Flashover Performance of Porcelain Post Insulator with Full-Clad Booster Shed

Liu, Chuang; Zhu, Yong; Fang, Jiang; Liu, Chao; Wang, Liang

doi:10.1109/tdc.2018.8440283

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…By substituting x c into (13) and (14), the critical flashover voltage U c and the critical leakage current I c can be obtained. , x c2 , and x c3 ) is shown in Figure 5.…”

Section: Critical Flashover Voltagementioning

confidence: 99%

“…Due to frequent ice flashover trip accidents in the power grid, research on the ice flashover for insulators recently has been a hot field. The research on the ice flashover performances of insulators helps to solve the external insulation design of transmission lines [8][9][10][11][12][13][14][15]. Wang and co-authors [16] studied the influence of the different shed structures of the insulators on the ice flashover performances.…”

Section: Introductionmentioning

confidence: 99%

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Novel dc flashover model for predicting flashover voltage of the iced insulators

et al. 2020

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This work first proposes a novel flashover model based on the deduced residual resistance of the ice layer. The most important finding of the field icing tests is that the double‐layer ice‐melting water film exists on the inner and outer surfaces of the ice layer. The conductivity of melting water on the inner and outer surface of the ice layer has been measured, and the corresponding surface conductivity has been calculated. According to the proposed flashover model, the ratio η of the resistance of the ice layer to that of the pollution layer gradually increases with the increase of the ratio k of the resistance of the outer surfaces to that of inner surfaces, and eventually approaches saturation. Furthermore, the icing flashover criterion has been modified, and the voltage gradient of the inner surface is less than that of the outer surface. Test results show that the ice flashover voltage is lower than the pollution flashover voltage between 2.18–9.69% and 14.75–20.32% under light ice and semi‐cylindrical ice, respectively. The simulation results based on the proposed model and the classic model are compared with the field test data. Results show that the proposed model could attain a high accuracy of dc flashover voltage and demonstrate the effectiveness of the proposed model.

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“…By substituting x c into (13) and (14), the critical flashover voltage U c and the critical leakage current I c can be obtained. , x c2 , and x c3 ) is shown in Figure 5.…”

Section: Critical Flashover Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel dc flashover model for predicting flashover voltage of the iced insulators

et al. 2020

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“…Surface discharge is a discharge that occurs in an area directly adjacent to a dielectric surface with an excess electric field, thereby triggering a discharge [10]. If a surface discharge persists, it can cause a flashover [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Studi Pengaruh Kelembapan dan Polutan pada Kinerja Isolator Arrester 20 kV

Naufal Hilmi Fauzan,

Sasongko Pramonohadi,

Muhammad Ariq Achnida Syam

et al. 2023

JNTETI

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Arrester merupakan sebuah perangkat yang berfungsi untuk melindungi peralatan dari kegagalan dielektrik yang disebabkan oleh impuls petir, switching surge, ataupun lonjakan tegangan yang melebihi kemampuan dielektrik suatu peralatan. Pada sebagian besar arrester dipasang alat penghitung kerja arrester (event counter) yang berfungsi untuk menghitung frekuensi arrester telah bekerja. Di kondisi lingkungan lembap dan polusi tinggi, pada bagian isolator sangat mudah terjadi surface discharge. Surface discharge merupakan discharge yang terjadi pada suatu daerah yang berhubungan langsung dengan permukaan dielektrik yang memiliki medan listrik berlebih, sehingga memicu terjadinya discharge. Surface discharge yang berlangsung secara terus-menerus dapat mengakibatkan flashover. Flashover yang mengenai bagian dari event counter dapat membuat event counter mengalami error sehingga tidak menunjukkan angka yang benar. Di samping itu, kinerja event counter akan terganggu. Untuk itu, perlu dilakukan pengujian isolator arrester dengan tiga skema, yaitu isolator kondisi bersih, isolator kondisi lembap, serta isolator dengan kondisi lembap dan berpolutan. Pada pengujian ini, digunakan polutan dengan nilai equivalent salt deposit density (ESDD) sebesar 4,69 mg/cm2 dan nilai nonsoluble deposit density (NSDD) sebesar 1,8841 mg/cm2. Berdasarkan hasil pengujian, diketahui bahwa terjadi penurunan kemampuan isolasi arrester dalam menahan tegangan yang diakibatkan oleh kelembapan dan polutan. Kelembapan memberikan penurunan breakdown voltage (BDV) sebesar 5,8 kV setiap kenaikan kelembapan 5%, sedangkan polutan memberikan penurunan BDV sebesar 59 kV ketika isolator diberi polutan.

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“…Yu et al performed the tests on the 500 kV porcelain bushing with 4 and 8 BS (spacing distance of 1165 and 580 mm) and found the maximum withstand voltage increased by 72.7% and 127.3%, respectively, compared with that without BS under rain of 10 mm/min [7]. A recent study by Liu et al indicated that the flashover voltage of 110 kV porcelain post insulator with 3 BS (spacing distance of 400 mm) was 26.5% higher than that without BS under rain of 2 mm/min [8].…”

Section: Introductionmentioning

confidence: 99%

Study on Surface Rainwater and Arc Characteristics of High-Voltage Bushing With Booster Sheds Under Heavy Rainfall

et al. 2020

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The flashover performance of insulators can be improved by BS (booster sheds) in the rain, which is mainly attributed to the reasons that BS break up long cascades of water and block connections of arcs. However, surface rainwater characteristics and arc characteristics of bushing have not been quantitatively studied under heavy rainfall. In this paper, the artificial rain tests were conducted on a 500 kV transformer high-voltage bushing equipped with and without BS under the rainfall intensity of 10 mm/min. X (the total length of water column) and Larc (the critical length of arc) on the bushing surface were taken as the feature parameters of surface rainwater characteristics and arc characteristics, respectively. The effects of BS on Eh (the rain flashover voltage gradient along the insulation height), X and Larc were investigated, respectively. Furtherly, the relationships were studied among Eh, X and Larc. Results indicate that Eh has a sharp rise as the number of BS (NBS) is from one to two, however the rise of Eh gradually decreases when NBS exceeds two. X decreases while Larc increases with the rise of NBS, however both the change ranges of them continually fall. Furthermore, Larc presents remarkable negative correlation to X because of the effect of the electric field. Eh rises nonlinearly with the decrease of X, which is due to the change of the wetting uniformity on the bushing surface and the potential redistribution along air gaps in the presence of the local arc.

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Flashover Performance of Porcelain Post Insulator with Full-Clad Booster Shed

Cited by 5 publications

References 3 publications

Novel dc flashover model for predicting flashover voltage of the iced insulators

Novel dc flashover model for predicting flashover voltage of the iced insulators

Studi Pengaruh Kelembapan dan Polutan pada Kinerja Isolator Arrester 20 kV

Study on Surface Rainwater and Arc Characteristics of High-Voltage Bushing With Booster Sheds Under Heavy Rainfall

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