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Registered Member #62084
Joined: Wed Jan 10 2018, 09:04AM
Location: Midlands UK
Posts: 12
How can I set my safety Terry filter spark gap to fire just over the NST output when the mains voltage, here in the UK, can vary +10% to -6% from nominal?
Same problem applies to main spark gap setting too to fire at NST volts if volts can vary so much from nominal.
Registered Member #62109
Joined: Sun Jan 28 2018, 10:00PM
Location: Porto Alegre
Posts: 56
Well others may have already gone thru this. But I GUESS, it is not that critical. I think air humidity has a lot more influence than something around 1kv or a bit more on the output. As I said, I think... Not sure. But I can't get a spark from a 2kv MOT with a spark gap like 0.2mm. Just remember to turn everything off when adjusting things. And capacitores must be always discharged.
Registered Member #62084
Joined: Wed Jan 10 2018, 09:04AM
Location: Midlands UK
Posts: 12
Thanks for that........ I am very careful with HV stuff. 3 strings of bleeders across caps. Also use a bang stick and shorting out leads and handle with ONE hand only as well.
Caps can bite later as do HV cables, after discharging when stresses are relieved so I never trust them.
In the last day my mains volts have shown a 5 % variation. At 15,000 v from the NST that represents a 750v swing . Probably will be over 1,000 volts soon so I guess my best bet is to set all the safety/main gaps when the mains it at max to be on the safe side.
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Mains variation
