Calculate Terminal Voltage with 2 Single Phase Transformers in Parallel

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SUMMARY

The discussion focuses on calculating the terminal voltage of two single-phase transformers, T1 and T2, connected in parallel with specified parameters. T1 has a rated current of 200A, resistance of 0.02 pu, reactance of 0.05 pu, and a no-load EMF of 245V, while T2 has a rated current of 600A, resistance of 0.025 pu, reactance of 0.06 pu, and a no-load EMF of 240V. The load impedance is given as (0.25 + j0.1). The user has successfully calculated the circulating current under no-load conditions but seeks guidance on determining the current contributed by the load impedance.

PREREQUISITES
  • Understanding of single-phase transformer operation
  • Knowledge of per unit (pu) system calculations
  • Familiarity with complex impedance and phasor analysis
  • Experience with parallel circuit analysis
NEXT STEPS
  • Calculate the load current using the given load impedance and the equivalent circuit of the transformers.
  • Learn about the superposition theorem in the context of parallel transformers.
  • Study the effects of transformer impedance on voltage regulation.
  • Explore methods for calculating terminal voltage in parallel transformer configurations.
USEFUL FOR

Electrical engineers, power system analysts, and students studying transformer theory and parallel circuit analysis will benefit from this discussion.

medwatt
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Hello,
Suppose 2 single phase transformers have the following:

T1 T2
Rated Current 200A 600A
Resistance(pu) 0.02 0.025
Reactance(pu) 0.05 0.06
No-Load emf 245V 240V

What is the terminal Voltage when they are connected in parallel and supplied a load impedance of (0.25 + j0.1).

----------------------------------------------
What I've done.
I've calculated the circulating current when there is no load. But I do not know what current will be contributed by the load impedance. What should I do ?
 
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