Answer / nishad

LA - lightnig arrester: it is use to protect the equpment /
system from dangerous atmospheric lightining.

CT - Current transformer:we can't talk load out put
directly to the meassuring equipmet from the load line. We
use CT for that purpose. It is useing for meassuring the
load current & other meassuring Data( Ampere, KW/KVA, PF
etc).In the cause of protection CT is very essential, such
as over load ( solid state OLR - CT through) Earth fault,
Differetial Protection etc.... WE need CT's servies in Both
LT / HT.
PT - potential transformer:It is also useing for meassuring
the voltage & other meassuring Data( KW/KVA, PF, HZ etc).In
the cause of protection PT is also very essential,such as
under voltage,over voltage, Under HZ, OVER HZ etc... we
can't take the reading directly from the line in cause of
HT so we are usein PT.WE need PT's servies in Both LT / HT.

Answer / jariwala vishnu m.

LA - lightnig arrester
CT - Current transformer
PT - potential transformer
the panel from which all the above stated equipment are
controlled is LA CT PT panel.
with the help of this panel we can get data as well as
control the substation's equipment.

Answer / dalip verma

with the help of this panel we can get data(HT unit
measurement, basiclly for HT use)

Advantage of LT panel vs HT panel ?

1 Answers   HCL,

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In CDG type IDMTL realy O/L , E/F, O/C which are used for out going feedrs,on R-phase o/c element, Y-phase , e/f elecment and on b -phase o/c element will be connected . Why the earth fault on center phase only, why not on other two phases?

2 Answers  

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At present how many HVDC lines are there in india

18 Answers   HAL, Infosys, KSEB, Kuntham,

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase), before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

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The CHARGED BATTERY GET DISCHARGED WHEN IT IS NOT IN USE FOR LONG TIME.GIVE REASON.

1 Answers  

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WHAT IS THE FUNCTION OF PULSE TRANSFORMER IN DC DRIVE

5 Answers  

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Based on CPI/CGPA they shortlist the candidates & than directly start Interview so there is no Written Exam or GD Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on 6th,Aug, 2007 & the Questions asked to me by Interview Board ( 4 People) are from HR/SummerTraining/BTP/Subject-core, POWER SYSTEM & MACHINE. time duration of I/V is about 15-20 Minutes. HR- Q.1 Name,hobbies & About family background ? Q2.What u know abt NTPC ?? Q3.Why u want to choose NTPC as ur Carrier's starting i.e power sector not any other Oragnisation or sector ?? Techincal Questions- Q1.What is the reason for transformer Noise ?? Q2.Which material is used for making Transformer oil & How u measure its dielectric strength & Name the test ? Q.3 Which Machine u will prefer 2 use if flammble gases are coming out at a place & why ?? Q4.What is relation b/w Transmission Lines & Communication Lines ? Q5.What is the maximum capacity Synchronus Machine & total powerGeneration in our country ? Q.6 In india Power generation is at 50Hz while in America its 60 hz ,why so ?? Advantage or disadvantage ?? Q.7 Maximum Generation Voltage in india ? Q8. What is the Voltage regulation & why its required n how much is permissible ? & causes of voltage variation ?? Q.9 Why electric shock is feel ?? n in a Electric Train why we didnt feel that ? Q.10 Have u seen/ experience of any power plant/ industry related to the power sector ? so these are the questions which not too diffcult i think was asked to me.

6 Answers   NTPC,

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i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.

0 Answers  

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How to calculate the sag of OPGW during stringing???

0 Answers  

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please suggest some good universities with low cost iam in totally full confusion so please help me my profile gre 283 and ielts 5.5

0 Answers  

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Which type of control system is expensive — closed loop or open loop?

1 Answers   GE,

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what is the terminal voltage of dc series generator running at rated speed at no load?

2 Answers  

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