Active Power, Re-active Power and Apparent power. Should was not it in Watts. Also this is not a technical answer [ as we have already given. So the unit of apparent power is volt-ampere. W and VA are the same, they are both power. VA unit is just used for apparent power to discriminate from the real power unit W , if we use the unit watt W, for both apparent and real power, how would somebody what power you are referring to?
The stator copper losses are 0. If i want to install a kva generator set, how can i choose the rating of the transformer t be installed?
Can anybody help me please! Pls Answer this Q…. What is the current of an V, One thing, since the earth is a good conductor, it can be used as a common line in distribution system.
So the metal usage for the neutral wire can be minimized by earthing the neutral wire in many places of a distribution network. The leakage current of consumer equipments and machinery can be bypassed to earth only if the neutral point of the transformer. Here the transformer is just transferring W power to heater. Transformer rating Depends upon the power factor of the load but this is not specified at the time of manufacturing so rating of transformer and generator in KVA but in motor nameplate manufacturer always mentioned the pf thats why its rating is in kw.
Tranformer rating depand on the cu-losses and core iron losses. So tranformer rating has been kVA. Rating depends on maximum current flowing through conductor without overheating and damage of conductor wire. If heavy load connected to a thin wire, when we switch on, wire get melt due to high current required for heavy load flowing through thin conductor generate heat and wire get melts. Same thing happens in transformer since transformer connected to load grid having resistance capacitance and inductance three basic loads and all are parallel in power distribution system.
All three basic circuit element taking current from transformer winding but resistance only dissipate power, reactive component only store energy in form of charge storage in capacitor and magnetic flux in case of inductor so it is called reactive power. Total current drown from transformer coil is vector sum of active plus reactive current which is greater then current that is dissipated in pure resistor and rating of any conductor transformer coil depends on current flowing through it,since voltage of line is fixed , etc and In KVA, V is fixed line voltage or generating voltage A denote the maximum current that can withdrawn by load without damage of transformer conductor.
That,s why its rating is KVA. That is not the reason for transformer to be rated in VA. Very useful things and comprehensive study material. I like it so much, my fav among all the educational sites. A kVA is 1, volt-amps. The difference between the two is the power factor PF , which is given as a ratio or percentage. You can calculate kVA into kW by multiplying with the power factor.
For three-phase generators, the PF is usually 0. The kVA rating is important as you need to make sure you buy a generator with enough power to run the equipment you intend to use with it.
You can work out the expected load by adding up the number of watts needed to power each of your appliances or pieces of equipment and comparing this with the expected output of the generator in watts.
Generators come in all sizes and power outputs, so the kVA will differ to reflect this. Differences between real and apparent power, and thus watts and volt amps, arise because of inefficiencies in electrical transmission. The resulting inefficiency of electrical transmission can be measured and expressed as a ratio called the power factor. The power factor is a ratio a number from 0 to 1 of real power and apparent power. In the case of a 1. In the case of a 0. Deploying systems that have higher power factors result in less electrical loss and can help improve your Power Usage Effectiveness PUE.
The resulting real power is kilowatts.
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