I need to make a circuit for switching ON and OFF a Permanent magnetic actuator for MV circuit breaker.
Source: 200V DC after 50A bridge rectifier from 230V AC Supply
Solenoid: Made of 17 SWG, 480 turns, 9 Ohm. IGBT will switch it ON from the Supply. So it will draw about 24/25 Amp. Duration of current flow is very short less than <100ms. Once the Plunger moves in the Permanent magnets take over and the power supply is cut off. Frequency of operation may 6 operations per hour. What rating IGBT should I choose and what kind of snubber circuit would be required?

 

That description is not adequate to allow an adequate understanding of the application. So it is not possible for me to provide what I would consider a safe and useful suggestion.

 

BUT if you are going to switch a 50 amp DC inductive load, I suggest a relay. DO NOT use diodes for any suge suppression, but be certain that the contact gap opens far enough to quench the spark. Really, you should stick with the AC, or use unfiltered DC.

 

Use a zero switching Triac on the AC side, see Fairchild App. AN-3006

 

A solenoid wound with #17 STEEL WIRE (17SWG) will certainly develop heat quite rapidly.
STILL, the description does not make much sense. AND, what is an " MV circuit breaker."???

I have learned that in some localities breakers are referenced by size, rather than application.
"MCB" meaning Miniature Circuit Breaker.! Elsewhere MCB means "Main Circuit Breaker"!!!

 

MV circuit breaker usually difines a voltage level, between 1 kV and 52 kV.

 

9 Ohm AWG17 is 526m long. since there are 480 turns, that is 1.096m per turn . if the form is rectangular, that means cross section area is 274mm x274mm or 10.8"x10.8". that is hard to believe...

also getting 200VDC after full wave rectification of 230VAC is hard to believe. where did the other 100V go? that was supposed to be 324VDC.

but if this is really the voltage obtained, then max current is 200VDC/9Ohm = 22.22A. so switching transistor will need to handle more than that.

 

9 Ohm AWG17 is 526m long. since there are 480 turns, that is 1.096m per turn . if the form is rectangular, that means cross section area is 274mm x274mm or 10.8"x10.8". that is hard to believe...

also getting 200VDC after full wave rectification of 230VAC is hard to believe. where did the other 100V go? that was supposed to be 324VDC.

but if this is really the voltage obtained, then max current is 200VDC/9Ohm = 22.22A. so switching transistor will need to handle more than that.

What I hav3 seen is that odd numbered wire gage sizes are seldom copper, but mostly steel. And a circuit breaker with the trip launched by a solenoid but completed by a permanent magnet is quite unusual.
In fact, every aspect of this application appears to be very unusual. So I am suggesting that an additional description of the switching system will be quite educational. With the limited explanation so far I find it difficult to provide any applicable advice.

 

What I hav3 seen is that odd numbered wire gage sizes are seldom copper, but mostly steel.

Spent the last 22 years of my career using motors built with Essex Wire AWG 17 Magnet Wire. Came in 84 pound spools. Not familiar with other brands but Essex Magnet wire comes in plenty of odd number AWG sizes. Common material is copper and aluminum.

A Google of SWG or AWG 17 will bring up plenty of copper wire as used in solenoid coils and motors. The merit to higher voltage was lower current.

Not knowing more as to application I would likely go with a MOSFET.

Ron

 

Use a zero switching Triac on the AC side, see Fairchild App. AN-3006

Switching AC is always easier than switching DC, for the simple reason conduction self-extinguishes on the zero crossings.

 

Spent the last 22 years of my career using motors built with Essex Wire AWG 17 Magnet Wire. Came in 84 pound spools. Not familiar with other brands but Essex Magnet wire comes in plenty of odd number AWG sizes. Common material is copper and aluminum.

A Google of SWG or AWG 17 will bring up plenty of copper wire as used in solenoid coils and motors. The merit to higher voltage was lower current.

Not knowing more as to application I would likely go with a MOSFET.

Ron

OK, and thanks for the education. I have specified lots of motors by power, speed, and voltage, and never been concerned about the size of wire used inside. It appears that I have been sheltered from this detail. So I learned something new today.