Ecodial transformer secondary connection

[KrunoslavSever]

Hello,

I have a customer with existing installation of two switchboards directly connected to secondary of trihal transfomer. Network with one connected switchboard you can find in attachment - drafted by the customer. So, overall network consist of two 630 amp switchboards directly connected to secondary of trihal via 4*150 mm2 aluminum cables. Is this configuration possible to design in ecodial?

Thank you,

Best regards,

K

[Manon_Chaboud]

Hello @KrunoslavSever, thank you for your post!

@Saravanakumar.L, can you please advise @KrunoslavSever? Thank you in advance 🙂

[Darini · Accepted solution]

Hello K,

Ecodial typically models a single main outgoing feeder from a transformer. Directly connecting two main switchboards from the same transformer secondary is not a standard modeling approach in Ecodial, and it doesn’t natively support multiple direct connections from a single transformer output.

   Workaround in Ecodial:

You can model this setup by:

  Creating a main LV switchboard (e.g., MSB) connected to the transformer.

  Then, from the MSB, you can draw two outgoing feeders (each with their own protection) going to SB1 and SB2.

  •  This may not reflect the exact physical layout, but it helps in performing load flow, short-circuit, and protection coordination calculations accurately.

Thank you for sharing the .eac file and the installation details.
Key Issues Identified in project:
1. Voltage Drop Exceeded:
• The error message for WD0 “The cable is not compatible . The voltage drop exceeds the permissible maximum” indicates that the 4×150 mm² Al cable over 145 m results in a voltage drop that exceeds the recommended 3% limit for feeder circuits as per IEC 60364-5-52, which may affect performance, especially for voltage-sensitive equipment.

2. Circuit Breaker Sizing – MTZ06H1:

• The current CB is shown as undersized in Ecodial.
• Upon unlocking the settings, Ecodial recommends upgrading the cable to 3×300 mm² Al (+PEN) and using a NS1600 circuit breaker instead of the current MTZ06H1.
• This ensures both thermal compatibility and acceptable voltage drop across the feeder.
⸻
Recommended Actions:
1. Upgrade Cable Sizing:
• For each 630 A feeder, use either:
• One run of 4×240 mm² Al cable, or
• Two parallel runs of 4×150 mm² Al cable.
• For the source feeder, consider upgrading to 3×300 mm² Al + PEN cable as suggested.
2. Upgrade Circuit Breaker:
• Replace MTZ06H1 with NS1600, or another appropriate breaker, as per the cable capacity and expected load.
3. Compliance Confirmation:
• These updates will ensure compliance with voltage drop limits and thermal sizing in Ecodial and align with IEC standards for LV design.

Please let me know if you need further assistance.

Regards, 

Darini H.D

CPS expert support