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.

why the rotor current becomes in steady state during high slip region? please verify with equations.

0 Answers  

---

if receiving voltage is higher than sending ones what will be the effect of receiver

4 Answers  

---

how to calculate the megger values for motors and cables?

2 Answers   Adhunik,

---

A resistor,inductor and capacitor are connected in series respectively.Voltage across resistor is 40v,across inductor is 70v,across capacitor is 100v.Then what is the total voltage applied across the elements?

5 Answers  

---

why is  use the star and delta connection and difference

1 Answers  

---

---

why the projects getting loss?

0 Answers   SBPL,

---

what size of copper busbar use for 11kv 630A

3 Answers   ABB,

---

conditions for parallel operation of dc generators

4 Answers  

---

Even when a particular generator in a generating station is under maintenance we are still able to maintain the same power output. How is this possible? Does the tie line between 2 generating stations have a role to play in it?

1 Answers   NTPC,

---

what will happen if i connect or change line with phase terminal

1 Answers  

---

Why armature rheostat is kept in maximum position?

0 Answers  

---

what types battery chargers are there?wanted with details.

3 Answers   SCS,

---