scholarly journals Trichel Pulse Analysis: Physical Calculation and Validation by Using Broadband Measurements

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4512
Author(s):  
Kerstin Friebe ◽  
Frank Jenau
Keyword(s):  
Early Stage ◽  
Partial Discharge ◽  
Measurement Data ◽  
Energy System ◽  
Engineering Systems ◽  
Precise Understanding ◽  
Measurement Results ◽  
High Level ◽  
Physical Phenomena ◽  
Physical Calculation

Partial discharge measurement is part of the monitoring of equipment in power engineering systems. It provides important information about the condition of the equipment and in particular the condition of the insulation components. This information serves to take necessary preventive measures at an early stage to avoid failures of the affected energy system and thus ensure a high level of energy supply security. Possible causes of partial discharges in energy technology equipment include high field strengths at edges with small radii or defects within insulation materials itself. Depending on the location and extent of the occurrence, partial discharge events may cause lasting damage to components of equipment. In order to be able to interpret the measurement results of partial discharge monitoring with regard to the exact cause and, if necessary, to evaluate them automatically, a precise understanding of the physical phenomena that occur during a partial discharge is necessary. The physical replication of a partial discharge pulse helps to better understand, evaluate, and interpret measurement results and thus create a synergy between measurement data and model-based results.

scholarly journals Prototype Sistem Deteksi Partial Discharge Pada Isolasi Kabel Menggunakan Sensor Microphone (Prototype Of Partial Discharge Detection System In Cable Isolation Using Microphone Sensor)

2019 ◽  
Vol 3 (2) ◽  
pp. 206
Author(s):  
Mochamad Zaeynuri Setiawan ◽  
Fachrudin Hunaini ◽  
Mohamad Mukhsim
Keyword(s):  
Detection System ◽  
Partial Discharge ◽  
Measurement Data ◽  
Negative Ions ◽  
High Sensitivity ◽  
Sound Waves ◽  
Cable Insulation ◽  
Insulation Failure ◽  
Measurement Results ◽  
Discharge Detection

The phenomenon that often arises in a substation is the problem of partial discharge in outgoing cable insulation. Partial discharge is a jump of positive and negative ions that are not supposed to meet so that it can cause a spark jump. If a partial discharge is left too long it can cause insulation failure, the sound of snakes like hissing and the most can cause a flashover on the outgoing cable. Then a partial discharge detection prototype was made in the cable insulation in order to anticipate the isolation interference in the outgoing cable. Can simplify the work of substation operators to check the reliability of insulation on the outgoing side of each cubicle. So it was compiled as a method for measuring sound waves caused by partial discharge in the process of measuring using a microphone sensor, the Arduino Mega 2560 module as a microcontroller, the LCD TFT as a monitoring and the MicroSD card module as its storage. The microphone sensor is a sensor that has a high sensitivity to sound, has 2 analog and digital readings, and is easily designed with a microcontroller. Basically the unit of measure measured at partial discharge is Decibels. The results of the prototype can be applied to the cubicle and the way it works is to match the prototype to the outgoing cubicle cable then measure from the cable boots connector to the bottom of the outgoing cable with a distance of 1 meter. Then the measurement results will be monitored on the TFT LCD screen in the form of measurement results, graphs and categories on partial discharge. In this design the measurement data made by the microphone can be stored with microSD so that it can make an evaluation of partial discharge handling in outgoing cable insulation.

scholarly journals KONSENTRASI SEDIMEN SUSPENSI PADA BELOKAN 57° SALURAN TERBUKA

2018 ◽  
Author(s):  
Ady Purnama
Keyword(s):  
Measurement Data ◽  
Concentration Field ◽  
Sediment Concentration ◽  
Outer Side ◽  
Base Line ◽  
Sediment Suspension ◽  
Straight Line ◽  
Data Value ◽  
Measurement Results ◽  
High Level

Predicting the behavior of the flow in the channel turned quite important, because the channel has turned a fairly high level prone to water damage when compared with the straight line. A phenomenon that often occurs and causes kerugikan in turn channel is the sediment transport phenomena.The phenomenon that occurs in the channel turn can be detected by performing measurements directly in the field. For a case study of parent channel mataram, the research done by measurement of sediment concentration profiles using the tool opcon suspension. The study was conducted on curves that have the angle, α = 57 ° with r = 50 m. From the analysis of the measurements of the concentration of sediment suspensions carried out in an open channel with a bend 57 °, indicating that the concentration of sediment suspension had a trend which is almost equal to the entire face, ie the concentration of sediment suspension is increased toward the base line and decreasing toward the surface of the water with the trend of distribution more upright with values more uniform towards the water surface. In the transverse direction, the concentration of sediment suspension tends to increase toward the inside of the bend when passing through the initial turn, then decreases towards the inside of the bend as it passes through the middle of the turn, and again increased toward the inside of the bend as it passes through the final turn which resulted in the deposition on the inside of the turn ( inner bank) and erosion on the outer side of the bend (outer bank) on the basis of the channel. For the analysis of sediment suspension concentration field measurement results are compared with the analysis of the rouse equation and the equation tanaka-sugimoto show that enough measurement data can predict sediment concentration suspension on curves, although the angle and radius of the bend is varied. Suspension of sediment measurement data value is closer to the data analysis results rouse and tanaka-sugimoto. The results of the analysis of tanaka-sugimoto could provide better results than analysis rouse.

Introduction

2017 ◽  
Author(s):  
Penny Farfan
Keyword(s):  
Case Studies ◽  
Early Stage ◽  
Sexual Norms ◽  
Sexual Identities ◽  
Precise Understanding ◽  
Central Argument ◽  
Late Nineteenth ◽  
The Well Of Loneliness

This introduction sets forth the book’s central argument and establishes the historical, theoretical, and critical context for its case studies. In the late nineteenth and early twentieth centuries, modern sexual identities emerged into view while at the same time being rendered invisible, as in Oscar Wilde’s 1895 trial on charges of gross indecency and the 1928 obscenity trial of Radclyffe Hall’s The Well of Loneliness. Early stage representations of homosexuality were typically coded or censored, yet the majority of the works considered in this book were highly visible in their subversions of conventional gender and sexual norms. Queer readings of these plays and performances establish connections across high and popular cultural domains, demonstrating that some of traditional modernism’s perceived failures, rejects, and outliers were modernist through their sexual dissidence. These insights in turn contribute to a more precise understanding of how modernity was mediated and how such mediations enacted change.

scholarly journals Modeling of German Low Voltage Cables with Ground Return Path

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1265 ◽  
Author(s):  
Johanna Geis-Schroer ◽  
Sebastian Hubschneider ◽  
Lukas Held ◽  
Frederik Gielnik ◽  
Michael Armbruster ◽  
...  
Keyword(s):  
Low Voltage ◽  
Measurement Data ◽  
Analytical Calculation ◽  
Laboratory Measurement ◽  
Model Parameters ◽  
Calculation Methods ◽  
Modeling Approach ◽  
Measurement Results ◽  
Simulation Results ◽  
Return Path

In this contribution, measurement data of phase, neutral, and ground currents from real low voltage (LV) feeders in Germany is presented and analyzed. The data obtained is used to review and evaluate common modeling approaches for LV systems. An alternative modeling approach for detailed cable and ground modeling, which allows for the consideration of typical German LV earthing conditions and asymmetrical cable design, is proposed. Further, analytical calculation methods for model parameters are described and compared to laboratory measurement results of real LV cables. The models are then evaluated in terms of parameter sensitivity and parameter relevance, focusing on the influence of conventionally performed simplifications, such as neglecting house junction cables, shunt admittances, or temperature dependencies. By comparing measurement data from a real LV feeder to simulation results, the proposed modeling approach is validated.

scholarly journals Inverse Infiltration Modeling of Dike Covers Made of Dredged Material Using PEST and AMALGAM

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 41
Author(s):  
Tim Jurisch ◽  
Stefan Cantré ◽  
Fokke Saathoff
Keyword(s):  
Large Scale ◽  
Measurement Data ◽  
Fine Grained ◽  
Dredged Materials ◽  
Measurement Results ◽  
Large Scale Field ◽  
Eigenvalue Ratio ◽  
Ill Posed ◽  
Materials Used ◽  
Installation Technology

A variety of studies recently proved the applicability of different dried, fine-grained dredged materials as replacement material for erosion-resistant sea dike covers. In Rostock, Germany, a large-scale field experiment was conducted, in which different dredged materials were tested with regard to installation technology, stability, turf development, infiltration, and erosion resistance. The infiltration experiments to study the development of a seepage line in the dike body showed unexpected measurement results. Due to the high complexity of the problem, standard geo-hydraulic models proved to be unable to analyze these results. Therefore, different methods of inverse infiltration modeling were applied, such as the parameter estimation tool (PEST) and the AMALGAM algorithm. In the paper, the two approaches are compared and discussed. A sensitivity analysis proved the presumption of a non-linear model behavior for the infiltration problem and the Eigenvalue ratio indicates that the dike infiltration is an ill-posed problem. Although this complicates the inverse modeling (e.g., termination in local minima), parameter sets close to an optimum were found with both the PEST and the AMALGAM algorithms. Together with the field measurement data, this information supports the rating of the effective material properties of the applied dredged materials used as dike cover material.

Lung nodule classification using combination of CNN, second and higher order texture features

2021 ◽  
pp. 1-9
Author(s):  
Amrita Naik ◽  
Damodar Reddy Edla
Keyword(s):  
Malignant Tumors ◽  
Early Stage ◽  
Lung Nodule ◽  
Texture Features ◽  
Svm Classifier ◽  
Softmax Classifier ◽  
Spatial Features ◽  
High Level ◽  
Learning Architectures ◽  
Nodule Classification

Lung cancer is the most common cancer throughout the world and identification of malignant tumors at an early stage is needed for diagnosis and treatment of patient thus avoiding the progression to a later stage. In recent times, deep learning architectures such as CNN have shown promising results in effectively identifying malignant tumors in CT scans. In this paper, we combine the CNN features with texture features such as Haralick and Gray level run length matrix features to gather benefits of high level and spatial features extracted from the lung nodules to improve the accuracy of classification. These features are further classified using SVM classifier instead of softmax classifier in order to reduce the overfitting problem. Our model was validated on LUNA dataset and achieved an accuracy of 93.53%, sensitivity of 86.62%, the specificity of 96.55%, and positive predictive value of 94.02%.

Waukesha Engine’s New 2 and 3 MWE High Performance, Ultra-Lean Engines and Enginators™ for the Worldwide 50Hz and 60Hz Power Generation Markets

2007 ◽  
Author(s):  
Corey A. Honl ◽  
Ryan M. Rudnitzki
Keyword(s):  
Power Generation ◽  
Control System ◽  
High Performance ◽  
Fuel Injection ◽  
Early Stage ◽  
Major Elements ◽  
Product Strategy ◽  
Product Lines ◽  
Stage Performance ◽  
High Level

The following paper describes the release of the 220GL engine and APG2000/3000 Enginator™ product lines from Waukesha Engine. The major elements of the release that will be covered include the installation and calibration of the ESM® control system, the development of new capabilities to control fuel injection and its associated features, the integration of Waukesha-introduced components on the 220GL, high-level product strategy and justification, and early stage performance figures from development testing.

scholarly journals Measurement experiences with FluxSet digital D/I station

2017 ◽  
Vol 6 (2) ◽  
pp. 279-284 ◽  
Author(s):  
László Hegymegi ◽  
János Szöllősy ◽  
Csaba Hegymegi ◽  
Ádám Domján
Keyword(s):  
Measurement Method ◽  
Measurement Data ◽  
Digital Form ◽  
New Instrument ◽  
Measurement Results ◽  
Inclination Angles ◽  
Flux Gate

Abstract. Geomagnetic observatories use classical theodolites equipped with single-axis flux-gate magnetometers known as declination–inclination magnetometers (DIM) to determine absolute values of declination and inclination angles. This instrument and the measurement method are very reliable but need a lot of handwork and experience. The authors developed and built a non-magnetic theodolite which gives all measurement data in digital form. Use of this instrument significantly decreases the possibility of observation errors and minimises handwork. The new instrument is presented in this paper together with first measurement results in comparison to the classical DIM.

scholarly journals The content of N-acetylneuraminic acid in glycoproteins of erythrocyte membranes in Morris hepatoma 5123 bearing rats.

1994 ◽  
Vol 41 (1) ◽  
pp. 13-16
Author(s):  
J Batko ◽  
H Karoń
Keyword(s):  
Tumour Growth ◽  
Early Stage ◽  
Tumour Cells ◽  
Erythrocyte Membranes ◽  
Acetylneuraminic Acid ◽  
Experimental Tumour ◽  
Morris Hepatoma ◽  
High Level

Changes in the content of N-acetylneuraminic acid in rat erythrocyte membranes at different stages of experimental tumour (Morris hepatoma 5123) development were examined. Its content was lowered on the 30th and 40th day after transplantation of the tumour cells, as compared to the results for normal healthy rats. As a result of the tumour growth, the content of N-acetylgalactosamine, galactose and mannose in rat erythrocyte membranes became lowered, whereas that of glucose remained unchanged. The content of fucose was raised at early stage of tumour growth, and remained at this high level till the 40th day of experiment.

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