what is the meaning of knee point in current transformer and
how to calculate?
Answers were Sorted based on User's Feedback
Answer / searchvineet
every measuring type or protection special current
transformer comes with a ratio of there Ip/Is [Ip=current in
primary Is means current in the secondary] which generally
means how much minimum current you are injecting in the
primary and with respect to that how much you are getting on
the secondary.Lets say 100/1 means 1amps in secandry for
flow of 100 amps in primary.
know lets say if u inject more then 100 amps in the same CT
say 200amps what will happen??????
So the Answer for understanding the Knee point is above .
There is a level of sustaining in the CT up to which it will
work perfectly fine beyond that limit or after that limit it
will behave abnormally and there is a point came after which
it Will SATURATE that level is called as the knee point
Is This Answer Correct ? | 3 Yes | 2 No |
That sinusoidal voltage of rated frequency applied to the secondary terminals of the CT, which when increase by 10 %, cause the exciting current to increase by 50%.
Knee point voltage, V= K.Is (Rct+Rb)
K= is a parameter to be specified by customer which depends on the system fault,
Is= secondry current
Rct= secondry winding resistance at 75 deg C
Rb= impedance of secondry circuit.
Is This Answer Correct ? | 1 Yes | 0 No |
how to determine the cable size...pls explain me with the formula taking particular load....does the factors like impedance & short circuit rating influence the cable size, if so how....
1]how the voltages and frequency are achieved on ships. 2]how does the line and phase voltages are related on ships.
What is the reason behind current flow(20 A) in amain earth cable of an SMDB? Is cuurent flow(45A etc) through a neutral cable acceptable?
What is the earth treantment procedure?
If i connect aload to phase taken from one transformer and neutral from another what will happen.
what is ground clearence in transmission system.is it varies wit conductor size,height of poles,span.
how motor should be connected i.e star-delta or star-star or delta-delta ?
What are the different types of LT Cables?
what is vector diagram in three phase transformer
What will happen if 230V DC motor connected to 230V AC Supply?
15 Answers Ashok Leyland, BOC, JSW, ONGC, RRB, TRB,
What do you mean by Stimulastion Test in Diesel Genarator / Why & when it's conducted ?
what happens when dc supply is given to the transformer?