Transformer winding resistances R1, R2 and Re1 and inductances

In summary: But, practically speaking, this is not a viable solution.In summary, without conducting a short circuit test, it is impossible to accurately determine the resistance and impedance parameters of a single phase transformer. While it is theoretically possible to make multiple measurements with different loads, this is not a practical solution.
  • #1
Physicist3
104
0
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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  • #2
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.
 

Related to Transformer winding resistances R1, R2 and Re1 and inductances

What are transformer winding resistances R1, R2 and Re1?

Transformer winding resistances R1, R2 and Re1 refer to the resistance values of the primary (R1), secondary (R2), and equivalent (Re1) windings in a transformer. These values are important to consider in transformer design and operation, as they affect the efficiency and performance of the transformer.

Why are these resistance values important?

The resistance values of transformer windings are important because they directly affect the amount of power loss in the transformer. Higher resistance values result in higher power losses, which can decrease the efficiency of the transformer. These values also affect the voltage regulation and temperature rise of the transformer.

How are these resistance values determined?

The resistance values of the transformer windings are determined by the material used for the windings, the length and cross-sectional area of the wire, and the number of turns in the winding. These values can also be affected by temperature and frequency.

What about inductances in a transformer?

In addition to resistance values, transformers also have inductances associated with their windings. These inductances, labeled L1, L2, and Le1, represent the ability of the windings to store energy and can affect the performance of the transformer. Inductance values are determined by the number of turns in the winding and the magnetic permeability of the core material.

Why is it important to consider both resistances and inductances in transformer design?

Both resistance and inductance values must be considered in transformer design because they work together to determine the efficiency and performance of the transformer. While resistances affect power loss and voltage regulation, inductances affect the magnetizing current and transformer impedance. Balancing these values is crucial for optimal transformer operation.

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