A Hardware and Software Complex for Remote Monitoring of a High-Voltage Line Arrester under Operating Voltage

The influence of the periodicity of diagnostic measurements on the operational state of high-voltage transformers is considered. Examples of defects of switching devices of converter transformers and methods for their detection are given. The rationale for the importance of recognition of defects at an early stage of their occurrence is given. The influence of the multiplicity of overvoltages on the service life of converter transformers in the aluminum industry is investigated. Based on the analysis of the service life of converter transformers of one of the powerful aluminum plants, where 83% of converter transformers have exhausted their standard service life, it is shown that in 40% of cases it would be possible to avoid their failures, with timely detection and elimination of emerging defects. Examples of defects of OLR (on-load regulators) of converter transformers and methods for their detection are given. The importance of recognition of defects at an early stage of their occurrence is substantiated. A method for chromatographic analysis of dissolved gases in transformer oil has been developed for the qualitative determination of defects and ways to eliminate them. Examples of diagnostics of converter transformers at operating voltage and working load are given, providing the best quality operational characteristics of converter transformers. The periodicity of diagnostic measurements and the reduction of defects and failures has been substantiated. The question of diagnosing the state of the converter transformer TDNP-40000/10 at an enterprise of the aluminum industry is investigated. Currently, diagnostic methods are being developed based on chromatographic analysis of dissolved gases in transformer oil. The presented method of evaluating the operating parameters of transformers allows for the safe operation of high-voltage transformers and enables to increase the reliability of the power supply scheme of aluminum industry plants.

Download Full-text

Remote Monitoring of Joints Status on In-Service High-Voltage Overhead Lines

Energies ◽

10.3390/en12061004 ◽

2019 ◽

Vol 12 (6) ◽

pp. 1004 ◽

Cited By ~ 1

Author(s):

Carlo Olivieri ◽

Francesco de Paulis ◽

Antonio Orlandi ◽

Giorgio Giannuzzi ◽

Roberto Salvati ◽

...

Keyword(s):

High Voltage ◽

Transmission Lines ◽

Remote Monitoring ◽

Power Transmission ◽

Measurement Data ◽

Time Domain Reflectometry ◽

Overhead Line ◽

Voltage Transformer ◽

Remote Monitoring System ◽

On Line

This work presents the feasibility study of an on-line monitoring technique aimed to discover unwanted variations of longitudinal impedance along the line (also named “impedance discontinuities”) and, possibly, incipient faults typically occurring on high voltage power transmission lines, like those generated by oxidated midspan joints or bolted joints usually present on such lines. In this paper, the focus is placed on the application and proper customization of a technique based on the time-domain reflectometry (TDR) technique when applied to an in-service high-voltage overhead line. An extensive set of numerical simulations are provided in order to highlight the critical points of this particular application scenario, especially those that concern the modeling of both the TDR signal injection strategy and the required high-voltage coupling devices, and to plan a measurement activity. The modeling and simulation approach followed for the study of either the overhead line or the on-line TDR system is fully detailed, discussing three main strategies. Furthermore, some measurement data that were used to characterize the specific coupling device selected for this application at high frequency—that is, a capacitive voltage transformer (CVT)—are presented and discussed too. This work sets the basic concepts underlying the implementation of an on-line remote monitoring system based on reflectometric principles for in-service lines, showing how much impact is introduced by the high-voltage coupling strategy on the amplitude of the detected reflected voltage waves (also named “voltage echoes”).

Download Full-text

Remote monitoring of the degree of pollution of high voltage insulator strings via satellite with a sensor system network

2010 IEEE Sensors ◽

10.1109/icsens.2010.5690717 ◽

2010 ◽

Cited By ~ 2

Author(s):

R A de Lima ◽

Eduardo Fontana ◽

J F Martins-Filho ◽

L Prata ◽

G O Cavalcanti ◽

...

Keyword(s):

High Voltage ◽

Remote Monitoring ◽

Sensor System ◽

High Voltage Insulator ◽

Voltage Insulator

Download Full-text

Ultrathin Cu-MOF@δ-MnO2 nanosheets for aqueous electrolyte-based high-voltage electrochemical capacitors

Journal of Materials Chemistry A ◽

10.1039/c8ta05976d ◽

2018 ◽

Vol 6 (36) ◽

pp. 17329-17336 ◽

Cited By ~ 33

Author(s):

Jing Xu ◽

Yan Wang ◽

Shuai Cao ◽

Jian Zhang ◽

Guangxun Zhang ◽

...

Keyword(s):

High Voltage ◽

Aqueous Electrolyte ◽

Electrochemical Capacitors ◽

Water Electrolysis ◽

Operating Voltage ◽

Asymmetric Supercapacitor ◽

Mno2 Nanosheets

Ultrathin Cu-MOF@δ-MnO2 nanosheets have been successfully prepared and the operating voltage window of the asymmetric supercapacitor can reach high values in aqueous electrolyte without any water electrolysis.

Download Full-text

Hardware and software complex for remote monitoring and control of a pregnant woman's health state

Information and Control Systems ◽

10.31799/1684-8853-2021-6-21-30 ◽

2021 ◽

pp. 21-30

Author(s):

Inna Korneeva ◽

Kristina Kramar ◽

Evgeniya Semenova ◽

Aleksander Sergeev ◽

Zafar Yuldashev

Keyword(s):

Pregnant Woman ◽

Pregnant Women ◽

Remote Monitoring ◽

Medical Institution ◽

Health State ◽

Biomedical Data ◽

Experimental Sample ◽

Monitoring And Control ◽

Software Complex ◽

Remote Monitoring Systems

Introduction: The problem of remote monitoring of people's health has become especially urgent nowadays due to the rapid spread of dangerous infectious and viral diseases, such as COVID-19. This period was especially difficult for pregnant women. According to Rosstat statistics, in 2020, maternal mortality in Russia increased by 24.4% compared to 2019 and reached 11.2 per 100,000 newborns. This is the worst level since 2013. In the current conditions, there is a necessity for developing remote monitoring systems which allow you to check the health status of a pregnant woman remotely using tools outside a medical institution. Purpose: To develop the structure and validate the choice of elements for a hardware and software complex which would perform remote monitoring outside a medical institution and assess the condition of pregnant women during their active life. Results: An automated questionnaire for pregnant women has been developed in accordance with the methodological recommendations of the Ministry of Health of the Russian Federation, providing a quantitative assessment of the current state of a pregnant woman in order to study the dynamics of her health. Based on the results of instrumental studies, according to 30 factors of patient's body functioning and the questionnaire data, a set of diagnostically significant indicators was developed. For each of them, a range of values was specified (norm, alarm, pathology). We have developed an experimental sample of the hardware and software complex and tested its functioning, particularly the modes of taking biomedical data by urine tests. The algorithms for processing and analysis of biomedical data have been experimentally studied in order to confirm the validity of the proposed solutions. Practical relevance: The results of the studies allow us to affirmatively answer the question about the possibility of remote monitoring outside a medical institution and assessing the health state of a pregnant woman in order to predict pregnancy complications, as well as to validate the choice of measuring channels for recording a complex of biomedical signals and data, and the choice of algorithms for information processing and analysis.

Download Full-text

Effect of Photoemission on Operating Voltage in the High-Voltage Hollow Cathode Discharge.

Shinku ◽

10.3131/jvsj.36.610 ◽

1993 ◽

Vol 36 (7) ◽

pp. 610-614

Author(s):

Toshihiko ARAI ◽

Miki GOTO ◽

Tetsuo IIJIMA

Keyword(s):

High Voltage ◽

Hollow Cathode ◽

Hollow Cathode Discharge ◽

Operating Voltage

Download Full-text

Design of a Laboratory Electro-hydraulic Installation for Water Disinfection

Elektrotekhnologii i elektrooborudovanie v APK ◽

10.22314/2658-4859-2020-67-2-3-7 ◽

2020 ◽

Vol 67 (2) ◽

pp. 3-7

Author(s):

Aleksandr A. Belov

Keyword(s):

High Voltage ◽

Power Supply ◽

Water Disinfection ◽

Practical Significance ◽

Research Purpose ◽

Operating Voltage ◽

Experimental Sample ◽

Shunt Resistance ◽

Experimental Laboratory ◽

Electrohydraulic Effect

Electrohydraulic effect is used in various fields of industry and agriculture: for cleaning metal casting forms, cleaning pipes of power boilers, treatment of heating radiators, soil treatment and water disinfection. Existing technical means for water disinfection with high-voltage discharges are expensive, cumbersome and untransportable. Currently used installations use an operating voltage of 10-50 kilovolts, capacitors designed for a voltage of no more than 100 kilovolts, with a capacity of 0.025 microfarads. Water disinfection according to the conducted research can be carried out with a voltage of 10 kilovolts. (Research purpose) The research purpose is in developing and manufacturing a laboratory electrohydraulic installation for water disinfection, which has a technical novelty in terms of mobility and compactness for implementing a method of water disinfection at a voltage of no more than 10 kilovolts. (Materials and methods) During the research, next materials, equipment and devices were used: power supply; transformer; capacitor; forming gap; working body; shunt resistance. (Results and discussion) The principle of the electrohydraulic effect, which is a consequence of the occurrence of electrohydraulic shocks between high-voltage electrodes placed in a liquid, is the basis for the development and manufacture of the installation. Authors developed a structural diagram of a laboratory electrohydraulic unit for water disinfection. The article presents an experimental sample of a laboratory installation for water disinfection, which has a technical novelty in terms of mobility and compactness for implementing a method for water disinfection at a voltage of no more than 10 kilovolts. The installation consists of a power supply unit FA-5-1/300W, a high-voltage step-up transformer TDKS32-04, a capacitor K75-29A (16 kilovolts, 1 microfarad), forming a gap of metal balls with a diameter of 18 millimeters, a plastic working body made of ABS material, a shunt resistance of 1 kilohm. (Conclusions) They article shows the scientific and practical significance of the research results: a technical means for water disinfection, providing the possibility of conducting experimental laboratory studies of the electrohydraulic effect at a voltage of no more than 10 kilovolts.

Download Full-text