Unfortunately, WikiAnswers does not support graphic images, so I will have to describe the connection in words.

There are three windings, each with two wires. That is six connections. There are four connections in a star (wye) source, three hots and a neutral.

The star connection has one end of all three windings connected (together) to neutral and the other ends connected to each hot.

The delta connection has each winding connected end-to-end to each other in a ring, and each common point is connected to a hot. Neutral is not used in delta.

Leading power factor has no advantage as the apparent power will be greater than true or active power...

So power factor should be as close to unity as possible...

Lagging p.f. causes high currents in line, whereas leading p.f. causes over-voltages.

first calculate the full load amps of the motor by using formula,

line amps = KW * 1000 / (line volts*1.732*P.F)

Of the mentioned motor the amps will be 96 amps at the P.F 0.8. The motor will have star delta starter so the cable size would be 2 runs of 3c x 70 sq mm AL if laid in air.

Basic componets of a plc are: power supply, CPU(central prossesing unit), I/O CARDS ( INPUT/OUTPUT CARDS)

25 amps, 6000 watts

That might be to make it run the right way.

type 1 is auto reset

it cools off and turns back on

Type 2 is power off reset

turn power off it will reset

type 3 is manual reset

you must turn it off and back on

This is the safest.

The only one I would ever use.

Fuses are far better the contacts cant weld shut with extreme overload

you know something is wrong

so you can see if you mowed the cord with the lawnmower

tossed the blender in the sink

circuit breakers work when something goes badly wrong

type 1 and 2 decide that some magic fairey

has corrected the problem and its ok to apply full power again

Next time on the roads, don't scoff at the speed-breakers. They could actually light up small villages off the highway.

An amateur innovator in Guwahati has developed a simple contraption that can generate power when a vehicle passes over a speed breaker. Kanak Gogoi, a small time businessman, has developed a mechanism to generate power by converting the potential energy generated by a vehicle going up on a speed breaker into kinetic energy. The innovation has caught the eye of the Indian Institute of Technology (iit), Guwahati, which will fund a pilot project to generate electricity from speed-breakers.

The idea is basic physics. Gogoi has welded five-metre-long metal plates into the speed-breaker instead of the conventional bitumen-and-stone-chip rumble strip. The plates are movable and inclined with the help of a spring-loaded hydraulic system. The fulcrum-attached plates are pushed down when a vehicle moves over them and bounce back to original position as it passes.

"When the vehicle moves over the inclined plates, it gains height resulting in increase in potential energy, which is wasted in a conventional rumble strip," Gogoi says. "When the plates come down, they crank a lever fitted to a ratchet-wheel type mechanism. This in turn rotates a geared shaft loaded with recoil springs. The output of this shaft is coupled to a dynamo to convert kinetic energy into electricity," he explains.

iit Guwahati has evaluated the machine and recommended it to the Assam ministry of power for large scale funding. A K Das, a professor at iit's design department says it is a 'very viable proposition' to harness thousands of mega watts of electricity untapped across the country every day.

"A vehicle weighing 1,000 kg going up a height of 10 cm on such a rumble strip produces approximately 0.98 kilowatt power. So one such speed-breaker on a busy highway, where about 100 vehicles pass every minute, about one kilo watt of electricity can be produced every single minute. The figure will be huge at the end of the day," he said.

The Assam power ministry is expected to back the iit pilot project.

Das says a storage module like an inverter will have to be fitted to each such rumble strip to store this electricity. The cost of electricity generation and storage per mega watt from speed-breakers will be nearly Rs 1 crore as opposed to about Rs 8 crore in thermal or hydro power stations

Actually safety devices of generator depends on the type of prime mover used in generator. The main safety devices in a DG Set is to control the over speed, to limit the fuel supply in case of emergency. It is regulated by the governor of the DG Sets. In external safety, over voltage & over current tripping relay i.e. associated with DG Sets control panel.

compensating winding is used for equal load sharing of two generators running in parallel. while interpole winding is used to minimise the effect of armature reaction by supporting the main field.

It may be an attempt to apply a "catch all" phrase as an answer, but a sawtooth generator is used to supply sweep. And sweep is used widely in electronics applications. One application might be in the search for signals in a given frequency band using a spectrum analyzer. That band, that group of frequencies, would have to be "swept" by the receiver. It would have to tune in the different frequencies in order and on a continuous basis. By applying a sawtooth wave to a voltage controlled oscillator (VCO) used as the local oscillator in a receiver, the frequency of the VCO could be swept up the spectrum from a starting point to an end point, and then it could be done all over again continuously. The correct sawtooth voltage to the VCO would enable the receiver to make pass after pass across the band under study, and the strength of a signal on a given frequency could be indexed and shown on a display.

the current carrying capacity of 16sq.mm copper conductor is as below:

For Single phase A.C or D.C is - 76 amperes (VIR insulated) and that

For Three phase A.C or D.C is - 66 amperes. (rubber insulated)

For AC system speed of generator will be decreased and then frequency decrease, if there is no trip the motor load will be automaticaly reduced as Load Power = torque x speed and speed of motor vary acc to frequency. Finally the motor will be run at new lower speed that load = power generation. The other effect is voltage in the system will be decreased and result of lower load consumption

Sir,

what is the cable size for 1.5kw 3phase induction motor 400v?

In January 2006 there were 11,817 stop lights counted in New York.

Between power and control voltage circuits

It has been some time but here goes.

The circuit breaker size can be found when some other information is given. For a given voltage value, the size of the cb is basically found using the formula

P(Kw) = IV here the value of I is approx the value of the circuit breaker. The solution is not so simple since there are normally tolerances set by the different regulator organisations as to these values.

Another situation to consider is the type of current and voltage you are using ie ac or dc, Vac or Vdc. also the amount of phases if it is ac voltages we are considering . If 3 phase ac voltage and current the formula used is as follows

P(kva) = 1.73 x IL x VL x pf where pf , the power factor is the introduced and kva the apparent power is used instead of kw here because under most conditions a power factor of 1 cannot be achieved. IL and VL are the line current and voltage.

Gladstone

Make sure there is no voltage measured between line of secondary and neutral of primary. I.e. neutral of primary and secondary are not connected by any means.

The law of induction says voltage = N d/dt (flux) which for a fixed single frequency AC becomes: voltage (rms) = 2 pi x freq x N x flux (rms), or

volts per turn = 2 pi x freq x flux.

Therefore with 50 Hz and 0.06 Webers of flux the volts per turn is 2 pi x 50 x 0.06 which is 18.85 volts per turn.

The HV winding need 318 turns while the LV winding needs 13 turns.

With a typical peak flux density of 0.7 Wb/m2 rms the cross section area of the iron core would be 0.086 sq. metres or just under 1 ft-square.