Research on electromagnetic character of 500/220kV mixed-voltage quadruple-circuit transmission line

Liu, Weidong; Liu, Kun; Pan, Mingjiu; Xu, Gang

doi:10.1109/eeeic.2013.6549621

Cited by 13 publications

(9 citation statements)

References 1 publication

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“…As to the zero-sequence components, similar conclusions can be drawn. The relationship between traditional components and e-sequence components is shown in (16), where I 0 σ stands for sum of the zero-sequence currents of the four lines. Equation (17) is derived according to the conclusions above.…”

Section: Fault Sequence Networkmentioning

confidence: 99%

“…[12], but the impedance matrix of the lines is ideal, which is not suitable for QCLAP. Although much effort has been made on the fault analysis of multiple-circuit transmission lines [13][14][15][16][17], the mutual impedances of QCLAP cannot be eliminated completely with these methods. The incomplete decoupling will result in inaccuracy of fault analysis, which poses new challenges to the protection of power systems.…”

Section: Introductionmentioning

confidence: 99%

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A new decoupling method for asymmetry‐parameter quadruple‐circuit lines on same tower

Liu

Fan

Tai

et al. 2015

IEEJ Transactions Elec Engng

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Quadruple‐circuit lines with different self‐impedances have been applied in power system with the development of power industry. However, the different self‐impedances in quadruple‐circuit lines will cause problems in fault analysis and related relay protection in the lines. The impedance matrix of these lines is different from that of symmetrical lines, and existing methods cannot completely eliminate all mutual impedance. A new method is proposed to decouple these asymmetrical quadruple‐circuits lines in this paper. The phase‐to‐phase mutual impedance is eliminated first, and then the line‐to‐line mutual impedance is eliminated according to the circulating current method. The mathematical deduction is formulated to ensure the complete decoupling of the impedance matrix. The fault conditions can be used to obtain the relationship between the independent sequence networks, which can be used to calculate the fault current. Power Systems Computer Aided Design (PSCAD) simulations indicate that the decoupling method is suitable for fault analysis of the quadruple‐circuit lines with different self‐impedances. The related fault analysis method is quite accurate and easy to be applied. The fault analysis accuracy is not affected by the fault resistance, fault type, fault location, or length of lines. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Fault Sequence Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new decoupling method for asymmetry‐parameter quadruple‐circuit lines on same tower

Liu

Fan

Tai

et al. 2015

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

show abstract

“…At present, the design of a multi-circuit mixed-voltage transmission line for a single tower targets power systems with relatively low-voltage levels. Moreover, relevant research focuses on the design of the tower structure, on the excess voltage induced and on field effects [2][3][4][5][6][7]. However, few studies have been conducted on the secondary arc current of multi-circuit mixed-voltage transmission lines on a single tower.…”

Section: Introductionmentioning

confidence: 99%

“…UHV alternating current (AC) transmission lines are widely used to transmit much power over long distances and at little construction cost. Large-scale, multi-circuit, extra-high voltage (EHV) and UHV AC transmission lines are also constructed on a single tower in some special areas in accordance with the practice of 'sending power from the west to the east through a nationwide network and facilitating mutual supply between the south and the north' and with the UHV grid plan [3][4][5][6]. At present, the design of a multi-circuit mixed-voltage transmission line for a single tower targets power systems with relatively low-voltage levels.…”

Section: Introductionmentioning

confidence: 99%

“…Phase sequence significantly influences the degree of line parameter imbalance, which is important in arc extinction [2, 10, 11]. It also affects the electromagnetic field considerably, which must be considered during circuit design [5, 6] along with the line transposition method, tower structure, power flow, fault point, line length [10, 12–15]. To limit the secondary arc current and recovery voltage in practical operation, the neutral reactor compensations of UHV shunt reactors and of high‐speed grounding switching (HSGS) are typically adopted.…”

Section: Introductionmentioning

confidence: 99%

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Secondary arc current of ultra‐high voltage transmission line with a mixed voltage of 1000/500 kV on a single tower

Sima

Wang

Yang

et al. 2015

IET Generation, Transmission & Distribution

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Among the ultra-high-voltage (UHV) grids in eastern China, the construction of multi-circuit transmission lines with mixed voltages on a single tower is a novel transmission technology that can significantly reduce line corridor coverage, maximise the use of tower height and significantly improve power transmission capacity per area. However, the electromagnetic interaction between lines is complicated and interferes with the secondary arc current. This study proposes a hybrid tower model that incorporates double-circuit transmission lines with alternating currents at 1000 and 500 kV. Its secondary arc current is investigated according to circuit analysis and EMTDC in consideration of the electromagnetic coupling effect, along with the influences of line length, compensation, phase sequence and transposition on the secondary arc current. Results show that a strong secondary arc current is generated for 1000 kV transmission lines in accordance with the UHV hybrid transmission project from Ximeng to Shanghai. This finding should be emphasised. Furthermore, the influence of quadruple-circuit line length on the secondary arc current depends on line voltage rating. Finally, this study presents several methods that may reduce the secondary arc current, such as transposing lines evenly and installing suitable neutral reactors.

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Short-circuit current calculation method for partial coupling transmission lines under different voltage levels

Fan

Liu

2016

International Journal of Electrical Power & Energy Systems

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Research on electromagnetic character of 500/220kV mixed-voltage quadruple-circuit transmission line

Cited by 13 publications

References 1 publication

A new decoupling method for asymmetry‐parameter quadruple‐circuit lines on same tower

A new decoupling method for asymmetry‐parameter quadruple‐circuit lines on same tower

Secondary arc current of ultra‐high voltage transmission line with a mixed voltage of 1000/500 kV on a single tower

Short-circuit current calculation method for partial coupling transmission lines under different voltage levels

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