scholarly journals Transient processes and voltage overloads in single-phase high voltage cable lines

2017 ◽  
Vol 4 (1) ◽  
pp. 3-9
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Transient Processes ◽  
Cable Lines

scholarly journals Simulation study of 6–10 kV cable lines for transient processes calculation during earth faults

Vestnik IGEU ◽  
2021 ◽  
pp. 30-40
Author(s):  
V.A. Shuin ◽  
Yu.D. Kutumov ◽  
N.V. Kuzmina ◽  
T.Yu. Shadrikova
Keyword(s):  
Frequency Dependence ◽  
Single Phase ◽  
Transient Processes ◽  
Cable Line ◽  
Frequency Dependent ◽  
Cable Networks ◽  
Ground Fault ◽  
Three Phase ◽  
Frequency Independent ◽  
Cable Lines

As a rule, researchers do not consider the dependence of the inductance of cable lines on frequency in their scientific papers devoted to the calculation of transient processes during single phase-to-ground fault in 6–10 cable networks. In some cases, it can lead to significant errors in evaluation of current and voltage transient components parameters. Therefore, it is an urgent task to estimate defined errors and the scope of application of frequency-independent equivalent circuits and models of 6–10 kV cable lines during calculation and simulation of transient processes in case of single phase-to-ground fault. The authors applied PSCAD / EMTDC software to study the effect of the frequency dependence of the inductances of 6–10 kV cable lines on the calculation accuracy of transient processes during single phase-to-ground fault. It allows to simulate electric power systems models with the usage of both frequency-dependent and frequency-independent cable line models with round conductors only. To check the adequacy of the frequency-dependent three phase cable model developed in PSCAD software, the authors have used a frequency-dependent model of 6–10 kV three-phase cable with sector-shaped conductors designed in COMSOL Multiphysics software. The authors have developed an approach to develop of 610 kV cable lines models with frequency-dependent and frequency-independent parameters. The authors have obtained error estimation in transient current and voltage parameters during single phase-to-ground fault in cable networks models that do not consider the frequency dependence on inductance (for discharge components the error is 1520 %, for charging components the error is equal to 510 %). It is shown that models with cable line parameters defined according to spreading speed of electromagnetic wave, can be used for approximate calculation of transient current and voltage to solve most of tasks of investigation of transient processes during single phase-to-ground faults. Application of the developed recommendations to determine three phase medium voltage cable lines parameters will increase the calculation accuracy of transient processes during single phase-to-ground faults in 6–10 kV cable networks. Only application of frequency-dependent models of cable lines allows us to provide required accuracy to develop methods of distant earth fault localization in 6–10 kV networks.

INCREASING THE EFFICIENCY OF CONTOUR SHIELDING OF THE MAGNETIC FIELD OF HIGH-VOLTAGE CABLE LINES

2016 ◽  
Vol 2016 (4) ◽  
pp. 5-7
Author(s):  
V.Yu. Rozov ◽  
◽  
P.N. Dobrodeyev ◽  
A.V. Erisov ◽  
A.O. Tkachenko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Voltage ◽  
Cable Lines ◽  
The Magnetic Field

An Analysis of On-Bord High-Voltage Converters of Single-Phase Alternating Current with Increased Miroelectric Power Factor

2020 ◽  
Vol 10 (10) ◽  
pp. 44-51
Author(s):  
Yury Yu. SKOROKHOD ◽  
◽  
Sehgey I. VOL’SKIY ◽  
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Input Current ◽  
Voltage Converter ◽  
Input Unit ◽  
Power Circuit ◽  
Electrical Systems ◽  
Static Converters ◽  
Technical Requirements

The power circuit arrangements of on-board high-voltage static converters fed from a 3000 V AC single-phase network that in the general case produce multi-channel AC and DC output voltages are considered. The basic technical requirements posed to such converters are formulated. The general structural diagram of high-voltage converters with improved electric power consumption quality is given. Possible power circuit arrangements for the high-voltage converter input unit based on single-phase input current correction devices are considered. A classification and criteria for comparative evaluation of the possible power circuit arrangements of these devices are proposed. The information presented in the article will be of interest for specialists engaged in designing on-board electrical systems involving high-voltage converters that must comply with strict requirements for the quality of consumed single-phase input current.

The Field Test of High Voltage Cable Impedance Parameters

2014 ◽  
Vol 986-987 ◽  
pp. 1682-1684
Author(s):  
Gang Chen ◽  
Qing Hao Wang ◽  
Guo Bin Liu ◽  
Tian Shu Hai ◽  
Bo Liu ◽  
...  
Keyword(s):  
Field Test ◽  
High Voltage ◽  
Single Phase ◽  
Measuring Method ◽  
Theory Analysis ◽  
Zero Sequence ◽  
Impedance Parameters

The cables in 66 kV and 220 kV systems are used in single-phase style, and it must be grounded between the cables. The connection ways between different lengths of cables are in different ways, thus, it may occur influence to circuit parameters, especially to zero sequence impedance. In order to clarify the situation from theory analysis to calculate impedance under all kinds of connection modes, the paper gives an actual cable measured value, and introduces the correct measuring method, together, points out the matters needing attention in the measurement.

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