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Question
What is CBCT ? Why & Where it is used?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
it is used for earth fault protection,this kind of C.T
covers all the phases ,the secondary side of it is
connected to trip coil of CIRCUIT BREAKER.Under no fault
conditions the vector sum of all the three phase currents
is zero so no output to c.t secondary but when there is a
earth fault ,the sum would not remain zero and the trip
coil would act and circuit breaker would trip.
the disadvantage being that it would not detect phase to
phase fault,seldom used,not seen anywhere in my plant.
 
Is This Answer Correct ?    51 Yes 3 No
Perservance
 
Answer
# 2
CBCT stands for Core balance current transformer, it is
used in Main incommer pannels as of my experience.
 
Is This Answer Correct ?    49 Yes 10 No
Veerachary
 
 
 
Answer
# 3
CBCT is core balance c.t it is used at where we could not
use earth.because at balance condition Ir+Iy+Ib=0 when
balance will be distrube current will be induced in cbct
secondary.
 
Is This Answer Correct ?    17 Yes 6 No
Maharajan
 
Answer
# 4
Core balance CT (CBCT): The CBCT, also known as a zero sequence CT, is used for earth leakage and earth fault protection. The concept is similar to the RVT. In the CBCT, the three core cable or three single cores of a three phase system pass through the inner diameter of the CT. When the system is fault free, no current flows in the secondary of the CBCT. When there is an earth fault, the residual current (zero phase sequence current) of the system flows through the secondary of the CBCT and this operates the relay. In order to design the CBCT, the inner diameter of the CT, the relay type, the relay setting and the primary operating current need to be furnished. 
Is This Answer Correct ?    8 Yes 1 No
Sarbani
 
Answer
# 5
Core balance CT (CBCT): The CBCT, also known as a zero
sequence CT, is used for earth leakage and earth fault
protection. The concept is similar to the RVT. In the CBCT,
the three core cable or three single cores of a three phase
system pass through the inner diameter of the CT. When the
system is fault free, no current flows in the secondary of
the CBCT. When there is an earth fault, the residual current
(zero phase sequence current) of the system flows through
the secondary of the CBCT and this operates the relay. In
order to design the CBCT, the inner diameter of the CT, the
relay type, the relay setting and the primary operating
current need to be furnished.
 
Is This Answer Correct ?    5 Yes 0 No
Abhishek Singh
 
Answer
# 6
CBCT is core balance CT. In normal conditions and phase
faults conditions (3ph or ph-ph) the output of the CT is 0.
In case of earth fault only there will be current which
will operate a relay and trip CB as for other protections.
 
Is This Answer Correct ?    6 Yes 2 No
Anil
 
Answer
# 7
cbct is core balance current transformer it for earthfault .
sum of all phases zero it ok, if any difference . So trip bkr
 
Is This Answer Correct ?    3 Yes 0 No
Parthsharathi
 
Answer
# 8
But for which purpose it is used & how to install it? 
Is This Answer Correct ?    10 Yes 12 No
Piyush Rana
 

 
 
 
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