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What is the derating when Prisma system is installed in altitude?
The standard 61439-2 is valid for an altitude up to 2000m. With altitude the atmosphere is modified, cooling efficiency and dielectric properties are impacted.
When installed above 2000m altitude, Prisma P, G and Linergy BS, LGY, LGYE must be derated for the voltage Ui and current.

- The most impact is on voltage (Ui,Ue). As Ui may decrease significantly with the altitude, it must stay valid for the real Ue.
- About the current, the derating should be applied as per the devices altitude derating. (ie: breakers NSX, NW . . .). these deratings are generally given in devices catalogues and may change, depending the ranges.

For Prisma range of products, deratings are:
Altitude0-2000 mup to 3000 mUp to 4000 mUp to 5000 m
Voltages Ui           k=10.880.780.68
Current                  k=As per installed devices altitude derating

More information on the physical phenomena is available in IEC60664 §5.1.2, and “Paschen law” (atmospheric characteristics modified with altitude)

Schneider Electric Казахстан

What is the derating when Prisma system is installed in altitude?
The standard 61439-2 is valid for an altitude up to 2000m. With altitude the atmosphere is modified, cooling efficiency and dielectric properties are impacted.
When installed above 2000m altitude, Prisma P, G and Linergy BS, LGY, LGYE must be derated for the voltage Ui and current.

- The most impact is on voltage (Ui,Ue). As Ui may decrease significantly with the altitude, it must stay valid for the real Ue.
- About the current, the derating should be applied as per the devices altitude derating. (ie: breakers NSX, NW . . .). these deratings are generally given in devices catalogues and may change, depending the ranges.

For Prisma range of products, deratings are:
 
Altitude0-2000 mup to 3000 mUp to 4000 mUp to 5000 m
Voltages Ui           k=10.880.780.68
Current                  k=As per installed devices altitude derating
 
More information on the physical phenomena is available in IEC60664 §5.1.2, and “Paschen law” (atmospheric characteristics modified with altitude)

Schneider Electric Казахстан

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