0
What is the power factor of AC generator when the reactive power is equal to zero?
Wiki User
∙ 12y ago
Per factor is 1 when reactive power is zero.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What is the function of capacitor in an electric generator?
In an electric generator, the function of a capacitor is to provide reactive power and improve the power factor of the generator. When a generator is connected to a load, the load may have a combination of resistive, inductive, and capacitive components. Inductive loads can cause the power factor of the generator to decrease, resulting in lower efficiency and voltage regulation. By adding a capacitor in parallel with the generator, the reactive power generated by the capacitor can offset the reactive power of the inductive load, leading to improved power factor correction. This helps to enhance the efficiency of power transfer and stabilizes the voltage. The capacitor absorbs and supplies reactive power, reducing the strain on the generator and ensuring a steady and efficient supply of electrical energy.
What is the relationship of the reactive volt-amperes to the total volt-amperes in a unity-power factor circuit?
If you have unity power factor, p.f.=1, then the real power P must equal the total power S. Therefore, there is no reactive power being used, Q=0.Alternative AnswerApparent power is the phasor (vector) sum of true power and reactive power: (apparent power)2 = (true power)2 x (reactive power)2
Why you not usually use induction generator?
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
Why kva written on generator?
because the generator generate apparent power in kilos and it is written as ( kilo volt ampere OR KVA) it is the combination of active and reactive powers where active will be used by the consumers and the reactive will come back to the generator.
How do you control reactive power?
The reactive power depends on the load and not the generator. Reactive power can be detected at the generator, and the load disconnected if there is too much being drawn. A generators's voltage depends on the speed, and the power produced depends on the current in the field winding. An alternator running on a bus bar, as in a grid system, runs synchronously with the grid it is connected to. In this case the power produced depends on the rate that steam is supplied to the turbine, and although the speed stays constant, any increase in power output is accompanied by an advance in the phase angle of the rotor.
What is the function of capacitor in an electric generator?
In an electric generator, the function of a capacitor is to provide reactive power and improve the power factor of the generator. When a generator is connected to a load, the load may have a combination of resistive, inductive, and capacitive components. Inductive loads can cause the power factor of the generator to decrease, resulting in lower efficiency and voltage regulation. By adding a capacitor in parallel with the generator, the reactive power generated by the capacitor can offset the reactive power of the inductive load, leading to improved power factor correction. This helps to enhance the efficiency of power transfer and stabilizes the voltage. The capacitor absorbs and supplies reactive power, reducing the strain on the generator and ensuring a steady and efficient supply of electrical energy.
How can improve the power factor?
To increase capacitive load and decrease inductive loadAnswerThe most common method is to add a capacitor, or a capacitor bank, in parallel with the load. In practise, the reactive power of the capacitor (they are not rated in farads, but in reactive volt amperes) must be a little short of being equal to the reactive power of the load, so that the power factor approaches, but does not equal, unity.
Importance of load characteristics of a generator?
I assume this is asking about the capability curve of a generator. A generator can only produce so much actual power (kW) at a specific power factor. As power factor changes, the amount of current flowing that is due to reactive power will also change. The total current Ix (reactive power) + Ir (real power) will cause heating in the generator, and so the generator can only kick out so much current, be it real power or reactive power. Reactive power is used to control the voltage (drag it down, or push it up) and change phase angles to push more power down specific lines. If the load on a generator is such that it's expected to generate power outside its' capability curve, terminal voltage may begin to sag (which will cause the generator output power to be less, potentially exacerbating the problem), or may float too high (potentially damaging equipment). Excessive heating in the generator can also result, and protective devices may kick in to trip the generator off line.
If 2kw generator is supplied to 10 ampere load how much will be its power factor?
The 10 A in the load includes the real power and the reactive power, if it is a single phase 120 V generator it can supply 16.67 A; that means a 2000 KW load at a power factor of 1.00, of for example a 1600 W load at a power factor of 0.80, in both cases the output current of the generator will be 16.67 Ampers, it is the same with the 10 A load, the power factor is included in the supplied current.Rosa María Valdespino.
What is the relationship of the reactive volt-amperes to the total volt-amperes in a unity-power factor circuit?
If you have unity power factor, p.f.=1, then the real power P must equal the total power S. Therefore, there is no reactive power being used, Q=0.Alternative AnswerApparent power is the phasor (vector) sum of true power and reactive power: (apparent power)2 = (true power)2 x (reactive power)2
When synchronus generator is supplying active and reactive power it is operating at leading or lagging power factor?
A synchronous generator is operating at lagging power factor (positive P & Q) when it is supplying P & Q to the system. P & Q are positive which means that they are flowing away from the bus where the generator is connected (overexcited case). On the other hand, it is operating at leading power factor when it is supplying P and absorbing Q. The sign of Q is negative which means that it is flowing towards the generator bus (underexcited case).
Why does a synchronous generator typically run at lagging power factor?
When a synchronous generator is running at lagging power factor the current it supplies lags its terminal voltage. Thus it acts as a source of reactive power, or magnetizing vars. Reactive power is needed to create the magnetic fields in devices such as transformers and induction motors. The Power factor of a utility depends on the type of load it supplies. Usually the Loads on utility are inductive loads (where the current lags behind the Voltage) and hence the power factor at which the utility operates is lagging. Most loads connected to utility are inductive loads like motors, fans, rolling mills which cause the power factor of the utility to be of lagging in nature.
Why you not usually use induction generator?
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
How do you calculate capacitor rating for improving power factor?
Power-factor capacitors are rated in reactive volt amperes. To determine the appropriate rating, it is necessary to determine the existing (inductive) reactive power of the load, then determine the amount of (capacitive) reactive power necessary to achieve the desired power factor (it's rarely economical to try and achieve unity power factor), and this will be the necessary reactive power of the capacitor bank.The capacitance of power-factor correction capacitors is not really relevant to the calculation, which is why they are rated in reactive volt amperes, rather than in farads.
Why kva written on generator?
because the generator generate apparent power in kilos and it is written as ( kilo volt ampere OR KVA) it is the combination of active and reactive powers where active will be used by the consumers and the reactive will come back to the generator.
Do reactive component of impedance dissipate power?
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.
How do you control reactive power?
The reactive power depends on the load and not the generator. Reactive power can be detected at the generator, and the load disconnected if there is too much being drawn. A generators's voltage depends on the speed, and the power produced depends on the current in the field winding. An alternator running on a bus bar, as in a grid system, runs synchronously with the grid it is connected to. In this case the power produced depends on the rate that steam is supplied to the turbine, and although the speed stays constant, any increase in power output is accompanied by an advance in the phase angle of the rotor.
