Answer / n. ramesh

Power distribution network is supposed to have a voltage
drop of around 4%. As the utility provider has to assure a
three phase voltage of 415 V at consumer's metering point,
the secondary phase to phase voltage of the distribution
transformer is specifed at 4% higher than standard three
phase-phase to voltage of 415 V, which works out to 433 V.

Answer / n manivannan

Appliances rated voltage is 415V. If Trasformer is specied
at 415V, it will further drop down at receving end and
appliances may not work

To compensate Voltage drop at receiving end

Answer / ash

433V is the no load voltage. that is when the transformer
is supplied at its HT side but without any load connected
to the LV side.

Answer / sagar surve

Appliances rated voltage is 415V. If Trasformer is specied
at 415V, it will further drop down at receving end and
appliances may not work

Answer / gopalen sv

When the transformer is installed near to the LV distribution and no significant voltage drop occurs because of short length of cables then the problem of high voltage like 250 volts in single phase results in many fused bulbs. Motors rated at 400 V will experience 430 plus volts. Before deciding secondary voltage such conditions should be taken into account.

Answer / andy d

It is to do with the transformer % impedance, As mentioned open circuit LV side of a transformer would measure 433V, Fully loaded the transformer volt drop is equal to the % impedance. A typical 1MVA DY11 transformer would be around 5% impedance at full load, i.e. the secondary voltage reduces voltage to 411V. This is a lower value then 415V however it is not advisable to run transformers at 100% if you want a long life.

Answer / dheeraj

It is a standard

Answer / percy

433 IS LILNE TO LINE VALUE OF 250

415 IS NOT DIVISIBLE BY 1.732

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.

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