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Old 9th April 2008, 12:50 PM   #1
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Join Date: Jun 2006
Location: West Oxon
Default Gas discharge tubes in transient overvoltage suppression

Hi, anybody have any experience using these in AC power lines?

In particular, how I translate the commonly given figures for DC firing voltage and DC holdover voltage into AC applications? Don't want to asume a linear relationship, but do want to specify as close to maximum AC operating voltages (UK 250VAC +/- 10V max) as possible.

As usual manufacturers are ignoring comms....

Also - where best to place them? Shorting to earth from L + N, or across L + N, or both?

Thanks, Sod.
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Old 14th April 2008, 12:43 AM   #2
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Join Date: Sep 2006
You want to put them between any line that is not tied to ground and ground. Here in Canada neutral is tied to ground in the breaker box so putting a discharge tube between neutral and ground is pointless.

I have seen then put between hot and neutral since neutral is the same thing as ground anyway. I prefer using ground though, it seams simpler to me since in some places neutral is not tied to ground.

The tube should not trigger at a premature voltage until you get into really high frequencys. I would guess well into the Khz range. You must take into account that 250vac has a peak of 353.5 volts (Vpeak=Vrms*1.414).
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Old 15th April 2008, 09:44 AM   #3
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Thanks for that
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