hi every one
noticed when we prepair to the 20 km under ground cable operation that the kwh meter record covsumption on no load state and zero on kvarh meter ???
why????

A Rudrendra

• Jul 15th, 2016

We know that for every cable there will have a small amount of resistance. So, When we draw the equivalent circuit for this case it will be purely resistance connected across supply (as there is no lo...

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How to identify Transformer rating without Name Plate details?

A Rudrendra

• Jul 15th, 2016

By using type of bushings used we can know the following details 1.Whether it is step up of step down transformer 2.Voltage rating of primary and secondary side By using type of cooling we can fi...

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What is the thumb rule for insulation value in bus bars, phase to phase and phase to earth for 11 & 33 KV system?

A Rudrendra

• Jul 15th, 2016

As per my knowledge there is no thumb rule but the minimum clearance between phase to phase & Ph to Earth in 33KV is 1.5 & 1Meters

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How much min BDV of oil in transformer is required when charged it first time in 11kv, 66kv and 132 kv of transformer?

A Rudrendra

• Jul 15th, 2016

It should be minimum 54KV

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Why 660v is use in place of 440v in some big KW motor?

A Rudrendra

• Jul 14th, 2016

It is the secondary standard voltage level in LT side and by using this voltage we can reduce the motor rated current.

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How to calculate the NGR resistance to connect in alternator / transformer. I mean to say thumb rule of NGR against MW capacity of alternator / transformer.

Aadil

• Jul 1st, 2016

NGR or Neutral Grounding Resistors are used to limit the ground fault current to a safe value in the event of earth fault. A NGR limits the earth fault current to a value which will be sufficient to operate protective relays and prevent unwanted fault damage.

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chanchal

• Jun 5th, 2016

Earthing is inside of earth with any conductive material and grounding is on top of the earth for machines (grounding can be with high ohms but earthing must be with 0.1 ohms)

harsha vardhan

• May 2nd, 2016

In my case both are similar

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What are the elements in electrical engineering?

Josue

• May 30th, 2016

Resistors, Capacitors and Inductors

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Explain How to Start a Induction Motor?

Viral p. patel

• May 28th, 2016

When we give the supply to starter winding. The alternating flux will be produce. That flux link with rotor winding through core. Then the current will be produced in rotor winding. The rotor winding ...

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What are the technical reasons for Soaking Test in Transformer and Switch Gear?

ali raza

• May 26th, 2016

I think the transformers are soaked with normal operating voltage level as testing with HV of the transformer insulation, winding at site is impractical as well not economical. Besides soaking allows ...

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Neutral is connected to Earth at the source to ground, the unbalanced current in the electrical network mainly in distribution system, What happens if we connect neutral to earth at load side DB?

ashutosh singh

• May 24th, 2016

What is MD & MTTR?

ali raza

• May 21st, 2016

No because when unbalance current flow through neutral short circuit occurs at that point where neutral grounded

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How to measure the cross-sectional area of a cable which is 1000 sq. mm.?

Heaven

• May 24th, 2016

3.14 x radius of cable^2

KHURAM

• Dec 10th, 2015

A=pi*r^2

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What is the main difference between Transformer based UPS and Transformer less UPS and its operation?

Dheeraj Rai

• May 22nd, 2016

Transformer Based UPS Transformers in general are used for number application, the most obvious one is to stepping up or down the voltage. In UPS application they are also used: To create galvan...

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What are the advantages & dis-advantages of Harmonics in Power System?

Qaphelani Sgcino

• Apr 2nd, 2016

Disturbances in the communication networks and telephone lines.

Kevin

• Mar 27th, 2016

Disadvantages of Harmonics: Harmonics degrades the performance of power system. Some of the disadvantages of harmonics in the power distributed network are listed below: The harmonics flowing in the...

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What percentage of system overhead will not result in poor performance for user programs?

>10%

>20%

GANESAMOORTHY

• Mar 28th, 2016

>20%

Avinash

• Mar 1st, 2016

>20%

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When alternator is over exited, the power factor will be
a. Lagging
b. Leading
c. Zero

Dipti Ranjan

• Mar 7th, 2016

Pf is lagging because A.R is demagnetizing.

pradeep1987

 Profile Answers by pradeep1987 Questions by pradeep1987

• Jan 31st, 2016

It is lagging. When the alternator runs at lagging power factor, the armature reaction demagnetize the main field flux. To compensate the extra magnetic field required so that the alternator is Overexcited

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mani babu amballa

• Mar 5th, 2016

When the charging coil is disturbed suddenly, it will produce large amount of voltage

shubham

• Aug 31st, 2015

Choke work like transformer and its major components which is connected Across its inductor Stores current like caps

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How can we make wattmeter to measure reactive power?

Amol takate

• Jan 27th, 2016

For calculation of the reactive power in 3 phase connected load procedure is to connect the current coil of single phase wattmeter in any phase series with the load and connect the pressure coil acros...

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How can we chose transformer star to delta or delta to star connection? What condition is suitable for star connection? What condition is suitable for delta transformer?

mohammed

• Jan 18th, 2016

If we want to distribute to customers we use star connection but if we want to trasmit power we use delta connection

pdp

• Jan 13th, 2016

Delta star connection generates 73.2% more than dd and yy connection because star side requires less insulation than delta side in normal condition..we can put extra insuation to generate high voltage...

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What is meant by distributed winding and concentrated winding?

karthik

• Jan 20th, 2016

Concentrated and Distributed wiring definitions

Ravikumar Eta

• Jan 10th, 2016

In concentrated type winding, all the winding turns are wound together in series to form one multi coil.

In distributed type winding, all the winding turns are arranged in several full pitch or fractional pitch.

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