cupoftea
Advanced Member level 6
Hi,
The following Agriculture unit has loads of LED lights to
help the crops grow....
www.intelligentgrowthsolutions.com
They feed the LED drivers from the output of multiple 6 pulse three phase
diode rectifiers. -With only low capacitance at the rectifier outputs. (its easy to have low capacitance at output of 6 pulse rect and still hold the voltage up well).
So...3 phase Mains comes in to the installation, then a 3 phase transformer steps it
down to , I think, some 50Vrms in each phase_to_neutral....then a frame/network of bare alu bus bars ports this
"low voltage" AC bus around, and then the LED drivers (with their 6 diode rectifiers at their front end) connect to the bus bar with simple screw on "pegs" with flying wire
to the LED driver.
The thing is, we need to know what is the "low voltage" AC distribution bus voltage?
We wrote to them but as yet no answer. Do you know what it is likely to be?
Obviously it will be as high as possible allowed by the SELV regulations.
But what may we ask is that?
It (the bus bar network) obviously needs to be touchable as staff will have to "Peg" LED drivers to it.
How would they allow it to be touchable during a mains transient?, which would be passed through the mains transformer.
The power bus is explained in here...
www.ingenia.org.uk
The following Agriculture unit has loads of LED lights to
help the crops grow....
Intelligent Growth Solutions | Global Vertical Farming Technology
Intelligent Growth Solutions is a global vertical farming technology company, growing premium plants with precision in our vertical Growth Towers.
www.intelligentgrowthsolutions.com
They feed the LED drivers from the output of multiple 6 pulse three phase
diode rectifiers. -With only low capacitance at the rectifier outputs. (its easy to have low capacitance at output of 6 pulse rect and still hold the voltage up well).
So...3 phase Mains comes in to the installation, then a 3 phase transformer steps it
down to , I think, some 50Vrms in each phase_to_neutral....then a frame/network of bare alu bus bars ports this
"low voltage" AC bus around, and then the LED drivers (with their 6 diode rectifiers at their front end) connect to the bus bar with simple screw on "pegs" with flying wire
to the LED driver.
The thing is, we need to know what is the "low voltage" AC distribution bus voltage?
We wrote to them but as yet no answer. Do you know what it is likely to be?
Obviously it will be as high as possible allowed by the SELV regulations.
But what may we ask is that?
It (the bus bar network) obviously needs to be touchable as staff will have to "Peg" LED drivers to it.
How would they allow it to be touchable during a mains transient?, which would be passed through the mains transformer.
The power bus is explained in here...
Vertical farming for future growth | Ingenia
Ingenia focuses on all aspects of engineering. Our articles showcase a wide range of engineering and technology innovation, from robotics and data to the latest in renewable energy and medical technologies.
www.ingenia.org.uk
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