Help to get relay for the switching 200kv

[rsiva04]

i need relay which will handle minimum 200kv(DC) 350mA while running

 

[mtwieg]

Uh, there are no relays that will handle that (nothing like a conventional relay, anyways). For reference, this is what switching off 500KVdc looks like: YouTube - Jacob's Ladder: 500kV Switch Opening

Your looking at something extremely expensive, large, and dangerous.

 

[biff44]

They do make relays to do this. They are 20 feet tall, and have pressurerized air to make/break the contact quickly. You need to find a power engineering board and ask there.

 

[uoficowboy]

Highest voltage rating relay I've ever seen was 15KV. Was something like three inches long, as I recall.

What are you doing with 200KV at 350ma?

 

[rsiva04]

tanks..actually i'm working with x-ray generator automation,so i have to switch around 200kv 350mA from x ray machine to load for testing.For that switching purpose only i need relay...one more thing is at the time of switching 200kv is not there in the line after the switching 200kv should pass through that...suggest me...

 

[DXNewcastle]

Have you considered any of the common VCBs (Vacuum Circuit Breaker) ? This is exactly what they are designed to do.
There are several global suppliers of VCBs who offer devices with a wide range of voltages and currents.

If you need an alternative solution, then I'm sure you can buy a used (scrap) VCB or Air-blast CB from some expired power station, engineerng production factory or railway locomotive; they have been very common in industry, and so are now very common in metal scrapyards.

 

[chuckey]

In the UK only the super grid uses this sort of high voltage. Power stations generate at 22KV and step it up to 33/66/132 KV for ordinary grid transmission. The current capacity is of course rather higher then 350mA(50A?). I would get some sketches of a commercial HV switcher and re-design it for your lower currents, because it will make the mechanicals easier to make albeit still of a large size.
Frank