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ajit rath


{ City } bhubaneswar
< Country > india
* Profession * m
User No # 39843
Total Questions Posted # 0
Total Answers Posted # 15

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 95
Users Marked my Answers as Wrong # 81
Questions / { ajit rath }
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Answers / { ajit rath }

Question { HCL, 8553 }

A 100 MVA transformer may be cooled with?


Answer

ONAN, ONAF, WATER COOLING

Is This Answer Correct ?    1 Yes 0 No

Question { L&T, 54398 }

what is the difference between power and distribution
transformer?


Answer

one power transformers can be perform step up &step down
both but one distribution transformers can use either in
step up or step down

Is This Answer Correct ?    2 Yes 18 No


Question { Essar, 4490 }

In HT overhead line why should provide top conducter which
is not connected whith insulater..?


Answer

It is generally used to protect the conductor from direct
stroke of lightening

Is This Answer Correct ?    4 Yes 0 No

Question { Essar, 9914 }

why we are not earthing ht cable at both the ends(sending &
receiving end)?


Answer

If we connect both end to earth then potentional difference
will high & more circullating current will flow .

Is This Answer Correct ?    3 Yes 3 No

Question { 4805 }

Why the Voltage rises when Leading Power Factor is occurs?


Answer

in leading power factor ckt is capacitive&there is less
voltage in capacitive circuit ,so voltage rises

Is This Answer Correct ?    0 Yes 2 No

Question { 6898 }

why neutral should connect to earth in delta-star type
transformer


Answer

To stabilise the neutral current .To minimise the earth
fault current.For harmonic supression.

Is This Answer Correct ?    1 Yes 2 No

Question { 12643 }

what should be the megger test report for 11KV cable when
meggered with 5KV megger , what is the resistance value we
should get


Answer

>10000 megaohms

Is This Answer Correct ?    15 Yes 2 No

Question { 7911 }

What should be distance required in between two phase of HT
cionductors in open area??????


Answer

300 meter

Is This Answer Correct ?    2 Yes 23 No

Question { 6626 }

Why indicate only 440V to 3-phase supply.


Answer

Because we can only mesure the voltage line to line .There
is no instrument to measure L-L-L

Is This Answer Correct ?    5 Yes 4 No

Question { 4972 }

Can we convert off load tap changer transformer to on load
tap changer transformer


Answer

no

Is This Answer Correct ?    4 Yes 1 No

Question { HEG, 18475 }

Why we use series reactor in power system?


Answer

to minimise the starting shotckt current

Is This Answer Correct ?    26 Yes 5 No

Question { 3818 }

What is differential relay? How it operates?


Answer

it is a protective zone relay it sence the vector
difference between two or more similar quantities.
generally it is current operated .at normal operating time
the sum of Ia+Ib+Ic=0 ,but in abnormal conditation the
resultant current will not zero some current will flow
through trip coil & trip the circuit. most differential
relays are baised current differential current.

Is This Answer Correct ?    6 Yes 2 No

Question { Hydropower, 4265 }

how to calculate the ct burden?


Answer

burden of a ct is the total load connected to secondary side
it is expressed in va

Is This Answer Correct ?    8 Yes 1 No

Question { 25272 }

what is first pole to clear factor ?


Answer

iF THE THREE PHASE FAULT NOT INVOLVING THE EARTH THE
VOLTAGE ACROSS THE CIRCUIT BREAKERPOLE. FIRST POLE CLEAR
105 TIMES THE PHASE VOLTAGE IN 3 PHASE AC CIRCUIT BREAKER
ARC EXTINTION IN THE THREE POLE IS NOT SIMULTENEOUSLY AS
CURRENT IN THREE PGASES ARE MUTUALLY 120 DEGREE OUT OF
PHASE. HENCE THE POWER FREQUENCY RECOVERY VOLTQAGE OF THREE
PHASE IN WHICH ARC GETS EXTINGUISHED FIRST IS ABOUT 105
TIMES OF PHASE VOLTAGE.FIRST POLE TO CLEARE FACTOR IS THE
RATIO OF VOLTAGE BETWEEN HEALTHY PHASE TO FAULTY PHASE TO
NORMAL PHASE VOLTAGE.

Is This Answer Correct ?    11 Yes 4 No

Question { 18817 }

in 33kv line how much current will be


Answer

The current in 33 kv line is
1000w=1.732*33*0.8
=21 a

Is This Answer Correct ?    7 Yes 14 No