected, but the maximum currents required by the system is increased.
Short---- More current is required with reactive power, and this increases running costs. Most networks are inductive, and adding capacitors balences the system out. Big industries are charged for reactive power used but domestic users aren't. (note, reactive power is only relavent to ac circuitry and networks, not dc)
Wiki User
∙ 9y ago
Wiki User
∙ 14y agoReactive power is used to transfer power system (instead of dipping voltage at one end as is necessary with DC).
It is also used for voltage control. If voltage support is needed, capacitors banks are often installed - these cause the voltage to increase. On very high voltage power lines, it is often a practice to install inductors, because the line charging current (ie current due to the capacitive effect of the line to ground) can cause the voltage to increase beyond design specification. These help bring the voltage down into tolerance.
Wiki User
∙ 10y agoThis is not really a practical question because power systems run at an almost constant frequency. But for equipment that runs with a lagging power factor, like induction motors, the presence of inductance in the motor windings means that the reactance would go up and the power factor down with increasing frequency. So the reactive power would increase relative to the real power.
Wiki User
∙ 11y agoEvery electric loads that works with magnetic fields(i.e: motor,chokes,Transformers,inductive heating,arc-welding generators etc)produces a varying electric lags which is called INDUCTANCE.The lag of inductive loads maintain the current sense(eg: Positive) for some time and the negative going voltage tries to reverse it.These phase shift between current and voltages have to be maintained.The current and voltage have opposite sign.During this time the negative power or energy is fed to the network/circuit.When current and voltages have same sign again,the same amount of energy is required to built up the magnetic field in inductive loads.This magnetic reversal energy is called Reactive power.In AC circuit (50 Hz - 60 Hz) this process repeated 50 to 60 times a second.So an obvious solution is to briefly store the magnetic reversal energy in capacitor and relieve the network (the supply line)of this reactive energy.
Wiki User
∙ 13y agoin the absence of any power electronic devices...
the mechanical input to a generator connected to grid, will be converter to real power...
the excitation which is provided acts as a source of reactive power...
the mechanical input cannot transform into reactive power (in the absence of power electronic devices) and whatever comes in is transformed to real power. The excitation provided stores energy in the air gap of the generator, this energy sloshes between the load reactor (this is transfered back and forth between the generator air gap to load - motor air gap or capacitor or inductor air gap). This energy is not spent in any form.
thus source of reactive power is solely the excitation given to the generator.
Wiki User
∙ 13y agoGenerators are designed to be able to do this to a certain degree. Output real power will decrease. Taking in vars will also decrease the system voltage. This causes the windings in the generator to heat, so too much can damage the windings.
Wiki User
∙ 9y agoThe effect of reactive power in generators allows the generator to maintain high voltage. Without the high voltage, the generator will be faulty or will stop working.
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What is reactive volt amps?
volt ampere reactive is the unit of reactive power.It is the power which does no useful work but is required to assist in performing work,such as setting up magnetic fields in motors and transformers.It is also called as imaginary power.It occurs in purely reactive circuit i.e. purely inductive or capacitive.The inductance absorbs the reactive power and capacitance injects the reactive power.In inductance,reactive power is utilised to develop the flux while in the capacitance,the reactive power's function is to store the charge.
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 power of the courts is reactive?
Pronouncing judgment in a given criminal case is an example of a reactive power that the courts do have. Interpreting the law to the accused is another example.
What would you measure capacity in?
Lots of things are measured in capacity. Many cars have a 13 or 21 gallon capacity. Drink manufacturers measure the capacity of the containers they are filling. Reactive (electrical) power is measured in capacitance. Capacitors have a measurable capacity of storing and releasing reactive power for voltage and load control. (Surges and dips).
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.
What happens if reactive power enters the system?
Reactive power entering the system will increase the system voltage.
What happens to reactive power in a circuit that has both inductance and capacitance?
Inductors are considered to be a load for reactive power, meaning that they will draw reactive power from the system. Capacitors are considered to be sourced of reactive power, they feed reactive power into the system. If you have a circuit that is at unity (balanced with inductors and capacitors) no reactive power will be drawn from the source. You will have unity power factor. If your circuit is more inductive than capacitive it will be drawing reactive power from the source. The opposite is also true for capacitors.
What is the role of reactive power in a power system?
To supply the reactive power demand of load and to regulate of output volage at the grid
Why there is no reactive power in DC system?
In case of dc there is no reactive components and current drawn from the supply is in phase with the voltage.due to absence of inductor and capacitor the reactive power demand in dc is zero.
Why reactive power is named as reactive?
Actually reactive power is a power which flows in between load to source which is a reactive action of the power given from source to load.the given power to load will not be utilised fully.some power will be oscillating from load to source.this is called reactive power.
How to increase load on a bus in power system.Does it means to increase the bus active power demand or reactive power demand or both?
You can increase load on a bus power system by increasing the bus active power demand ans reactive power demand.
What is the unit of measure for reactive power?
Volt Amps [volts times amps] is used for reactive and apparent power. Watts (dimensionally the same as volt amps) is used to indicate real power.AnswerReactive power is measured in reactive volt amperes (var).
What is reactive power in three phases system?
Reactive power occurs in an AC system when it has a load with a poor power factor such as an induction motor. The power delivered is less than the voltage times the current by a factor called the power factor. The real power and the reactive power combine according to Pythgoras, in other words if they are represented by two sides of a right-angle triangle, then the hypotenuse represents the volt-amps. In the equation kW is the power in kilowatts, kVAR is the kilovolt-amps of reactive power, and kVA is the kilovolt-amps: (kW)2 + (kVAR)2 = (kVA)2
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.
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.
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.
