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
- 49178 Views
- Deccan Cements, Doosan, Torrent Power, Transco, I also Faced
- E-Mail Answers
Answer Posted / pradeep maurya
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
pkmauryain@gmail.com
| Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
what is the function of anti pumping relays? what is KVAR? How it is generated in alternator? What is 3rd Harmonics? What is IDMT relay?
what is difference between elr and R eartl realy.
What is a copper loss or i2r loss pc?
physical identification of HT & LT panel
What is the instrument to check the rotating diode fuse of alternator in running conditions?
HELLO SIR, IAM PREPARING HPCL EXAMS. SO PLS SEND MATERIAL OF HPCL ELECTRICAL ENG..TO VIJAY_8888@YMAIL.COM
How we can come to know the substation range,without go through any name plate ?
Can we use shunt trip coil instead of trip coil with protection relay for protection?
how oil in the MOCB was reduced compared with OCB? what are the features of the MOCB?
What about electrical Units. discrive in detail
What descriptive information does the NEC require to be marked on all conductors?
What is Delta Connection? What is meant by Forward Delta & Reverse Delta & How Will be the Connection in Power Transformers?
As we use capacitior bank in 3ph ckt for improvement of PF, why not we use capacitor in single phase domestric use, at our house their are many inductive equipments,like fan,mixer,tube choke,air conditioner they also draw PF... by using capacitor can they improve PF. if yes--what are advantage and how to connect a capactor in single ph,and which type of capacitor if no- what are disadvantages.
Explain about Leakage Test.
In Power Line Communication (PLC) the wave trap is used to block communication signals from entering neighboring lines. My question is this: Why do they allow for different filtering arrangements on these wave traps? Isn't it always going to be a low pass filter since we want the power frequency to go through, and the comm signal blocked?
