scholarly journals Electric Field Distribution and AC Breakdown Characteristics of Polluted Novel Lightning Protection Insulator under Icing Conditions

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7493
Author(s):  
Jiazheng Lu ◽  
Jianping Hu ◽  
Zhen Fang ◽  
Xinhan Qiao ◽  
Zhijin Zhang
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Field Distribution ◽  
Goodness Of Fit ◽  
Electric Field Distribution ◽  
Test Method ◽  
Lightning Protection ◽  
Negative Power ◽  
Pollution Levels ◽  
Flashover Voltage

As a result of lightning strikes, pollution, and ice, overhead distribution wires might be short-circuited and trip. As a result, researchers have developed a new lightning protection composite insulator. There is still a need to test its pollution and icing performance. Based on the finite element and field test method, this paper studies the electric field distribution and AC (Alternating Current) breakdown characteristics of polluted novel lightning protection insulators under icing conditions. Firstly, the finite element calculated results show that this novel insulator’s electric field distribution is different from that of a conventional insulator. The locations with sizeable electric fields are located in the insulation section, and the electric field in the arrester section is tiny. In addition, when the insulator surface is covered with ice, there is an increase in the electric field along the surface and pin electrodes. Compared with the dry conditions, when there is an ice layer and icicle, electric field peaks increase by 48.85% and 46.08%, respectively. Secondly, the test results show that there are three types of arc paths in different pollution levels. The arc paths are related to ESDD (equivalent salt deposit density) under icing conditions. Uf shows a downward trend with increased pollution levels, and the maximum flashover voltage is 2.70 times more than the minimum. Finally, four fitting methods are proposed in this paper. After comparing the goodness of fit of different functions, the quadratic function and negative power function with the constant term are recommended as empirical formulas for calculating flashover voltage of novel insulators under icing conditions in different pollution levels. The research results of this paper have a specific guiding role for the selection of the external insulation of transmission lines and structural optimization of novel insulators.

Voltage Distribution Studies in Polluted ZnO Arrester Using the FEMLAB

2011 ◽  
Vol 268-270 ◽  
pp. 412-417 ◽  
Author(s):  
Ferhat Tighilt
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Metal Oxide ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
The Finite Element Method ◽  
Voltage Distribution ◽  
Distribution Studies ◽  
Long Operation

The voltage and electric field distribution in an arrester are very important for its long operation 15 kV with and without pollution. In order to clarify the influence of pollution severity conditions on metal oxide surge arrester, the finite element method (FEM) compilation of the voltage distribution in the ZnO column varistors under different pollution layer conductivity (200 μS, 70μS, 20μS) and clean was employed using the FEMLAB package.

Influence of Ring Length on Electric Field Distribution in CdZnTe Frisch-Ring Detector

2011 ◽  
Vol 695 ◽  
pp. 513-516
Author(s):  
Jie Ren ◽  
Li Fu ◽  
Ling Bao Meng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Field Distribution ◽  
Energy Resolution ◽  
Electric Field Distribution ◽  
Element Method

The CdZnTe (CZT) devices with various screening depth in dimensions 3×3×6mm3 were fabricated. The influence of Ring length (screening depth) and length of crystal on the electric field distribution in CZT devices has been explored by finite element method. The results indicated that ring length (screening depth) plays an important role on the detecting performance of CZT Frisch-ring devices. Longer screening depth gives rise to an electric field which is compressed more greatly. Measured spectra indicated that extreme compressed electric field could reduce detecting resolution. A FWHM energy resolution of approximately 3.71% at 662 keV was obtained for a device with dimensions 3×3×6mm3 and 4.8mm screening depth.

Potential and Electric Field Distribution of 220kV Insulator String with a Faulty Insulator under Windage Yaw Condition

2014 ◽  
Vol 521 ◽  
pp. 317-320
Author(s):  
Hui Hui Li ◽  
Zheng Zheng ◽  
Hong Bo Chen ◽  
Huan Bai ◽  
Hua Zhao Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Field Strength ◽  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Field Distributions ◽  
Space Potential ◽  
Suspension Insulator ◽  
Variation Characteristics

Faulty insulators could appear in the HV transmission line insulator string under the comprehensive effect of electrical, mechanical and environmental factors and they can be detected according to the space potential and electric field distribution variation characteristics around the insulator string. Finite Element Method (FEM) was used to study the potential and electric field distributions of a 220kV suspension insulator string contained a zero-value insulator in windage condition, comparing with a fine insulator string. The results show that the variation of the space potential and electric field distributions of insulator string is the same as that under no windage condition. The curve of synthetic electric field along the central axis around the good insulator string is U-shape. The 10th and 11th insulators from the high-voltage end are the sensitive insulators where the distortion ratio of synthetic field strength is higher than 3%, when a faulty insulator is in the string. This result can provide preferences for the online detection of faulty insulators.

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