Tuesday, December 3, 2013

Calculation of the temperature rises in compliance with the Std. IEC 60890

Calculation of the powers generated by the different

components and dissipated inside the assembly

 

The calculation of the power losses reported in the

configurations shown is carried out by taking into account

the effective powers dissipated by the different

components.

 

Circuit-breakers

Given the power losses at the rated current (In) shown in

the following tables and the current which actually flows

through the circuit-breakers (Ib), it is possible to calculate

the effective power losses of the equipment:

 

 

The values thus obtained must be increasde by a factor

depending on the circuit-breaker type.

This coefficient is used to take into account the connections

which carry current to the circuit-breakers

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