JYJ电机引接线气体和固体之间的沿面放电

Surface discharge between gas and solid

 

 

 

带电作业工具和空气的交界面上出现放电现象称为沿面放电。沿面放电发展成贯穿性的空气击穿称为闪络。沿面放电是一种气体放电现象，由于介质分界面上的电场强度分布不均匀，沿面闪络电压比气体或固体单独存在时的击穿电压都低。

 

The phenomenon of discharge at the interface between live working tools and air is called surface discharge. The development of a surface discharge into a penetrating air breakdown is called flashover. Surface discharge is a kind of gas discharge phenomenon. Due to the uneven distribution of electric field intensity on the dielectric interface, the flashover voltage along the surface is lower than that of the breakdown voltage when the gas or solid exists alone.

 

 

 

沿面放电和固体介质表面的电场分布有很大关系。一般说来，固体介质处于电极间电场中的形式，有以下三种典型情况：JYJ电机引接线气体和固体之间的沿面放电

 

Surface discharge is closely related to the distribution of electric field on the surface of solid dielectric. Generally speaking, the solid medium is in the form of electric field between electrodes. There are three typical cases as follows:

 

 

 

固体介质处于均匀电场中，它与气体的分界面和电力线的方向平行，如下图(a)所示。这种情况在工程上较少遇到，但实际绝缘结构中，介质处于稍不均匀电场中，它的放电现象与上述均匀电场中的情况有很多相似之处。

 

The solid medium is in a uniform electric field, which is parallel to the gas interface and the direction of the power line, as shown in figure (a) below. This situation is rarely encountered in engineering, but in the actual insulation structure, the dielectric is in a slightly uneven electric field, and its discharge phenomenon is similar to that in the above-mentioned uniform electric field.

 

固体介质处于极不均匀电场中，且电场强度垂直于介质表面的分量（以下 简称垂直分量）要比平行于表面的分量大得多，如下图(b)所示。

 

The solid medium is in a very inhomogeneous electric field, and the component with the electric field intensity perpendicular to the surface of the medium (hereinafter referred to as the vertical component) is much larger than the component parallel to the surface, as shown in figure (b) below.

 

固体介质处于极不均匀电场中，但在介质表面大部分地方（除紧靠电极的很小区域外），电场强度平行于表面的分量要比垂直分量大

 

The solid medium is in a very inhomogeneous electric field, but in most parts of the surface of the medium (except for a small area close to the electrode), the component with the electric field intensity parallel to the surface is larger than the vertical component