МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS
Introduction. A significant proportion of earth faults in 6 - 35 kV networks is a transient and short-lived process, which is followed by an electric arc. Problem. In such cases, earth-fault protection that responds to steady-state current and voltage is not able to operate properly. Also, the use o...
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| Дата: | 2020 |
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| Мова: | English Ukrainian |
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National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine”
2020
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| Назва журналу: | Electrical Engineering & Electromechanics |
Репозитарії
Electrical Engineering & Electromechanics| id |
eiekhpieduua-article-195846 |
|---|---|
| record_format |
ojs |
| institution |
Electrical Engineering & Electromechanics |
| collection |
OJS |
| language |
English Ukrainian |
| topic |
електрична мережа захист від замикань на землю струм і напруга нульової послідовності перетворення Фур’є частотний спектр 621.316.925 electrical network earth fault protection zero sequence current and voltage Fourier transform frequency spectrum 621.316.925 |
| spellingShingle |
електрична мережа захист від замикань на землю струм і напруга нульової послідовності перетворення Фур’є частотний спектр 621.316.925 electrical network earth fault protection zero sequence current and voltage Fourier transform frequency spectrum 621.316.925 Syvokobylenko, V. F. Lysenko, V. A. МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| topic_facet |
електрична мережа захист від замикань на землю струм і напруга нульової послідовності перетворення Фур’є частотний спектр 621.316.925 electrical network earth fault protection zero sequence current and voltage Fourier transform frequency spectrum 621.316.925 |
| format |
Article |
| author |
Syvokobylenko, V. F. Lysenko, V. A. |
| author_facet |
Syvokobylenko, V. F. Lysenko, V. A. |
| author_sort |
Syvokobylenko, V. F. |
| title |
МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| title_short |
МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| title_full |
МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| title_fullStr |
МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| title_full_unstemmed |
МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS |
| title_sort |
мultifrequency protecting method against earth-faults of phase in the compensated electric networks |
| title_alt |
МУЛЬТИЧАСТОТНИЙ МЕТОД ЗАХИСТУ ВІД ЗАМИКАНЬ ФАЗИ НА ЗЕМЛЮ В КОМПЕНСОВАНИХ ЕЛЕКТРИЧНИХ МЕРЕЖАХ |
| description |
Introduction. A significant proportion of earth faults in 6 - 35 kV networks is a transient and short-lived process, which is followed by an electric arc. Problem. In such cases, earth-fault protection that responds to steady-state current and voltage is not able to operate properly. Also, the use of the Petersen coil to compensate for the capacitive earth fault current complicates the protection function because it significantly reduces the single phase earth fault current in steady state. Purpose. To develop selective single-phase earth faults protection algorithm using harmonic components that occur in zero-sequence currents and voltage in the transient process. Method. A mathematical model of the power supply system is applied to study the frequency components of currents and voltage of zero sequence in compensated electrical networks with phase-to-earth faults, and a mathematical model is used to test the operation of the developed protection algorithm. The results showed that, the reactive power for harmonic components of the frequency greater than 100 Hz, which are separated from the current and voltage of zero sequence in compensated electrical networks on the damaged feeder, is positive regardless of the degree of compensation of the capacitive current. That may be the basis of the principle of directional protection. Originality. Phase-to-earth fault selective protection algorithm has been developed. In that algorithm, first derivatives of currents and voltages of zero sequence are found, to reduce the influence of aperiodic components. And then, by using of the Fourier transform, a number of harmonic orthogonal components are extracted from them. Reactive power is calculated for each of frequency component and their total sum is found. If that sum excess of threshold, the relay will make a decision. The reliability of the developed protection algorithm is confirmed by the results of mathematical modeling and verification of the test sample at the laboratory stand and by means of field signals that were recorded by digital loggers at the substations. |
| publisher |
National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” |
| publishDate |
2020 |
| url |
http://eie.khpi.edu.ua/article/view/2074-272X.2020.1.09 |
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2024-06-01T14:39:29Z |
| last_indexed |
2024-06-01T14:39:29Z |
| _version_ |
1800670039969366016 |
| spelling |
eiekhpieduua-article-1958462020-02-25T19:53:23Z МULTIFREQUENCY PROTECTING METHOD AGAINST EARTH-FAULTS OF PHASE IN THE COMPENSATED ELECTRIC NETWORKS МУЛЬТИЧАСТОТНИЙ МЕТОД ЗАХИСТУ ВІД ЗАМИКАНЬ ФАЗИ НА ЗЕМЛЮ В КОМПЕНСОВАНИХ ЕЛЕКТРИЧНИХ МЕРЕЖАХ Syvokobylenko, V. F. Lysenko, V. A. електрична мережа захист від замикань на землю струм і напруга нульової послідовності перетворення Фур’є частотний спектр 621.316.925 electrical network earth fault protection zero sequence current and voltage Fourier transform frequency spectrum 621.316.925 Introduction. A significant proportion of earth faults in 6 - 35 kV networks is a transient and short-lived process, which is followed by an electric arc. Problem. In such cases, earth-fault protection that responds to steady-state current and voltage is not able to operate properly. Also, the use of the Petersen coil to compensate for the capacitive earth fault current complicates the protection function because it significantly reduces the single phase earth fault current in steady state. Purpose. To develop selective single-phase earth faults protection algorithm using harmonic components that occur in zero-sequence currents and voltage in the transient process. Method. A mathematical model of the power supply system is applied to study the frequency components of currents and voltage of zero sequence in compensated electrical networks with phase-to-earth faults, and a mathematical model is used to test the operation of the developed protection algorithm. The results showed that, the reactive power for harmonic components of the frequency greater than 100 Hz, which are separated from the current and voltage of zero sequence in compensated electrical networks on the damaged feeder, is positive regardless of the degree of compensation of the capacitive current. That may be the basis of the principle of directional protection. Originality. Phase-to-earth fault selective protection algorithm has been developed. In that algorithm, first derivatives of currents and voltages of zero sequence are found, to reduce the influence of aperiodic components. And then, by using of the Fourier transform, a number of harmonic orthogonal components are extracted from them. Reactive power is calculated for each of frequency component and their total sum is found. If that sum excess of threshold, the relay will make a decision. The reliability of the developed protection algorithm is confirmed by the results of mathematical modeling and verification of the test sample at the laboratory stand and by means of field signals that were recorded by digital loggers at the substations. За допомогою математичної моделі компенсованої електричної мережі виконано аналіз струмів і напруг нульової послідовності при замиканнях фази на землю і показано, що в них під час перехідного процесу виникають вищі гармонійні складові, які обумовлені розрядом ємностей ушкодженої фази, дозарядом ємностей неушкоджених фаз, а також зростанням струму реактора в нейтралі мережі. Показано, що незалежно від ступеня компенсації реактором ємнісного струму промислової частоти, реактивна потужність для гармонічних складових струмів і напруг з частотою в два рази і більше промислової, є додатною для ушкодженого приєднання і від’ємною для неушкоджених. Це прийнято за основу в розробленому методі захисту направленої дії, в якому при замиканнях фази на землю спочатку визначають похідні струмів і напруг нульової послідовності, що зменшує вплив аперіодичних складових і підсилює складові вищих гармонік, а потім за допомогою перетворення Фур’є знаходять комплексні значення для ряду найбільш впливових гармонійних складових, більших за першу. За допомогою отриманих складових струмів і напруг для кожної частоти знаходять реактивну потужність, і якщо їх сума перевищує задану, то спрацьовує вихідний орган захисту. Достовірність розробленого методу захисту підтверджено результатами математичного моделювання і перевіркою роботи дослідного зразка на лабораторному стенді. National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” 2020-02-25 Article Article application/pdf application/pdf http://eie.khpi.edu.ua/article/view/2074-272X.2020.1.09 10.20998/2074-272X.2020.1.09 Electrical Engineering & Electromechanics; No. 1 (2020); 56-60 Электротехника и Электромеханика; № 1 (2020); 56-60 Електротехніка і Електромеханіка; № 1 (2020); 56-60 2309-3404 2074-272X en uk http://eie.khpi.edu.ua/article/view/2074-272X.2020.1.09/197146 http://eie.khpi.edu.ua/article/view/2074-272X.2020.1.09/197147 Copyright (c) 2020 V. F. Syvokobylenko, V. A. Lysenko https://creativecommons.org/licenses/by-nc/4.0 |