scholarly journals SYSTEM FOR REMOTE MONITORING OF HIGH-VOLTAGE CABLE LINE STATE

2020 ◽  
Vol 2020 (57) ◽  
pp. 10-14
Author(s):  
A.A. Shcherba ◽  
◽  
A.D. Podoltsev ◽  
I.M. Kucheriava ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Remote Monitoring ◽  
Thermal State ◽  
Electric Energy ◽  
Quantitative Relationship ◽  
Measured Temperature ◽  
Cable Line ◽  
Outer Sheath ◽  
Diagnostic Characteristics ◽  
State Of Power

The article proposes a device for remote monitoring of high-voltage cable line state. The device gives a possibility to measure simultaneously several diagnostic characteristics, i.e. the temperature of cable outer sheath, electric current in cable core, capacitive current to earth and uses a specially designed internal electric power source that directly converts the energy of cable electromagnetic field into electric energy with necessary parameters. By computer simulation, the temperature field distribution in the cable cores of 330 kV cable line is determined and the quantitative relationship between the directly measured temperature on the cable outer sheath and the temperature values of the cable core and insulation, which are important diagnostic characteristics of the thermal state of power cables is revealed. References 5, figures 3.

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

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1004 ◽  
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”).

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

2019 ◽  
Vol 90 (2) ◽  
pp. 130-134
Author(s):  
R. K. Borisov ◽  
S. S. Zhulikov ◽  
P. S. Glazunov ◽  
M. A. Koshelev ◽  
B. K. Maksimov ◽  
...  
Keyword(s):  
High Voltage ◽  
Remote Monitoring ◽  
Operating Voltage ◽  
Software Complex

A search map for organic additives and solvents applicable in high-voltage rechargeable batteries

2016 ◽  
Vol 18 (38) ◽  
pp. 26807-26815 ◽  
Author(s):  
Min Sik Park ◽  
Insun Park ◽  
Yoon-Sok Kang ◽  
Dongmin Im ◽  
Seok-Gwang Doo
Keyword(s):  
Lithium Ion Batteries ◽  
Functional Groups ◽  
Organic Compounds ◽  
High Voltage ◽  
Lithium Ion ◽  
Quantitative Relationship ◽  
Rechargeable Batteries ◽  
Cycle Performance ◽  
Redox Potentials ◽  
Organic Additives

A search map composed of the redox potentials of ∼1 000 000 organic compounds is theoretically generated for finding novel electrolytes. The quantitative relationship between the redox potentials and functional groups is suggested. The cycle performance of lithium ion batteries is improved by applying a screened anodic additive.

scholarly journals Analysis of Thermal State of Power Transformer of Captive Power Plant

2015 ◽  
Vol 129 ◽  
pp. 832-838 ◽  
Author(s):  
Yu.N. Kondrashova ◽  
R.R. Khramshin ◽  
A.A. Nikolaev ◽  
G.V. Shurygina
Keyword(s):  
Power Plant ◽  
Thermal State ◽  
Power Transformer ◽  
State Of Power

scholarly journals Thermal Effect of Single Loop Shield on High-Voltage Cable Line Capacity

2021 ◽  
Author(s):  
Oleksandr Tkachenko ◽  
◽  
Vladimir Grinchenko ◽  
Pavel Dobrodeyev ◽  
◽  
...  
Keyword(s):  
Thermal Effect ◽  
High Voltage ◽  
Thermal Field ◽  
Magnetic Coupling ◽  
Maximum Temperature ◽  
Thermal Resistivity ◽  
Power Cables ◽  
Cable Line ◽  
Single Loop ◽  
Short Section

The paper deals with a single-loop shield with an asymmetric magnetic coupling used for a magnetic field mitigation of a high-voltage three-phase cable line. The goal is to evaluate a thermal effect of this shield on a cable line capacity. To calculate the flat cable line capacity in the nonshielded case, we use a standard IEC 60287. To achieve the goal we carry out a numerical simulation of the thermal field when the shield is installed. Wherein, we deal with two specific sections. One is a long section with the shield being distant from the cable line. The other is a relatively short section where the shield is located near the power cables. The thermal field is applied for a long section in a two-dimensional formulation, and a three-dimensional formulation is used for the short section. Hence, we have obtained the dependences of the maximum temperature of the power cables on parameters of the shield and its location height above the cable line. The most significant allowable cross-sections of the shield cable and their location height have been determined, when the thermal effect of the shield does not decrease the cable line capacity. These results have ensured the maximum cable line capacity while shielding. The shield temperature is shown to exceed the allowable level in the short section. To reduce it the thermal backfill has been used. We recommend the values of its thermal resistivity to be used for different parameters of the single-loop shield.

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