Hi Bill:
SPDs, regardless of configuration, are notorious for being
prone to failure, either short-circuit or open-circuit or
any value of resistance between those two extremes. (One
cannot predict the energy the SPD will be required to
dissipate.)
From a safety point of view, all such
In message 518feba9.7000...@ieee.org, dated Sun, 12 May 2013, Richard
Nute ri...@ieee.org writes:
As for the requirement for the GDT to pass the hi-pot test...
??? I don't have any rationale for this.
If its seal was broken, letting the magic gas out, would it arc over at
a lower voltage?
On 5/12/2013 12:39 PM, John Woodgate wrote:
In message 518feba9.7000...@ieee.org, dated Sun, 12 May 2013,
Richard Nute ri...@ieee.org writes:
As for the requirement for the GDT to pass the hi-pot test...
??? I don't have any rationale for this.
If its seal was broken, letting the magic gas
Assuming no tracking from impurities, GDT failure mode is typically open.
And personal (anecdotal) experience bears this as correct.
But have seen test reports where simulated lightning strikes with enough
energy cause failure of body such that CTI adversely affected enough to stay
lo-Z.
Brian
John,
It is true that people used to worry about GDTs
venting. In venting the GDT sparkover voltage greatly
increased. In fact, there was a US trend to include a
Back-Up (air) Gap (BUG) across the GDT component in case
this happens. In fact, due to contamination, these BUGs were
more
5 matches
Mail list logo
