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What is the impact of creepage distance on the design of high voltage capacitors?

How does the creepage distance influence high voltage capacitors? The answer depends on the actual application. Different media, because of the different dielectric insulation, will have different design results.

For example, put a high voltage ceramic capacitor in a vacuum environment, the height of ceramic chip is 5MM. In other words, the distance between two poles is 5MM. What is the safe working voltage? After the experiment, we found that the vacuum is good, the insulation strength in the vacuum should not be discharged, because there is no air molecule. However, after powering up to 3KV, there will be a discharge phenomenon, which is abnormal when it is close to 5KV.

What is the problem? Is the vacuum not good enough, gas exist? the quality of high voltage ceramic capacitors is not good enough? Perhaps, this will be a controversial focus. In fact, the reason is very simple, vacuum and high voltage ceramic capacitors are good. The thickness of 5MM already has a voltage strength of more than 10KV. Why did an electric spark still happen?

Creepage distance is the problem. Under the high voltage of 5KV, the two poles of the high voltage capacitor are discharged because the distance is too short. The distance problem is not related to the product quality itself. Therefore, Design adjustments, or technically, to make a protection between the two poles, so that the distance between the poles is increased. If you want to boost to about 6KV, we recommended that the height of the capacitor or the distance between the poles should more than 8MM.

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