- citati u SCIndeksu: 0
- citati u CrossRef-u:0
- citati u Google Scholaru:[
 ]
- posete u poslednjih 30 dana:3
- preuzimanja u poslednjih 30 dana:2
|
|
|
2015, br. 25, str. 187-193
|
|
F-T dijagram parcijalnih pražnjenja kod krupnih generatora
Frequency-time diagram of partial discharge pulses recorded on large generators
aUniverzitet u Beogradu, Elektrotehnički institut 'Nikola Tesla' bUniverzitet u Beogradu, Elektrotehnički fakultet
e-adresa: nenad.kartalovic@ieent.org
Sažetak
U radu se analizira F-T dijagram parcijalnih pražnjenja kao savremeni pristup analizi podataka parcijalnih pražnjenja na visokonaponskim krupnim generatorima. Radi potrebnog razumevanja pojava data je definicija pojedinih tipova parcijalnih pražnjenja. Savremena F-T analiza impulsa podrazumeva izračunavanje njegove efektivne frekvencije i vremena trajanja koje su karakteristične za pojedini ulazni impuls, odnosno tip pražnjenja. Doprinos ovoj metodi je dat preko numeričke simulacije i eksperimentalne potvrde procesa parcijalnih pražnjenja odnosno tokova impulsa naelektrisanja i napona. Simuliran je visokonaponski objekat sa raspodeljenim parametrima pri čemu se pražnjenje dešava u prvom slučaju neposredno kod priključaka napajanja i merno-sprežne jedinice a u drugom udaljeno 10% električno gledano po dubini impedanse objekta. Električni parametri objekta su uzeti prema mogućim parametrima elektro-generatora. Rezultati pokazuju da je merenje protoka impulsa naelektrisanja daleko pouzdaniji način od merenja naponskih impulsa parcijalnih pražnjenja. Izveden je eksperiment na krupnom hidrogeneratoru koji je potvrdio rezultate simulacije. Sa druge strane pokazani su razlozi rasipanja vrednosti na F-T dijagramu. Za rad je korišćen softverski paket Matlab (Simulink).
Abstract
This paper analyses the use of equivalent frequency-equivalent time diagram (FT diagram) of partial discharge (PD) pulses, regarding voltage and charge pulses. The described approach is widely used for large generators insulation testing purposes. For sake of clarity the certain types of partial discharge phenomena in insulation of electric machines are described and explained. The contemporary FT analysis of PD pulses is based on equivalent frequency and equivalent pulse time width derived by signal processing techniques and calculations. The numerical simulation derived and experimentally derived results are compared and evaluated for each kind of PD pulses (voltage or charge pulses). Next, the high voltage (HV) device with distributed parameters connected to HV voltage source is simulated. The parameters used in the simulation correspond to one real large synchronous generator. The obtained results lead us to the conclusion that the processing of the strain of PD charge pulses gives much more accurate results than the processing of the strain of PD voltage pulses. The experiment conducted on a large hydro generator confirmed the previous conclusions. At a same time, the sources of recorded results dispersion are shown and explained.
|
|
|
|
Reference
|
|
|
*** (2000) High-voltage test techniques: Partial discharge measurements. IEC 60270
|
|
  
|
Altenburger, R., Heitz, C., Timmer, J. (2002) Analysis of phase-resolved partial discharge patterns of voids based on a stochastic process approach. Journal of Physics D: Applied Physics, 35(11): 1149-1163
|
|
|
Azuaje, C., Millan, A. (2006) Stator Deformation of Large Hydrogenerators and Its Effects on the Machines. u: IEEE/PES Transmission & Distribution Conference and Exposition: Latin America, pp.1-5
|
|
|
Boashash, B. (2003) Time-Frequency Signal and System Analysis. u: Time Frequency Analysis, Amsterdam: Elsevier, str. 85-158
|
|
|
Elektroprivreda Srbije, Elektrotehnički institut Nikola Tesla (2013) Formiranje dijagnostičkog centra za realizaciju monitoringa parcijalnih pražnjenja u is na generatorima u elektranama EPS. Beograd
|
|
1
|
Frigo, M., Johnson, S.G. (1998) FFTW: An Adaptive Software Architecture for the FFT. u: Proc. of the Int. Conf. on Acoustics, Speech, and Signal Processing, Vol. 3, pp. 1381-1384
|
|
|
Kartalović, N., Miljaković-Jevtić, I., Zec, F., Žigić, A., Babić, B. (2015) Savremene metode monitoringa i analize parcijalnih pražnjenja kod velikih generatora. u: 59. ETRAN, 8.-11. juna 2015, Srebrno jezero, Srbija, EE, EE2.3
|
|
|
Kartalović, N., Milosavljević, S., Jevtić-Miljaković, I. (2010) Numerička Analiza naelektrisanja parcijalnih pražnjenja. u: 54. Konferencije za ETRAN, Donji Milanovac, jun, Zbornik radova
|
|
|
Kartalović, N. (2000) Stohastičnost dielektrične čvrstoće gasne izolacije, ETF Beograd. disertacija
|
|
1 
|
Kartalović, N., Kovačević, D., Milosavljević, S. (2011) An advanced model of partial discharge in electrical insulation. Facta universitatis - series: Electronics and Energetics, vol. 24, br. 1, str. 41-55
|
|
|
Lim, Y.S., Koo, J.Y. (2003) Comparative Analysis of Partial Discharge Patterns from Different Artificial Defects by Means of Conventional Phase-Resolved Partial Discharge Analysis and a Novel Chaotic Analysis of Partial Discharge. Journal of the Korean Physical Society, Vol. 42, No. 6, pp. 755-764. June
|
|
|
Milošević, A., Kartalović, N., Gavrilović, B., Savić, M.S. (2007) Numeričko modelovanje parametara parcijalnih pražnjenja. NM9 ETRAN 51, Herceg Novi
|
|
|
Morshuis, P.H.F. (2005) Degradation of solid dielectrics due to internal partial discharge: some thoughts on progress made and where to go now. IEEE Transactions on Dielectrics and Electrical Insulation, 12(5): 905-913
|
|
|
Osmokrovic, P., Kartalovic, N., Atanackov, N., Ostojic, D. (2000) Model law for gas isolated system. IEEE Transactions on Plasma Science, 28(1): 298-302
|
|
|
Schwab, A.J. (1981) Hoshspanungs Messtechnik: Messgerate und Messverfahren. Heidelberg: Springer-Verlag
|
|
|
Toader, M., Mariana, D. (2000) Electrical insulation study using partial discharge model. u: Electrotechnical Conference, 2000. MELECON 2000. 10th Mediterranean, 29-31 May 2000, Volume 3, Page(s): 1060 - 1063
|
|
|
|
|