High Voltage Relays
High Voltage Relays
(OP)
I have attached a picture of a circuit where a hi-pot is applying 4800VAC to a transformer. Also in parallel with that 4800VAC rms are two wires heading into a 600VAC rms multiplexer. I have one relay on each line. The 4800VAC is only applied when the relays are both open. I am not sure of the type of relay that I should get. I am thinking that it should be able to withstand at least 4800VAC rms while open, and then operating voltage should be at least 600VAC (since that is max capability of the multiplexer). Is this thinking correct or can I use a relay with a smaller voltage rating? All help is appreciated.
Thanks
Thanks
RE: High Voltage Relays
Are you kidding?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: High Voltage Relays
RE: High Voltage Relays
What kind of circuit is this?
Are you asking about what type of switching device to use to ensure that the 4.8 kV potential is never applied to the 600VAC multiplexer? If in fact that is your question, it is your use of the word "relay" that is throwing us off.
I don't profess to have a great deal of the type of experience applicable to your question, but I have only ever seen that high a potential switched using either a circuit breaker or fuse-equipped cut-out switch. As near as I can tell, what you'd want to have is a ganged disconnect switch interposed between the transformer winding to be hi-potted and the multiplexer, the operating mechanism of which incorporates a 'b'-type position or limit switch wired in such a way that the 4.8 kV supply cannot be applied to the unit under test unless the interposing switch contacts are open.
Hope this helps.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: High Voltage Relays
Gigavac have some multi-pole HV relays which look like a plausible solution to integrate all four switching devices in one package.
RE: High Voltage Relays
That is definitely too much - in several senses.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: High Voltage Relays
Z
RE: High Voltage Relays
Bill
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"Why not the best?"
Jimmy Carter
RE: High Voltage Relays
Untrue. You want a relay that is designed for 4.8kV service voltage. A hipot test is a one-off or very infrequent withstand test, not a routine operating condition. You're using the component at 4.8kV in a routine operating state. A 600V relay will not have adequate clearance or creepage distances for service at 4.8kV.
RE: High Voltage Relays
ScottyUK, these Gigavac devices look great. Thanks!