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

Answer / sonu pal

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.

Can We Apply DC POWER To Transformer???? And Why????

4 Answers  

---

Why 1/3 is used in symmetrical components?

0 Answers   ABB,

---

what is the need of starter in tube light and what type of starter is used in that?

0 Answers   Sedemac, Sepco,

---

hi can you give any body fault level calculation, generator fault level calculation,transformer fault level calculation for system fault level with equation? i have 3.3kv generation voltage three gas gen sets, one is 1.9MW,2nd is 2.5MW,& 3rd is 3.8MW & i have 11 kv generation voltage one gas gen sets is 3.8MW, we are step up to 22kv by transformer

3 Answers   Hindalco, Piramal Healthcare,

---

why the Different manufacture's rating of Gas genset are different? i.e : cummins genset rating is in KVA .( 625kv). While GE- Jenbacher make genset have rating in Kw. (625 kw)

1 Answers   L&T,

---

what is T P N bus bar

1 Answers  

---

is dc shunt moter oprate on ac? if no why? if yes how?

8 Answers   IOCL, JJJ, Power Grid,

---

how to calculate the megger values for motor, cables and transformers?

2 Answers   ITC Infotech,

---

what is difference between low voltage and high voltage

3 Answers  

---

what is the HT motor current setting (Motor protection relay)aganist FLA If the capacitor is connected in parallal to the motor to increase the P.F from 0.89 to 0.99. the setting is to be reduced. what is the formula for to calculate the current.(FLA - CALCULATED CURRENT!= )

1 Answers  

---

what is meant by motor startup supervision & motor load jam protection ?

0 Answers   ABB,

---

What is the basic principal of Diesel genarator?

3 Answers   Juniper Networks, MRF,

---