Comparison voltage across insulator strings of 69 kV and 24 kV lines due to lightning strokes to top pole and mid span

Rugthaicharoencheep, N.; Thansiphraserth, W.; Phayomhom, A.

doi:10.1109/upec.2012.6398426

Cited by 4 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The critical current is defined as lightning stroke current when injected into the conductor causing flashover. When the critical current is known, BFOR expressed in flashovers per length of line per year can be calculated by [2][3][4] :…”

Section: The Lightning Performancementioning

confidence: 99%

Grounding Design Improvement to Reduce Back Flashover Rate of 69 kV Subtransmission Line in Power’s Distribution System

Songsang

Rugthaichareoncheep

Phayomhom

2015

AMM

View full text Add to dashboard Cite

This paper presents the grounding design improvement to reduce back flashover rate from the lightning of distribution system. The Purpose to reduce effects of lightning overvoltage from back flashover. And study analysis of the condition effects of lightning performance of 69 kV on Metropolitan Electricity Authority (MEA)’s distribution system of Thailand. The technique objective function is an attachment the external ground wire connected between the overhead ground wires and a ground rod for reduce back flashover. Back flashover is one of the major causes of sustained interruption data. Occurs when the amplitude of lightning overvoltage is more than the limit of insulator strings specification. Then generated flashover on insulator skin and induces the voltage line. This paper simulation with Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP) and analysis of lightning performance in terms evaluated pole top voltage and back flashover rate (BFOR). Result after installing the external grounding design system can reduce the effects of lightning and can improve the reliability in distribution system. And the grounding systems designed is can use for guide line to the features typically at locations subject to lightning damage.

show abstract

Section: The Lightning Performancementioning

confidence: 99%

Grounding Design Improvement to Reduce Back Flashover Rate of 69 kV Subtransmission Line in Power’s Distribution System

Songsang

Rugthaichareoncheep

Phayomhom

2015

AMM

View full text Add to dashboard Cite

show abstract

“…For conventional OHLs, several papers have studied that the overvoltage with mid-span terminated by lightning is approximately 1.2 to 2.0 times higher than that with tower top terminated by lightning [5][6][7]. Although the overvoltage at midspan is higher, the insulation strength of the air gap at mid-span is stronger than the insulator surface on the tower, thus backflashover is less likely to occur at mid-span than at the tower.…”

Section: Introductionmentioning

confidence: 99%

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Zhang

Wang

Silva

et al. 2022

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

A design of a fully composite pylon has been proposed for new-generation 400 kV transmission towers to save line corridors and to reduce visual impact. Correspondingly, a method of external down-leads is proposed to bring grounding potential to the shield wires, together with a plan that not all pylons are grounded called 'partially grounded transmission lines' (PGTLs). This paper investigates backflashover performance of a partial grounding scheme of overhead lines (OHLs) supported by composite pylons. The transient analysis was carried out in PSCAD based on Monte Carlo method. For OHLs with every pylon grounded, reducing footing resistance and soil resistivity can improve backflashover performance effectively, but for PGTLs, these two methods do not have obvious effect and increasing insulation distance has limited effect. When lightning strikes at PGTLs, overvoltage is mainly dependent on the distance to the nearest grounded pylon and a longer distance will cause overvoltage with larger amplitude and longer wave front duration. Therefore, backflashover rate also increases along with the distance to the nearest grounded pylon until reaching a value limited by the inceptive condition of flashover. A coefficient recommended by CIGRE TB 63 to estimate backflashover rate is discussed and modified when using in PGTLs.

show abstract

“…For conventional OHLs, several studies have revealed that the overvoltage caused by lightning hitting mid-span is approximately 1.2 to 2.0 times higher than that with tower top terminated by lightning [42,122,123]. BF is less likely to happen at mid-span than at the tower, despite the fact that the overvoltage at mid-span is larger because to the stronger insulation strength of the air gap at mid-span than the insulator surface on the tower.…”

Section: Introductionmentioning

confidence: 99%

Transient Lightning Impulse Performance Analysis of a Fully Composite Pylon with an External-grounding Down-lead

Zhang¹

View full text Add to dashboard Cite

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.-Users may download and print one copy of any publication from the public portal for the purpose of private study or research. -You may not further distribute the material or use it for any profit-making activity or commercial gain -You may freely distribute the URL identifying the publication in the public portal -

show abstract

Comparison voltage across insulator strings of 69 kV and 24 kV lines due to lightning strokes to top pole and mid span

Cited by 4 publications

References 6 publications

Grounding Design Improvement to Reduce Back Flashover Rate of 69 kV Subtransmission Line in Power’s Distribution System

Grounding Design Improvement to Reduce Back Flashover Rate of 69 kV Subtransmission Line in Power’s Distribution System

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Transient Lightning Impulse Performance Analysis of a Fully Composite Pylon with an External-grounding Down-lead

Contact Info

Product

Resources

About