What is Vk and Imag i.e Knee point voltage & Magnetising
Current?
How to calculate above values?
How to define accuracy class 5P10?
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
For RCD (Residual current device) Icu is defined. How i can find Ics for them?
What are the major reasons for balancing hydro-thermal mix?
Explain different types of d.c motors? Give their applications
If we need 4c× 50mm sq cable but it's not available so we can pull 4c×25mm sq two cables?
What is the direction of current flow in ct secondary...means if the current is flowing from P1 to P2 then what will be the direction of current flow in ct secondaryw
why ht cable end termination don't have a gland?
What is servo motor and what are the applications of servo motor?
What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?
What is polar plot?
What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?
What is FM200 Gas??Applications........
Why AC & DC capacitor are use in UPS ??????????????????
Why field rheostat is kept in minimum position while armature rheostat at maximum position?
Give accurate definitions for these electric terms: Inductor Inductance Inductive Induction Reactance Reactive Esam Baraka ٢١ ساعة
armature winding of dc machine produce alternating emf then it convert in to dc by using commutator.But only we consider armature resistance why don't we consider inductive reactane effect?