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1 CIGRE Regional South-East European Conference - RSEEC 2016 (3rd edition) October 10th - 12th 2016, University "Politehnica" of Bucharest, Romania
Proceedings of RSEEC 2016
Innovation for efficient
and effective management, solutions for power systems of the future!Organized by:
2Romanian National Committee "CIGRE"
33, Gen. Gh. Magheru Blvd., postal code RO-010325, Bucharest 1
Correspondence Address: Str. Olteni, Nr. 2 - 4, RO-030786, Bucharest, Romania Registration no. with the National Trade Register - 173/2007 - fiscal code: 20769417 Phone: +4 021 303 59 56; Fax: +4 021 303 58 30; www.cigre.org.roISSN 2392 - 716X
3CONTENTS
Papers
1. (#51) Criteria for oil selection suitable for use as insulating liquid in high voltage
Instrument Transformers.........................................................................................................11
B. PAHLAVANPOUR, J. NUNES, C. WOLMARANS
2. (#53) Live Operating and Efficiency of Equipment"s Management.........................................18
I. RODEAN, D. MORAR, V. BALAN, C. BOGUS, V. ORLANDEA, M. SIMBOTIN, S.SOVERESAN
3. (#54) Voltage regulation by grid-connected PV systems effects on distribution network
M. A. IONESCU, G. PRESADA (IORDACHE)
4. (#57) Continental European ENTSO-E power system extension by synchronous
interconnection with Ukrainian and Moldovan power systems................................................34
D. BOLBORICI, C. DIACONU, O. ZACHIA
5. (#58) Benefits of modern AIS substation design using DCB and NCITs.................................42
M. MAGNUSSON, T. ROININEN, A. FRANK
6. (#59) Considerations on Ranking Threats to Power System Security.......................................48
S. L. VORONCA
7. (#61) Development of electricity infrastructure in Europe e-Highway2050 project results ......54
C. DIACONU, S. SOARE, V. ZAHARIA, M. MARCOLT
8. (#62) Direct measurement of rotors temperatures of power electric machines.........................62
C. BULAI, P. CURIAC
9. (#63) Energizing of Large PM Rotors of Wind Turbine-Generators........................................71
P. CURIAC, D.H. KANG
10. (#64) Big Storage Systems......................................................................................................80
A. AMET, T. CHIULAN
11. (#65) The risk assessment for the refurbished TSO"s substations ............................................85
V. ZAHARESCU, C. STANESCU, M. RAUL, D. MORAR
412. (#68) Numerical evaluation of the effects of phase impedance asymmetry at an
untransposed overhead transmission line.................................................................................94
A. PANA, A. BALOI, F. MOLNAR-MATEI, N. CHIOSA
13. (#69) Switching requirements for disconnectors and earthing switches .................................103
I. HATEGAN, E. STOICESCU
14. (#72) Considerations on indicators for assessing the level of competition in the balancing
and ancillary services markets...............................................................................................108
P. ATANASOAE, R. PENTIUC, C. BOBRIC, E. HOPULELE
15. (#73) Advanced Techniques for inspecting Power Energy Equipment using Augmented
O. GHITA, C. BANICA, L. IACOBICI, I. D. HATEGAN
16. (#74) Intelligent System for Monitoring Energy Installations using self piloted Drones ........122
O. GHITA, C. BANICA, L. IACOBICI, I. D. HATEGAN
17. (#75) Integrated monitoring and control real-time system for the estimation of the
operational status of the power electrical networks assembly................................................126
C. MOLDOVEANU, A. VASILE, M. AVRAMESCU, A. TAVA, I. IONITA, G. IOSIF18. (#76) Intelligent equipment for monitoring power transformers disturbances in the
transmission and distribution power systems.........................................................................134
C. MOLDOVEANU, V. BREZOIANU, M. AVRAMESCU, A. VASILE,S. ZAHARESCU, A. TAVA, I. IONITA, G. IOSIF
19. (#77) 3D CAD/CAE Modeling software for the computation of Electromagnetic Field
Distribution in HV Substations and Investigation of Human Exposure..................................141
C. MUNTEANU, M. PURCAR
20. (#78) AC Interference Modeling, a Tool for Personnel Safety Investigation..........................149
M. PURCAR, C. MUNTEANU
21. (#80) Cornerstone in European Connection Codes implementation in Romanian technical
D. ILISIU
22. (#81) Voltage control in substations with many generation units injection ............................163
D. ILISIU, D. FIRICA
23. (#83) The use of cloud computing technologies for the effective management of the
resources of a modern city - SmartCity.................................................................................171
B. TATU
524. (#84) Improving Back-up Protection Systems in Power Grid using Wide Area
Synchrophasor Measurements...............................................................................................178
A. MIRON, M. DRAGOMIR, R. PENTIUC, C. POPA, C.E. BOBRIC25. (#86) T&D Utilities, Implementing a Successful Asset Investment Planning Strategy...........190
B. JOUFFROY
26. (#87) Virtual World Asset Management for Transmission System Operators What can
precise position tell you about your assets?...........................................................................196
R. HODDENBACH, P. MENTING, M. COLEMAN, J. BANGAY, J. BARONIAN27. (#88) Modeling of hybrid off-grid energy system for electrical energy production from
renewable sources.................................................................................................................201
C. UNGUREANU, C. D. POPA, S. BIDU
28. (#89) Holonic control-based solution for service restoration and switch allocation in power
distribution networks............................................................................................................213
V. VLAD, C. POPA, R. D. PENTIUC
29. (#90) Wide-Area Protection based on PMU Measurement....................................................221
C. HEYDE, E. LERCH, U. KERIN, R. KREBS, C. NGUYEN MAU30. (#91) DSA of Power Grids in Real-Time..............................................................................231
C. HEYDE, U. KERIN, R. KREBS, E. LERCH
31. (#92) Protection Security Assessment of Power Grids Improves Grid Reliability..................242
T. BOPP, R. GANJAVI, R. KREBS, B. NTSIN, M. DAUER, J. JAEGER32. (#93) The new revision of internal technical standard for power line and bus coupler
protection in correlation with SCADA internal standard .......................................................249
A. ROMANESCU
33. (#94) Implementation of special mathematics in energy transmission- Romanian Power
Grid Company Transelectrica ...............................................................................................254
V. ZAHARESCU, A. ROMANESCU
34. (#95) The road to interoperability - using the Common Information Model and the
Common Grid Model Exchange Standard.............................................................................260
A. TALPOS, C. BULAC
35. (#96) The process of identifying new projects under ENTSO-E rules....................................269
A. TOLEA, D. BOLBORICI C. BULAC
36. (#97) Improving the fault location for transmission lines using the actual measurements ......275
M. DRAGOMIR, GH. MORARU, A. MIRON
637. (#98) Electric Energy Storage Systems and regulatory framework........................................282
C. G. DIACONU, M. C. MARCOLT
38. (#99) Using electrical parameters measurement results in protection settings........................293
GH. MORARU, F. BALASIU
39. (#100) Coordinating Generating Units and Power System Protections ..................................301
F. BALASIU, GH. MORARU
40. (#101) Modeling of Differential Protection to AT 400 MVA for fault using the finite
element method ....................................................................................................................311
V. VILCU
41. (#102) Live working technologies and the limitation of the impact of maintenance on
people and environment........................................................................................................319
M. OLTEAN, O. JURASCU, G. COTRIGASAN, M. STANCU
42. (#103) Smart Grid and Cyber Security. Good Practices Guide for Implementing Cyber
Security in TSO"s SCADA Applications...............................................................................326
M. COTEANU, I. PAVALOAIA, R. HUCH, L. SPATARU
43. (#104) Sensitivity based analysis of voltage and reactive power in HV power grids..............332
L.-G. MANESCU, D. RUSINARU, M. CIONTU, M. ALBA, P.C.STROICA 7CIGRE Regional South-East European Conference
RSEEC 2016 (3rd edition)
October 10th - 12th 2016
University "Politehnica" of Bucharest, Romania
FOREWORD
On behalf of the Romanian National Committee of CIGRE, it is our great pleasure to welcome our distinguished guests of the third edition of CIGRE Regional South-East European Conference (RSEEC 2016), taking place in Bucharest, Romania, during October 10 th - 12th, 2016. RSEEC 2016 is organized by the CIGRE"s Romanian National Committee, as organizer, CNTEE Transelectrica (the Romanian TSO) and University "Politehnica" of Bucharest, as co- organizers - with kind support of CIGRE Paris. At its third edition, it is a major biennial event in power systems that provides an exceptional venue to CIGRE members and interested parties for presenting:Innovation for efficient and effective
management, solutions for power systems of the future! The conference brings together power systems engineers, decision makers, economists, academics and others with interest in the domain. The conference also promotes CIGRE as a strong technical organization, capable of contributing to the technical expertise and know-how through its study committees, conference proceedings and the technical documents. Main Topics include: 1) State of the Technology for electrical networks of the future;2) Electricity - key factor for society development; 3) Challenges in education of power system
workforce. We would like to give again a warm welcome to all RSEEC 2016 conference participants and to wish a successful and enjoyable meeting. We hope that everyone will find the RSEEC 2016, bothtechnically interesting and with stimulating subjects and that your journey in Bucharest, Romania will
be an unforgettable and pleasant time.The Romanian National Committee of CIGRE,
Dr. Ciprian Diaconu Dr. Constantin Moldoveanu Dr. Dorin Ioan HaţeganChairman Vice-Chairman Secretary
8 9 CIGRE Regional South-East European Conference - RSEEC 2016 (3rd edition) October 10th - 12th 2016, University "Politehnica" of Bucharest, RomaniaPapers of
RSEEC 2016
Innovation for efficient
and effective management, solutions for power systems of the future!Bucharest, Romania
October, 2016
O r g a n i z e d b y :
10 11 CIGRE Regional South-East European Conference - RSEEC 2016 (3rd edition) October 10th - 12th 2016, University "Politehnica" of Bucharest, Romania #51 Criteria for oil selection suitable for use as insulating liquid in high voltage InstrumentTransformers
Dr. B. PAHLAVANPOUR
*, Mr. J. NUNES and Mr. C. WOLMARANSNYNAS AB
UK / Brazil / Sweden
SUMMARY
The use of ultra-high voltage electrical equipment in modern day transmission systems isincreasingly being used in many countries, the main drivers being safety, reliability and ease of
transport of electricity with minimum loss. This equipment is expensive and needs to be reliable andavailable at all times. Insulating liquid is used for insulation and cooling in this equipment and this
liquid plays an important role in the safe operation of these units. Insulating oil used in UHV
transmission is constantly subjected to high electrical and thermal stress, which could lead to oil and
paper deterioration. If an insulating oil continues to degrade, it starts to become less of an insulator
evidenced by an increase in Dielectric Dissipation Factor (DDF). If an oil with a low resistance to ageing is used and there is progressive production of ageing by-products, consequently, insulationdeterioration accelerates. International experience indicates that sealed CT and VTs may fail
catastrophically once DDF of the oil reaches 0.5. Further, the limits for DDF in CTs and VTs in the IEC maintenance guide IEC 60422 DDF are more stringent than for any other equipment. Baring thisin mind, oil selection for high voltage instrument transformers is an important factor and oil with high
resistance to deterioration, good electrical properties and high cooling efficiency should be used. It is
also important that such oil is able to sustain these properties during service life of these units. There
are oils available in the market being beyond the severe requirements of IEC 60296, special
applications. Such oils are used for UHV and are usually referred to as Super Grade Oil. To producesuch oil, selection of correct crude oil, refining technique and knowledge of proper use of distillates
for production of Super Grade Oil is vital. Over and above the superior ageing behaviour of these oils;
the viscosity index and high solvent power are also beneficial. Pour Point is also complemented to the
above factors and can influence performance of the oil over the life of the equipment.KEYWORDS
Insulating Oil, High-Voltage, Super-Grade
INTRODUCTION
Mineral insulating oil is used for cooling and insulation in transformers since over hundredyears ago. Specifications for supply of unused oil are published and used as a standard by both buyers
and suppliers to define their mutual obligations. When selecting a liquid for electrical insulation
purposes, information related to most of the characteristics should be obtained so that the potential
user may see the scope for possible application. Certain characteristics and property values are
inherent to the type of fluid and these should therefore only be applied to those fluids. In some cases,
prescribing a limit for a certain property is not applicable although using typical reference values for
* bruce.pahlavanpour@nynas.com 12the type and grade of the liquid in question may be necessary for design purposes. Other
characteristics are useful for identifying a material and again typical values should be quoted. Theimportant characteristics from a specification point of view are those which effect the fluid"s life and
performance. These parameters must have limits set at specification stage in order to achieve a
situation where the lifetime of the fluid within the equipment is sufficiently long. Therefore, a
standard can be divided into various sections to cover physical, chemical and electrical properties of
the oil. These properties can be classified as:Functional: properties of oil, which have impact on its function as an insulating and cooling liquid.
Refining and stability: properties of oil that are influenced by quality and type of refining and additives. Performance: properties that are related to long-term behaviour of oil in service and/or its reaction to high electrical stress, temperature and oxidation. Health, safety and environment: oil properties related to safe handling and environment protection naturally, there may be an overlap between these sections. International Electro Commission (IEC) standard IEC60296 [1] is one the most widely usedstandards for supply of oil in the electrical industry. In general, this specification defines two types of
oils as one for general purpose and second one for special application. However recent development of ultra-high voltage systems may require super grade oil, over and above requirement of oil for special application, which is not addressed in that specification.