what is the Excaste meaning of CT Saturation??
10 P 20, 15 VA, what is the meaning of 10, & 20.
if the CT polarrity changed what will happened??
what is the differece between measuring CT & Protection CT??
what is the Saturation Point of measuring CT & Protection CT??
Answer Posted / ritesh ashok jaiswal
CT SATURATION MEAN CORE LOSS THE CAPACITY OF HOLDING THE
FLUX .THAT IS THERE IS NO OUTPUT AT CT SECONDARY .
15VA, class 10 P 10 CT means ratio error of prescribed
limit are constant up to 10 times rated primary current
when secondary burden is 15VA.
POLARITY CHANGE DEPENDS UPON FOR WHICH PURPOSE THE SAID CT
IS USED.
Measuring CT :-
 Use for measurement purpose.
 Accurate within the specified working range of
rated current (1% to 120% of rated current)
 Designed to saturate for more than 1.2 times
current to safe the measuring instrument from sever strain
caused by heavy over current.
 Accuracy is not required at high over current.
 High permeability core material with low saturation
level is most suitable ( Nickel- Iron Alloys).
b) Protective CT :-
 Use for protection purpose.
 A protective CT is required to faithfully transform
the primary current throughout it’s entire range from
normal load current to short circuit current.
 It should be accurate at all higher value of
current up to rated accuracy limit of primary current.
 To get high saturation level, grain oriented steel
are used for core.
GENERALLY the Saturation Point of measuring CT 30 VOLT &
Protection CT IS 300 V OR DEPENDS UPON MANUFACTURE TO
MANUFACTURE
Is This Answer Correct ? | 6 Yes | 1 No |
Post New Answer View All Answers
what are factors comes under relay setting (distance relay 7sa52) under OPEN DELTA VTs connection??
why moisture formation found in XLPE Armoured cable outer sheath
Why should we hire you over the others waiting to be interview?
What is the formula to calculate the rating of a three phase air circuit breaker
how to test the turn ratio of 3 phase transformer using volt meter shoe the curcit diagram.
how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec.
how will we calculate the copper wire load..
how to calculate earth fault relay current and CBCT ratio
If a rotary UPS is in line through grid power; What would be the impact on Power Factor if the load through rotary ups is 25% , 50% , 75% & 100%. Will the power factor reduce with less load?
explain why core loss of a transformer is almost constant under different load conditions when connected across a constant voltage and constant frequency.
What is method of calculating the fault current for a MDB, 50KW, 3PH, 415V, 50HZ?
I need model question papers for RRB section engineer Chennai... Please send to my E-mail Id:- maitheerainbow@gmail.com
What is a system?
Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??
75 kw motor take 45 amp in no load delta in star 10 amp but in load it will take 160 amp but IR velue of winding above 500 at 1kw ph to earth and ph to ph. what problem it should be?