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Question
directional over current relay when acted & how it works
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Directionalized relays are relays that use a polarizing
circuit to determine which "direction" (in the zone of
protection, or out of the zone protection) a fault is.
There are many different types and different polarizing
methods - ground polarizing, voltage polarizing, zero
sequence voltage polarizing, negative sequence polarizing,
etc.

The basic operation of this relay is just like any
nondirectional relay, but with an added torque control -
the directionalizing element. This element allows the relay
to operate when it is satisfied that the fault is within
the zone of protection (ie not behind where the relay is
looking).
 
Is This Answer Correct ?    6 Yes 0 No
Engr. Ajay
 
Answer
# 2
the directional over current relay acting when the current
flow in perticular direction above relay setting.

It consist directional as well as overcurrent element.

the directional element sence direction of current then
o.c.element acting.
 
Is This Answer Correct ?    11 Yes 7 No
Aniruddh
 
 
 
Answer
# 3
i con't get u .plz send clear answer Aniruddh 
Is This Answer Correct ?    0 Yes 3 No
Ramya
 

 
 
 
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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. NTPC 6
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