Augmented Short-Circuit Test for the Measurement of Transformer Equivalent-Circuit Parameters with Large Series Branch Impedances

2010 ◽  
Vol 47 (1) ◽  
pp. 86-93
Author(s):  
Saurabh Kumar Mukerji ◽  
Moleykutty George
Keyword(s):  
Equivalent Circuit ◽  
High Voltage ◽  
Single Phase ◽  
Short Circuit ◽  
Large Series ◽  
Test Results ◽  
Voltage Supply ◽  
Short Circuit Test ◽  
Equivalent Circuit Parameters

An augmented short-circuit test is described for the determination of equivalent-circuit parameters of single-phase transformers with large series-branch impedances. This test may be conducted at rated currents with the transformer connected to a reduced voltage supply. Thus harmonics in current and voltage waves are negligible. This test is therefore free from harmonics-associated errors. Based on test results, phasor equations are found which give formulae for the equivalent-circuit parameters with series-branch impedance split into low- and high-voltage components.

scholarly journals Estimation of Equivalent Circuit Parameters of Single-Phase Transformer by Using Chaotic Optimization Approach

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1697 ◽  
Author(s):  
Martin Ćalasan ◽  
Danilo Mujičić ◽  
Vesna Rubežić ◽  
Milovan Radulović
Keyword(s):  
Parameter Estimation ◽  
Equivalent Circuit ◽  
Single Phase ◽  
Classical Method ◽  
Short Circuit ◽  
Average Error ◽  
Optimization Approach ◽  
Power Load ◽  
Equivalent Circuit Parameters ◽  
Output Characteristics

This paper deals with parameter estimation of single-phase transformer equivalent circuit by using Chaotic Optimization Approach (COA). Unknown transformer equivalent circuit parameters need to be accurately estimated for the best possible matching between the measured and the estimated transformer output characteristics (for example, output power—load resistance characteristic). Unlike literature approaches which apply different estimation techniques and are based either on the nameplate data or the load data obtained from experiments, in this paper the use of COA is evaluated on both types of input data. For two single-phase transformers, different with respect to machine power and voltage levels, the COA-based parameter estimation is compared to various literature techniques as well as to classical method based on open-circuit and short-circuit tests. The results show that COA outperforms other approaches in terms of average error between the measured and the estimated values of the primary current, secondary current and secondary voltage at full load, or between the measured and the estimated output characteristics. The effectiveness of COA is additionally confirmed through its application on laboratory 2kVA, 220 V/110 V, 50 Hz single-phase transformer.

Robustness Evaluation of High-Voltage Press-Pack IGBT Modules in Enhanced Short-Circuit Test

2012 ◽  
Vol 48 (3) ◽  
pp. 1046-1053 ◽  
Author(s):  
Filippo Chimento ◽  
Willy Hermansson ◽  
Tomas Jonsson
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Igbt Modules ◽  
Short Circuit Test
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