Interested to Buy Any Domain ? << Click Here >> for more details...
IF we have 500kva transformer & know the current on HT & LT side, how can we consider for its breaker?
- 5 Answers
- 8411 Views
- I also Faced
- E-Mail Answers
Answer Posted / laxmikanta sasmal
breaker rating is selected near to the calculated current of equipment and standard rating of breakers. but it is very important to know the fault current of that
system/ckt where it to be attached.
| Is This Answer Correct ? | 3 Yes | 1 No |
Post New Answer View All Answers
What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?
what questions will be asked for 11/33KV licence interview APSEB hyderabad. Can any one share question and answers.
how can decide the current rating of oltc
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.
we specify current in case of feeder but in case of distributor voltage, why?
Why are the cores of large transformers built up of circular transactions ?
why tertiary winding is used in transformer with diagram?
What is the basis for selecting Vk/2 or Vk/4 for REF and Differential protection of Transformer and What is the significance of magnetising current
operation of protection relay watchdog contact?
how the CT and PT is connected in the circuit during testing of transformer explain with diagram
I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?
diff b/w elcb and rccb
define the non synchoronism of synchoronous machine in general g or m??
How to calculate the sag of OPGW during stringing???
State thevenin’s theorem?
