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Is caesium reactive or non reactive?
Caesium is an extremely reactive chemical element.
Why isn't hydrogen reactive?
Hydrogen IS reactive
Which is the most reactive of the halogens and why is it the most reactive of the halogens?
fluorine is the most reactive
Why is manganese very reactive?
Manganese is not particularly reactive. This is strange considering it is more electropositive than its neighbors in the periodic table.
What is non reactive?
non -reactive
What is a pigtail on a dc generator?
Pigtail is a device to protect the brush from sparking
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.
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 is brushes placed at MNA in a dc generator?
to avoid sparking ,since their is no e.m.f induced in magnetic neutral axis.
What is the power factor of AC generator when the reactive power is equal to zero?
Per factor is 1 when reactive power is zero.
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 a Generator capability curve?
The generator capability curve described the capability real and reactive power capability of a generator. Real power is plotted on the horizontal axis, while reactive power is plotted on the vertical axis. A reactive capability curve consists of three curved segments. One segment is the arc of a circle centered at the origin of the reactive capability curve. Because the radius of that circle is the apparent power, S (in MVA), it is based on the thermal heating limitations inherent in the stator winding and reflects the fact that the stator limitation is based on current alone. The second segment is an arc of a circle centered on the Q axis - the arc joins the positive Q axis with the constant MVA portion of the curve, and defines the upper boundary of reactive power OUT of the generator. It is the arc of a circle because it also reflects current-based heating; the critical difference is that the limitation described is that of the rotor winding. The third segment joins the negative Q axis (representing reactive power into the machine) with the constant MVA portion of the curve. This segment reflects end-ring heating while in underexcited operation. When you change the tap on the generator step up transformer, you will change the reactive output of the generator. Remember that reactive (VARS) always flow downhill in voltage - from higher voltage to lower voltage. So if you change the tap on the transformer to produce a lower open-circuit secondary voltage, the reactive output of the generator will increase. Conversely, if you change the tap to cause a higher open-circuit secondary voltage, the reactive output of the generator will decrease.
What will happen when different voltage droop generator synchronised?
They will run with different reactive power output, i.e. reactive load won't be equally shared between units.
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.
What happens if excitation fails in parallel oprating generator?
when excitation fails,Reactive power will be supplied by the system to which the generator is connected and generator will work as induction generator and its speed will rise a little. generator which was in over excitation mode will work in underexcitation.but there is under excitation limit which should not be reached so we should detect loss of excitation and trip generator
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.
What is the characteristics for a generator on a full load?
What characteristics are you looking for? At full load, a synchronous generator will be spinning at synchronous speed, providing real power (watts), and likely some reactive power (vars), or it may be taking reactive power from the system to help hold the system voltage down under light loading conditions.
