how to calculate knee point voltage of current transformer?
- 20 Answers
- 149936 Views
- Bhel, Bhilai, Jackson, I also Faced
- E-Mail Answers
Answer Posted / rajkumar
Knee Point Voltage Vk = IFsc * K * (Rct+(2*RL)+Rr)
Where,
IFsc - Fault current at the secondary of CT
IFsc->IFprimary/CT Ratio
IFprimary -> Fault MVA at primary/(1.732*Primary Voltage)
K - Dimensioning Factor
Rct - CT Resistance
RL - Lead Resistance
Rr - Resistance of relay to which CT is connected
Knee point voltage is the voltage at which 10% raise in secondary voltage will result in 50% raise in current..
| Is This Answer Correct ? | 2 Yes | 2 No |
Post New Answer View All Answers
Grid fault level [KA]?
what are the advantages disadvantages of connecting high voltage block( 1:1 transformers) transformers between the turbo generators and busbars.
how circuit breaker work.. what is the operations taking place inside a circuit breaker when an overcurrent occurs... is it similar to fuse?
Explain about technical and non technical losses in distribution system?
Name the test signals used in control system
salam&hi, i need to know about how can i calculate an enough current for the new building before i submit it to the suppliers
What is the principal of motor?
What is the type of earth fault protection used in battery? explain.
Why does curving the pole faces in a dc machine contributes to a smoother dc output voltage from it?
after how many spot we must chang secondry cable in portable spot welding gun?
What is the breaking capacity of transformer and how can we calculate the breaking capacity of tranformer
I am inpecting a 10kVA UPS what tests should i do and should i observe?
what are the different kind of cables used for transmissions?
1- What is the Polarization Index number be good for 15KV 3c#500MCM electrical cable? 2- Can I use the IEEE Std 43-2000 to perfom the PI test? Thanks
what is the use of permanent magnet generator in exciter
