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.

I did oil BDV test of 1600 KVA trafo 20KV/400V as per IEC 156. Result is 1) 58 KV 2) 58 KV 3)40 KV 4) 50 KV 5) 58 KV 6) 18 KV. Avr is 47 KV. Can we say oil is still ok even in the 6th test BDV is 18 KV ?

1 Answers  

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why fault current always calculated for 1 seconds?

3 Answers   Coca Cola,

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What is meant by stator?

0 Answers  

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my question is that....few days ago i had installed a three phase motor starter for an electric saw.the motor will run and make the hydraulic pressure which will be goes to pressure cylender by up and down lever.two number of limitswitches are also installed on cylinder for safety of motor.now when the arm of cylinder reaches to the upper or lower limit it will cut the motor's line.and motor will be stop.now wana know that what will i do that motor runs continue after the limitswitch cut it down but it shold not be made any pressure.pls answer me in brief.

3 Answers  

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what is full wave bridge?

4 Answers  

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Sparking occur when a load is switched off because the circuit has high – a.) Inductance b.) Capacitance c.) Resistance d.) None

3 Answers   Ecil,

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how to set time from star to delta starter

2 Answers  

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can we use ac ameter as dc ameter with ct

1 Answers  

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can we produce cosine wave instead of sine wave? will it usefull?

4 Answers   BARC,

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If auto trip is operated, can you close the breaker.

2 Answers   KSEB, L&T, Siemens,

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working of bulb?

1 Answers  

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synchronous motor of 13.5MW having which type protection? and how to set relay?give me relay setting calculation for different protection for this motor assume efficiency,power factor and other term if neccecery

1 Answers  

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