To: | <[email protected]> |
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Subject: | LF: Re: Corona Discharge - how to prevent ? |
From: | "Alan Melia" <[email protected]> |
Date: | Wed, 2 Mar 2011 21:11:39 -0000 |
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The standard technique is a "corona ring"....so you avoid any sharp points on the high voltage end of the wire and increase the radius....you remember the brass balls on the end of Wilmshurst Machines :-)) All you need is a 4 to 6 inch circular loop of copper wire (stiff so self supporting) at the insulator. Another piece across the diameter for mounting and connecting to the end of the wire. The loop becomes the "end of the wire". I have a feeling Jim wrote this up somewhere. Steve GW4ALG burst he support balloons with the corona before he terminated the wire in a loop. It is a significant loss of power at high power levels. Alan G3NYK ----- Original Message ----- From: "Graham" <[email protected]> To: <[email protected]> Sent: Wednesday, March 02, 2011 8:32 PM Subject: LF: Corona Discharge - how to prevent ? Corona Discharge - how to prevent ? Running into corona problems with a small loaded antenna , terminating as a wire at the far end Q has any one addressed this problem and found a suitable solution ? Apparently more prevalent on 136 khz , this is presenting on 500k , I can find reference to rounded objects and rings , one being two sets of ring's the second being insulated to reduce the v/mm stress , but these where part of a high voltage insulator with the far end earthed , not so in this case, the wire ends in free space .. Increasing the surface area will distribute the charge , but will not reduce the stress as this is a generated field as opposed to a static build up ? Links / ides ? Tnx - Graham . |
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