Dry-Type Transformers

DO I HAVE ANY PROBLEMS???

In this application, probably. You have a 3000kVA transformer powering a 1700kVA step down transformer and a 1000kW induction heater, with the 1700kVA step down transformer powering a 2600kW induction heater.

What power factor is the 1000kW and the 2600kW induction heating systems running at (both loaded and unloaded as this effects power factor)? As a rough guide, if the 2600kW induction heater is running at a power factor of more than 0.65 your step-down transformer is overloaded (0.83 for the 1000kW induction heater).

What is the application (metal smelting perhaps)?

there is a problem due to the active power need 2600KW only &the transformer which before the load is 1700KVA , the transformer doesn't sufficient to the load , although the load is unity power factor .

S (appearent power)=P (Active power)/ Power factor

note : S in VA & P in Watt.

It is not possible unless you want to send some smoke signal to your boss, asking for a salary raised.

Basic calculation indicated that, your additional of 2600KW heaters, will be over loading your 1700KVA transformer by 60%. This means that, your 1700KVA transformer will go up in smoke first.

For example, if you don't use it at 100%, let say at 50%, the total loading will be at 1,487 amp or at 83.4%. and the total loading to your main transformer of 3000KVA is 2,816 amp. That means, that you still overloading your main transformer at 2,816 amp or 14.5% over the rated capacity.

So the answer still NO and YES you do have PROBLEMS.

Yes unless you ensure by design that both loads do not engage at the same time. Not enough thermal impedance on a dry transformer, Also pf control recommended