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provides Real and Independent Test Results
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provides Real and Independent Test Results
Real Independent Testing
provides Real and Independent Test Results
Real Independent Testing
provides Real and Independent Test Results
Real Independent Testing
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Real Independent Testing
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« EGU HV laboratory was established in 1953. The laboratory provides an extensive set of activities in the field of testing, metrology, research, development and consultancy in electricity generation, transmission and distribution expert fields. »
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Publication

"Transformer energization from remote weak voltage sources – two study cases"
Kočiš L., Švancar M.CIGRE SC A2 & C4 JOINT COLLOQUIUM 2013, Zurich
"The measurement of fast transients during shunt reactors 420 kV switching using electric field sensors"
L. Kočiš, J. Jíra, M. ŠvancarInternational Conference on Power Systems Transients, Cavtat, Croatia, 2015
"AROPO - Complex diagnostic system based on transients analysis"
M. Švancar, L. Kočiš, P. SpurnýInternational Conference on Power Systems Transients, Cavtat, Croatia, 2015
"Model of ferroresonance in tertiary circuit of power transformers 400/110 kV"
Kočiš L., Švancar M.EEUG Meeting 2001, Bristol
"No load switching of overhead line 420 kV - comparison of field measurement and ATP model results"
Kočiš L., Švancar M. EEUG Meeting 2001, Bristol
"Protection of lines by MOAs - influence on line failure rate due to lightning overvoltages"
Kočiš L., Švancar M.National conference of CIRED, Tábor, November 2001
"Switching overvoltages caused by restrikes of circuit braker opening no load line"
Kočiš L., Novotný J.12th International Symposium on High Voltage Engineering ISH’01, Bangalore, August 2001
"Optimisation of lightning overvoltage protection in HV substation"
Kočiš L., Švancar M., Zeman I., Arnold A.CIGRE 2000 Session, Paris
"Overvoltage protection of substations 110 kV"
Kočiš L., Švancar M., Novotný J. National conference of CIRED,Tábor, November 2000
"Method of assesment of MOA operation reliability"
Redrugina M.N., Schur S.S., Kočiš L.CIGRE SC 33 Conference 2000 Prague
"Lightning in HV substations - overvoltage transients of HV and grounding conductive structures"
Kočiš L., Novotný J., Švancar M.CIGRE SC 33 Conference 2000 Prague
"Power transformer diagnostic monitoring system and three years operation experience"
Kočiš L., Švancar M.CIGRE SC 33 Conference 2000 Prague
"Model of grounding grid within EMTP"
Kočiš L., Novotný J.CIGRE SC 33 Conference 2000 Prague
"The influence of the grounding structure on backflashes in 420 kV substation"
Kočiš L., Švancar M., Novotný J.EEUG Meeting 2000, Wroclaw
"Bridge method of PD measurement"
Kočiš L., Bolech J.9th International Conference TVN in Košice, September 99
"Application of PD detector VYZER for searching of hv equipment with partial discharges"
Kočiš L.9th International Conference TVN in Košice, September 99
"Ferroresonant overvoltages of voltage transformers - simple method, how to measure a VTs magnetizing curve"
Kočiš L.1999 CIGRE SC 33 Colloquium, Lucern
"Dimensioning and optimal location of metal oxide surge arresters in substations"
Kočiš L., Švancar M.National conference of CIRED, Tábor, November 1999
"Analysis of MOA location in substation"
Kočiš L., Švancar M.11th International Symposium on High Voltage Engineering ISH’99, London, August 1999
"Protective efect of MOAs in various configurations"
Kočiš L. conference CIRED, Tábor, listopad 1998
"Comparison of measured and modelled voltage time characteristics of insulator string"
Kočiš L., Švancar M.EEUG Meeting, November 1998 Prague
"Model of five 400 kV Substations exposed to lightning overvoltages coming from line with near direct stroke or backflashover"
Kočiš L., Švancar M.CIGRE International Conference on Insulation Coordination for Electricity Development in Central European Countries, Zagreb, September 1998
"Fast transient overvoltages in substation"
Kočiš L., Švancar M., Aschenbrenner V., Vokálek J., Kopejtková D., Zeman I.10th International Symposium on High Voltage Engineering ISH’97, Montreal, August 1997
"Diagnostics of HV current transformer insulation"
Kočiš L., Vokálek J., Zeman P.10th International Symposium on High Voltage Engineering ISH’97, Montreal, August 1997
"Diagnostic monitoring system for HV equipment"
Kočiš L., Švancar M., Vokálek J.VI. International Electrical Insulation Conference, Bilbao, October 1997
"Dynamic changes of power loss factor of current transformer insulation in operation"
Kočiš L.Conference Diagnostika 97, Plzeň, September 1997
"Diagnostic monitoring system for HV equipment"
Kočiš L ., Švancar M., Vokálek J.International Conference Diagnostika 97, Plzeň, September 1997
"Diagnostics of HV current transformer insulation"
Kočiš L., Vokálek J.Doble Engineering Coloquium on High Voltage Apparatus Diagnostics, Athens, November 1996
"Travelling overvoltage waves in substation"
Kočiš L. Švancar M., Aschenbrenner V., Vokálek J. 8. International Conference High Voltage Technique, Stará Lesná, Slovakia, September 1996
"On-line PD measurement of large number of HV equipment in operation"
Kočiš L., Vokálek J.9th International Symposium on High Voltage ISH 95, Graz, September 1995
"Model of interrupted earth connection"
Švancar M., Kočiš L.1st National Symposium of ATP - EMTP users, Ostrava, October 1995
"A simple model of ferroresonance"
Švancar M., Kočiš L.1st National Symposium of ATP - EMTP users, Ostrava, October 1995
"Generation and measurement of very fast impulses of voltage and electromagnetic field"
Kočiš. L.seminar EMI-TOR Prague 1995
"Practical techniques for reaching of high level EM immunity of systems against HF disturbances"
Kočiš L.seminar EMI-TOR Prague 1994
"Comparison of capacitive and inductive voltage transformers"
Kočiš L.seminar ENES a EZ - Instrument transformers in networks 110, 220 a 400 kV, Prague, October 1994
"Some rules and techniques for design of an equipment with high immunity against EM disturbances"
Kočiš. Lseminar EMC Vyškov, September 1993
"System generated electromagnetic pulse (EMP) with very fast front"
Aschenbrenner V., Kočiš L.Interelektrotest IET 89 meeting, Lázně Bohdaneč 1989
"PD measurement of large power transformers on-site"
Valenta L, Kočiš L.XII. Symposium on Transformers, Karlovy Vary 1984
"Overvoltage measurement on cascade current transformers exposed by current impulses"
Kučera J., Kočiš L.bulletin Interelektrotest 7/84
"Transients in cascade current transformers TFNDK 500 exposed by short-circuit current waves and consequent insulating requirements"
Kučera J., Kočiš L.Energetika 9/83
"Contribution to the problem of establishing of an admissible level of partial discharges in transformers"
Kočiš L., Valenta L.volume BEZ Transformátory 3/83
"Influence of circuit breaker failures to dielectric strength of transformers 400 kV"
Kočiš L., Valenta L.national conference „Reliability of power delivery“ in Brno, October 1981
"Partial discharge parameters and their location in transformers"
Kočiš L., Valenta L.Conference Interelektrotest Dobřichovice 1981
"Influence of conductive ice on electric strength of HV insulators"
V. Sklenicka et al.International Symposium on Pollution Performance of Insulators and Surge Diverters, Proceedings Vol. 1, paper 1.02, Madras, India, 1983
"Selection of insulators for polluted areas"
V. Sklenicka, J.Vokalek, J.Kunt, V.Vachek, I.ZemanCIGRE, 1990 Session, Paris 1990
"Contamination performance of zinc oxide arresters"
M.N.Redrugina, S.I.Garasim, B.B.Usov, S.S. Shur, V.Sklenicka, J.Vokalek7th ISH, Dresden, August 1991
"Hot line insulator washing"
V. SklenickaICOLIM 92, Keszthely, Hungaria 1992, paper No. 37-1
"Thermal modes of metal oxide surge arresters under normal and polluted conditions - calculation and measurement"
M.N.Redrugina, S.S. Shur, V.Sklenicka, J.VokalekCIGRE 1992 Session, Paris, paper No. 33-202
"Laboratory comparative tests of composite insulators"
V.Sklenicka, J.Vokalek9th ISH, Graz 1995, paper No.3182
"Horizon for contamination and temperature resistant metal oxide arresters: Calculations and experiments"
M.N.Redrugina, S.S. Shur, V.Sklenicka, J.Vokalek9th ISH Graz, Austria, August 28 - September 1, 1995
"Insulators in Icing Conditions: Selection and Measures for Reliability Increasing"
V. Sklenicka, J. VokalekProceedings of the 7th International Workshop on Atmospheric Icing of Structures, Chicoutimi, Canada, 1996, pp. 72-76
" Some investigation of the reliability of metal oxide surge arresters 500 kV and 750 kV under even harmonics excitation"
M.N.Redrugina, S.S. Shur, V.Sklenicka, J.Vokalek10th ISH, Montreal, Canada, August 1997
"Influence of ice and snow on the flashover performance of outdoor insulation"
V. Sklenicka et al.CIGRE SC 33 Conference, Zagreb, Croatia, September 1998
"Influence of pollution and environmental conditions on a behaviour of metal oxide surge arresters"
Sklenicka V.Czech national CIRED committee conference, October 1998, Tabor, Czech Republic
"Selection of test method for estimation of degradation of outdoor insulators operated in polluted conditions"
V. Sklenicka, J.VokalekCIGRE SC 33 Colloquium, Luzern, 1999
"Pollution performance of double insulator assemblies"
V. Sklenicka, P.C.van der Wal11th ISH, London 1999, paper No. 4.100 S25
"Study on upgrading of single 220 kV overhead line to double circuit 220/400 kV line"
Sklenička V, Vokálek J., Brousil P., Laub C. CIGRE SC 33 Conference, Paper No.S2-2, September 7 - 8, 2000, Prague, Czech Republic
“Utilization and service experience with composite insulators in Czech power system.”
Sklenička V., Zeman I. Proceedings of 2001 World Insulator Congress, Shanghai, China, November 18 - 21, 2001
"Determination of the bandwidth of high-voltage dividers"
Totev J.Poster 97 - 1st International Student Conference on Electrical Engineering. May 21-22, 1997, Prague, Czech Republic
"Overvoltages Detection Using the Discrete Wavelet Transform"
Totev J.Poster 98 - 2nd International Student Conference on Electrical Engineering. May 28, 1998, Prague, Czech Republic
"Effect of Step Response Parameters on Measuring Errors in Impulse voltage Measurements"
Totev J. and Piiroinen,J.Post Graduate Seminar of High Voltage Engineering, August 1998, Imatra, Finland
"Detection of Transformer Windings Failures Using the Mathematical Transforms"
Totev J.Poster 99 – 3rd International Student Conference on Electrical Engineering. May 1999, Prague, Czech Republic
"Sensitivity of Methods for Diagnostics of Power Transformer Windings"
Hasman T., Kvasnička V. and Totev J.International Symposium on High Voltage Engineering – ISH 99, August 1999, London, England
"Detection of Transformer Windings Failures Using the Transfer Function Method and the Wavelet Transform"
Totev J.CIGRE SC 33 Conference. September 2000, Prague, Czech Republic.
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