Answer Posted / karthik

so many soft starters is available in market.fews are abb
siemens,power boss etc.soft startesused to minimise the
starting time of a motor and limit the current also.in
starting time aalso we limit the input voltage of the motor.
Ramp Up
Ramp Down
Pedestal
Step Down
Supply Frequency
Current Limit Time
Current Limit Level
Kick Start Time
Kick Start Level
Arc-less Switching above all parameters also we adjustable n
soft starters.

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%

1877

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Why reactors use before incoming of ac vvfd drive?

1816

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What do you understand by oldham's coupling ?

1036

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what is the difference between 4pole & 6pole DC Motors & give advantage ?

1869

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what is W.T?specify the acceptable range?

1925

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what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)

1751

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STATE WORKING OF VACCUM CIRCUIT BRAKER?

1892

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3Cx240 & 3Cx300 sqmm Al. cable from lv side. What is the calculation for this cable??

1370

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What is the high series capacitance winding on high voltage power transformer ?

2131

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How to do stting of vl250 siemens MCCB

2922

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what is the difference between STAR and DELTA connection and application wise how it can be utilizedd

2176

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The magnitude of sum of two sinusoidal av voltage is equal to 230 volt.the magnitude of each individual voltage is also equal to 230 volt.what must be the phase difference between voltages?

1581

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if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?

1383

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What are books to be referred for KPTCL exam?

3643

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what is basic difference betmeen normal & flame proof motor??

2134

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