Streetlighting - 12/25/05 08:11 AM
I'm curious to know what controlsystems for streetlighting are in place in other countries and how well the schematics are kept up to date or not.
Ok this is around the greater Auckland area , New Zealand.
In West and North Auckland a pilot system is used via the tail and charley principle.
Via substation lightcell through section switches usually 6 ( 4core )pilot circuits are following the main outgoing 11000 Volts feeders to the first contactor on pole, transformer or plynth, then 20 or so SL's then next contactor and so on. the H/W ccts following the same principle.
An option to dump SL load from the sub is possible but I have never seen it happen.
Zellweger control in rural areas is the second option instead of pilots to save in extra pilot wires.
Where matters have turned to custard in areas where widening of the roads have caused pilot cables to be damaged or simply cut underneath the road, local lightcells are used or timeclocks for the control if repair and roadworks become to major to re instate the SL pilots.
The pilot system is also used for hotwater cylinders over the peak demand period.
Schematics are in general non existent especially in new subdivisions where the cheapest option was favoured and within weeks the problems start showing up when matters don't work as supposed too.
Are the systems metered or on a so many hours a year basis. The main motorways, Transit lights are metered as where the suburban SL's not.
Ok this is around the greater Auckland area , New Zealand.
In West and North Auckland a pilot system is used via the tail and charley principle.
Via substation lightcell through section switches usually 6 ( 4core )pilot circuits are following the main outgoing 11000 Volts feeders to the first contactor on pole, transformer or plynth, then 20 or so SL's then next contactor and so on. the H/W ccts following the same principle.
An option to dump SL load from the sub is possible but I have never seen it happen.
Zellweger control in rural areas is the second option instead of pilots to save in extra pilot wires.
Where matters have turned to custard in areas where widening of the roads have caused pilot cables to be damaged or simply cut underneath the road, local lightcells are used or timeclocks for the control if repair and roadworks become to major to re instate the SL pilots.
The pilot system is also used for hotwater cylinders over the peak demand period.
Schematics are in general non existent especially in new subdivisions where the cheapest option was favoured and within weeks the problems start showing up when matters don't work as supposed too.
Are the systems metered or on a so many hours a year basis. The main motorways, Transit lights are metered as where the suburban SL's not.