k.prakashchandra


{ City } karkala
< Country > india
* Profession * rtd e.e.
User No # 54717
Total Questions Posted # 0
Total Answers Posted # 521

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

Users Marked my Answers as Correct # 1314
Users Marked my Answers as Wrong # 525
Answers / { k.prakashchandra }

Question { 3166 }

Why shunt Generator is not recommended to start at ON LOAD condition???


Answer

It may not build up full voltage

Is This Answer Correct ?    1 Yes 0 No

Question { 4676 }

Explain REF protection and sbef protection in transformer?


Answer

REF is restricted earth fault relay, for internal earth fault of Tr . SBEF is standby earth fault relay or backup for both internal and outside earth faults . The CTs of both are connected to neutral of Tr. Discriminative setting is required

Is This Answer Correct ?    0 Yes 0 No


Question { 9889 }

what is the meaning of spur line?


Answer

A short branch of the main line / tapped line

Is This Answer Correct ?    4 Yes 0 No

Question { Dolphin International, 2055 }

If Earthing is poor in a DB of of Residential Building, will residents feel a leakage voltage in a Electrical Ssytem? is this statement true?


Answer

No

Is This Answer Correct ?    1 Yes 0 No

Question { 3094 }

Why winding temperature ct placed in B-Phase of the transformers?? 


Answer

It is in the center and hence least cooled

Is This Answer Correct ?    1 Yes 0 No

Question { 3094 }

Why winding temperature ct placed in B-Phase of the transformers?? 


Answer

My answer was for ' A B C ' sequence . If it is ' R Y B' ,then the reason may due to presence of the tap changer close to R & Y phases

Is This Answer Correct ?    0 Yes 0 No

Question { 2390 }

on 22.03.2015 at 17:15hrs Y phase 66kV class Power Trf-2 Current transformer has flashed over and oil came out. The failed CT has been replaced on 24.03.2015 at 13:15hrs and the Trf has been charged in presence of RT Hassan after conducting the pre-commissioning tests. On the same day at 17:00hrs the commissioned CT has again flashed over and immediately the Trf  has been isolated from power supply. It is confirmed the secondary is not opened and checked the earth integrity and is found ok. Here what would be the reason for the CT failure? 


Answer

Lightning stroke or metering core open circuited due to operation of faulty rotary phase selector

Is This Answer Correct ?    0 Yes 1 No

Question { KSEB, 2708 }

why the name mho relay,despite the locus of circle is impedance?


Answer

mho is alternate name of the same unit , the reciprocal of ohm ( reversing the letters of ohm )= 1 /ohm , impedance is measured in ohms

Is This Answer Correct ?    3 Yes 1 No

Question { 3328 }

What is tan delta point of transformer?


Answer

It is on the top cover near the bottom of bushing , usually concealed with a small plate using bolts /screws

Is This Answer Correct ?    0 Yes 0 No

Question { 15852 }

what is skin effect and why is it absent in DC systems


Answer

Because, the self inductance is more in the center

Is This Answer Correct ?    1 Yes 5 No

Question { PGVCL Paschim Gujarat Vij Company Limited, 2535 }

transformer cooling fan kharab ho jaye to
1-off kar dena chahiye
2-load kum kar dena chahiye
3-koi frrk nhi padta
4-sub galat hai.
choose right option


Answer

Temp badata raha hai to load kam karna , nahi to kuch nahi kana

Is This Answer Correct ?    4 Yes 0 No

Question { KSPL, 3753 }

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?


Answer

It is known to almost all elect engineers that Peak value / Rms value = root 2

Is This Answer Correct ?    0 Yes 1 No

Question { 2650 }

what happens if sf6ckt breaker gas pressure is high or low about the actual rating of gas pressure(5kg/cm2)


Answer

And the contacts may get damaged due to prolonged arcing

Is This Answer Correct ?    0 Yes 0 No

Question { Cummins, 2436 }

can you tell me/show me, how to manually synchronize 2 DG. preferred with video.


Answer

You can employ dark lamp synchronization

Is This Answer Correct ?    1 Yes 0 No

Question { 5459 }

OHMS Law is only applicable for ac or dc or both circuiT?.


Answer

It is applicable to both resistive circuits only

Is This Answer Correct ?    2 Yes 0 No

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