Modelling of current transformer for the application of error estimation, estimation factor and ratio error
The research contributed in the investigation of current transformer performance with harmonic distortion. Besides that, the research also contributed in enhances the current transformer efficiency by estimation the phase angle and ratio errors. In this thesis, the correction factors have been esti...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44128/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44128/2/full%20text.pdf |
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| Summary: | The research contributed in the investigation of current transformer performance with harmonic distortion. Besides that, the research also contributed in enhances the current transformer efficiency by estimation the phase angle and ratio errors. In this thesis, the
correction factors have been estimated to work up the current transformer performance and accuracy. Throughout this project, the current transformer 15/1A and 7.5/1A are tested with different percentages of total harmonic distortion. The first part of testing is done with software
simulation using PSCAD when current transformer modeled with different burden. The PSCAD simulation is compared in terms of primary and secondary current, harmonic current, current transformer ratio and burden. Different percentage of total harmonic distortion current is supplied to test the current transformer performance by using PSCAD software. PSCAD also simulate to see the current transformer saturation when operates with different values of
magnetizing impedance. Element of comparative studies was included in the simulation part by doing the comparison with the model from University of Manitoba and other researcher. The second part is the hardware comparison between the linear and non-linear loads used in current transformers. In this part, the bulbs used as linear loads and personal computers as
non-linear loads. Reaction and efficiency of current transformer are tested when connected with both types of loads and increasing the input current. Power meter analyzer (PM300) and VPAS software connected to the circuit to plot current waveform and measured phase angle error. The
next comparison is between current transformer class 1 and class 3 tested with burden 0.5ohm, 10 ohm and 25 ohm due to the availability of the resistor banks. From the overall experiment of software and hardware, results shows that different percentage of harmonics bring effects to the
current transformer in terms of efficiency, phase angle error and ratio error. The effect also
counted on the values of secondary burden. The harmonic effects on the current transformer
tested presence until the current transformer saturate. These are due to the increment of
primary current, DC component, harmonic and frequency changed. Otherwise, current
transformer error is strongly influenced by the non-linearity of the magnetizing current. Finally,
the study in this field is contributed to enhance current transformer performance in power
quality system. |
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