Switchyard lighting

[AusLee]

Hello,

I have some questions about outdoor switchyard lighting:

1. Why is HPS usually used instead of Metal Halide? HPS have a lower colour rendering index, and in a switchyard with 20 fittings max, the cost difference is negligible.
2. Why are the lighting requirements in the middle of nothing: almost 50 lux/5fc max. This is too good for walking (relatively) and too little for reading/maintenance (minimum visual task requires 160 lux/ 16 fc).
3. Due to clearances from HV lines and to simplify earthing studies, the preferred method of installation is to put the projectors on the steel structures of the HV lines instead of adding dedicated steel lighting columns. If a lamp fails, how do you go about changing it? cherry picker and up to the lamp as long as you're still clear from the installation?

If there is a standard / document / guideline that has this info much appreciated if you can provide a link.

Cheers.

 

[itsmoked]

I agree with your HPS verse MH assertion. I consider LPS to be,,, for lack of a better term - repugnant.

HPS lamps run about 20% longer than MH lamps and often cost a few dollars less. Cutting to the chase, it's the bean counters who are selecting them.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Massoud1]

Projectors normally are installed on gantry coulmns not on gantry poles so one could change a lamp in an energized substation safely.

 

[AusLee]

Thanks itsmoked, so that's on point down.

Massoud1 can you please provide more details?

 

[Massoud1]

Sure, each gantry comprises two columns and one pole.
Since string insulators and live parts terminate to the pole, one (who has to be familiar with the hazardous area) can go up the column an change the lamp.

 

[PHovnanian]

Sure, each gantry comprises two columns and one pole.

Alternate nomenclature: pole == beam (the horizontal part of the structure).