what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in c

what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree
centrigate ohm in current transformer name plate?

Question Posted / varun tripathi

2 Answers
5640 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in current transformer n..

ALF--accuracy limit factor(ratio of nominal over current to the rated current)
KPV--knee point voltage(secondary voltage must be less than KVP so that ct accuracy will not hampered)
KPV=k.Is(Rct+Zs) where Rct=resistance of secondary winding at 75 c

Is This Answer Correct ?

2 Yes

0 No

what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in current transformer n..

Answer / m.esakkiraja

1. ALF - Accuracy Limit Factor
It is the ratio of Instrument limit primary current to the Rated primary current.

2. KPV- Knee point Voltage
It is defined as a point where 10% increase in the Secondary Voltage causes an increase in the Secondary Current by 50%.

3. Iexc- Excitation current
A transformer exciting current is the current or amperes required to energize the core.

4. Rct @75°C - Resistance of Secondary winding on CT at 75°C.

Is This Answer Correct ?

1 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

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,

DEAR SIR,I GOT THE CALL LETTER FROM RRB, SECUNDERABD AS A JE-II SO PLEASE PROVIDE ME SOME MODEL QUESTION AND ANSWER PAPERS AND LAST YEAR QUESTION PAPERS

0 Answers

-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.

0 Answers

what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?

0 Answers

how to test generator protection rotor earth fault relay and locked rotor test?

1 Answers

What is the meaning of high reputuring in HRC fuse.?

1 Answers ABB,

what time should we set to come on star contacter in stardelta starter?and for what reason we hav to set such time delay range?

2 Answers

working

1 Answers

What is frequency?

4 Answers BTCL, TCS,

which one is the most common system for secondary ditibution