Does the Silicon Oxide Varistor (SOV) live up to its claims?

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dancasey
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Joined: 8 Oct 2012 - 23:32
Does the Silicon Oxide Varistor (SOV) live up to its claims?

I would welcome feedback on the following product as to its practical use as a type 1 or 2 SPD. There seems to be little or no information available on this product or technology other than the manufacturer website. I am seeing positive reviews from those who have installed this product esp.from installers of solar / microgrid systems for residences. Has there been any evaluation or testing by the IEEE community? I am also interested in mitigating any grid-propagated EMP disturbances that might occur at the service entrance to my residence. Would this SOV be a good choice for that? Please see the following link which describes this device: http://www.deltala.com/info-why-delta.php 

Edited by: admin on 12 Jan 2017 - 09:53
admin
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Joined: 6 Jan 2011 - 19:02
Patent search results

According to a patent search, the Delta company owner, Mike Craddock has US and CA patent grants dated 1973. The abstract of US 3764854 A reads:

An excessive voltage arrestor is disclosed which has four conductors for connection to three-phase power lines and ground. Three conductors are disposed in a silicon oxide filler at equal distances from each other, with the neutral ground conductor centrally positioned to form a Y configuration. The silicon oxide filler is nonconductive at normal voltages and highly conductive after ionization at normal voltages and highly conductive after ionization by excessive voltages. A nonconductive casing forms an electrically insulated compartment containing the conductors and filler.

In the body text the filling is further described as "Granulated silicon oxide material, such as a mixture of granulated quartz and silica".

There are not any performance curves in the patent and the operating explanation I find strange.

steven.p.hensley
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Joined: 8 Oct 2012 - 23:32
Registration Question

The specification document shows a Intertek ETL label and certification to CAN/CSA Std. C22.2 No. 8. I can not find any current document by that number.