Projects:2014S1-29 Measurement and Estimation of Transformer Parameters
Contents
Project Information
The aim of this project is to rigorously combine measurements of practical transformers, with standard transformer-models, using the method of least squares and optimisation techniques, to obtain best estimates of transformer-model parameters. Transformers are the most important building-block of power transmission systems. They are used to transform the magnitudes of voltages and currents. They are used to match sources to loads, to reduce losses, and to improve efficiency. They isolate consumers from dangerous voltages in the transmission network. One of the main problems with modelling transformers is that the fields are distributed in space, which means that lumped models will always be approximate. Also, most practical transformers are significantly non-linear due to saturation of magnetic materials. Transformer models are always provisional, and only apply within certain ranges of current, and frequency. The practical goal of a modeller is to match a chosen equivalent-circuit, to a given device in such a way as to minimise any discrepancy between the observed behaviour of the device and the predicted behaviour of the model.
Outline of Main Tasks
- Task 1: Literature search on transformer models and measurement techniques
- Task 2: Identification of a suitable physical transformer for initial study
- Task 3: Open-circuit tests of the transformer using inductor models
- Task 4: Open-Circuit and Short-circuit tests of the transformer, using inductor, and coupled-magnetic-circuit models.
- Task 5: Full-analysis of the transformer, under many (at least seven...) loading conditions, and full estimates of all parameters.
High Level Design
- Stage 1:
- Basic equipment setup(transformer, current sensor)
- Stage 2:
- SC & OC tests based on the transformer module, transformer parameter estimation
- Stage 3:
- 7 different loading conditions, power source under different frequencies conditions.
Supervisors
- Dr Andrew Allison
- Dr Rastko Zivanovic
Workplace
- Bench 6 in Project Lab
