ramu


{ City }
< Country > india
* Profession * elec engineer
User No # 78756
Total Questions Posted # 0
Total Answers Posted # 25

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

Users Marked my Answers as Correct # 144
Users Marked my Answers as Wrong # 32
Questions / { ramu }
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Answers / { ramu }

Question { ABB, 50701 }

What is the difference when selecting a cable between AC
and DC current?


Answer

1. for both Rated current is RMS only.
2. fault current capacity of AC is higher than DC
3. Voltage drop is more in AC than DC due to Skin effect and
Impedance

Is This Answer Correct ?    2 Yes 4 No

Question { NTPC, 2867 }

Which machine u will prefer to use at where flameble gases are
comming out & why?


Answer

Flame proof machine is used which will not propagate internal
flames to outside

Is This Answer Correct ?    1 Yes 1 No


Question { ABB, 8180 }

what do u mean by PS-0.2-5P class of Ct


Answer

IT IS A PROTECTION CT WITH 0.25% ACCURACY AND 5 VA BURDEN.

Is This Answer Correct ?    0 Yes 0 No

Question { HBL Power Systems, 5379 }

What is the permissible value of earth resistance and as per
which standard / act / rule ?


Answer

Max of 1 ohm as per IS-3043

Is This Answer Correct ?    4 Yes 1 No

Question { 5088 }

FULL FORM OF MCCB


Answer

Moulded Case Circuit Breaker

Is This Answer Correct ?    21 Yes 0 No

Question { 4013 }

i am iti student i have project to do. that IS 100MW
220\33KV SUBSTATION I WANT TO KNOW HOW TO START, LIKE
CALCULATION, WHAT RATING OF CT,CVT, PT, ISOLATOR LIGHTING
ARRESTER WAVE TRAP CIRCUIT BREAKER IN 22OKV SIDE, ALSO TO
WARDS 33KV SIDE PLS HELP ME WITH THIS, THIS MY LIFE NOW, I
KNOW AUTOCAD, I LIKE TO KNOW HOW TO CALCULATE ALL THE THINGS


Answer

1,ct ratig 350/1 & 2500/1 A (220 kv SIDE/ 33 KV Side)
2,cvt cvt FOR 66 + 160 kv
3,pt ratio 220/1.73 /33/173 kv
4,isolator 245 kv / 630A
5,lighting arrester 198 kv / 26 kv
6,wave trap depends on HZ
7,cB 220 kv / 1250 a AND 33 KV AT 5000 A

Is This Answer Correct ?    1 Yes 0 No

Question { Bhel, 10012 }

Generally we denote power in 'p',voltage in 'v'but why
can't we denote current in 'c' instead of I.


Answer

Since C is already used for basic element Capacitor

Is This Answer Correct ?    2 Yes 6 No

Question { CGL, 6457 }

What should the transformer connection of a 11/220 kV step up
and 66/11 kV step down transformer ?


Answer

delta /star / and star /delta

Is This Answer Correct ?    9 Yes 2 No

Question { L&T, 6043 }

funtion of choke


Answer

It works as ballast (gives high voltage) at start and controls current by dropping voltage during running.

Is This Answer Correct ?    10 Yes 2 No

Question { 3314 }

what is the formula of high voltage testing of three phase
induction motor?


Answer

2 times the rated volts in KV plus 1 KV (Ex: for 415 V=2*0.415+1=1.8 KV)

Is This Answer Correct ?    2 Yes 0 No

Question { 5463 }

if a bird sits on the service wire it didn't get shock then
why the human get shock when he touches it(assume that human
is not on the ground and any object i.e. in space)?


Answer

HUMAN GETS SHOCK EVEN NOT TOUCHING GROUND BECAUSE THE SAFE DISTANCE BETWEEN LIVE LINE AND GROUND IS REDUCED WHEN HE TOUCHES LINE. ALSO CAPACITIVE CURRENTS PLAY AN IMPORTANT ROLE HERE.

Is This Answer Correct ?    9 Yes 0 No

Question { 3346 }

Is it possible to implement Restricted Earth Fault
protection for a transformer without neutral CT?


Answer

No

Is This Answer Correct ?    0 Yes 1 No

Question { 5339 }

why do transformer make a sound


Answer

Due to magnetostriction(vibration or movement of laminations by alternating wave)

Is This Answer Correct ?    19 Yes 0 No

Question { 3567 }

in fuel level controller what is MOV please define.


Answer

Motor Operated Valve

Is This Answer Correct ?    0 Yes 0 No

Question { 4793 }

minimum ohm for lighting
minimum ohm for Earthing


Answer

It is not minimum but maximum which is less than 1 ohm.

Is This Answer Correct ?    6 Yes 2 No

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