Answer / pillay

A soft starter is actually an electronic motor
starter.Instead of using a star delta or a auto transformer
or rotor resistant starter where with the aid of cont actors
and the devices the starting current is reduced to prevent
damage to the motors the machines driven by them or prevent
interruption to the power supply.
The soft starer does the same job but with the advantage of
you being able to preset the starting time and the starting
current consumption.You will be able to determine how much
torque can be given for the starting, but once the starting
is done the soft starter is excluded from the circuit WITH
THE HELP OF A BYPASS CONTACTOR but sometimes maintained just
for monitoring.

1. for eg, capacitor is used for many purposes(it act as filter, oscillator, bypass capacitor, memory storage etc...) 2. Please tell me some example circuits for different uses of capacitor( whenever and whereever and however we used capacitor as a filter, oscillator tuning etc..) 3. similarly for inductor and resistors(it act as what?) and when and how we want to act as like that?, and how we can used these components depends upon our requirments with example circuits and explanation? design to act as these components depends

0 Answers  

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Whats the diference between Induction motor and servo motor

3 Answers   Essar, PMT Machines,

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synchronous motor of 13.5MW having which type protection? and how to set relay?give me relay setting calculation for different protection for this motor assume efficiency,power factor and other term if neccecery

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What does bode plots shows?

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If one d.g. is unable to take full load of system, then second d.g. will take care of partly Load.for this condition RPM of both DG set should be equal.By using Synchronization panel RPM of dg sets are match, is it true?

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what is the voltage present in the telephone?

10 Answers   Infosys,

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WE HAVE A PROBLEM THAT THE MAIN DRIVE OF OUR CEMENT MILL HAS AN EARTHING PROBLEM?TWO OF STATOR WINDINGS INSULATION HAS BEEN COLLAPSED DUE TO AGING PROBLEM.THE PHASES HAVE BEEN BYPASSED AND NOW THE LOAD HAS BEEN INCREASED.WE CAN'T REPLACE THE MOTOR.KINDLY HELP ME BY GIVING SUGGESTION THAT HOW TO MAINTAIN THE STARTING TORQUE AND CURRENT FOR HIGH LOADS.

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what will happen if ac power supply is given to the rotor of an alternator

1 Answers   Goldman Sachs,

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Define liftable weight of a transformer? Does the total weight of transformer include oil weight?

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can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

0 Answers   UPSC,

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if we give 60 hz single phase supply to the transformer used in europe , than what will happen

0 Answers   Core Logic,

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A 3 phase motor operating off 415V system is developing 20Kw at an efficiency of 0.77 and power factor of 0.73. determine:- a)the line current. b)the phase current if winding are delta connected. c)the phase voltage if winding are star connected.

1 Answers  

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