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Cameron Harjes (University of New Mexico)04/06/2018, 13:30Power Electronics, Power Supplies, Prime Power, Rotating Machines, and Energy ConvertersPoster Presentation
Laboratory equipment is sometimes required to be calibrated in-situo and, in those scenarios, a pulse with frequency content exceeding the intended voltage source is needed. Moreover, for sensors that are highly attenuated, the calibration pulser must also be high voltage and very reproducible. Because the calibration pulser is intended to be used across a wide variety of experiments, it has...
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Mr Xiaojun Liu04/06/2018, 13:30Poster Presentation
As DC distribution system is developing rapidly, DC series arc fault has become a severe threat to safe operation of DC systems, since DC arc cannot extinct by itself. Moreover, DC series arc fault is difficult to be located, as the high frequency components of the arc current that are superimposed on the normal DC current cannot be extracted in some cases.
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In this paper, a DC series arc fault... -
Dr Andrews Heather (Los Alamos National Lab)04/06/2018, 13:30Poster Presentation
Insulator surface flashover in vacuum due to pulsed and DC voltages has been thoroughly investigated, however the characteristics of surface flashover under multiple, short duration, high-voltage pulses are not well understood. A test stand has been developed at Los Alamos National Lab to further understand the effects of these conditions on the surface flashover strength of various...
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Mrs Yicen Hou (Tsinghua University)04/06/2018, 13:30Poster Presentation
Charges accumulated on the dielectric surface under DC field can lead to the overstress of the insulator due to the local field distortion, and may even initiate the surface flashover. Therefore, it is very necessary to study the surface charge accumulation and decay on polymer materials under DC voltage in order to get a theoretical basis for the design of DC composite insulators, considering...
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Young-Maan Cho (Hanyang Univ.)04/06/2018, 13:30Poster Presentation
The interruption performance of the Molded Case Circuit Breaker (MCCB) is important because this circuit breaker is closest protection device to consumer at the power distribution system. Basically, the interruption process of the MCCB is follows: when the fault current inflows, the trip unit detects it and operates stator to separate fixed electrode and moving electrode. Next, the arc...
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Dr Wang Xilin (Graduate School at Shenzhen, Tsinghua University Shenzhen, China)04/06/2018, 13:30Poster Presentation
In South China and Southwest China, 10 kV switchgear running under high temperature and high humidity, which is easier to induce switchgear partial discharge and then benefit the development of insulation fault, seriously affect the safe operation of power grid. At this stage, the protective measures of the switchgear insulation are limited to preventive measures and can’t protect the...
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04/06/2018, 13:30Poster Presentation
Dielectrophoresis has become a very important tool in the aspect of utilizing microscopic dielectric particles in recently years. More and more developments have been achieved in various subjects, such as: chemistry, life science, astronomy and engineering. In these developments, manipulation of these small dielectric particles is the main problem due to quantifying FDEP (dielectrophoretic...
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04/06/2018, 13:30Poster Presentation
To enable employment of 3D printed polymeric components in high voltage pulsers and related support systems, compatibility with materials commonly used for insulation and cooling in these systems must be known. Polymeric test samples, printed with four common 3D printing techniques (fused deposition modeling, stereolithography, polymer jetting, and selective laser sintering) were exposed to...
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04/06/2018, 13:30Poster Presentation
with the development of power grid, the practicability and reliability of the evaluation method of transformer, as the key equipment of power network, are paid more and more attention. Aiming at the problem that some evaluation indexes are not easy to quantify in transformer evaluation system, a transformer condition assessment method based on cloud matter element and cooperative game is...
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04/06/2018, 13:30Poster Presentation
Partial discharge(PD) in gas-insulated switchgear(GIS) includes electrical signals with broad bandwidth. In order to simulate and study the propagation characteristics of specific frequency band, pulses with rise time on the order of subnanosecond are required. We have developed a pulse generator which provides 240ps rise time with an amplitude up to 2kV into a 50Ω coaxial capactive load with...
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Dr Jose Rossi (National Institute for Space Research)04/06/2018, 13:30Poster Presentation
Nonlinear transmission lines (NLTLs) have been the subject of several studies that have shown their suitability in high-speed systems for a wide variety of applications as pulse compression, phase shifter, frequency multiplier, pulsed radar, battlefield communication disruption and also as a high power microwave source, holding in this case an additional way to generate radio frequency (RF)...
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04/06/2018, 13:30Poster Presentation
I. Background
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Transformer’s insulation structure profoundly determines device’s lifetime. As novel method, Frequency Domain Spectroscopy, which based on the principle of dielectric response, attracts researchers all over the world for its advantages of richer information details, excellent interference immunity and non-destructive. However, Frequency Domain Spectroscopy's characteristic... -
Prof. Yan Mi (Chongqing University)04/06/2018, 13:30Poster Presentation
Epoxy resin of saturable reactor for UHVDC converter valves works in high temperature condition for long-term, and it also suffers from bipolar exponential decay pulse voltage erosion. In order to study the electro-thermal aging law of epoxy resin, the electro-thermal aging tests under pulse aging and sinusoidal aging are carried out. Pulse aging voltage is set as bipolar exponential decay...
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Mr Eric Bauer (The Ohio State University)04/06/2018, 13:30Poster Presentation
Series arcs can occur in dc power systems whenever an energized wire supplying power to a load is interrupted. This can happen when a wire snaps abruptly or when a load connection becomes loose. Rather than ending in a simple open circuit, the inductance in series with the load establishes an arc, which inserts an additional impedance in between the source and load. The arc impedance decreases...
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04/06/2018, 13:30Poster Presentation
PRIMA (Padova Research on ITER Megavolt Accelerator) is the ITER Neutral Beam Test Facility in Padova, Italy, for the development of the ITER Neutral Beam Injectors (NBI). It comprises two experiments: MITICA, the full-scale prototype of the NBI, designed to produce and neutralize a 40 A negative ions beam, accelerated up to the energy of 1 MeV, and SPIDER, the full-size negative ions source...
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Mr David Alderman (Old Dominion University), Mr Christopher Tremble (Old Dominion University)04/06/2018, 13:30Poster Presentation
Transient plasma ignition (TPI) uses short (typ. nanosecond durations) high voltage pulses to generate highly non-equilibrium plasmas for combustion ignition. TPI allows lean-fuel combustion, improves ignition or combustion efficiency with potentially reduced emission [1,2]. This study evaluates the effect of pulse duration and rise time of >10 kV pulsed plasmas on the ignition plasma...
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04/06/2018, 13:30Poster Presentation
Characteristics of a plasma generated in an arc discharge are investigated. In a discharge, various processes contribute to overall characteristics. Electron chemistry and photonic processes each play a role in establishing the discharge environment based on background pressure and gas species involved. Photonic processes have been incorporated into a PIC-DSMC plasma modeling code, showing...
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04/06/2018, 13:30Poster Presentation
Surface charge accumulation on insulator is one of the main restrictive factors of DC gas insulated pipeline transmission line (DC-GIL). The current research on the accumulation and dissipating mechanism of surface charge has the following deficiencies on the solid side. Firstly, the volume conductivity of insulators are usually taken as a fixed value,so the comprehensive effect of electric...
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Mr Tomohiko Yamashita (Graduate School of Science and Technology, Kumamoto University)04/06/2018, 13:30Poster Presentation
The phenomenon of metal removal from optical discs using pulsed power has been investigated. Pulsed power with 35.3 J/pulse was applied to concentric ring electrodes placed on the optical discs. The protective layer containing the metal layer was completely separated from the plastic substrate by about 30 shots of pulsed power. In order to clarify the mechanism of the metal removal, discharge...
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04/06/2018, 13:30Poster Presentation
There are plenty of factors that influence partial discharge (PD) phenomena of insulating materials in high voltage direct current (HVDC) system, one significant and severe problem is the distorted voltage caused by harmonics. The minor insulation of valve side windings for converter transformer withstands complex electrical stress, which is fundamental AC voltage superimposed with harmonics....
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04/06/2018, 13:30Poster Presentation
Oil-immersed pressboard are used in transformer to separate high voltage winding and low voltage winding, as well as providing structural support. Thus during normal operation of a transformer, oil-immersed pressboard will be subjected to the action of mechanical stress and constantly aging. Moreover, when the transformer suffers a sudden short-circuit, huge axial force will act on the...
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04/06/2018, 13:30Poster Presentation
Purpose/Aim
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Metal enclosed switchgears, which have been widely used, play an important role in power distribution network. However, its frequent faults are becoming an increasingly serious threaten to the grid security. Prior to faults, partial discharge (PD) would happen due to some insulation defects under electrical, thermal, and mechanical stress with the increase in operation time. Thus,... -
04/06/2018, 13:30Poster Presentation
The effective identification of ultrasonic direct wave signal is the key to the success of the partial discharge(PD) location of electrical equipment, and it is also a hot spot of research at home and abroad. Based on this, this paper proposes a method based on improved support vector machine (Improved SVM) to identify PD ultrasonic direct wave signal. The parameters of support vector machine...
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Dr Jose Rossi (National Institute for Space Research)04/06/2018, 13:30Poster Presentation
There is a growing interest in the development of dielectric materials of high voltage breakdown strength used in compact pulse forming lines (PFLs) to drive high power microwave (HPM) sources and pulsed lasers. Therefore, much attention has been paid to polymer-ceramic composites, where normally the ceramic powders with high dielectric constant are dispersed in a polymer matrix of high...
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04/06/2018, 13:30Poster Presentation
Abstract: Charge accumulation on the surface of polymer insulators under DC voltage usually presents two different distribution characteristics, which can be called "dominant pattern" and "charge speckle" pattern respectively. Under "dominant pattern", the charge distribution is uniform and the polarity is the same as the applied voltage; However, the charge density of "charge speckle "is...
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04/06/2018, 13:30Poster Presentation
Atmospheric pressure plasma jets (APPJs) are suitable for uneven surface and larger-scale treatment, which have been a research hotspot in recent years,ex.surface modification for high voltage insulation. But the interaction between individual jets is the main concern impeding their wide application. In this paper, the temporal-spatial distribution of reactive species in one-dimensional plasma...
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04/06/2018, 13:30Poster Presentation
Aiming at the μs-class response speed and the requirement of pulsed high-current test of the ampere-level current amplitude, a mathematical model of self-integrating Rogowski coil was established. The amplitude-frequency characteristic of self-integrating Rogowski coil was analyzed. The influence of magnetic core material, the structural parameters and electromagnetic parameters can be...
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04/06/2018, 13:30Poster Presentation
Kraft paper, as a main kind of insulation statistic in power transformer, is enduring various effects form outside all the time. These effects contain heat, mechanical stress, water and etc. The main influence factor has been pointed to be heat. The cellulose chain in paper degrades under the effect of heat, which turns to the result that Kraft paper become crisper. At this condition, if paper...
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04/06/2018, 13:30Poster Presentation
While gas breakdown is generally driven by Townsend avalanche, field emission dominates for microscale gaps [1]. Recently derived closed form solutions unify these mechanisms with good agreement to experiment while analytically demonstrating the transition between them [2]. One weakness of these approaches is that they fit the field enhancement factor empirically, preventing a priori...
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04/06/2018, 13:30Poster Presentation
The spark paths of SF6 are tortuous in non-uniform electric field, for the randomness of gas discharge and the influence by the space charge. Meanwhile, the breakdown voltage appears non-monotonous trend with the variation of pressure. This phenomenon is called as corona stabilization because it is caused by the space charge generated by corona discharge. This paper focuses on the relationship...
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04/06/2018, 13:30Power Electronics, Power Supplies, Prime Power, Rotating Machines, and Energy ConvertersPoster Presentation
Purpose/Aim
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Partial discharge (PD) is the main reason for the insulation deterioration inside the electrical equipment. It’s necessary and valuable to locate the PD source occurred in electric power system timely and accurately. At present, ultrasonic array location method is an effective way in partial discharge detection. With high signal gain, strong anti-interference ability as well as...
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