Critical rate of rise of current - thyristor , Electrical Engineering

Critical Rate of  Rise of Current

The maximum  rate of  increase of current  during  on state  which  the SCR  can tolerate is called  the critical rate of rise  of current  for  the device. This is specified at maximum  junction temperature. During  initial period  of turning on only  a small  area  near the  gate conducts the anode  current. If  the  current  increase too fast  localized overheating may take place. This  is called the  hole storage effect. Due to localized  heating the device may get permanently  damaged. To day devices are available which  can withstand rate o fries of current damaged. Up to 200- 250 a microsecond however in application  this rate  is hardly allowed to exceed beyond 5-10 a micro  second. Protection against  di/ dt  is provided  by series inductor.

 

Posted Date: 4/2/2013 8:05:02 AM | Location : United States







Related Discussions:- Critical rate of rise of current - thyristor , Assignment Help, Ask Question on Critical rate of rise of current - thyristor , Get Answer, Expert's Help, Critical rate of rise of current - thyristor Discussions

Write discussion on Critical rate of rise of current - thyristor
Your posts are moderated
Related Questions
what is the reason of low meagger result of dc motor

I would like to know if you can help me with the attached microprocessor assignments my email address is . also let me how much in cost in $US

Q.   Two shunt wound generators running in parallel supply a total load current of 4000 A. Each generator has an armature resistance of 0.02? and a field of 40?. The fiels are exci

Q. Explain about For Loop Construct? The loop build causes the for loop to be splitted into portions and portions shared amongst threads in team. The syntax of loop construct

why is a delay line used in the vertical selection of oscilloscope?


Calculate the monthly electric bill for TESTU.  Metering is as follows: B 00,000 kWHr C 00,000   kVARHr D 0,000        kW  peak demand Facilities Charge = $500

three application of microprocessor

Q. Consider the circuit of Figure with V S = 94 V, V Z = 12 V, R = 820 , R L = 220 , R S = 0, and R Z = 25 . Assume the reverse saturation current of the zener diode to be

The new kitchen is to be 20feet long and it''s width is 75% of it''s length. The door to the kitchen is on the short wall and is 10% of the width of that wall. you want to put in m