Transformer winding resistances R1, R2 and Re1 and inductances

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SUMMARY

The discussion centers on the feasibility of determining the primary and secondary winding inductance and resistance (R1, R2, Re1, X1, X2, Xe1) of a single-phase transformer without conducting a short circuit test. Participants agree that while open circuit tests can provide core loss and magnetizing current data, the absence of short circuit test results makes it impossible to accurately derive the necessary impedance parameters. Multiple measurements under different load conditions may offer some insights, but they cannot replace the definitive data obtained from a short circuit test.

PREREQUISITES
  • Understanding of single-phase transformer operation
  • Familiarity with transformer testing methods, specifically open circuit and short circuit tests
  • Knowledge of electrical parameters such as inductance and resistance
  • Basic principles of load testing in electrical systems
NEXT STEPS
  • Research the methodology for conducting short circuit tests on transformers
  • Explore the implications of open circuit tests on transformer efficiency
  • Learn about the relationship between load conditions and transformer performance parameters
  • Investigate advanced techniques for estimating transformer parameters without direct measurements
USEFUL FOR

Electrical engineers, transformer design specialists, and technicians involved in transformer testing and performance analysis will benefit from this discussion.

Physicist3
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Hi,

If there are no resistance and impedance parameters given for a single phase transformer, is it possible to work out the values of primary and secondary winding inductance and resistance (r1,r2,re1, x1,x2,xe1 etc) without the use of a short circuit test. The transformer can be tested open circuit to allow core losses and mag current to be found, but if there is no short circuit test conducted, can these parameters be found? I think it is impossible but i would like clarification
 
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Physicist3 said:
Hi,

If there are no resistance and impedance parameters given for a single phase transformer, is it possible to work out the values of primary and secondary winding inductance and resistance (r1,r2,re1, x1,x2,xe1 etc) without the use of a short circuit test. The transformer can be tested open circuit to allow core losses and mag current to be found, but if there is no short circuit test conducted, can these parameters be found? I think it is impossible but i would like clarification

When you've got a system with several degrees of freedom, it's going to take more than one measurement to determine the defining parameters.

In theory, I suppose you could make measurements with several different loads, none of said loads being a short circuit.
 

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