How does corona discharge occur? What are its characteristics?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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How does corona discharge occur? What are its characteristics?

发布时间：2016-04-12 来源：ydlcb 浏览次数：37次

In the electric field, one stage is a plate and the other is a rod electrode, forming a rod-plate electrode and constituting an uneven electric field. When the voltage is applied to the rod-plate electrode, the electric field near the rod electrode is very strong, and the electric field drops sharply after a certain distance from the rod. At this time, the rod electrode and the surrounding gas have reached self-sustaining discharge, and corona occurs around it, which is called corona discharge. The corresponding voltage between the two poles is called the corona initial voltage. As the gap voltage increases, the corona discharge continues to expand until the gap is broken down.

In a uniform electric field, such as plate to plate forming a uniform electric field, the electric field strength is equal everywhere, and it is impossible to appear corona.

In a slightly uneven electric field, such as ball-to-ball gap and coaxial cylinder gap, when the gap distance is not large, it is a typical slightly uneven electric field, and GIS equipment makes use of this structure. In a slightly uneven electric field, the corona will also be generated on the electrode with the largest electric field strength before the gas breakdown, because the electric field strength does not decrease much with the increase of distance, so it cannot form a stable corona discharge.

In a highly uneven electric field, such as rod-plate, rod-rod gap constitutes a typical highly uneven electric field, especially in a long gap, the corona initial voltage and breakdown voltage are relatively different, corona voltage mainly depends on the field strength near the electrode surface, that is, depends on the surface shape of the electrode, and the gap breakdown voltage is almost independent of the shape of the electrode. It depends on the electric field distribution in the gap after corona occurs. The more uneven and asymmetric the electric field, the more severe the polarity effect.