Determination of individual values of four-element equivalent circuits elements parameters at technical diagnostics of insulation by absorption methods

Authors

DOI:

https://doi.org/10.20998/2074-272X.2023.4.10

Keywords:

non-destructive methods of insulation diagnostics, absorption methods of diagnostics, parameters of elements of insulation equivalent circuits

Abstract

The aim of this article is to present a methodology of determining of the individual values of the parameters of four-element equivalent circuits for insulation with through conductivity. Methodology. The proposed method consists in the fact that at a time interval of more than 10 s, when the charge indicator no longer contributes to the leakage current, three points t1, t2 and t3 are selected, such that t2 – t1 = t3 – t2. To be able to determine the absorption coefficient R60/R15, it is recommended to take t1 = 15 s, t2 = 37.5 s and t3 = 60 s. At the same time, by subtracting I(t2) – I(t1) and I(t3) – I(t2), the constant component of the absorption curve is excluded and it becomes possible to determine the individual values of the parameters of the generalized equivalent circuit of insulation, additionally using its conductivity in operator form. Results. As calculations show, the correct determination of the parameters of insulation equivalent circuit according to the proposed method is possible only with a certain ratio of these parameters. The charge time of the geometric capacitance Cg(R0+Rd), where R0 and Rd are the resistance that forms the charging exponent, and the resistance of the sensor, should be within 0.2 s <Cg(R0+Rd)<1 s, the time constant CaRa, where Ca and Ra are the capacitance and resistance of the absorption chain, should be more than 3 s, the product of CgRl, where Rl is the leakage resistance, more 0.5 s, the leakage resistance Rl is less than the absorption resistance Ra. Checking the methodology on a model example gives the values of the parameters of the insulation equivalent circuit that match the specified ones with high accuracy. Practical value. The use of individual values of the parameters of insulation equivalent circuits when applying absorption diagnostic methods with considering the time values and dimensional factors, allow to calculate all currently used diagnostic parameters, to determine the conditions of certain insulation types, as well as in more detail, in comparison with the existing approach, to assess the technical condition of the insulation and the reasons of its changes.

Author Biographies

V. M. Kyrylenko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»

PhD, Associate Professor

K. V. Kyrylenko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»

PhD

References

Protsenko O.R. Diagnostics of the electrical equipment condition. Course of lectures. Kyiv, Igor Sikorsky Kyiv Polytechnic Institute Publ., 2022. 162 p. (Ukr).

Németh B., Csépes G., Vörös C. Applicability of the dielectric response methods of diagnostics of power transformers: Hungarian experiences. 2011 Electrical Insulation Conference (EIC), 2011, pp. 49-53. doi: https://doi.org/10.1109/EIC.2011.5996114.

Saha T.K., Purkait P., Muller F. Deriving an Equivalent Circuit of Transformers Insulation for Understanding the Dielectric Response Measurements. IEEE Transactions on Power Delivery, 2005, vol. 20, no. 1, pp. 149-157. doi: https://doi.org/10.1109/TPWRD.2004.835436.

Soni G., Dutta S., Baral A. Condition Monitoring of Power Transformer Insulation by Return Voltage Measurement. 2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON), 2021, pp. 108-112. doi: https://doi.org/10.1109/CATCON52335.2021.9670485.

Sarkar S., Sharma T., Baral A., Chatterjee B., Dey D., Chakravorti S. A new approach for determination of moisture in paper insulation of in-situ power transformers by combining polarization-depolarization current and return voltage measurement results. IEEE Transactions on Dielectrics and Electrical Insulation, 2013, vol. 20, no. 6, pp. 2325-2334. doi: https://doi.org/10.1109/TDEI.2013.6678886.

Gavrilă D.E., Ciprian I., Gavrilă H.C. Applying the Recovery Voltage Method (RVM) to Study the Degradation of High Power Transformer Insulation. Advanced Materials Research, 2014, vol. 911, pp. 260-265. doi: https://doi.org/10.4028/www.scientific.net/amr.911.260.

Martinez M., Pleite J. Improvement of RVM Test Interpretation Using a Debye Equivalent Circuit. 2019 6th International Advanced Research Workshop on Transformers (ARWtr), 2019, pp. 105-110. doi: https://doi.org/10.23919/ARWtr.2019.8930187.

Hubarevych O.V. Reliability and diagnostics of electrical equipment. Syevyerodonetsk, V. Dahl EUNU Publ., 2016. 248 p. (Ukr).

Khamevko O.N., Sushko D.L. Analysis of methods control and diagnostic parameters isolation the traction engine of direct current. Collected scientific works of Ukrainian State University of Railway Transport, 2014, no. 147, pp. 152-155. (Ukr). doi: https://doi.org/10.18664/1994-7852.147.2014.75121.

IEEE Std 43-2000. Recommended Practice for Testing Insulation Resistance of Rotating Machinery, 2000, 28 p. doi: https://doi.org/10.1109/IEEESTD.2000.91301.

Stone G.C., Sasic M. Experience with DC polarization-depolarization measurements on stator winding insulation. 2013 IEEE Electrical Insulation Conference (EIC), 2013, pp. 7-10. doi: https://doi.org/10.1109/EIC.2013.6554191.

Tamus Z.A., Berta I. Application of voltage response measurement on low voltage cables. 2009 IEEE Electrical Insulation Conference, 2009, pp. 444-447. doi: https://doi.org/10.1109/EIC.2009.5166387.

Filipović-Grčić B., Filipović-Grčić D., Uglešić I. Modeling of polarization in oil-paper insulation using recovery voltage measurements. International Review of Electrical Engineering, 2011, vol. 6, no. 1, pp. 430-437.

Bezprozvannych G.V., Kostukov I.O., Moskvitin E.S. Differentiation of absorption processes in inhomogeneous insulation by curve of recovering voltage of power high voltage cables. Technical Electrodynamics, 2021, no. 6, pp. 13-19. doi: https://doi.org/10.15407/techned2021.06.013.

Bezprozvannych, G. V., Moskvitin, E. S., & Kyessayev, A. G. The absorption characteristics of the phase and zone paper-impregnated insulation of power cable at direct voltage. Electrical Engineering & Electromechanics, 2015, no. 5, pp. 63-68. doi: https://doi.org/10.20998/2074-272X.2015.5.09.

SOU-N-EE-20.302:2007. Testing norms for electrical equipment. Kyiv, DP MOU «Voienne vydavnytstvo Ukrainy «Varta», 2007. 262 p. (Ukr).

Bezprozvannych G.V. Physical interpretation of the recovery voltage curves based on the equivalent circuits of an inhomogeneous dielectric. Technical Electrodynamics, 2009, no. 6, pp. 23-27. (Rus).

Bezprozvannych G.V., Kostiukov I.A. Error of control of electrical insulation structures by dielectric absorption parameters according to the concept of uncertainty of measurements. Electrical Engineering & Electromechanics, 2020, no. 1, pp. 47-51. doi: https://doi.org/10.20998/2074-272X.2020.1.07.

Bezprozvannych G.V., Kostiukov I.A. A method of wavelet analysis of time series of parameters of dielectric absorption of electrical insulating structures. Electrical Engineering & Electromechanics, 2020, no. 2, pp. 52-58. doi: https://doi.org/10.20998/2074-272X.2020.2.08.

Kyrylenko V.M., Kyrylenko K.V., Budko M.O., Denysiuk P.L. Reasoning of additional diagnostic parameters for electric insulation diagnostics by absorption methods. Electrical Engineering & Electromechanics, 2021, no. 6, pp. 39-45. doi: https://doi.org/10.20998/2074-272X.2021.6.06.

Published

2023-06-27

How to Cite

Kyrylenko, V. M., & Kyrylenko, K. V. (2023). Determination of individual values of four-element equivalent circuits elements parameters at technical diagnostics of insulation by absorption methods. Electrical Engineering & Electromechanics, (4), 65–74. https://doi.org/10.20998/2074-272X.2023.4.10

Issue

Section

Electrical Insulation and Cable Engineering