Electric field analysis of composite Insulators under dry condition using Charge Simulation method

2016 ◽  
Author(s):  
M. Kiruthika ◽  
R.V. Maheswari
Keyword(s):  
Electric Field ◽  
Simulation Method ◽  
Field Analysis ◽  
Charge Simulation Method ◽  
Electric Field Analysis

scholarly journals Charge-Simulation-Based Electric Field Analysis and Electrical Tree Propagation Model with Defects in 10 kV XLPE Cable Joint

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4519 ◽  
Author(s):  
He ◽  
He ◽  
Cui
Keyword(s):  
Electric Field ◽  
Water Film ◽  
Simulation Method ◽  
Field Analysis ◽  
Charge Simulation Method ◽  
Metal Debris ◽  
Electrical Tree ◽  
Field Distortion ◽  
Electric Field Analysis ◽  
Air Void

The most severe partial discharges and main insulation failures of 10 kV cross-linked polyethylene cables occur at the joint due to defects caused by various factors during the manufacturing and installation processes. The electric field distortion is analyzed as the indicator by the charge simulation method to identify four typical defects (air void, water film, metal debris, and metal needle). This charge simulation method is combined with random walk theory to describe the stochastic process of electrical tree growth around the defects with an analysis of the charge accumulation process. The results illustrate that the electrical trees around the metal debris and needle are more likely to approach the cable core and cause main insulation failure compared with other types of the defects because the vertical field vector to the cable core is significantly larger than the field vectors to other directions during the tree propagation process with conductive defects. The electric field was measured around the cable joint surface and compared with the simulation results to validate the calculation model and the measurement method. The air void and water film defects are difficult to detect when their sizes are less than 5 mm3 because the field distortions caused by the air void and water film are relatively small and might be concealed by interference. The proposed electric field analysis focuses on the electric field distortion in the cable joint, which is the original cause of the insulation material breakdown. This method identifies the defect and predicts the electrical tree growth in the cable joint simultaneously. It requires no directly attached or embedded sensors to impact the cable joint structure and maintains the power transmission during the detection process.

Multi-State Electric Field Analysis of 1-Tower-Double-Circuit HVDC Transmission Lines Based on Charge Simulation Method

2014 ◽  
Vol 521 ◽  
pp. 321-329
Author(s):  
Quan Zhou ◽  
Li Tu ◽  
Rui Bie ◽  
Dong Feng ◽  
You Ping Fan
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Transmission Lines ◽  
Electric Field Distribution ◽  
Linear Equations ◽  
Simulation Method ◽  
Operating Conditions ◽  
Field Analysis ◽  
Hvdc Transmission ◽  
Electric Field Analysis

Currently, there is little experience about design of the 1-tower-double-circuit DC transmission lines. But the electromagnetic field distribution under its lines is complicated. In order to study the nominal electric field distribution of 1-tower-double-circuit DC transmission lines under different situations and a variety of operating conditions, the currents with analytical solutions are used to simulate the discrete or uneven distributed continuous charge. In the works within an acceptable range, the linear equations are built to solve simulation charge according to the electromagnetic theory. And ground nominal electric field of 1-tower-double-circuit DC transmission lines is calculated. The nominal electric field distribution extreme value extreme under different arrangements and nominal electric field distribution under a variety of operating conditions are analyzed comparatively. In this paper, the results show that the arrangements of lines have effects on the distribution characteristics of nominal electric field in normal condition. When monopole or bipolar or the bipolar of one line doesnt work, the change of nominal electric field is pronounced, but their extremes reduce.

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