Design of a Self Regulated and Protected Electrification Transformer
Date
2007-03
Authors
Beckers, Peter C.
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
Electrification of rural areas is one of the biggest challenges faced by ESKOM and
methods are required to extend medium voltage distribution lines to these often
remote areas. As loads increase due to line-extension, in-fills and energy theft,
maintenance cost and life expectancy of distribution and power transformers
becomes more critical. The thesis addresses these two aspects with the
development of a self regulated and protected electrification transformer that
makes use of current, voltage and ambient temperature measurements to
regulate voltage and protect hardware from overloading. The design of the
hardware that allows the system to run at 200% load without decreasing the
lifetime of the transformer is examined. Temperature estimation techniques are
used to estimate the temperatures in the 16 kVA, 22 kV to 230 V, distribution
transformer to run above nameplate ratings without causing damage. The control
of the system is implemented on TMS320F2812 digital signal processor from TI
that is DSP/BIOS compatible. The control software is implemented using
DSP/BIOS, which allows real-time scheduling and monitoring of procedures.
Furthermore a distribution transformer was fitted with temperature sensors and
heat run tests were performed. The results of the temperature tests were used to
verify the estimation techniques and to determine constants used for temperature
estimation.
Description
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.
Keywords
SRAPET,DSP/BIOS, Dissertations -- Electrical engineering, Theses -- Electrical engineering