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Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
Hi I am trying to create a switch box to switch to incoming signals, one an HV signal that can range from 450Vac - 9kVac 70 to 300Watts (390khz to 470khz , sometimes modulated with a repetition frequency of 27khz). The other signal is a 20khz 400Vac 1 to 100mA variable input. My initial goal was to create a sensor to detect the HV signal and disconnect the other signal from the output to keep it safe, but this is proving very difficult as it would still require a powerful make/break 9kV relay which runs into hundreds of dollars.
Does anyone have any good ideas on other methods to accomplish this besides expensive vacuum relays?
Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
Yeah I saw that page, I was still concerned about the manufacturer price quote being very high, especially if I build a few of these things it will be difficult to get the same used components.
I had actually solved that problem by using two relays, such that when HV was detected, the LV relay would break (open) and the HV would make (close) allowing it to flow to the output. But like I said, these relays just seem too expensive. I wish there was someway to have both signals connected , and that whenever the HV signal was applied, the LV would be filtered out. blah im dreaming probably
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Sounds like the 20 kHz signal @400 Vac is a tester of some sort. (insulation?)
You could just build a gas tube snubber to protect the 20 kHz source from getting zapped and feed the 20 kHz through inductances that will form a low pass filter to the 390-450 kHz yet allow the 20 kHz to pass up to 100 mA. the two signals are about 4 octaves apart. what is the impedance of the system?
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Ideas for high voltage switching
