Optimal compensating scheme for limiting secondary arc current of 1000-kV UHV short parallel lines

Xu, Zhenyu; Zhang, X.; Yan, Xiaoqing; Wen, An

doi:10.1049/iet-gtd.2011.0692

Cited by 11 publications

(10 citation statements)

References 11 publications

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“…For such faults, automatic reclosing is economic and effective method to improve the reliability and transient stability of power system [1][2][3][4][5][6][7][8]. When 3-phase and leader-follower reclosing, especially operated at a low speed, is applied in transmission systems, it is essential to check a synchronism between two separated systems before energizing transmission lines back.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

Oh¹,

Gwon²,

Kim³

et al. 2016

Journal of Electrical Engineering and Technology

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-Most of faults occurring in transmission system are transient. To cope with such faults, automatic reclosing is applied and it is economic and effective method to improve the reliability and transient stability of power system. Many countries applying 3-phase and leader-follower reclosing scheme use a synchronism-check relay to limit impacts associated with automatic reclosing under Live-Bus/Live-Line (LBLL) conditions. Most utilities generally use a standardized conservative setting that is in the range of 20 o to 30 o . However, it might be sometimes not a good idea because each transmission line in system has different system conditions such as system structure, line length and load flow that might result in undesirable system impacts. Therefore, it is necessary to derive the Optimal Synchronism-Check (OSC) phase angle which is appropriate for each transmission system. In this paper, a novel method composed of three steps is proposed to derive the OSC phase angle. The proposed method is applied to transmission system based on actual data from Korea. Computer simulations are performed using ElectroMagnetic Transient Program (EMTP) and simulation results show that proposed method is valid and effective.

show abstract

Section: Introductionmentioning

confidence: 99%

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

Oh¹,

Gwon²,

Kim³

et al. 2016

Journal of Electrical Engineering and Technology

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show abstract

“…By contrast, HSGS is suitable for un-transposed lines [18]. Given perfectly transposed 1000 kV UHV parallel lines, literature [19,20] shows that a single-line compensating model cannot reduce the value of the secondary arc current to lower than the threshold when the line length is longer than 183 km. Moreover, these studies focus on single and double-circuit transmission lines, a small part of which includes the secondary arc current of multi-circuit transmission lines [1,2,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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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“…A better transient stability could be assured if selective pole reclosing schemes are applied [1, 2]. It is well understood that the successful reclosing depends on the rapid extinction of the secondary arc current, which requires proper arc extinction methods [3–13]. Two methods are mainly utilised to limit the secondary arc current.…”

Section: Introductionmentioning

confidence: 99%

“…Two methods are mainly utilised to limit the secondary arc current. One is to equip high‐speed grounding switching (HSGS) [7–9] and the other is to install neutral reactor in the neutral point of the shunt reactors [10–13]. Up to now, neutral reactor is widely utilised especially for EHV/UHV transmission lines.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, neutral reactor is widely utilised especially for EHV/UHV transmission lines. The high charging current of 1000 kV UHV transmission lines requires shunt reactors at both ends of the lines to limit the voltage rise of the receiving end, making this compensating scheme more economical [12, 13]. For the 1000 kV UHV parallel lines shorter than 183 km this compensation can be realised using the single‐line compensating model [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Compensating scheme for limiting secondary arc current of 1000 kV ultra‐high voltage long parallel lines

Yan

Zhang

et al. 2013

IET Generation, Transmission & Distribution

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Optimal compensating scheme for limiting secondary arc current of 1000-kV UHV short parallel lines

Cited by 11 publications

References 11 publications

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

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

Compensating scheme for limiting secondary arc current of 1000 kV ultra‐high voltage long parallel lines

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