Problem with KTC-2500 Busbar rating

[Moe]

at ambient temp 55C KTC-2500 busbar rating is  shown as Iz=2500A;

at ambient temp 40C KTC-2500 busbar rating is shown as Iz=2105A

[Genghiz]

Hello

The Ecodial INT version is verified for the reported situation.

The application is working as expected.

Iz for 45 * temperature

 For the change in temperature, the derating of the busway is considered. 

Iz for 55* temperature

If you have any comments on the above, kindly please come back for a discussion.

Regards,

Team - Ecodial Expert Support.

[Moe]

I tried the same software version 5.2.0 INT and the results appear to be different from yours.

[Genghiz]

Hello Moe,

Kindly please share with us the project file, that you have created.

The said, scenario is not reproduced from our end.

-Team Ecodial Expert Support.

[Moe]

Attached below

[Saravanakumar.L]

Hello Moe,

It appears that Ecodial is functioning as expected.

considering the real load of approximately 2000A. We've installed Busways with a KTC 2500 rating to accommodate the 2000A load, accounting for losses due to temperature.

For example:

Case 1: If the temperature is set at 55°C, the Busways need to compensate for the 2000A load and losses due to temperature. With a rated load current of 2000A and losses of 500A, the Busways need to carry 2500A to supply the 2000A load.

Case 2: If the temperature is set at 45°C, the Busways need to compensate for the 2000A load and losses due to temperature. With a rated load current of 2000A and losses of 222A, the Busways need to carry 2222A to supply the 2000A load.

Case 3: If the temperature is set at 30°C (idle temp), the Busways need to compensate for the 2000A load and losses due to temperature. With a rated load current of 2000A and no losses (0A), the Busways need to carry 2000A only to supply the 2000A load. Losses are nil due to idle temp.

It's important to note that the losses will not decrease further with temperatures like 25°C or 20°C.

In this situation Ecodial could adopt KTC-2000A as same as rated load current 2000A(Nil loss).

Hope this may resolved your query. 

Thanks & Regards,

Team- Ecodial Expert support. 

[Moe]

As per your explanation above, I understand that you are defining Iz as the required rated current carrying capacity of BTS required for my application. However, Iz shall be the calculated actual current carrying capacity of the selected BTS under service conditions.(same as Ecodial do for cables).

[Saravanakumar.L · Accepted solution]

Hello Moe,

Thank you for your response. I appreciate your understanding.

To clarify, yes, the defined Iz represents the current carrying capacity of the BTS & Cables under real condition in our application.

However, Iz reflects the calculated real time current carrying capacity of the selected BTS under service conditions, like how Ecodial handles cables.

Please find the below image to find the standard maximum current carrying capacity of adopted cables (Iz’) and Current carrying capacity at real conditions (Iz) (Installation method and temperature) mentioned in details column.

So, both the adopted BTS & Cables have standard current carrying capacity/Rating and real time current carrying capacity. 

Hope this resolved your query.

Thanks & Regards, 

Team- Ecodial Expert Support. 

[Moe]

if you agree with me that Iz is the current carrying capacity at real conditions, which is absolutely true, how come Iz for KTC2500 to be equal to 2500A at 55C and Iz for KTC2500 be equal to  2222A at 45C.

Logically, for the same product (KTC2500)  Iz must be lower at higher ambient temperature.

[Saravanakumar.L]

Hello Moe,

I trust this message finds you well. As we are aware, Iz represents the current carrying capacity under real conditions. Allow me to illustrate this with a couple of examples:

Example 1:

• KTC2500 – Rated at 2500A
• At 55°C, the network/Feeder utilizes current carrying of Iz would be 2500A under real condition.
• This entails an actual load of 2000A and losses amounting to 500A due to the temperature.
• Therefore, the cumulative current carrying capacity of KTC2500 is 2500A.
• Iz = 2500A = 2000A (Rated load current) + 500A (losses due to 55°C temperature).
• Higher the temperature higher the losses. 

Example 2:

• KTC2500 – Rated at 2500A
• At 45°C, the network/Feeder utilizes current carrying of Iz would be 2222A under real condition.
• This involves an actual load of 2000A and losses amounting to 222A due to the temperature.
• Hence, the cumulative current carrying capacity of KTC2500 is 2222A.
• Iz = 2222A = 2000A (Rated load current) + 222A (losses due to 45°C temperature).
• Lower the temperature lower the losses. 

Logically, Ecodial, being the design software, should calculate based on our inputs and adapt the suitable (Upgradation & Degradation) rated equipment.

In your perspective, yes. indeed, Iz is lower at higher ambient temperatures, such as 55°C, and we should not exceed a load of 2000A.

However, at a temperature of 45°C, it is feasible to load above 2000A, up to ≈2250A.

Iz is higher at lower ambient temperatures at 45°C. 

I trust this clarifies your query. If not, we kindly request a meeting to explore the Iz calculation and equipment ratings further. Your insights on this topic would be invaluable for our team.

Could you please confirm your availability and share your contact details so that we can schedule a meeting via Teams at your convenience?

Your input and expertise will be pivotal in fostering a better understanding of these critical aspects, benefiting us mutually.

Looking forward to your response.

Thanks & Regards,

Team- Ecodial expert support