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Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Tony Matt:
The insulation between the plates, wires, electrodes and conductors shall be such that prevents the corona.
For insulation compound of a solid insulation and thin layer of air, the corona starting voltage is related to the thickness of the air layer, the dielectric constant of air, the thichness of the solid insulation and the dielectric constant of the solid insulation. I am estimating the corona starting voltage using the AIEE publication done in April 1956. (now IEEE). Attached is a graphic that I use to estimate the corona starting voltage when the sparation of the electrodes is a layer of air and a solid insulation.
If the separation between the energized parts is just air, I consider 1mm of air for each 3900Vpeak
If the separation between the energized parts is a SURFACE of an insulation (creepage) I consider 1mm of air for each 800Vpeak.
In addition, a safety factor of 1.4 to 2.0 is recomendable.
This criteria I have used to make my capacitors and HV pulse tranformers.
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Tony Matt:
Despite I have used that publication to design insulation of HV transformers, capacitors, and even HV apparatus for long time, I do not have this publication anymore.
The complete publication is very good. you may get a copy in a public library, university library or even from some old AIEE member.
Now the paper "Calculation of Corona-Starting Voltage in Air-Solid Dielectric Systems" is published by the IEEE under the
ISSN: 0018-9510 Digital Object Identifier: 10.1109/AIEEPAS.1956.4499294 Date of Current Version: 07 May 2008
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Hi Tony;
Here a site that shows how to calculateted the creepage insulation in HV transformers. The same calculation to be used in design of margins of capacitors dielectric.
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HV CAPACITOR dV/dt CAPABILITY estimation (or design)
