Same load with different breaker sizing result

[CVSD]

Hi,

I am new with Ecodial and I found that this software is useful.

I am playing with the software to see breaker sizing result and I am surprise that the result is difference even with same load. Please guide me to get this? Please see red arrow attached.

[Genghiz]

Hello Ma'mun,

Thanks for reaching the forum “EcoStruxure Power Design.”

Our comments : 

For the network, that you have given…

Can you please check the “Ib” used for sizing the circuit breaker? This can be verified as shown below (select the device and check the properties).

Checking the Ib (A)

This design current (Ib) will have an important impact on the sizing of ‘the protection device.’

In this situation, both the circuit breaker may have a different design current (Ib).

Feel free to comeback, if the provided explanation does not answer your query.

If any further analysis is required, then please provide the project file (.eac) created from EcoStruxure Power Design-Ecodial.

Thanks & regards,

Team – Ecodial Expert Support.

[CVSD]

Hello @Genghiz,

Both Ib generate different values (20.6 A and 19.9 A). What reason behind this?

Please see the files attached.

[Genghiz · Accepted solution]

Hello Ma'mun,

Thanks for your reply and for the given project file (.eac)

Our comments:

At the given project file there are many ‘1P+N’ load, and they are connected (Or) forced to a specific (Lx + N) line to neutral connection.

Suggestion:

If we make a ‘Auto’ choice for connecting these loads, then the application manages the ‘automatic load balancing’ as shown here.

Auto - Selection to distribute the loads

Result : 

The outcome of this automatic load balancing, has lead to the same current at both the 'circuit breakers' (QA23 & QA35) as shown below. This has also brought same results/products as well. 

Same Sizing Current (IB) and Same Solution

Thanks & regards,

Team – Ecodial Expert Support.