Answer / mohd shoeb khan

scr is a three terminal& four layer device.the function of
scr is to control the speed of motor and work as a switch
for large amount of power rating.

Answer / ajay dhiman

speed control of motor

Answer / sandeep

For variable out put voltage with fixed input voltage

Answer / harsh zala

SCR is a device from Solid state family. It can be used as
a switch in electrical system, means high speed switch, for
e.g Inverter, for convertign DC energy into AC energy.

Is is having high current capacity,For speed control of AC
and DC motor we can use SCR but we should have very fine
controlling ckt.

It can replace conventional spped control methods like
resistance control and at the same time can offer less
power consumption.

Due to advancement of power electronics we can use it in
practically many electrical application such as

1) Chopper ( Fixed DC to Variable DC)
2)Inverter ( Fixed DC to variable AC)
3) Cycloconverter ( Fixed AC to variable AC)

Answer / thamizh selvan

in short.. it can be used as a switch.
when gate voltage is applied, it conducts and when gate
voltage is not applied... it does not conduct.
hence it can also b called as asemiconductor switch

Answer / jitender kotwal

As by name it is clear that it is a rectifier device but
in SCR we can rectifier the voltage at desired phase angle
by means of the grid so in havey rectifiers the mattalic
scr are used ,SCR are also used in invertors,motor speed
control,etc

Answer / narasimha rao

it is also called as thryistor.
it can be used as a switch.
scr is to control the speed of motor and work as a switch for
large amount of power rating.As by name it is clear that it
is a rectifier device but
in SCR we can rectifier the voltage at desired phase angle
by means of the grid so in havey rectifiers the metallic
scr are used ,SCR are also used in invertors,motor speed
control,etc

Answer / bhavin

scr is a three terminal and four layer device.the function
of scr is to control the speed of motor and work as a swith
for large amount of power rating.

Answer / marickson kado

switch current.

Answer / a.ramesh

scr is used converting AC voltagn into DC voltage

why is the HT voltages are in multiples of 11KV

1 Answers   Clariant,

v=I*R, i.e V is directly proportional to I. now P=V*I. so V=P/I. thus v is inversely proportional to I. so what is the correct one? If both are correct than for which kind of condition this 2 differ

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salam, hi, how to calculate british temperature unit (B.T.U)?

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3 phase supply is there Total kw 100 howmuch cable put the load

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a new 3ph induction motor doesn't rotates their ratted speed, why ?

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if a single phase 3 hp submersible pump of Crompton Greaves is moving in reverse direction and sometimes it moves in rigth direction ,then what may be the cause....

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What happens if we give ac supply to dc shunt and series motors individually

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Why we use duplex coil and hook switch in telephone system?

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how is reactive power controlled on the transmission system

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers  

How the circuit breaker is selected for Induction motor of 100 kW, 415 volt, 0.85 power factor, 0.95 efficiency ?

0 Answers