Interested to Buy Any Domain ? << Click Here >> for more details...
What is Vk and Imag i.e Knee point voltage & Magnetising
Current?
How to calculate above values?
How to define accuracy class 5P10?
- 7 Answers
- 53159 Views
- Deccan Cements, Doosan, Torrent Power, Transco, I also Faced
- E-Mail Answers
Answer Posted / ugrasen
Dear friend,
Knee Point voltage is nothing but a point at which the CT
saturates. Thatsy its always better to design the CTs which
can operate without saturation even at a voltage appears in
the CT during fault condition. Pls find below the following
formula for calculating the Knee point voltage.
The formula for Knee Point Voltage is:
Vkp = K * If/CTR * (RCT + RL + RR)
in which,
K = Constant, conventionally taken as 2.0
Vkp = The minimum Knee Point Voltage
If = Maximum Fault Current at the location, in Amperes
CTR = CT Ratio
RCT = CT Secondary Winding Resistnace, in Ohms
RL = 2-way Lead Resistance, in Ohms
RR = Relay Burden, in Ohms
ugrasen.vishawakrma@gmail.com
| Is This Answer Correct ? | 12 Yes | 0 No |
Post New Answer View All Answers
why high speed tripping relay is used in protection circuit why not normal relay
1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be
What are the uses of lead compensator?
why would amp draw on neutral wire be as much as amp draw on the hot leg.
Shall I use 40A semiconductor Fuses in 32 A SFU ? Frame size is same. What Happen if Fuses burn on SFU?
what is the IEC standard for Power Cable installation in onshore (like in direct buried ground or above groung)
How to calculate the electrical load for a standard telecom BTS shelter and choose the DG set capacity for the same load?
What are the disadvantages of autotransformer?
the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?
How will be the single line diagram of series trip HT breaker? how it works?
how to measure the transformer resistance values(dyn11)?and howmuch the minimum value?
a 100mva,400/200v transformer has leakage impdce of 10% draws a steady state line currentof---------------
The electrical energy required to raise the tempreture of a given amount water is 200 kwh. If the heat losses are 20%, the energy required is?
What is meant by bus bar protection?
Explain the process of commutation in a dc machine.
