Evaluation of localized flux and loss distribution in the corner joint and T joint of 1000 kVA transformer core
The work involved in this thesis relates to the measurement and evaluation on localized flux and losses distribution in 1000 kVA three phase transformer core using 3% silicon doped Grain Oriented (GO) material. The experiment was carried out on three (3) type of transformer core models namely the...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/31913/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/31913/2/Full%20text.pdf |
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| Summary: | The work involved in this thesis relates to the measurement and evaluation on
localized flux and losses distribution in 1000 kVA three phase transformer core
using 3% silicon doped Grain Oriented (GO) material. The experiment was
carried out on three (3) type of transformer core models namely the 45° V notch T
joint with 3mm overlap distance, 45° V notch T joint with 5mm overlap distance
and 90° butt lap T joint design with 10 mm overlap distance. Measurement work
dealt with variation of the magnitude and directional of the fundamental
components as well as the harmonic components. Power loss measurement was
conducted using three phase no load loss method. A few array of search coils
made up of orthogonal, single turn and normal search coils were used to detect the
in-plane and normal flux. Thermometric method adopting variation of temperature
rise was selected to capture the power loss. The V notch T joint 3mm overlap
design had shown the lowest power loss at 0.845 W/kg at 1.5T 50Hz compared to
the V notch T joint 5mm overlap and butt lap 10mm design with difference of
1.3% and 5.79% respectively. Building factor of the V notch 3mm proved to be
the lowest compared to the other two design which is at 1.11,1.15 and 1.185. It
was noticed highest flux values were concentrated in the inner overlap area of the
corner joint. Highest losses are spotted at the same location where highest inplane
flux was presented. The third harmonic flux are highest in the butt lap T
joint area. Rotational flux and losses were also detected in corner joint and very
significant existence in the T joint area and butt lap design had produced the
highest core loss at 0.894 W/kg. Highest core loss is located in the T joint area
near both side of the inner corner of the center limb. The flux transfer works
between lamination in a complex manner in which a combination of in-plane and
normal flux move simultaneously within the laminations. Core geometry design
and overlap distance is believed to be the critical factors that can influence the
flux flow uniformity which ultimately can reduce power loss in the core. All in all
V notch T joint 3mm core design is found to be the most efficient and with
optimum performance. It is estimated that a saving of RM69.9 million per year
can be achieved if the V notch T joint 3mm core design is utilized in TNB
distribution network system. |
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