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Ofil’s Daytime Corona Cameras <br />

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Daytime<br /><ul><li> Safety

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Economic

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Routine</li></ul>corona cannot be seen during daytime <br />

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Corona – what is it?<br /><ul><li>We refer to the glow around a conductor or insulator or any high voltage electrical hardware as corona

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Corona is caused by ionization of gas, where electrons that have gained energy from the local e-field revert to their original state and release light/energy mostlyin the UV range

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A critical value of e-field (~24Kv/Cm) is needed to induce the local corona discharge

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Local – it is around its source because the dielectric material does not allow ionization to propagate and the e-field decays rapidly with distance</li></li></ul><li>Corona – why bother?<br /><ul><li>The reliability of high voltage power system is related to corona discharge parameter on a component level</li></ul>Because<br /><ul><li>Corona causes insulation deterioration and to components degradation and to audio noise and radio interference

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All power system components should be tested to verify that this parameter is controlled</li></li></ul><li>Corona triggers degradation due to<br />Ultra Violet Radiation. Polymer material is susceptible to degradation due to UV more than to solar radiation<br />Ozone (O3) – Ozone is a byproduct of corona discharge. Ozone attacks materials such rubber, gaskets and seals<br />Acids – both organic (oxalic) and inorganic (nitric)Moisture in combination with contamination and corona create acid. Acid on polymers are active degradation factors<br />Mechanical attack– repeated corona bombardment drills holes in the polymeric substance. <br />

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Corona camera for daytime <br />Principle:<br />Bi-Spectral UV-Visible<br />Input: UV radiation – unseen by human eye + Visible view of the background <br />Output Visible representation of the unseen UV overlaid on the background <br />

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The spectrum: UVc is in the solar blind<br />UV<br />IR<br />120<br />C<br />B<br />A<br />10<br />100<br />8<br />80<br />Solar Radiation (µW/cm2/nm )<br />6<br /> Filter Transmission (%)<br /> 60<br />4<br />40<br />2<br /> 20<br />200<br />300<br />400<br />500<br />600<br />700<br />800<br />900<br />1000<br />Wave length (nm)<br />visible range<br />corona<br />

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Bi Spectral imaging<br />250 kV<br />Combined mode<br />Visible mode<br />UV mode<br />

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Examples - Transmission<br />Transmission - BN<br />

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Examples - distribution<br />Pinpoint corona sources<br />13.4kV<br />

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Examples - substation<br />

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Examples - switchgear<br />

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Examples - motors<br />

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BenefitsofOfil’sCoronaCameras<br />Non-destructive (NDT) Corona Cameras allows you to:<br /><ul><li>Make daytime Inspection

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Remote sensing

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Detect Corona and UV events

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Locate and pinpoint Corona

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Measure UV events

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Record each corona source

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Create a PdM for Cost Effective purposes</li></li></ul><li>Platforms<br /><ul><li>Aerial

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Hand held for on foot patrol

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Vehicle mounted

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Compact handy hand held</li></li></ul><li>Range of products<br />DayCor ®family<br /><ul><li>Sueprb

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Ranger

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Rail

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Rom

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ROMpact</li></ul>UVolle<br /><ul><li>UVolle-Vi

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UVolle-S</li></ul>CITI – Corona Inspection Training Institutewww.citi-training.com<br />

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www.ofilsystems.com<br />Thanks.<br />