What is the difference between the watt hour meter and Var
hour meter in terms of internal connection and work theory .
ie "When the meter records watt-hour an when the meter
records var hours ??"
Answers were Sorted based on User's Feedback
Answer / k.prakashchandra
In case of 1 phase , the voltage is shifted by 90' and in 3
phase, the voltage of other two phases is applied.
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / k.prakashchandra
In power triangle VA x cos theta is active power and VA x
sin theta is reactive power.
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / rafael barreto
The alternating current has two compents: one active and
one reactive. The active component produces work, it moves
the fans, the refrigerator, machine tools etc. The reactive
compoent is useless, but necessary to sustain the magnetic
fields of the induction devices. The watt-hour meter reads
the active component of the current. Both active and
reactive compoents load the feeder, therefore we might be
interested in knowing how large the reactive component isIn
that case a reactive meter is used to determine the
reactive load. The var-hour meter does not read "energy",
as energy ir work related and reactive power does not
produce useful work. For more details see "Reacive Power
Management by R. Barreto in Amazon, Kindle version.
Is This Answer Correct ? | 0 Yes | 1 No |
How much inductance or resistance require as a starter in series with induction motor of specific capacity(e.g. 5 hp) ? What is formula for it ?
What is the difference between harmored cabled and unharmored cables
HOW DOES THE PERCENTAGE DIFFERENTIAL PROTECTION WORK IN POWER TRANSFORMER
what are lightning masts?what is their purpose???
How can make a star delta with Rstar delta feeder ( ( 4contactor & one timer ) pls answer with digram (power &control digram)
Define branch?
What are the site acceptance tests for power cables, DG Sets, LT panels & 30kVA UPS ?
what is RR number Abbreviation energy meter
Which type of alternator used in power station?
what are the interview question asked in wind mill about electrical
What is Autodialer used in FAS????
I want to know what must the CT ratio be on a load of 300A is a 3PH nutral to earh installation?