Interested to Buy Any Domain ? << Click Here >> for more details...
how netral CT is selected (including its details
specification)
- 8 Answers
- 44142 Views
- ABB, ABC, dbpl, Mecon, Shree Engineering, Tapasya Transformers, I also Faced
- E-Mail Answers
Answer Posted / bikash chandra pal
Neutral CT is generally used on earth connector connecting
the earth or ground & the star point of a Generator or
Transformer.
Neutral CT is selected based on the value of designed the
earth fault current which is supposed to return to
transformer or generator star point from earth.
Process of selection:-
primary rating : Designed E/F current x 1.2
Secondery rating : normally selected as 1A(reason being,
the distance between the relay & NCT which is located on
transformer bushing is generally longer),However, if the
distance is lesser & approximately within 25M, 5A secondery
also may be selected.
Accuracy class: To be selected based on application,eg: for
Stand by earth fault protection(51G) it may be 5P10. For
restricted earth fault protection(64R), PS calss CT is
applicable Vk to be calculated,Imag to be chosen based on
relay mnf's reccommendation. For Neumerical CT,mnf's
guideline need to be adhered.
BIL: based system requirement & CT construction(eg. for
window type CT system BIL is not applicable, as by virtue
of it's construction it is LT CT as primary is full voltage
isolated.But for BAR & wound type epoxy cast CT system BIL
is applicable.
Trust the above is clear. feel free to ask for
clarification if any
| Is This Answer Correct ? | 31 Yes | 3 No |
Post New Answer View All Answers
Explain what is electric traction? Explain few advantages of electric traction system?
how copper and aluminium wires or cables are choose for current rating? please provide copper and aluminium wire selection chart for different current rating ?
how to find out 3 phase complex power in per unit in unbalanced system?
Transformer how to maintaince a check b check c check d check
sir, i am 3 years diploma course pass out candidate.what type of certificate can i got in marine service.
what is the meaning of 5% droop or 7% droop in AVR?
Why the magneti fields are not passes from southpole to north pole
What type of pipe material G.I or M.S is used for sprinkler system?
what is charger supervision and control supervision?
What is the RME and explain the full form and what is the RME work?
In cable sizing calculation (determining the max route length of cable) why we choose the shortest length between cable length of full load current Iflc & starting current Istart?
why the NGR (neutral grounding resistor) always OFF during DG off?
What is the formula to calculate the size of Aluminium and copper cable?
in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.
harmonics filter
