Answer / rites

diagram is simple if u can imagine

3 phases are connected to incoming side

output 3 phases are connected to motor (motor in delta)

in each phase there are antiparallel connected thyristors.

all these thyristors firing angle is slowly changed to make
full voltage available to the output.

so what softstarter is doing applying gradually increasing
voltage up to rated to motor.

there is no control over frequency or current.

Typically take 5 to 20 seconds to ramp up.

Answer / sennapparajan

well... here we cant post such a diagram. soft starter
nothing but a starter. if will be connnected parellen with
normal DOL stater. and soft stater contacter and DLo
starter would be interlocked electricaly and mechanically.

At starting when u press the starting button the soft
starter contactoe will be closed when motor reach normal
running automativally (time setting) the S/S contactoe will
drop down and DOL starter contactor wil pick up. then motor
wil keep on running in DOL starter.

Answer / rvg.msceb

No one can give u such diagram, unless there is some commercial implications. For your kind understanding,
softstarter is nothing but a variable transformer, can be
of conventional type, or modern triac based. The
requirement is to vary the supply voltage applying to a
high capacity motor.

What happens with squirrel induction machines if the ends of rotor conductors are kept open? Explain

3 Answers  

---

For a 500 MVA 400/220/33KV transformer following data given HV power = 500 MVA IV power = 500 MVA LV power = 5 MVA If input power is 500 MVA then how output power is (500+5)MVA. Can anyone help

1 Answers   MEIL,

---

what is the difference between an alternator and a synchronous motor

0 Answers  

---

Classify drilling machines.

0 Answers   Ashok Leyland,

---

Explain difference between aluminium coductor & copper coductor.

4 Answers  

---

I want to ask a question which i faced during testing of Capacitive Voltage Transformer in AIS. We have measured the C1 , C2 individually , but when we start to measure the total C1+C2 , the testing equipment shuts down and says low loading. Kindly is it possible to find the total capacitance by using measuring device. kindly briefly explain the procedure.

0 Answers   AIS,

---

why rating of motor in HP?

11 Answers  

---

what is ratio of copper wire size and current ?

0 Answers  

---

if you short the any 2phase(R,Y,B),why fuse get blown?

5 Answers   Steel Plant,

---

If a line which is drawing approximatly 2100amps what should be earthing streep size(using galwanize streep)?

2 Answers  

---

in industrial lighting in each circuit how many lamps can be given? and how much load can be put on each circuit? is there standard for this? please help me with the standard description?

3 Answers  

---

Suppose i Have an Ac motor of 25Hp 1500 Rpm 50 Hz Can i run a motor 2500 Rpm by AC drives by increasing a frequency either it safe or not ....

2 Answers  

---