what r substations?what r there work?why voltages r incresed and then reduced during distribution of power

1927

Why the standard of ambient teperature mentioned as 40 degree celcius in machines.

1965

Can we use Ccapacitive voltage transformer directly for metering purpose?

1863

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 0for 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.

2034

what is the function of impulse relay

2521

what type questions asked in hp cl

1863

i want wipro vlsi placement pattern please send me

1776

what should be sensor sensitivity of accelerometer in vibration? And what is the main difference between accelerometer and proximity sensors and others?

2506

How can we demolish concrete beams?

2342

Why can't we use antifrictional bearing in place of journal bearing in a 660mw plant

2021

explain the types of drives

1977

what is purpose of use stug.

2423

what is the techanical difference between german standard & japanese standard.

2082

Tell us what is shape factor?

1

where can the transformer having vector group Yny0 be used??

4124