Design and operation of EHV transmission lines including long insulated cable and overhead sections

Colla, L.; Gatta, Fabio Massimo; Iliceto, F.; Lauria, S.

doi:10.1109/ipec.2005.206934

Cited by 11 publications

(9 citation statements)

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“…In order to demonstrate the possible application of the suggested procedure, the developed Mathematica program was used to generate the 3-D and contour plots depicted in Fig.8. They illustrate the distribution of the voltage magnitude along the 200-km long upper line 1 L over the frequency range from zero to 10 kHz. It can be seen from the 3-D plot that under DC conditions (f=0) the voltage is equal to vu=1 per unit over the entire line, as expected.…”

Section: Sample Resultsmentioning

confidence: 99%

“…It shows a sample 400-kV mixed power network comprising two partially undergrounded overhead transmission lines connecting the source at Bus s with the load at Bus 3. Their total lengths are denoted as 1 L The electrical parameters of the overhead lines and cable sections of the considered 400-kV network are given in Table I, based on the references [10,11]. The shunt conductances are negligibly small.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…There is a growing interest in the new concept of the partial undergrounding of high voltage networks comprising overhead transmission lines [1][2][3][4][5][6][7][8][9][10][11][12][13]. It is defined as the replacement of parts of these lines by adequate underground cable sections.…”

Section: Introductionmentioning

confidence: 99%

“…a) The reduced exposure to the adverse environmental and weather conditions b) The narrower required corridors and right-of-ways c) The weaker surrounding magnetic field d) The reduced nontechnical losses, [1][2][3][4][5] On the other hand, the following disadvantages should be taken into consideration: a) The resulting increase in the line cost b) The higher cable charging capacitive reactive power, [1] c) The cost of eventually required shunt reactors d) The increased secondary arc currents associated with the single-pole auto-reclosure and singlephase-to-ground faults, [6] e) The impact of the eventually needed shunt reactive power compensation on the power system's transient stability, [7].…”

Section: Introductionmentioning

confidence: 99%

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The Frequency Characteristics of Mixed Power Networks with Partial Undergrounding

Saied¹

2017

IJPER

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Abstract. This paper deals with the frequency characteristics of partially undergrounded mixed power networks, which include several cable sections replacing parts of the overhead lines. The analysis yields the voltage and current distributions along the normal and the partially undergrounded lines, as well as the frequency dependence of the networks' input impedance. Moreover, the results will show eventually existing localized voltage and current concentrations. The study suggests an exact direct analytical distributed parameter method for modeling the lines and cable sections. Instead of representing a partially undergrounded line by the cascade connection of two-port networks, this paper proposes the use of a single equivalent nonuniform line. The nonuniform circuit parameters are represented by means of step functions in terms of the co-ordinates along the lines. The resulting expressions are substituted in the simultaneous voltage and current differential equations, for which analytical solutions are available in terms of Mathematica Parametric Functions.

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Section: Sample Resultsmentioning

confidence: 99%

Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Frequency Characteristics of Mixed Power Networks with Partial Undergrounding

Saied¹

2017

IJPER

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“…Equation (6) shows that the charging current depends directly on the capacity. Cables can have a large share in the flow of capacitive reactive power in the network, as is also described in [20].…”

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Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

2021

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The main emphasis in the operation of an electricity system is placed on its safe and reliable operation. The flow of reactive power in a network can affect voltage conditions in individual nodes of the transmission system. In recent years, there have been changes in the network that have resulted in increased capacitive reactive power flows from lower voltage levels to higher ones. These flows can cause the voltage to rise above the limit. This paper examines recent changes in the reactive power transmission in the network, especially at lower voltage levels. The possible impact of these changes on the flow of capacitive reactive power at higher voltage levels is analyzed. This paper also presents a description and the simulated impact of power lines at different voltage levels on reactive power flows. Real measurements of different types of consumers at the low-voltage (LV) level are analyzed. Finally, a simulation model was created to simulate the impact of a customer’s power contribution to the reactive power flows from the point of view of a 110 kV voltage node. This node is characterized as a supply point.

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Switching in Electrical Transmission and Distribution Systems

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Design and operation of EHV transmission lines including long insulated cable and overhead sections

Abstract: Singapor

Cited by 11 publications

References 0 publications

The Frequency Characteristics of Mixed Power Networks with Partial Undergrounding

The Frequency Characteristics of Mixed Power Networks with Partial Undergrounding

Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

Special Switching Situations

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