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Powering an obstraction light on a distribution structure.

Powering an obstraction light on a distribution structure.

Powering an obstraction light on a distribution structure.

(OP)
What is the simplest (cheapest) way to power an obstruction light on top of a 33-kV distribution structure?  Most of the structures do not have a transformer on them.

Thank You

RE: Powering an obstraction light on a distribution structure.

How much power do you need?

RE: Powering an obstraction light on a distribution structure.

(OP)
It will take 116W.

RE: Powering an obstraction light on a distribution structure.

How about using a VT. It would run you about $1,300/unit or so. Not sure if there are cheaper solutions or not. The Ritz type VEF36-10 can deliver about 1000 VA or so. If you buy in high volume, maybe there would be a price deduct?



RE: Powering an obstraction light on a distribution structure.

With such a small load compared to the thermal-VA rating of a PT there might be some economy in a (local practices permitting) phase-to-ground-powered primary.  In may areas, there are likely requirements for lamp-power reliability whenever a clearance beacon is mandated.  PTs at poletops have been used for low-power SCADA remotes.  Highside overcurrent protection for outdoor PTs is not customary in the US.  

A PV install offhand seems like it could get pricey with a wide-temp battery set, charging control and PV array.  It may be worth soliciting a quote, provided requirements are well understood.  

I know of one attractive neon clearance beacon that is electrostatically powered by 230kV line proximity.  Its cadence is a bit neurotic, so very unavoidable.  I don’t know if it has required significant maintenance over the last ~25 years of operation.  Accessibility looks a bit inconvenient, but it appears the power source has remained the same.
  

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