Digital Current Measurement Element for Operation During Current Transformer Severe Saturation
The development and implementation of a digital current measurement element for proper operation during current transformer (CT) magnetic core severe saturation are considered. CT transient performance is often accompanied by primary current transformation to secondary one with great errors. In this...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Belarusian National Technical University
2018-12-01
|
| Series: | Izvestiâ Vysših Učebnyh Zavedenij i Ènergetičeskih ob Edinennij SNG. Ènergetika |
| Subjects: | |
| Online Access: | https://energy.bntu.by/jour/article/view/1404 |
| _version_ | 1797879770269089792 |
|---|---|
| author | Yu. V. Rumiantsev F. A. Romaniuk V. Yu. Rumiantsev I. V. Novash |
| author_facet | Yu. V. Rumiantsev F. A. Romaniuk V. Yu. Rumiantsev I. V. Novash |
| author_sort | Yu. V. Rumiantsev |
| collection | DOAJ |
| description | The development and implementation of a digital current measurement element for proper operation during current transformer (CT) magnetic core severe saturation are considered. CT transient performance is often accompanied by primary current transformation to secondary one with great errors. In this case the secondary CT current which is an input signal of the digital measurement element differs from the ideally transformed CT current both in shape and magnitude. This causes impermissible signal settling time at the standard digital measurement element output. As a result, main requirements to the protection devices such as reliability and fast operation are violated, that in some cases makes the high-speed protection device ineffective. To solve this problem, it is proposed to form the output signal of the digital current measurement element in depending on the input signal total harmonic distortion (THD) coefficient value. Moreover, it is worthwhile to form the output signal so that for a low CT saturation conditions this output signal slightly differs from the secondary current RMS value, and for a severe CT saturation conditions it exceeds this value. Digital current measurement element model has been developed and implemented in the MatLab-Simulink environment using the following blocks: a digital filter block responsible for the input signal fundamental frequency component magnitude calculation; a digital filter block responsible for the input signal RMS value calculation; and, also, a standard blocks for basic mathematical calculations needed for proper functioning of the proposed measurement element. The functional testing of the proposed digital current measurement element model was carried out using the signal, that was similar in form to the waveform of the secondary current of the severe saturated CT. The tests that had been performed confirmed that the proposed digital current measurement element in comparison with the standard current measurement element ensures stable functioning and enhanced operation time during transients. |
| first_indexed | 2024-04-10T02:52:29Z |
| format | Article |
| id | doaj.art-d0bbf467624447f990f2f3553542827d |
| institution | Directory Open Access Journal |
| issn | 1029-7448 2414-0341 |
| language | Russian |
| last_indexed | 2024-04-10T02:52:29Z |
| publishDate | 2018-12-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Izvestiâ Vysših Učebnyh Zavedenij i Ènergetičeskih ob Edinennij SNG. Ènergetika |
| spelling | doaj.art-d0bbf467624447f990f2f3553542827d2023-03-13T07:41:51ZrusBelarusian National Technical UniversityIzvestiâ Vysših Učebnyh Zavedenij i Ènergetičeskih ob Edinennij SNG. Ènergetika1029-74482414-03412018-12-0161648349310.21122/1029-7448-2018-61-6-483-4931348Digital Current Measurement Element for Operation During Current Transformer Severe SaturationYu. V. Rumiantsev0F. A. Romaniuk1V. Yu. Rumiantsev2I. V. Novash3Белорусский национальный технический университетБелорусский национальный технический университетБелорусский национальный технический университетБелорусский национальный технический университетThe development and implementation of a digital current measurement element for proper operation during current transformer (CT) magnetic core severe saturation are considered. CT transient performance is often accompanied by primary current transformation to secondary one with great errors. In this case the secondary CT current which is an input signal of the digital measurement element differs from the ideally transformed CT current both in shape and magnitude. This causes impermissible signal settling time at the standard digital measurement element output. As a result, main requirements to the protection devices such as reliability and fast operation are violated, that in some cases makes the high-speed protection device ineffective. To solve this problem, it is proposed to form the output signal of the digital current measurement element in depending on the input signal total harmonic distortion (THD) coefficient value. Moreover, it is worthwhile to form the output signal so that for a low CT saturation conditions this output signal slightly differs from the secondary current RMS value, and for a severe CT saturation conditions it exceeds this value. Digital current measurement element model has been developed and implemented in the MatLab-Simulink environment using the following blocks: a digital filter block responsible for the input signal fundamental frequency component magnitude calculation; a digital filter block responsible for the input signal RMS value calculation; and, also, a standard blocks for basic mathematical calculations needed for proper functioning of the proposed measurement element. The functional testing of the proposed digital current measurement element model was carried out using the signal, that was similar in form to the waveform of the secondary current of the severe saturated CT. The tests that had been performed confirmed that the proposed digital current measurement element in comparison with the standard current measurement element ensures stable functioning and enhanced operation time during transients.https://energy.bntu.by/jour/article/view/1404цифровой измерительный орган токатрансформатор токанасыщение магнитопроводацифровой фильтрдискретное преобразование фурьеmatlabsimulinksimpowersystems |
| spellingShingle | Yu. V. Rumiantsev F. A. Romaniuk V. Yu. Rumiantsev I. V. Novash Digital Current Measurement Element for Operation During Current Transformer Severe Saturation Izvestiâ Vysših Učebnyh Zavedenij i Ènergetičeskih ob Edinennij SNG. Ènergetika цифровой измерительный орган тока трансформатор тока насыщение магнитопровода цифровой фильтр дискретное преобразование фурье matlab simulink simpowersystems |
| title | Digital Current Measurement Element for Operation During Current Transformer Severe Saturation |
| title_full | Digital Current Measurement Element for Operation During Current Transformer Severe Saturation |
| title_fullStr | Digital Current Measurement Element for Operation During Current Transformer Severe Saturation |
| title_full_unstemmed | Digital Current Measurement Element for Operation During Current Transformer Severe Saturation |
| title_short | Digital Current Measurement Element for Operation During Current Transformer Severe Saturation |
| title_sort | digital current measurement element for operation during current transformer severe saturation |
| topic | цифровой измерительный орган тока трансформатор тока насыщение магнитопровода цифровой фильтр дискретное преобразование фурье matlab simulink simpowersystems |
| url | https://energy.bntu.by/jour/article/view/1404 |
| work_keys_str_mv | AT yuvrumiantsev digitalcurrentmeasurementelementforoperationduringcurrenttransformerseveresaturation AT faromaniuk digitalcurrentmeasurementelementforoperationduringcurrenttransformerseveresaturation AT vyurumiantsev digitalcurrentmeasurementelementforoperationduringcurrenttransformerseveresaturation AT ivnovash digitalcurrentmeasurementelementforoperationduringcurrenttransformerseveresaturation |