Hi Dudley
From reading the article I’d say the paint has sufficient insulating properties to prevent flashover, and maybe to reduce any induction effect into the steelwork of the bridge from the high voltage AC. They are vague about whether it is a simple insulator or does more than that, which might be why it’s “special”.
It also looks like the line voltage is reduced under the bridge to allow closer clearance between train roofs and the overhead. 70mm is a big reduction in electrical air gap when high voltages are involved.
Tony
> On 24 Feb 2021, at 9:55 pm, Anthony Dudley Horscroft transitconsult@...> wrote:
>
> I refer to the lead article on "Electric resistant paint". Given that the electrification is new main line stuff, I presume that it is 25kV AC. Perhaps those familiar with electricity and trackwork can comment on its use to insulate rails and Pandrol or other fittings where the PD should not be more that a couple of volts?
>
> Regards
>
> Dudley Horscroft
>
>
>
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