Answer / raxit

the function of pulse transformer is to provide isolation between control circuit and power circuit.

Answer / himanshu

Pulse transformer gives pulses to gate unit of thyristers
for conduction

Answer / bhavneet

The transformers are generally dI/dt modules but where in
there is requirement of transformers in switching the sudden
change in current offers very high inductance, which can
distort the output waveform. If the input square wave the
output might be distorted to trapezoidal forms or can have
transients going back into the input line also, as in case
of inverters. A pulse transformer is very very low on
hysteresis and can transfer almost 1:1 input waveform to
Output. Also thereby eliminating any time lag in the
pulse.Its feasible for lower currents but for higher
currents its very very expensive to produce.

Answer / revathi

It is feasible lower current.It also transfer input waveform to output.

what is star delta starter? how it works? give its control and power diagram.

0 Answers   Bhel, Point to Point Solution, Star Wire,

---

Why is ignitor used in sodium vapour lamp

1 Answers  

---

We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?

1 Answers  

---

The principle of switching circuits for different types of batteries in application of storage systems

0 Answers  

---

Which device of PlC does share load between DG sets when DG are running in perallel?

0 Answers  

---

---

Megar test tell sufficient resistant

1 Answers  

---

how we decide wire gauge for ac or dc coil and what is the basic diff. B/w these two coil?

0 Answers  

---

how to identified power tranfer line is how much KV????

5 Answers   Essar,

---

Why we oil in tranformer/

5 Answers  

---

If anyone would like to know or practice for FEWA papers contact me on mohamedrashad2@hotmail.com Just completed the supervisor exam in April 2021

0 Answers  

---

I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  

---

why we setting 95 deg and 105 deg in wti and oti of distibution transformer ? give the reson for that ?

0 Answers  

---