scholarly journals Open‐phase temporary overvoltage before and after an intermediate subsation accessing a long distance transmission line

2020 ◽  
Author(s):  
Chen Xiaoyue ◽  
He Zeyu ◽  
Wu Huashi ◽  
Lu Hailiang ◽  
Wang Yu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Long Distance ◽  
Open Phase ◽  
Long Distance Transmission ◽  
Before And After

scholarly journals Application of Total Adaptive Generation Controller (TAGEC) to a Hydropower Generator Connected with a Long-distance Transmission Line

1993 ◽  
Vol 113 (10) ◽  
pp. 1155-1164
Author(s):  
Yasuo Morioka ◽  
Hiroyuki Tanaka ◽  
Takehiko Kojima ◽  
Tomohiro Suzuki ◽  
Shun-ichirou Hanada
Keyword(s):  
Transmission Line ◽  
Long Distance ◽  
Long Distance Transmission

scholarly journals STUDY OF VOLTAGE MODE IN THE LONG-DISTANCE AC TRANSMISSION LINE

2021 ◽  
Vol 2021 (59) ◽  
pp. 43-55
Author(s):  
T.L. Katsadze ◽  
◽  
D.V. Nastenko ◽  
O.M. Panienko ◽  
O.M. Iankovska ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Transmission Line ◽  
Extreme Point ◽  
Transmission Lines ◽  
Power Transmission ◽  
Voltage Distribution ◽  
Long Distance ◽  
Third Order ◽  
Long Distance Transmission ◽  
Wide Range

The charging currents of EHV transmission lines cause the Ferranti effect, which causes an increase in voltage at intermediate points transmission line. The work aims to study the laws of the voltage distribution along the line route and to develop a method for determining the coordinates of a point with extreme voltage. Methodology. Mathematical modeling of long-distance transmission lines in Wolfram Mathematica allowed to form the laws of the voltage distribution along the line and determine the coordinate of the extreme point on the voltage. Results. It is shown that the application of the traditional model of idealized power transmission causes high modeling accuracy only in the modes of unloaded line and low loads. In the range of medium and high loads, the simulation error reaches unacceptably large values. The paper proposes more accurate models for determining the coordinate of an extreme voltage point: linearized and second- and third-order models. It is shown that the proposed models are characterized by higher accuracy in a wide range of loads. Increasing the degree of the model results in higher accuracy, but is associated with an increase in the cumbersomeness of the mathematical model. It is shown that first and second-order models provide sufficient accuracy for typical designs of 750 kV power transmission lines. It is shown that neglecting the losses on the corona has almost no effect on the accuracy of calculating the coordinates of the extreme point on the voltage, which simplifies the linear calculation model and models of the second and third-order. Originality. Mathematical models of the first, second and third orders have been developed for high-precision determination of the coordinate of a voltage-extreme point along a long-distance transmission line. Practical significance. The offered mathematical models are intended for application in problems of regulation and adjustment of parameters of flexible power transmissions. Ref. 12, figure, tables 4.

scholarly journals Similarity Criteria of EHF Physical Model of Long Distance Transmission Line with Plate Phases

1988 ◽  
Vol 13 (1) ◽  
pp. 7-18
Author(s):  
M. Hamed
Keyword(s):  
Transmission Line ◽  
Physical Model ◽  
Transmission Lines ◽  
Power Transmission ◽  
Similarity Criteria ◽  
Long Distance ◽  
Potential Coefficient ◽  
Overhead Transmission Line ◽  
Long Distance Transmission ◽  
Independent Parameters

Carson's equations for computation of frequency dependent parameters of overhead transmission line are modified. The earth is considered to be homogenous. The optimal required number of terms of Carson's series for applications on computer is determined. Accurate mathematical expressions for resistance and inductance of overhead transmission lines are obtained.Different arrangements of conductors for double circuit transmission lines are studied. The mutual inductance and potential coefficient (mutual capacitance) of such arrangements are computed. Double voltage class type double circuit transmission lines are suggested. The plate type double circuit lines are proposed for power transmission over long distances.This paper presents a mathematical analysis in order to determine the coefficients of similarity criteria of EHF physical model for the given long distance transmission line. The integral analogue method and PI-theorem are used. The independent parameters of EHF physical model are formulated. The scales of four independent parameters of the designed EHF physical model are obtained.

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