Download 1. Publications in Peer-Reviewed Journals (with impact factor)

Publication List
Constantinos D. Halevidis
[email protected]
1.
Publications in Peer-Reviewed Journals (with impact factor)
1.1.
Halevidis C.D., Anagnostatos S.D., Polykrati A.D., Koufakis E.I., Bourkas P.D., Proposal of a
protection method against probable consequences to humans and the environment from shortcircuit or abruption of a low-voltage distribution line conductor, Generation, Transmission &
Distribution, IET, 4 (2010) 793-800.
Abstract: The maximum length of a low voltage distribution line (400 V) is determined by the
transformer power, the type and cross section of the conductors as well as the nominal current of
the fuse. Meeting this requirement fulfills the neutralization condition. A low voltage
distribution network bare conductor being abrupted can cause deadly electrocution to a person
or start up a fire. Relative foresight is needed in altering the regulations, so as to exclude the
fore mentioned consequences to humans and the environment. A protection method is
comprised of a system utilizing the Global System for Mobile communications (GSM) placed
on the last pole of each line which is activated when a line is cut off and powers down the
circuit through means of an automatic circuit breaker installed upon the low voltage distribution
panel.
Third-party citations:
1.1.1. Koustellis, J.D., Polykrati, A.D., Katsanis, J.S., Halaris, P.G., Bourkas, P.D., Protective
measures against electrical hazards of consumer installations, (2011) Proceedings of
the IASTED International Conference on Power and Energy Systems EuroPES 2011,
277-279.
Journal impact factor: 1,307
1.2.
Halevidis C.D., Anagnostatos S.D., Polykrati A.D., Koufakis E.I., Bourkas P.D., Abruption
cross-section and bending change of ACSR energy lines in fire environment, Advances in
Mechanical Engineering, (2010), doi: 10.1155/2010/291630
Abstract: An ACSR (Aluminum Conductors Steel Reinforced) power line, when it lies in a fire
environment, can manifest a permanent elongation and change in bending, as when the
conductors attain a temperature of over 500 οC, a drastic fall of the mechanical strength of the
steel core is caused. This work is a study about the conductor cross-section at the position of the
abruption, in case it occurs. This cross section appears to be approximately 62.5% of the
original value. Subsequently, two approximative methods of calculating the bending change of
overhead lines are shown.
Journal impact factor: 0,500
1.3.
Proios A.N., Halevidis C.D., Koufakis E.I., Bourkas P.D., Magnetic-Field Measurements Near
Two-Pole-Type Distribution Substations, Power Delivery, IEEE Transactions on, 26 (2011)
1137-1144.
Abstract: This paper presents the mean values of the resultant magnetic field in the low
frequency range, which were recorded during spring and summer near two-pole-type
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distribution substations in urban areas. The mitigation of the magnetic field that was achieved
after covering the LV fuse boxes with thin aluminum plates is also presented. The mean
attenuation achieved is approximately 23% during spring and 18% during summer at the region
of up to 30 cm from the substations and at a height of 1.0 m from the ground, at the measuring
points near the LV fuse boxes. All the measured magnetic field values that were observed were
lower in comparison with those specified as limits and introduced by ICNIRP.
Third-party citations:
1.3.1. Okun, O., Shevchenko, S., Korpinen, L., A comparison of magnetic fields inside and
outside high-voltage urban 110-kv power substations with the exposure
recommendations of the ukrainian regulatory authorities, Radiation Protection
Dosimetry, 154 (2013), 417-429.
Journal impact factor: 1,657
1.4.
Anagnostatos S.D., Halevidis C.D., Polykrati A.D., Koufakis E.I., Bourkas P.D., High-Voltage
Lines in Fire Environment, Power Delivery, IEEE Transactions on, 26 (2011) 2053-2054.
Abstract: This work concerns the change in bending which can manifest in a high voltage line,
when it lies in a fire environment. It is shown that in the case where ACSR conductors
(Aluminum Conductors Steel Reinforced) attain a temperature of over 500 oC, a drastic fall of
the steel core mechanical strength is caused, resulting in permanent elongation of the line which
decreases drastically the clearance from the underlying vegetation.
Journal impact factor: 1,657
1.5.
Koustellis J.D., Anagnostatos S.D., Halevidis C.D., Karagrigoriou F.S., Polykrati A.D., Bourkas
P.D., Contact of heavy vehicles with overhead power lines, Safety Science, 49 (2011) 951-955.
Abstract: Contact with overhead power lines is regarded worldwide as one of the leading causes
of electrical fatalities. The analysis carried out in this paper refers to a real accident that
occurred in Greece a few years ago, involving the contact of a heavy vehicle (concrete pump)
with the medium voltage lines of the national distribution network. For a better understanding of
the incident, a description of how the protection system of medium voltage distribution lines
works when a fault occurs is given. Furthermore, emphasis has been laid on possible ways to
avoid similar accidents in the future.
Third-party citations:
1.5.1. Chi C., Lin Y., Ikhwan M., Flow diagram analysis of electrical fatalities in
construction industry Safety Science, 50 (2012) 1205-1214.
1.5.2. Bas, E., An integrated quality function deployment and capital budgeting methodology
for occupational safety and health as a systems thinking approach: The case of the
construction industry, Accident Analysis and Prevention, 68 (2014), 68, 42-56.
1.5.3. Gürcanli, G.E., Müngen, U., Analysis of construction accidents in Turkey and
responsible parties, Industrial Health, 51 (2013), 581-595.
Journal impact factor: 1,672
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1.6.
Halevidis C.D., Wooden pole ladder network model development and verification using finite
element analysis, European Transactions on Electrical Power, 23 (2013) 62-71. doi:
10.1002/etep.643.
Abstract: In this article, a new resistive ladder network, describing the electrical behavior of the
wooden pole, cross arm, and their interconnection, is developed. The network is developed and
verified using the results of the finite element analysis of the construction. Good agreement was
achieved between the two analyses. In addition, several pole–cross arm topologies were studied,
and the effect of the different elements on the total resistance of the construction was quantified.
Characteristically, it was found that the use of a steel cross arm instead of a wooden one
decreases drastically the total resistance. Also, the use of a steel cross arm brace can reduce the
total resistance by up to 37.4%.
Journal impact factor: 0,631
1.7.
Koufakis E.I., Halevidis C.D., Polykrati A.D., Tsarabaris P.T., Calculation of the Activation
Energy of Oil-Paper Insulation in a Distribution Transformer, Electrical Insulation Magazine,
28 (2012) 52-58.
Abstract: Transformers are key points of power networks. Preventive diagnosis and
maintenance of transformers are necessary in order to improve the reliability of power systems.
An extensive research has led to the development of various methods used to diagnose the
condition of their insulation. In some of these methods the activation energy of the insulating
materials is the determinant factor. This paper primarily presents measurements of insulating
resistance in distribution transformers, at various temperatures, and there after the calculations
of the activation energy of their oil-paper insulating system. Observations and comments on the
behavior of the transformer insulating system are made.
Third-party citations:
1.7.1. Baral, A; Chakravorti, S., Prediction of moisture present in cellulosic part of power
transformer insulation using transfer function of modified debye model, Dielectrics and
Electrical Insulation, IEEE Transactions on, 21 (2014) 1368-1375.
Journal impact factor: 1,61
1.8.
Halevidis C.D., Bourkas P.D., Karagiannopoulos C.G., Thermal Effect of the Recloser
Operation Cycle on Bare Overhead Conductors, Power Delivery, IEEE Transactions on, 27
(2012) 568-574.
Abstract: A new calculation method of the temperature rise generated from multiple
(consecutive) short circuits, to which bare overhead conductors are subjected, is proposed in this
paper. Multiple short circuits are common in medium-voltage lines protected by reclosers due to
their operation cycle. The proposed method treats each short circuit as a separate event. In
addition, the cooling between each short circuit is taken into account. The results of the
proposed method are compared to the results given by the method of the IEC 60865-1 standard.
The application of the proposed method results in greater temperature rises when the equivalent
thermal current density is greater than a threshold. Furthermore, alterations to the recloser
operation cycle are performed in order to investigate its effect on the generated temperature rise,
namely, alterations to the reclosing interval between successive tripping operations and the ratio
of fast to delayed trips. Finally, the proposed method was compared to an exact numerical
solution of the heating process.
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Third-party citations:
1.8.1. Wiecek, B., De Mey, G., Chatziathanasiou, V., Papagiannakis, A., Theodosoglou, I.,
Harmonic analysis of dynamic thermal problems in high voltage overhead
transmission lines and buried cables, International Journal of Electrical Power and
Energy Systems, 58 (2014), 199-205.
Journal impact factor: 1,657
1.9.
Halevidis C.D., Koustellis J.D., Polykrati A.D., Bourkas P.D., Exposure of workers to ELF
magnetic fields during the temperature-rise test of electrotechnical equipment, Measurement, 45
(2012) 1960-1965.
Abstract: In this paper, extremely low frequency (ELF) magnetic fields (MFs) were measured
during the temperature-rise test of various electrotechnical equipment. The number of workers
subjected to magnetic fields from the temperature-rise test is small; however, the exposure can
be significant as the testing currents can be in the order of hundreds amperes. The resultant
magnetic field during testing can exceed the ICNIRP limits for occupational exposure. The
magnetic field exposure was recorded and statistical measures were extracted for three
electrotechnical apparatus. It was found that the Time-Weighted Average exposure per unit
current can reach 0.0598 lT/A. Additionally, in order to mitigate the exposure, a rule of thumb
regarding safety distances has been proposed. It is shown that the use of this rule of thumb can
reduce the magnetic field exposure.
Third-party citations:
1.9.1. Churlaud O., Hemette S., Liu Υ., Oger C., Yang X., PE 103: Création d’un outil d’aide
à la mesure des champs magnétiques de basse fréquence, Project report, (2013).
Journal impact factor: 1,526
1.10. Halevidis C.D., Koufakis E.I., Power Flow in PME Distribution Systems during an Open
Neutral Condition, Power Systems, IEEE Transactions on, 28 (2013) 1083-1092.
Abstract: The open neutral condition, in distribution networks, can cause significant damage to
customer installations. Due to this, the continuity of the neutral conductor is important to the
power utilities. In this paper, a power flow algorithm for three-phase four-wire distribution
networks with protective multiple earthing (PME), during an open neutral condition, is
presented. This algorithm is based on a modified backwards-forwards technique. Additionally,
the return current flow is explicitly modeled. Results from three different distribution feeders
with different load unbalance and topology are presented and discussed. Furthermore, the
effects of the grounding resistances, the load model (constant admittance or constant power),
and the neutral breakage point (abruption point) on the voltage levels, are investigated.
Journal impact factor: 3,53
1.11. Koustellis J.D., Halevidis C.D., Polykrati A.D., Bourkas P.D., Analysis of a Fatal Electrical
Injury due to Improper Switch Operation, Safety Science, 53 (2013) 226-232.
Abstract: Electrical accidents are significant causes of occupational fatalities in the world. The
analysis carried out in this paper refers to a real accident that occurred in Greece during the
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repair work carried out on a medium voltage transformer of the Public Power Corporation
(PPC). While attempting to restore the electrical power, the electrician climbed the pylon where
the transformer was placed and tried to change the single pole fuse. The insulator of the phase
broke, resulting in the release of the power distribution wire. The technician came into contact
with the loose wire with his lower limb and suffered an electric shock. For a better
understanding of the incident, a description of the distribution network is given. Furthermore,
emphasis has been laid on possible ways to avoid similar accidents in the future.
Journal impact factor: 1,672
1.12. Anagnostatos S.D., Halevidis C.D., Polykrati A.D., Bourkas P.D., Karagiannopoulos C.G.,
Examination of the 2006 blackout in Kefallonia Island, Greece, International Journal on
Electrical Power and Energy Systems, 48 (2013) 122-127.
Abstract: The blackout on the Greek island of Kefallonia on January 24th 2006 was caused by
the fall of 10 towers of the 150 kV power transmission network due to high winds and heavy
snowfall. These extreme meteorological phenomena were unprecedented on the island and thus
had not been taken into consideration by the Greek installation and maintenance regulations
regarding these towers. Due to changes in meteorological conditions in recent years, the above
regulations have to be revised so as to propose smaller distances between towers in new
transmission lines and improvements to the existing lines to endure severe weather conditions
when necessary. This paper provides a short description of the High Voltage (HV) network of
the island of Kefallonia, the system conditions before and after the blackout, and identifies the
causes of the blackout. In addition, the mechanical strength evaluation of the simple circuit
towers (similar type to those that collapsed) is made under the stress of gale-force winds
combined with the ice-coating of conductors. Finally, in order to avoid the repetition of such an
outage, several methods are proposed.
Journal impact factor: 2,694
1.13. G. K. Soulinaris, C. D. Halevidis, A. D. Polykrati, P. D. Bourkas, Evaluation of the thermal
stresses and dielectric phenomena in the investigation of the causes of wildfires involving
distribution power lines, Electric Power Systems Research, 117 (2014) 76-83..
Abstract: In this paper, the thermal stresses and dielectric phenomena of distribution power lines
are evaluated in order to ascertain whether the line was the cause or the victim of a wildfire. The
thermal stresses, to which distribution overhead lines are subjected, due to the line current,
short-circuits, or due to the wildfire are calculated. Furthermore, the various dielectric
phenomena of distribution lines are presented and their ability to start a wildfire is examined.
Moreover, experiments concerning aspects of wildfire forensics were undertaken. During these
experiments, the ability of ejected incandescent aluminum molten particles to cause a wildfire
was investigated. Finally, a case study of a real incident, in which a medium voltage overhead
line was blamed for a wildfire, is examined. The aim of this work is to assist in the formation of
guidelines which can be used in the investigation of the causes of a wildfire involving
distribution power lines.
Journal impact factor: 1,595
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2.
Publications in Peer-Reviewed Journals (without impact factor)
2.1.
Halevidis C.D., Koufakis E.I., Bourkas P.D., Protective media in low voltage lines, Electrical
Technical Review, 242 (2012) 18-23. (in Greek).
Abstract: In this paper, the effect of an open neutral conductor on low voltage (LV) distribution
lines with TN-C-S Protective Multiple Earthing (PME) and TT earthing systems is investigated.
The effect of load unbalance is studied, and more specifically the effect of the relative phase
loading, the load power factor, the earthing impedance etc. From the results of the theoretical
analysis and the simulation of the transient phenomena during the interruption of the neutral, it
can be seen that the Neutral-Earth Voltage (NEV) can reach dangerous levels and that the loads
are subjected to voltage swells or dips. A detection method is proposed, so as to detect an open
neutral condition. This method consists of the detection of the voltage swell in the least loaded
phase, caused by the open neutral, and the subsequent cut off of the installation.
3.
Peer-Reviewed Articles in International Conference Proceedings
3.1.
Halevidis C.D., Anagnostatos S.D., Koufakis E.I., Polykrati A.D., Bourkas P.D., Causes and
Consequences of sparks on the Surface of Insulators of Middle Voltage Lines, in Proc. of
INTERFLAM, Nottingham, 2010, pp. 1641-1646.
Abstract: The motive of this work was a real incident of fire, which was attributed to sparks and
partial discharges of a medium voltage line of the distribution network. This work investigates
the causes and consequences of sparks of the medium voltage lines under normal operation
conditions as well as under a fire incident. This work presents the occurrence of sparks and
partial discharges on insulators and the conditions under which they take place. Furthermore,
analytical calculations are given concerning the minimum electrical strength for the initiation of
partial discharges on bare conductors of the medium voltage lines as well as for the required
insulating ability. From the calculations, the case of the fire caused due to the medium voltage
line is examined.
3.2.
Halevidis C.D., Koufakis E.I., Anagnostatos S.D., Polykrati A.D., Short-circuit and overheating
test of stationary electric contacts, in Proc. of DEMSEE 2010, Sitia, 2010.
Abstract: In this work overheating and short-circuit tests are performed on low voltage
stationary electric contacts, namely power sockets. From these tests, the real nominal current of
the sockets is ascertained. The results show that three out of eight test subjects failed the
overheating test and two out of eight failed the short-circuit test.
3.3.
Koufakis E.I., Halevidis C.D., Anagnostatos S.D., Polykrati A.D., Breakdown strength
measurements of insulating oils under elevated temperature and shake up, in Proc. of DEMSEE
2010, Sitia, 2010.
Abstract: In this work, the breakdown strength of insulating oil was measured in room
temperature, after shaking up, and after shaking up and heating to 40 oC. The results show that
the shakeup decreases the insulating strength and that the heating up reverses the results of the
shakeup. In some cases, the heating up increases the insulating strength to values greater than
the initial ones (without shaking up). This can be explained using the electro-convection theory
and the destruction of the conducting bridges consisting of floating particles.
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3.4.
Anagnostatos S.D., Halevidis C.D., Polykrati A.D., Koufakis E.I., Bourkas P.D., Partial
Discharges on Bakelite Insulators under Impulse Voltage, in Proc. of DEMSEE 2010, Sitia,
2010.
Abstract: Partial discharges are a major aging factor of insulators. In this work, measurements
are carried out on bakelite insulators under impulse voltage of 1.2/50 μs form, in order to
examine the partial discharges occurring on them. The measurements show that partial
discharges occur due to impact ionization. Also, the measurements show that apart from the
consumption due to partial discharges, a part of the offered energy from the impact ionization is
consumed on the insulator due to mechanical stress.
3.5.
Halevidis C.D., Koufakis E.I., Anagnostatos S.D., Polykrati A.D., Temperature increase of
middle voltage network conductors due to the three operation cycles of reclosers, in Proc. of
DEMSEE 2010, Sitia, 2010.
Abstract: In this work, the temperature rise of ACSR conductors concerning medium voltage
networks is calculated due to the operation cycles of reclosers during a case of fault. The
increased resistance of the conductor at the second and third cycle is taken into consideration.
This increased resistance has consequently a greater temperature increase compared to the one
of the first cycle. From the calculations, it is concluded that the temperature rise is particularly
great in the first kilometers of the line, as the total fault resistance is small.
3.6.
Halevidis C.D., Polykrati A.D., Karagianopoulos C.G., Bourkas P.D., Protection from the
Abruption of the Concentric Cable, in Proc. of EuroPES 2011, Crete, 2011, pp. 280-283.
Abstract: In this work, a real event in which a person suffered lethal electrocution from the
concentric supply cable is investigated. Specifically, the abruption causes are identified. From
the calculation results, it can be concluded that cable abruption is possible due to a direct
lightning stroke and its resulting temperature rise from the current and the insulation ignition.
Additionally, a protection method against the abruption of the supply cable is proposed, utilizing
the PSTN (Public Switched Telephone Network) technology.
3.7
Halevidis C.D., Karagianopoulos C.G., Bourkas P.D., Causes of Conductor Abruption during
Normal Weather Conditions, in Proc. of EuroPES 2011, Crete, 2011, pp. 284-288.
Abstract: In this paper, an investigation of a real event, in which a fire was started due to a low
voltage line aluminum conductor being abrupted, is undertaken. The conductor was
asymmetrically dented at the abruption point. From the performed calculations, it can be
concluded that an abruption cannot be caused by sparking. On the other hand, an abruption can
be caused by mechanical stress by shot pellets from a hunting rifle.
3.8.
Polykrati A.D., Halevidis C.D., Psarros E.G., Koufakis E.I., Bourkas P.D., Causes of the
Melting Image of a Conductor of Low Voltage Power Line Network, in Proc. of EuroPES 2011,
Crete, 2011, pp. 289-291.
Abstract: The image of a conductor of low voltage power lines at melting point could be the
result of a fire or of a short circuit in the case that the protection condition is not properly met.
Its image could not be attributed to the ionization phenomenon as this does not occur in low
voltage power lines. Also, when the short circuit condition is satisfied in low voltage power
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lines, then a short circuit causes the almost immediate blowing of the fuses. As a result, the
conductors are protected from overheating and sparks or metal particles are not created.
3.9.
Mouzakitis P.I., Halevidis C.D., Soulinaris G.K., Koustellis J.D., Koufakis E.I., Feasibility of
Fire Ignition from Molten Particles of Electrical Appliances, in Proc. of EuroPES 2011, Crete,
2011, pp. 292-295.
Abstract: A glowing contact can generate metal or electrical insulation material particles which
can possibly cause a fire. This paper examines the case of the generation of such particles from
the energy saving switch of a hotel room (printed circuit board operated with a card key for the
supply of the electric loads of a room except the refrigerator).
3.10. Soulinaris G.K., Halevidis C.D., Karagrigoriou F. S., Halaris P.G., Bourkas P.D., Partial
Discharges Measurements on Coated and non-Coated Solid Dielectric in Air, in Proc. of
EuroPES 2011, Crete, 2011, pp. 448-451.
Abstract: In this work, high voltage pulses of the form 1.2/50μs were applied on a metal tip solid dielectric - metal plate combination in the air using coated and non coated specimens in
order to investigate the reduction of partial discharges. The measurements indicated the effect of
the coating, as it reduces the partial discharges on the dielectric.
3.11. Halevidis C.D., Mouzakitis P.I., Polykrati A.D., Bourkas P.D., The effect of the fuse enclosure
temperature rise on overhead conductor protection, in MED POWER 2014 - 9th Mediterranean
Conference on Power Generation, Transmission, Distribution and Energy Conversion, 2014,
Athens, accepted for publication.
Abstract: This work examines aspects of low voltage distribution line protection through fuses.
More specifically, the effect of the increased ambient temperature inside a fuse-box, due to joule
losses, on the current rating of the fuses is examined in conjunction with the ampacity of the
overhead conductors. The temperature rise of the fuse-box is calculated according to IEC 60890
with some improvements so as to cope with external installation of the switchboard, i.e. the heat
gain due to solar irradiance. Finally, whether the protection offered by the fuses is sufficient, is
examined, as fuse operation at high ambient temperatures causes a shift of the time current
curve towards shorter times. Through this work, the exact relation between conductor ampacity
and fuse rating can be ascertained, thus enabling protection engineers to identify any possible
cases of conductor over-loading, under-utilization, or nuisance tripping of the feeder.
3.12. Mouzakitis P.I., Dimitriadou D.D., Halevidis C.D., Polykrati A.D., Bourkas P.D., Study of the
fall of molten copper and aluminum beads in interior places, in MED POWER 2014 - 9th
Mediterranean Conference on Power Generation, Transmission, Distribution and Energy
Conversion, 2014, Athens, accepted for publication.
Abstract: Whether the molten particles caused the fire or if they were created from the fire has
not been given a unanimous answer. This work examines the fall of molten copper and
aluminum beads created by an electrical-electronic device in interior places. The temperature of
the molten particle is in many cases greater than the spontaneous ignition temperature of certain
materials. In this paper the temperature profile of a variety of copper and aluminum beads is
studied as the beads fall to the ground after being ejected due to high temperature. The study
Page 8 of 11
refers to accidents in houses and industries so the wind is considered to be zero and the ambient
temperature constant.
3.13. Dimitriadou D.D., Athanasiadis T., Mouzakitis P.I., Halevidis C.D., Polykrati A.D., Thermal
stress of bolted connectors used in medium voltage lines, in MED POWER 2014 - 9th
Mediterranean Conference on Power Generation, Transmission, Distribution and Energy
Conversion, 2014, Athens, accepted for publication.
Abstract: This paper studies the thermal behavior of bolted connectors used in conjunction with
ACSR conductors in the overhead medium voltage network. Namely, the thermal behavior of
these bolted connectors is examined in relation with the tightening torque under ac current.
These connectors were subjected to repeated thermal cycling, in order to ascertain whether the
tightening was reduced. It was found that if the connector was correctly tightened, the torque
(and thus the contact) was unaffected by the thermal cycling. On the other hand, the thermal
cycling caused initially loose connections to worsen even more.
4.
Peer-Reviewed Articles in Greek Conference Proceedings
4.1.
Halevidis C.D., Bourkas P.D., Protection against probable consequences to humans and the
environment from the abruption of a distribution conductor, in Proc. of Ikarian Studies Conf.,
Ikaria, 2010. (in Greek)
Abstract: The abruption of a bare low voltage conductor can cause a fatal electrocution, or a
wildfire. Relevant measures must be foreseen in regulations, so as to avoid the aforementioned
adverse consequences. A protection method is the activation of GSM system installed on the last
pole of the line due to the conductor abruption. The system, when activated, will open the line
circuit breaker ruling out any adverse effect.
4.2.
Bourkas P.D., Halevidis C.D., Koufakis E.I., Protective media for consumer installations against
neutral abruption and voltage unbalances, in Proc. of Ikarian Studies Conf., Ikaria, 2010. (in
Greek)
Abstract: Consumer installations must be equipped with a protective medium against the
abruption of the neutral conductor. This medium can be a undervoltage and overvoltage relay
which will isolate the installation in case of neutral conductor abruption, as well as voltage
unbalances outside the permissible limit of 230+10% V.
4.3.
Halevidis C.D., Koufakis E.I., Bourkas P.D., Protection method against probable consequences
due to voltage imbalances or conductor abruption (phase or neutral) in low voltage lines, in
Proc. of CIGRE Athens 2011, Athens, 2011. (in Greek).
Abstract: In this paper, the effect of an open neutral conductor on low voltage (LV) distribution
lines with TN-C-S Protective Multiple Earthing (PME) and TT earthing systems is investigated.
The effect of load unbalance is studied, and more specifically the effect of the relative phase
loading, the load power factor, the earthing impedance etc. From the results of the theoretical
analysis and the simulation of the transient phenomena during the interruption of the neutral, it
can be seen that the Neutral-Earth Voltage (NEV) can reach dangerous levels and that the loads
are subjected to voltage swells or dips. A detection method is proposed, so as to detect an open
neutral condition. This method consists of the detection of the voltage swell in the least loaded
phase, caused by the open neutral, and the subsequent cut off of the installation.
Page 9 of 11
5.
Books / Chapters in Books
5.1.
Halevidis C.D., Polykrati A.D., Tsarabaris P.T., Theodorou N.J., Notes for the Electrical
Measurements Laboratory, 2011, National Technical University Press. (in Greek).
5.2.
Halevidis C.D., Polykrati A.D., Bourkas P.D., Electrical and Mechanical Design, 2011, National
Technical University Press. (in Greek).
5.3.
Halevidis C.D., Bourkas P.D., Electrical Forensic Reports, 2012, National Technical University
Press. (in Greek).
Page 10 of 11
6. Publication Table
Publication type
Publications in PeerReviewed Journals
(with impact factor)
Publications in PeerReviewed Journals
(without impact factor)
Articles in interantional
conference proceedings
with peer-review
Articles in Greek
conference proceedings
Publications
1st author
2nd author
3rd author
13
6
6
1
1
1
13
6
5
1
3
2
1
Table 1: Publication analysis
Journal
Impact factor
Publications
IET Generation Transmission Distribution
1,307
1
Power Delivery, IEEE Transactions on
1,657
3
Safety Science
1,672
2
European Transaction on Electrical Power
0,631
1
Electrical Insulation Magazine
1,61
1
Measurement
1,526
1
Power Systems, IEEE Transactions on
3,53
1
International Journal on Electrical Power
2,694
1
and Energy Systems
Electric Power System Research
1,595
1
Advances in Mechanical Engineering
0,500
1
Total
Table 2: Journal impact factors
Total
1,307
4,971
3,344
0,631
1,61
1,526
3,53
2,694
1,595
0,500
21,708
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