How Do You Calculate Transformer Losses and Resistances from Test Data?

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SUMMARY

The discussion focuses on calculating transformer losses and resistances using test data from a single-phase transformer. The transformer specifications include a 2200/220 V, 500kVA, 50Hz distribution transformer, with open circuit test data showing V(l)= 220V, I(l)= 85A, P(oc)= 1800W, and short circuit test data indicating V(h)=95V, I(h)=227.3A, P(sc)= 8.2kW. Key calculations involve determining equivalent resistance on the low voltage side, copper losses during the open circuit test, and core losses when rated voltage is applied. The discussion emphasizes that core loss can be treated as a constant, while copper losses vary with load.

PREREQUISITES
  • Understanding of transformer testing methods, specifically open circuit and short circuit tests.
  • Knowledge of electrical parameters such as voltage, current, and power in transformer operations.
  • Familiarity with calculating equivalent resistance in electrical circuits.
  • Basic principles of core loss and copper loss in transformers.
NEXT STEPS
  • Study the calculation of equivalent resistance in transformers using test data.
  • Learn about transformer copper loss and its dependence on load conditions.
  • Research the significance of core loss in transformer efficiency and performance.
  • Explore advanced transformer testing techniques and their applications in diagnostics.
USEFUL FOR

Electrical engineers, students in power systems, and professionals involved in transformer design and testing will benefit from this discussion.

alnywk
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urgent : single phase transformer

Homework Statement



A 2200/220 V, 500kVA, 50Hz distribytion transformer has been tested by means of the open circuit. the test data obtained is as follow:
open circuit test: V(l)= 220V, I(l)= 85A, P(oc)= 1800W
short circuit test V(h)=95V, I(h)=227.3A P(sc)= 8.2kW



2. Relevant question

1.equivalent resistance referred to the low voltage side (state all assumption)

2. resistance of the low side winding only

3.transformer copper loss of the secondary winding during the open circuit test

4. transformer core loss when rated voltage is applied

5. explain if it justified to use the power input during the open circuit test as core loss?






The Attempt at a Solution

 
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It is so clear that you want us to do your homework. Here is a hint. OC tests are used to find parameters on the primary side, and SC tests are for the secondary side. Once you find out your core loss, you can assume it to be a constant and not varying with load. Only the Cu losses will change with load.
 

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