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Induction motors protection against overcurrent taking into account nonlinear distortion of phase current

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Category: Electrical complexes and systems

Last Updated on 27 October 2015

Published on 27 October 2015

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Authors:

O.H. Sereda, Cand. Sci. (Tech.), Associate Professor, National Technical University “Kharkiv Polytechnic Institute”, Senior Lecturer of the Department of Electrical apparatus, Kharkiv, Ukraine.

Abstract:

Purpose. Theoretical justification and engineering of induction motors heat protection method from overload currents considering nonlinear distortion of phase currents and its implementation as a microprocessor device functioning algorithm.

Methodology. The research involved the theory of the representing complex harmonic oscillations analog signals expansion into the oscillation spectrum forming elementary harmonic components in order to compare their properties by applying the theory of discrete signals and systems, as well as methods of spectral analysis and discrete signals filtering. The harmonic analysis versatility is that any periodic signal may be synthesized from harmonic oscillation certain amplitude, frequency and initial phase. A mathematical model for determining the phase current harmonic content of power supply networks with isolated neutral and non-linear loads types and, as a consequence, the distortion of sinusoidal phase currents change is developed by multiplying the analog current in time dependency on the grate delta-function with different sampling intervals, in which the use of simple and widely used in relay protection units, in particular circuit breakers microprocessor trip, mathematical operations of integration squares instantaneous current allows the most in harmony with the mathematical tools to build other network protection types.

Findings. The necessity to increase the sensitivity of the induction motors heat protection from overload currents taking into account nonlinear distortion of the phase currents was proved. By nonlinear distortion harmonic analysis of the phase currents the motor protection reliability increasing provided by taking into account the higher harmonic components of the phase currents, namely, the fifth harmonic current, which causes to additional losses and heating of the stator winding. It uses the simplest and widely used in protective relaying mathematical apparatus determining of most significant higher harmonics currents RMS.

Originality. A possibility of extending the implemented protection list of circuit breakers trip units based on the digital processing of signals from the current sensors is theoretical research by the harmonious analysis of phase currents spectrum with the nonlinear distortions presence. A new technical solution was proposed that allows in online sliding monitoring mode to form response time of circuit breakers for reliable protection of induction motors from overload currents taking into account nonlinear distortion of the phase currents.

Practical value. The microprocessor protection functioning algorithm of induction motors is designed against impermissible heating coils with overload currents taking into account nonlinear distortion of the phase currents.

References:

1. Новое направление в создании рудничных взрывозащищенных трансформаторных подстанций на низшее напряжение до 3300 В / Н.М. Басов, В.С. Дзюбан, В.В. Кардаш [и др.] // Взрывозащищенное электрооборудование: сб. научных трудов. – Донецк: ООО „АИР“, 2010. – С. 61–71.

Basov, N.M., Dzyuban, V.S., Kardash, V.V., Koshkin, V.E. and Shvetsova, T.V. (2010), “New direction in creating mine explosion protected transformer substations for low voltage up to 3300 V”, Explosion Protected Electrical Equipment, pp. 61–71.

2. Жежеленко И.В. Высшие гармоники в системах электроснабжения промпредприятий; 4-е изд., перераб. и доп. / Жежеленко И.В. – М.: Энергоатомиздат, 2000. – 331 с.

Zhezhelenko, I.V. (2000), Vysshie garmoniki v sistemakh elektrosnabzheniya prompredpriyatiy. 4-e izd [The Higher Harmonics in Industrial Plants Power Systems. 4th ed.], Energoatomizdat, Moscow, Russia, 331 p.

3. Барутсков И.Б. Гармонические искажения при работе преобразователей частоты /И.Б. Барутсков, С.А. Вдовенко, Е.В. Цыганков // Главный энергетик. – 2011. – №6. – С. 5–15.

Barutskov, I.B., Vdovenko, S.A. and Tsygankov, E.V. (2011), “Harmonic distortion at the frequency converter”, Chief Power Engineer, no. 6, pp. 5–15.

4. Collombet, C. Harmonic disturbances in networks, and their treatment / C. Collombet, Lupin, J.M. and Schonek, J. // Schneider Electric Technical collection. – 2000. – Cahier technique no. 152. – 29 р.

Collombet, C., Lupin, J.M. and Schonek, J. (2000), “Harmonic disturbances in networks, and their treatment”, Schneider Electric Technical Collection, Cahier technique, no. 152, pp. 29.

5. Пат №106030. України МПК (2014.01) Н02Н 3/08 (2006.01), Н02Н 7/085 (2006.01), Н01Н 73/00. Спосіб захисту електродвигунів від струмів перевантаження / Кобозєв О.С., Середа О.Г., Заратуйко А.В.; патентовласник Україна – №а2013112986; заявл. 08.11.2013; опубл. 10.07.2014. Бюл. №13.

Kobozev, O.S., Sereda O.G. and Zaratuiko, A.V. (2014), Sposіb zakhystu elektrodvyhunіv vіd strumіv perevantazhennia [Motor Protection Method From Overload Currents], Pat. 106030 Ukraine, Industrial property. Official Bulletin, Vol. 13, Kyiv, Ukraine.

6. ГОСТ Р 51677-2000. Машины электрические асинхронные мощностью от 1 до 400 кВт включительно. Дви-гатели. Показатели энергоэффективности. – [Введен с 2001.07.01] – М.: ИПК Издательство стандартов, 2001. – 7 с.

ISO 51677-2000. (2001), Mashiny elektricheskie asinkhronnye moschnostyu ot 1 do 400 kVt vklyuchitelno. Dviga-teli. Pokazateli energoeffektivnosti [Induction Electric Machines Ranging from 1 to 400 kW. Motors. Energy Efficiency Indicators], IPK Izdatelstvo standartov, Moscow, Russia.

7. Кобозєв О.С. Визначення діючих значень періодичного несинусоїдального струму та його непарних гармонік за дискретними значеннями безперервної залежності струму в часі / О.С. Кобозєв, О.Г.Середа, В.В. Моргун // Еле-ктротехніка і електромеханіка. – 2012. – №5. – C. 21-26.

Kobozev, O.S., Sereda O.G. and Morgun, V.V. (2012), “RMS periodic non-sinusoidal current determination and its odd harmonics of the continuous time current dependence discrete values”, Elektrotekhnіka і Elektromekhanіka, no. 5, pp. 21–26.

8. Цифровая обработка сигналов на основе теоремы Уиттекера-Котельникова-Шеннона / Басараб М.А., Зелкин Е.Г., Кравченко В.Ф., Яковлев В.П.  – М.: Радиотехника, 2004. – 72 с.

Basarab, M.A., Zelkina, E.G., Kravchenko, V.F. and Yakovlev, V.P. (2004), Tsifrovaya obrabotka signalov na osnove teoremy Uittekera-Kotelnikova-Shennona [Digital Signal Processing Based on the Whittaker-Kotelnikov-Shannon Theorem], Radiotehnika, Moscow, Russia, 72 p.

9. ГОСТ 13109-97. Электрическая энергия. Совместимость технических средств электромагнитная. Нормы качества электрической энергии в системах электроснабжения общего назначения. – [Введен с 1999.01.01.] – Минск: ИПК Издательство стандартов, 1998. – 35 с.

ISO 13109-97 (1998), Elektricheskaya energiya. Sovme-stimost tekhnicheskih sredstv elektromagnitnaya. Normy kachestva elektricheskoy energii v sistemakh elektrosnabzheniya obshchego naznacheniya [Electrical energy. Technical Equipment Electromagnetic Compatibility. Quality Standards for Electrical Energy in General Use Power Systems], IPK Izdatelstvo standartov, Minsk, Republic of Belarus.

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