1, ceramic/glass disc suspension insulator

1.1, Shape (Umbrella type)

The shape of AC line insulators can be divided into standard type (ordinary type), bell film type and back mountain type, of which back mountain type can be divided into double umbrella, three umbrella, aerodynamic type.

Standard or ordinary type insulator, ordinary umbrella under the Angle slot, Angle slot to increase the soft electric distance of the insulator, improve the flash voltage. Generally speaking, the edge groove of the insulator is shallow, the outer skirt of the bell type insulator is deep, and the middle prism depth often exceeds the outer umbrella. External umbrella insulator There are no corner slots under the umbrella.

Dc wire ceramic, glass plate type Xian section, shape can be divided into bell cover (standard type), outside umbrella (including double umbrella, three umbrella). That is to say, for DC lines, the standard type insulator actually refers to the table cover insulator, because unlike AC lines, DC insulators require deeper corner slots, resulting in a higher external insulated flash voltage.

The pollution characteristics of insulators vary greatly with different umbrella types. According to the operating experience in Zhejiang area, for AC linear string insulators, the outer mountain type insulator has the least accumulation, and the general type of accumulated defects is about 2 times that of the outer mountain type insulator, and the bell type insulator accumulated defects is about 1.5 times that of the general type insulator. The above multiples are the average values under a large number of samples, and the difference in the fouling of umbrella insulators will vary greatly according to the specific tower position. There is not enough data on the effect of DC insulator umbrella type on fouling.

1.2 Internal Structure

(1- steel hat; 2- Ceramic parts; 3- Steel feet; 4-lock pin: 5-elastic pad; 6- Cement adhesive)

The steel cap and steel foot are used for the connection between insulators or between insulators and fittings, and the locking pin is used to fix the position after the connection between the steel foot and the steel cap to prevent the insulator from falling off.

Ceramic is the part responsible for the insulation function of the insulator, the ceramic inside the helmet is called the ceramic head, the part with the greatest electric field strength inside the insulator, and the material and design are the key to the insulation performance in the insulator.

Cement adhesive withstand the connection between ceramic parts and steel caps, is the key to the mechanical strength and insulation performance of insulators.

The structure of the AC plate suspended glass insulator is similar to that of the figure 3 insulator, but the ceramic has become a glass product.