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
- 49170 Views
- Deccan Cements, Doosan, Torrent Power, Transco, I also Faced
- E-Mail Answers
Answer Posted / v .selvakumar
knee point means at which the core tends towards
saturation .magnetising current means to produce flux in
the core it will take some current it is called magnetising
current.before knee point the graph between Vk and Imag
will be linear,at which point linear curve getting
disturbed .
| Is This Answer Correct ? | 31 Yes | 9 No |
Post New Answer View All Answers
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
if 12v battery get discharged for 2 months after if we put charge it will charge again?how much time it will take to charge?
why we take movement of rotor always in counter-clockwise direction in 3-phase induction motors?
how diside ct mf exmp.200/5 ct
What are the Return ( Monthly / quarterly/ Annual submitted to Electical Inspector for an establishment (Factory in Maharashtra-- Small scale category having seperate HT line of 22KV ) as per Maharashtra Electricity Act
1.what is difference in maintain Hz again Hz in USA ? 2.how to calculate the battery AH? 3.why are yearly maintained in transformer how many tests in required?
How do i perform grounding of star point of Genset (400V) for making connection with step up transformer of DELTA-DELTA (400V to 20KV) ? while Genset itself has its own neutral and grounding bus bar inside genset breaker box whereas we have another neutral and grounding busbar in synchronizing panel next to genset at maximum distance of 6meter, would someone pls advice if we can only perform neutral grounding in synchronizing panel or should we ground neutral on both places inside genset breaker box and synchronizing panel.
what would u consider to be the basic purchase order information you would need to proceed with a cable inspection assignment?
What is meant by Im=30mA@Vk/2. How to know the kee point voltage for CT design
please send me previous year questions of jspl through which i could prepare myself for the test.
does the Trivector Meter of three phase automatically takes care of the low power factor and gives the reading accordigly or it does not take care of the Power factor while giving the readings please explain
please send me jindal previous aptitude and technical question and answer.my email id is deep_raj@live.com
Can any body tell me the different types of LT cables & their application.
what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors
how to handle 2500 kva transformar
