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.

1 KVAR = 1.3Amps but, 25KVAR capacitor/690V capacitor takes just 21Amps as leading current, what is the reason? Please explain...

1 Answers  

---

if transformer core is made of copper instead of steel which losses will increase..please explain

5 Answers   Bhel,

---

Define active and passive network?

0 Answers  

---

what is the healthy specific gravity of lead acid battery used in DG sets ?

3 Answers   Bhushan Power Steel,

---

Can clean earth cable be considered as low current cable

0 Answers  

---

Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078

1 Answers  

---

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?

1 Answers   KSPL,

---

can we use the same fuse for both ac and dc?

3 Answers  

---

How we calculate the size of H.T cable for any transformer & rating of busbar for any L.T. panel?

3 Answers  

---

What are the special cables required for explosion proof wiring?

0 Answers  

---

What is the method of Tan delta test for power Transformes and why it is required.

1 Answers  

---

what is the diff.between neutral and earth?

4 Answers  

---