# what are the importance of reactive power?

what are the importance of reactive power?

Importance of Reactive Power

•Voltage level control is important In power system. Varying reactive power will vary voltage level.

•Reactive power is directly proportional to voltage level means if reactive power is more voltage level is more and if the reactive power is less voltage level is less.

•Reactive power is very important to avoid blackouts. Power is equal to voltage into current (P=VI). So if the voltage level is low current level is high this will cause transmission lines to go offline.

•Reactive power is required with active power to do useful work.

•Reactive power is useful in transmitting or boosting the active power in transmission lines with less losses.

•Inductive load like induction motor requires reactive power for useful work.

•Reactive power is required to generate magnetic flux.

## Related questions

Description : Explain the term reactive power. Why it is sometimes essential to measure reactive power?

Answer : Reactive power: The reactive power (Q) is defined as the product of voltage(V), current (I) and sine of angle between voltage(V) and current( I) Therefore Reactive power Q = V I ... power so that corrective measures can be taken accordingly to maintain systems power factor near to the unity.

Description : List any two methods of reactive power measurement in 3 phase circuit.

Answer : Methods of reactive power measurement in 3 phase circuit: (i) Two single phase wattmeter method (ii) One single phase wattmeter method

Description : What is the formula for reactive power?

Answer : The formula for reactive power is, Reactive power = VI sin (phi) The unit of reactive power is VAR ( Volt ampere reactive). The reactive power is denoted by 'Q'. The formula for real power is, Real power = VI cos (phi) The unit of real power is watts. The real power is denoted by 'P'.

Description : The reactive power transfer over a line mainly depends on

Answer : The reactive power transfer over a line mainly depends on lVsl- lVRl

Description : Use Voltmeter, ammeter, wattmeter to determine active, reactive and apparent power consumed in given R-L series circuit, draw phasor diagram.

Answer : Practical Significance In the industry environment Electrical Engineering diploma graduate are expected to measure basic parameters like voltage, frequency, time period etc. for R-L series circuits. Therefore ... /varying L. 7. Draw the phasor diagram for each of reading for verification.

Description : why reactive ohm cannot converted electrical energy into heat?

Answer : Because it describes the resistance of element that store energy rather than dissipate energy as heat

Description : Precise control of reactive current flow entering the transmission and distribution systems can be minimized by using (A) synchronous condenser (B) static VAR capacitor (C) capacitor bank (D) thyristor switched reactor in parallel with capacitor

Answer : Precise control of reactive current flow entering the transmission and distribution systems can be minimized by using (A) synchronous condenser (B) static VAR capacitor (C) capacitor bank (D) thyristor switched reactor in parallel with capacitor

Description : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

Answer : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

Description : State the importance of electrical power in day to day life.

Answer : Importance of electrical power in day to day life: 1. Electrical energy is the basic necessity for domestic (residency), commercial, industrial, agriculture, consumers , transport (Electric ... agriculture products. iv) Running motors, furnaces of various kinds in industry, running locomotives

Description : Explain the importance of solar power in the energy deficient India.

Answer : Mainly electricity generated in India is from -  Hydro power plant  Thermal power plant  Nuclear power plant  BUT,  To construct new Hydro power plant following are problem :- 1. There is ... start) 10. It saves the fossil fuel (coal, diesel, oil etc.) which are limited available.

Description : reactive power is greater in load side compare to generator what will happen?

Description : What are the basic requirements of locating wind power plant ?

Answer : The basic requirements of locating wind power plant:  1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid.

Description : what are the three different types of Electric power?

Description : Why capacitors are used to improve power factor?

Answer :  Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

Description : "Hydro electric power station are not perennial power station". Justify.

Answer : Justification: The water utilized by the hydro power plants comes mostly from storage dams/reservoirs which get filled up during the monsoon rainy season. Such reservoirs are utilized for supplying ... are important. Hence "Hydro electric power stations are not perennial power station"

Description : State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant.

Answer : 1. Because of following points Nuclear power plant used as base load power plant:-  1. Nuclear power plants is very economical for producing bulk amount of electric power 2. Nuclear power plant is reliable ... . The plants can be put on load easily. 4. Diesel engines take less time to make OFF.

Description : Two 100W, 200V lamps are connected in series across a 200V supply. The total power consumed by each lamp will be in Watts

Description : Capacitors for power factor correction are rated in?

Answer : Capacitors for power factor correction are rated in kVAR.

Description : What are the criteria for selection of site for hydroelectric power plant?

Answer : Following Factors to be kept while site selecting for Hydro power plant:  1. It should be located where high rain fall occurs. 2. A large catchments area must be available to store water. 3. It ... 12. Cost of land should be less. 13. Skilled and unskilled man power should be available nearby.

Description : What are the types of power generation?

Description :

What are the power quality disturbance?

Description : What are the different power quality issues?

Description : What are interconnected power system?

Answer : Interconnected power systems are those which connect different geographic regions. In Australia we have a National Electricity Grid which connects 6 states. Transfers of power occur between the states depending ... make more profit from this.National-Electricity-Market-Fact-Sheet.pdf (0,9 MB)

Description : What are the components of a power system?

Answer : generator Traansformer Conductors Insulators

Description : What are the types of power losses in inductor?

Answer : Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

Answer : Free of costPollution freeLong life Less maintenance

Description : What are the advantages of hydroelectric power?

Answer : It is free from pollution It requires less labour to supervision Here water can use again and again

Description :

What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that:

Real power = 50 W

Vrms of the source = 120

Frequency = 50 Hz

#powerfactor

Description :

Description : What is the choice of size and number of generator units in interconnected power system?

Answer : Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

Description : What is need of regulated power supply?

Answer : A regulated power supply is used to ensure that the output remains constant even if the input changes. But sometimes main supply voltage, load, and surrounding temperature keep changing and altering the ... power supply is needed that will accept an AC input and give a constant DC output.

Description : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be excessive  (B) Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

Answer : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be ... will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

Description : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Description :

What is the power factor of purely resistive circuit.

Answer : Unity that is 1

Description : What is the relationship between power and resistance?

Answer : P = I2R Where P = power I = Current R = Resistance

Description : What is the relationship between power and current?

Answer : P = I2R Where P = power I = Current R = Resistance This the relationship between current and power.

Description : What is the symbol for AC power?

Answer : If you need to measure alternating current in a circuit, different multimeters have different symbols to measure it (and the corresponding voltage), usually "ACA" and "ACV," or "A" and "V" with a squiggly line (~) next to or above them.

Description : what is reverse power relay?

Answer : Thereverse powerrelay is a directional protective relay that prevents power from flowing in the reverse direction. Read our article going back ... it all to be up to date. And if you do, read it anyway just to check if youreallydo!

Description : If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?

Answer : 128 volts ,2048 watts

Description :

Answer : Unit of power is Watt denoted by capital W .

Description : What is the value of Beta in power BJT?

Answer : The beta value in power BJT is 5 to 10.

Description : What is drive circuit in power electronics?

Answer : Driver is used for Motion Control through the use of power electronics.

Description :

Answer : Because of following advantages concentrating type collector are used in solar power plant: -  1. Temperature: Temperature obtained is high because absorber area is less and collector/reflector area ... results: As tracking system is used better results are obtain than flat type collector.

Description : The main disadvantages of having poor power factors are:  (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

Answer : The main disadvantages of having poor power factors are:  (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

Description : If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

Answer : If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor

Description : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Answer : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

Description : Regulating-transformers are used in power systems for control of

Answer : Regulating-transformers are used in power systems for control of power flow

Description :

Answer : Overhead lines for power supply to tramcars are at a minimum height of 10 m.

Description :

Answer : Commonly used instruments in power system measurement are induction.

Description :

Answer : The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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