Powering an obstraction light on a distribution structure. 1

[woodye]

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

 

[scottf]

How much power do you need?

 

[woodye]

It will take 116W.

 

[gordonl]

I've seen solar units used on buoys, I'm sure there are folks selling the entire assembly as a unit.

Quick search:

http://www.gsilight.com/gsipml01.htm

http://www.southernseasmarine.com/items_solar.htm

 

[scottf]

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?

 

[busbar]

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.