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.

Answer / k.prakashchandra

In power triangle VA x cos theta is active power and VA x
sin theta is reactive power.

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.

static chagre

0 Answers  

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ELCBs are installed for protecting humans from AC leakage current.Is there a device which protects humans from DC Leakage current??e.g.leakage from batteries...If not,then why so???

1 Answers  

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1) Explain why we don't link the two earthing system ht and mv on a pole mounted transformer sub-station.

0 Answers  

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when turbine trips generator will becomes induction motor or synchronous motor?

4 Answers   JSW,

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4-Why we measure the insulation resistance of main core and frame in spite of that must be connected with ground before energize the transformer?

3 Answers  

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1.WHAT IS A SMART CAPABLE DB ( DISTRIBUTION BOX) ? 2. HOW TO DECIDE THE TYPE OF DB TO BE USED ( RECESSED/ PLUG TYPE/ SMART ETC ETC? 3. WHAT IS MILLENEUM BUS BAR USED IN DB? 4.DIFFERENTIATE MCCB AND MCB.

0 Answers  

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what is the difference between current rating and breaking current of an MCCB? and for a known load how to calculate the current rating of a MCCB?

1 Answers   HPL,

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what are ABCD curves in MCBs and how we observe that curves?

2 Answers  

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LT cable fault chaecking equipment and to find out the distance at what distence it failure . Name and where it is available?

0 Answers   Himatsingka Seide Ltd,

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Please explain me about Relay curves and their sources to read ?

0 Answers  

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What's the difference between non break power supply and non break non short break power supply

0 Answers  

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why neutral grounding transformer is used for generator and why it is not used for transformers?

2 Answers   UPCL,

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