Surface Topography of Printed Wiring Boards and Its Effect on Flashover

Gray, Eoin W.; Harrington, Dean

doi:10.1109/tchmt.1982.1135936

Cited by 18 publications

(10 citation statements)

References 9 publications

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“…That means inserting an insulation barrier can barely change the electric field. In our experiment, the improvement of breakdown voltage produced by the barrier is much less than some other papers, which can be as high as 60-80 % [5][6][7][8][9]. This may be due to that in these papers are point-point or point-plane electrode is used.…”

Section: Without Back Electrodementioning

confidence: 55%

“…Second variable is the distance from the HV electrode to the barrier. From [6], the ratio of distance from the HV electrode to the center of the barrier, which is denoted as a, to the gap distance L also has impact on breakdown characteristics. Therefore, it is necessary to perform experiments with different a/L values.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, it is necessary to perform experiments with different a/L values. Many papers [5][6][7][8][9] have pointed out that the breakdown properties change at a/L = 0.2. Then in our research, we decide to study a/L values of 0.1, 0.2 and 0.5.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, figuring out whether it is feasible to improve the breakdown voltage using barrier would be beneficial for improving the reliability of the power equipment with this kind of insulation. Many researchers have performed researches focused on the impact of insulation barrier on breakdown properties [5][6][7][8][9][10][11]. [5][6][7][8][9] have figured out that when the distance from the HV electrode to the barrier is about 20-30 % of the total gap distance, the breakdown voltage reaches the maximum.…”

Section: Introductionmentioning

confidence: 99%

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Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Liu

Karady

2015

IEEE Trans. Dielect. Electr. Insul.

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The grounded back electrode can reduce the breakdown voltage. Inserting an insulation barrier is an effective way to increase breakdown voltage. The objective of this paper is to investigate the impact of barrier on AC breakdown with back electrode. The breakdown voltage is acquired from the experiments. The electric field distribution at breakdown is also obtained via software simulation. The experiments and analysis for both 'with' and 'without' back electrode are performed. From the results, the barrier can effectively increase breakdown voltage, especially for the case with back electrode. Without back electrode, there is only one breakdown trajectory path. The breakdown trajectory is very similar for all breakdown cases without back electrode. However, with back electrode, there are three breakdown trajectory patterns in total. The behaviors of breakdown voltage and electric field vary between different patterns. The analysis indicates that electric field distribution controls breakdown characteristics. The partial discharge (PD) streamers and residual charge induced by the electric field is the key to explain all the phenomena.

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Section: Without Back Electrodementioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Liu

Karady

2015

IEEE Trans. Dielect. Electr. Insul.

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“…Until recently, as for degradation in PWBs, attention has been paid only to the surface phenomena such as surface breakdown, tracking, and surface electrochemical migration [1][2][3][4]. On the other hand, to achieve further integration of circuits, PWBs must have complicated multi-layered wiring of conductors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Possibility of non-destructive detection of electrochemical migration in epoxy resin by the pulsed electroacoustic method

Natsui

Asakawa

Tanaka

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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Pulsed electroacoustic (PEA) method was applied as a nondestructive method to detect electrochemical migration in a sheet of epoxy resin and a sheet of laminate consisting of the same resin and a paper/phenol-resin composite. A significant decrease in the amount of negative charge was observed at the interface between the resin and the composite when the sample was the laminate. This is assumed to be due to the progress of electrochemical migration in the thickness direction. On the other hand, such a change in charge density was hardly observed when the sample was a sheet of epoxy resin. The electric field intensity in the epoxy resin layer in the laminate is assumed to be significantly enhanced, since the resistivity is much higher in the epoxy resin than in the composite. This seems to be the main reason why the electrochemical migration was induced only in the epoxy layer in the laminate. This means that observation of electrochemical migration in epoxy resin by the PEA method becomes possible by forming a laminate structure using the epoxy resin and paper/phenol-resin composite.

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Generation mechanism of electrochemical migration in printed wiring board insulation

Natsui

Asakawa

Tanaka

et al. 2011

IEEJ Transactions Elec Engng

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In order to study the generation mechanism of electrochemical migration in a printed wiring board, paper/phenol‐resin composites with and without an adhesive layer, epoxy resin, and a laminate of epoxy resin and a paper/phenol‐resin composite were aged at 85 °C and 85% relative humidity (RH) with and without application of a DC voltage, and the space charge distributions in the samples were observed by the pulsed electroacoustic method. In the case of the composite with the adhesive layer, a large amount of negative charge is induced at the interface between the composite and the adhesive layer on the anode. It was found that such formation of space charge enhances the electric field intensity at the anode. The reason for this is because the conductivity is much lower in the adhesive layer than in the composite. Electrochemical migration does not occur when the same electric field is applied to the composite without the adhesive layer, whereas it does occur if the adhesive layer was replaced by epoxy resin with a similar conductivity to the adhesive layer. These results clearly indicate that electrochemical migration generates because the electric field at the anode surface is enhanced due to the low conductivity of the adhesive layer. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Surface Topography of Printed Wiring Boards and Its Effect on Flashover

Cited by 18 publications

References 9 publications

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Possibility of non-destructive detection of electrochemical migration in epoxy resin by the pulsed electroacoustic method

Generation mechanism of electrochemical migration in printed wiring board insulation

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