Answer Posted / zan
The small capacitors used in electronic circuits, or with
single-phase motors, are always rated in capacitance units,
like microfarads or picofarads. Some much bigger
capacitors, used for motor surge protection, are also rated
that way. But the large capacitors for power factor
correction are rated in kilovars.
Why the difference and how are the two rating systems
related?
Units intended to add specific capacitance to some circuits
are rated in capacitance units. Analysis of circuit
behavior involves formulas that directly include
capacitance, inductance, and resistance. This applies to
the smaller units, particularly in electronic circuits, and
to surge protection.
For power factor adjustment or voltage stabilization on a
power circuit, system analysis calculations involve amounts
of reactive volt-amperes and watts, making it more
straightforward to rate such capacitors in kvar units. The
two kinds of rating are related by this formula:
kvar = 0.377(C)(kV)^sup 2^
in which C is the capacitance in microfarads and kV is the
voltage applied to the capacitor in kilovolts. One kvar at
460 volts=12.54 microfarads; at 2300 volts, 0.502
microfarad; at 4000 volts, 0.165 microfarad.
Is This Answer Correct ? | 30 Yes | 10 No |
Post New Answer View All Answers
How can we connect additional batteries to three phase ups? What are parameters we have to check when connecting?
what is the differences between microprocessor and general purpose computer
What are the various kind of cables used for transmission?
What is the restart inhabit setting in ABB spam150c relay (Motor protection relay)
in a solar power plant,we are going to step up the voltage 350V to 33kv, and to 132kv GSS. i want to ask that if it is possible that 315v/33kv is not possible because we also use 315v/11kv. or it should be 415v/33kv? is it effects generation or losses? the second question is-generation is depends on LV winding? or LV winding design for generation voltage?
why magnet has north and south poles only why not east and west and why we are considering as north and south poles? why cant we consider as east and west?
What is true sine wave or pure sine wave inverter?? Is it sine wave or step wave?? If it is step wave, waves with how much step is considered as pure sine wave? Is it possible to produce pure sinewave using power electronics?
What happens when two positively charged material is placed together?
Why do you have to use Protecion relay with the function MTB ( Mechanical Trip Button ) for electrical system.
How does a transformer contribute towards the widespread popularity of ac system over dc?
ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?
one electromagnet is called
what is earth fault relay 64T, why it is used in main Incomer and neutral CT of Transformer.
What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?
how calculate the electrical load for industry and office