2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
2017 Workshop on Advanced Power Equipment
(May, 14th 2017, Sunday)
50 min talk + 10 min discussion
Chair: prof. dr. Shengtao Li Co-chair: prof. dr. Yang Xu, prof. dr. Zhiyuan Liu
Location/Time Table
Topic
Speaker
9:00
Space charge distribution measurements: Prof. dr. Stéphane Holé
–
from the physical phenomena to the
Professor at University of Paris 6,
10:00
space charge or electric field distribution
Laboratory of Physics and Materials, France
10:00 –10:15 Coffee Break
Dr. Henri Bonhomme
10:15
Power Quality Technology Manager,
A pleading in favor of the capacitor
PL Capacitors and Filters, PG High Voltage
11:15
Components, s.a. ABB n.v., Belgium
Hall A:
Materials &
11:15 –11:30 Coffee Break
Electrical
Prof. dr. Zhongdong Wang
11:30
Insulation
Creepage discharges at oil-pressboard High Voltage Engineering, School of
interface in transformers
Electrical and Electronic Engineering,
12:30
The University of Manchester, UK
12:30 –14:00 Lunch Time
Prof. dr. Alun Stuart Vaughan
14:00
Nanodielectrics: From Phenomena to Professor of Dielectric Materials, Electronics
Physics
and Electrical Engineering Research Group
15:00
(Head), Southampton University, UK
Dr. Hajime Urai
9:00
Power Systems Research Department,
Switching technology in AC high-voltage
–
Center for Technology Innovation – Energy,
circuit breakers
10:00
Hitachi, Ltd. Research & Development
Group. Japan
10:00 –10:15 Coffee Break
Prof. dr. Alistair Duffy (IEEE Fellow)
10:15
Measuring complex dielectric constants at Head of Research and Innovation, Faculty of
Hall B:
high frequencies over a range of Technology, School of Engineering and
Breakers &
11:15
temperatures
Sustainable Development,
Discharging
De Montfort University, UK
Phenomena
11:15 –11:30 Coffee Break
11:30
Dr. Harry Orton
Offshore Generation Cable Connections
Orton Consulting Engineers International
12:30
Ltd. Vancouver, Canada.
12:30 –14:00 Lunch Time
14:00
Dr.Rongsheng Liu (IEEE Senior member)
Progress of Long-Distance DC Electrical
ABB AB, Corporate Research,
Power Transmission
15:00
721 78 Västerås, Sweden
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2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Prof. dr. Stéphane Holé
Stephane Holé, Professor at University of Paris 6 (Sorbonne University,
UPMC)
Laboratory of Physics and Materials (LPEM, UMR8213)
10, rue Vauquelin - 75005 Paris – France
ResaerchGate
https://www.researchgate.net/profile/Stephane_Hole
One-hour INVITED LECTURE
Title: Space charge distribution measurements: from the physical phenomena to the space charge
or electric field distribution
Author: Stéphane Holé (Sorbonne University, Paris, France and Tongji University, Shanghai, China)
Abstract: This course is divided in four parts: (i) physical, (ii) implementation and (iii) processing and
(iv) analysis. Due to its short duration, this course is limited to planar geometry with pressure-wavepropagation and pulsed-electro-acoustic methods.
In first part, starting from the physical phenomena and a priori assumptions, the signal expression
is calculated and analyzed in order to emphasize all signal sources and their relative sensitivity.
Assumptions are checked and discussed to obtain the intrinsic physical limitations of the methods.
In the second part, typical implementations (LIPP, PIPS, PEA and SEA methods) are presented and
completely analyzed in terms of excitation and signal response. The measurement conditions and
their influence on the signal are carefully discussed. Technical limitations depending on the
measurement techniques are discussed.
In the third part, various signal processing techniques are shown, from simple processing to
correct the setup bandwidth or excitation imperfections to more complex complex processing to
correct sound attenuation and dispersion, in order to calibrate the measurements.
In the last part, the impact in the signal of charges, dipoles, sample structure is discussed.
Additional measurement protocols and signal treatments are proposed to check assumptions in
order to properly analyze the signal.
Refs:
2 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Dr. Henri Bonhomme
Power Quality Technology Manager, PL Capacitors and Filters,
PG High Voltage Components, s.a. ABB n.v., Belgium
One-hour INVITED LECTURE
Title: A pleading in favor of the capacitor
Abstract: The demand for energy is increasing steeply for the future. The integration of renewables
changes the network configuration and opens a new era for various types of converters.
Performances of these converters in the past were mainly linked with the progress of the
semiconductors, but today the levels are such that passive components are becoming the key
players to make additional steps. Switching speed and used frequencies require that the
inductances of the circuits become always smaller, and the levels are so low already that the
demand for “quite perfect” capacitors is increasing significantly. Big challenges are offered to
capacitor suppliers and there is no doubt that significant progress will be made in the near future to
further improve this key component of modern converters whose design are today significantly
affected by the size and performance of the capacitors.
Refs:
3 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Prof. dr. Zhongdong Wang
Professor of High Voltage Engineering, Ferranti Building-C06
School of Electrical and Electronic Engineering, The University of Manchester
Manchester, M13 9PL
Homepage：
http://www.manchester.ac.uk/research/zhongdong.wang/personaldetails
One-hour INVITED LECTURE
Title: Creepage discharges at oil-pressboard interface in transformers
Abstract: High voltage and large power transformers are designed and manufactured using oil
immersed paper and pressboard insulation systems. Recently years see ester liquids including
natural ester and synthetic ester as substitutes for mineral oil, due to their good biodegradability
and high fire points. Thorough understandings of esters’ behaviours when combined with
pressboard insulation are essential. One of the investigations can be on creepage discharges along
the surface of pressboard in esters and their behaviours should be compared with those of mineral
oils under ac divergent electric field.
Apparent charges, current signals and images of streamer channels were obtained synchronously
to identify whether and how the introduction of pressboard surface would influence the inception
and propagation of discharges as compared to tests in open gap. When over-stressed by higher
voltages, the surface tracking along the pressboard-ester interface, triggered by sustaining creepage
discharges, was studied and the evolutions of accompanying creepage discharge patterns were
investigated.
The test results indicated that at the inception stage, the presence of pressboard or any other solid
types in different liquids under test do not influence the PD inception voltages; in the propagation
stage, solid surface tends to promote the development of discharges, especially those occurring in
negative half cycles, and shifts more discharges towards the zero-crossing phase angles. This
discharge promotion effect is much more evident in esters than in mineral oil, probably because of
higher discharge intensity in esters and higher viscosity of esters. The space charge effect and the
residual low density channel effect are proved as the mechanisms best explaining the influences of
solids on creepage discharges.
4 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Prof. dr. Alun Stuart Vaughan
ECS, University of Southampton,
Highfield, Southampton, SO17 1BJ, UK
Homepage：
http://www.ecs.soton.ac.uk/people/asv
One-hour INVITED LECTURE
Title: Nanodielectrics: From Phenomena to Physics
Abstract: Meeting the energy demands of the planet in an efficient and effective way is a key
priority of all developed and developing economies. However, “business as usual” is not an option if
we want to avoid the worst consequences of climate change and, therefore, the large centralised,
largely fossil fuel power plants of history will increasingly be replaced by greener, renewable
solutions to our energy needs. This, however, will require a new generation of power equipment,
which will often be required to operate in very different environments (e.g. offshore wind farms)
and in different ways (e.g. HVDC) to traditional solutions.
In all electrical devices, insulation plays a key role. As such, the move towards the green power
systems of tomorrow will demand much of the insulation systems they rely upon and a key aim will
be to tailor insulation such that optimal device performance occurs. For example, it has been
estimated that modest improvements in the breakdown strength, thermal conductivity and thermal
endurance of generator insulation could be sufficient to increase generator conversion efficiency by
0.2%, which would on the European scale, consequently save 1000 MW of generating capacity and
lead to associated reductions in capital investment and CO2 emissions.
The nanodielectric concept has now been with us for more than twenty years. While there is a
significant body of evidence that clearly demonstrates that the addition of nanoparticles to a matrix
polymer can lead to material systems with improved macroscopic properties, the mechanism by
which these affects come about are still debated. For example, In Lewis’ initial paper, “Nanometric
Dielectrics” *1+, he spoke in terms of the intensity of some property that varied non-monotonically
across an interface; such ideas were subsequently adapted in Tanaka’s multicore model *2+, which
gave a structural meaning to Lewis’ intensity. Elsewhere, it has been suggested that nanoparticle
interfaces can be considered as charge trapping sites and that, by affecting charge transport
dynamics, the addition of nanoparticles influences the electrical properties of the material. Finally,
it is evident that the addition of a nanofiller to a semicrystalline polymer can affect its crystallisation
behaviour and, thereby, change the morphology of the matrix, such that the overall system has
different macroscopic properties.
This presentation will consider this range of effects and critically assess the extent to which
different approaches provide a coherent explanation for the various phenomena that are observed.
A key element in this concerns the use of a range of material characterisation techniques and,
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2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
consequently, the need to connect hypothesis, practical, critical evaluation and a means of
acquiring the pertinent data will be stressed.
Refs:
1. T.J.Lewis, “Nanometric Dielectrics”, IEEE TDEI, vol. 1, pp. 812-825, 1994.
2. T.Tanaka, M.Kozako, N.Fuse, Y.Ohki, “Proposal of a Multi-core Model for Polymer Nanocomposite
Dielectrics”, IEEE TDEI, vol. 12, pp. 669-681, 2005.
6 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Dr. Hajime Urai
Unit Leader, Senior Researcher, Power System Research Department,
Center for Technology Innovation – Energy, Hitachi,Ltd. Research &
Development Group
Kokubu-cho 1-1-1, Hitachi-shi, Ibaraki-ken, 316-8501, Japan
One-hour INVITED LECTURE
Title: Switching technology in AC high-voltage circuit breakers
Abstract: Basic switching phenomena in power transmission and distribution system are presented
and some interrupting duties are introduced. Related to the duties, interrupting phenomena are
explained with some examples of simulation and measurement technique.
7 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Prof. dr. Alistair Duffy
Professor of Electromagnetics, Associate Dean of Research and Innovation,
School of Engineering and Sustainable Development,
De Montfort University, UK
Researchgate：
https://www.researchgate.net/profile/Alistair_Duffy
One-hour INVITED LECTURE
Title: Measuring complex dielectric constants at high frequencies over a range of temperatures
Abstract: In power systems, changes in dielectric behaviour as a function of temperature and
frequency may have a bearing on the transmission of electromagnetic impulse phenomena such as
partial discharge, lightning or man-made pulses. Such variations may also bring uncertainty into
analysis by, for example, changing the parameters for analysis techniques such as reverse
time-stepping. This presentation addresses testing how dielectrics behave at a range of
temperatures and over a range of frequencies. The method is based on an existing ASTM standard
but the investigations include the use of full wave electromagnetic simulation to analyse the
tolerances within the measurement system as well as practical tests using a temperature controlled
oven to address the effect of elevated temperatures.
Refs:
8 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Dr. Harry Orton
Orton Consulting Engineers International Ltd.
Vancouver, Canada
2005 ICC Distinguished Service Award
One-hour INVITED LECTURE
Title: Offshore Generation Cable Connections
Abstract:
9 / 10
2017 ICEMPE, Workshop on Advanced Power Equipment,
Xi’an Jiaotong University (XJTU), Xi’an, P. R. China
Dr. Rongsheng Liu
Senior Member IEEE;
ABB Veteran, ABB AB, Corporate Research,
721 78 Västerås, Sweden
One-hour INVITED LECTURE
Title: Progress of Long-Distance DC Electrical Power Transmission
Abstract: Transmission and/or distribution systems are needed to transport electrical power from
its generation site to the user locations. High voltage direct current (HVDC) technology is favored in
a long distance electrical power transmission because it reduces electrical losses and costs in
comparison with high voltage alternating current (HVAC) technology after the transmission distance
is longer than a break-even distance.
This presentation reviews major DC power transmission technologies, concentrating on systems
that are capable of long-distance electrical power transmission. Advantages and disadvantages of
different transmission systems are compared and analyzed. Special attention is paid to the safe use
of DC insulation systems [1].
Major electrical power transmission systems may consist of overhead lines, extruded cables,
mass-impregnated cables, oil-filled cables, gas insulated lines, and superconducting cables.
Converter stations are needed in a long-distance DC electrical power transmission system. Today,
there are two main technologies. They are named HVDC Light on the basis of insulated-gate bipolar
transistors (IGBTs), and HVDC Classic with the use of converter transformers, respectively. With the
use of HVDC Light technology, electrical power transmission up to the capacity of 3,000 MW is
feasible. With the use of HVDC Classic technology, long-distance electrical power transmission up to
the capacity of 12 gigawatts is feasible [2]
Refs:
*1+ Rongsheng Liu, “Long-Distance DC Electrical Power Transmission”, IEEE Electrical Insulation
Magazine, Vol. 29, No. 5, pp. 37-46, 2013.
[2+ Mats Berglund, Markus Pettersson, Thomas Freyhult, and Raul Montano, “Developments in
UHVDC and UHVAC Transmission”, Conference of Electric Power Supply Industry (CEPSI), Bangkok,
October 2016.
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