WHY HUMMING SOUND OCCURED IN HT TRANSMMISSION LINES ?
Answer Posted / karthikeyan
because of carona effects
| Is This Answer Correct ? | 59 Yes | 6 No |
Post New Answer View All Answers
(In MEP services) HVAC in AC Plant room what else can we provide if the chiller is not considered?
How is the resonant peak, resonant frequency, and bandwidth determined from nichols chart?
could an induction motor be used for regenerative braking in electric-train control? in this type of application would some scheme have to be devised to obtain low synchronous speeds while braking? would induction-motor drive, therefore, be suitable for passenger service?
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.
How many Zones can be in Conventional type fire alarm system & how can we detect the fire in Conv. type FAS?
please forward me the type of questions which would rise while me attending to 33KV Electrical License to my mail ID:vadrevu_raghava@yahoo.co.in
what is a bus riser in power system and why it is used
why a tester wont shock while testing the power in house
What are the conditions to be satisfied for parallel operation of dc generators?
Is there any standard guidelines/Criteria to design NGR/NGT.?
why the check zone and main zone are used for Busbar Protn. scheem?
What are your personal skills and abilities for such a Master Course and your possible preparation to undertake this course?
is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.
What is mean 2XWY
Please define ampere?