Dr
Edson Guedes Costa
(Federal University of Campina Grande)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
Polymeric insulators are largely used in electrical systems. However, these equipment still present serious problems, mainly related to their polymeric material layer. When the polymer is exposed to intense electric fields, insulation failure and loss of hydrophobicity may occur.
These problems are caused due to non-uniform electric field distribution along the insulator, which tends to...
Mr
Yang Xu
(Tsinghua University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
Objective: Oil-paper insulation is widely used in transformer bushings and current transformers, and the detection of partial discharge (PD) in this type of insulation has been paid attention. However, current methods for PD detection in these apparatus usually do not have satisfying performance in either sensitivity or noise rejection capacity. In this paper, an advanced method for PD...
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
The performance data of high voltage resistors in specific pulsed power applications is limited. A series of tests were performed on epoxy coated high voltage ceramic composite resistors. With the implementation of these resistors in unique applications that result in their exposure to high energy surge environments such as air conditioners and electric vehicles, there is a need for a better...
Dr
A. J. Reid
(Glasgow Caledonian University),
M. Azizian Fard
(Glasgow Caledonian University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
This paper presents an investigation of the influence of different operating conditions of HVDC convertors on partial discharge behavior occurring within cables on the DC side of an HVDC system. Cables at the DC side undergo different stresses due to transients and harmonics, which affect their insulation integrity and may result in an intensified level of partial discharge (PD) activity. Most...
Koviljka Stankovic
(University of Belgrade)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
Isolation capability of organic and inorganic isolation materials is considerably different in respect to time. There is a relatively poor dependence on time in case of inorganic isolation materials. It is very significant in case of organic materials (that are more often in use). This paper will consider life expectancy of form-wound coil isolation of high-voltage motor depending on the part...
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
The negative high-voltage switching voltage impulse with long wavefront time was employed to conduct lightning strike discharge simulation testing research on shielding-protection characteristic of lightning rod. In order to simulate the leader attachment and the protection process of lightning rod, the rod to rod discharge electrode arrangement was applied, the upper rod electrode was used to...
Mr
Sebastian Wetzeler
(RWTH Aachen, Institut for High Voltage Technology)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
Circuit breakers are important components in the electrical power supply grid. The maintenance of high voltage gas circuit breakers requires high personal as well as monetary efforts for the asset operator. Furthermore, a faulty reassembly of the circuit breaker during maintenance can lead to a circuit breaker failure during operation. For this reason the maintenance strategy changed from a...
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
The purpose of this paper is the identification and classification of different sources of partial discharge (PD). These PD sources are due to artificially introducing defects, which are carefully designed in the power cable insulation. PD data is collected from the experimental work in high voltage laboratory with the aid of a conventional phase-resolved PD analyzer LDD-6. After that, the...
Prof.
Pietro Romano
(Palermo University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
In recent years, the increasing use of AC-DC converters, especially in the field of renewable energy sources, has led to the implementation of new modulation techniques, in particular the ones based on the pulse width modulation, PWM. The purpose of the present work is to evaluate the presence of partial discharges that occur when the supply is a PWM stress-type. In particular the goal is to...
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
The arc quenching device with multi-short-gaps introduced in this paper has the advantages such as quick and reliable action, good performance of self-restoration in insulation and low cost. The device allows the arc to be established by a lightning strike, and then the device extend arc with the high temperature and high pressure produced by arc until arc extinguishes. The duration of the arc...
Dr
Xianjun Shao
(Research Institute of State Grid Zhejiang Electric Power Company; State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
ABSTRACT: Multiple PD sources may occur simultaneously in power equipment, and cause the interpretation problems such as pattern recognition and risk assessment. The separation of mixed signals is of importance for reliable interpretation. The separation features in most of the methods are with fixed mathematical equations, which may not applicable to the variable experimental conditions such...
Dr
XILIN WANG
(Graduate School at Shenzhen, Tsinghua University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
RTV coatings and composite insulators had been widely used in electric insulations to prevent pollution flashover. Many methods of materials analysis were used to get more information about the content, the elements components, and the structures such as IR spectrum, XPS, EDS and XRD.
Laser-induced breakdown spectroscopy (LIBS) was an effective technique, unlike other conventional surface...
Tobin Knautz
(Goethe-Universität Frankfurt)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
The purpose of this study is to investigate temperature profiles of electric arc discharges in a medium-voltage switchgear. This project aims at Validation of simulations of electric arc discharges temperatures. Therefore a simple contact geometry was applied under 150 A and 550 A of alternating current at normal atmosphere. The contacts were made up of both copper and copper-wolfram.
To...
Prof.
Xingming Bian
(North China Electric Power University)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
In recent years, with the deterioration of nature climatic, haze occurred frequently in Beiijng, China, especially in spring and winter seasons. During haze weather, the concentration of airborne particulate matter will turn higher, and it may have significant effects on high voltage power systems.
When the electric field intensity on the surface of the HVDC conductors exceeds a critical...
Junhao Li
(Prof.)
08/07/2016, 13:30
High Voltage Design, Devices, Testing, and Diagnostics
Poster Presentation
Gas insulated switchgear (GIS) is the most important equipment in grid. It has been widely used in power system for the merits of small size and high reliability. Especially for the city substation, GIS is the preferred power equipment. GIS has the compact structure and it is difficult to repair once there are defects inside the GIS. It is the important step to monitor the defects inside GIS....
