Hello All,
I am nearing completion of a new HV psu. This time, I am doing the job
properly with due regard to safety and reliability.
My question is : Is there a "tried and trusted" way of introducing a
dead short-circuit across the supply, preferably repeatedly- apart from
shorting with the proverbial screwdriver!
I am considering making a well insulated "knife switch", with the earthy
side to the handle (and the hinge supplemented with copper braid) behind
a clear plastic screen. Unless there are some better suggestions....?
For background information, the PSU consists of 1550 VAC rectified into
nominally 60uF- Appx 2200V, Secondary resistance is 22 Ohms. 20x 1N5408
Bridge and 10x 600uF 300V. Surge limiting resistor is 2x 30 Ohm TV
dropper resistors in series. (this takes 1 kW from the mains for 15
seconds before solder starts melting !!). This limits the short-circuit
current to about 37A.
I have studied all the litrerature available to me, but so far I have
drawn a blank on this.
Thanks & 73 Steve G8IZY.
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