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Factors to be considered in the selection of GIS shell materials

Release time:

2024-03-21

(1) The GIS shell that bears the operation impact should be made of steel with high mechanical strength (such as boiler steel) as far as possible;(2) The three-phase common box bus barrel has smaller eddy current loss than the single-phase bus;(3) The welding performance of the steel shell is better than that of the aluminum shell;(4) The air tightness of the cast aluminum shell is difficult to control;(5) The design cost of the aluminum shell is generally about 20% more expensive than the steel (or tailor-welded stainless steel) shell with the same function. The dynamic sealing surface is divided into rotating sealing surface and sliding sealing surface according to the nature of the action. The rotating sealing surface is located on the driving arm of the isolating switch and the grounding knife switch, and the rotating range of the sealing gasket used on such sealing surface is about 76 °.

(1) The GIS shell that bears the operation impact should be made of steel with high mechanical strength (such as boiler steel) as far as possible;(2) The three-phase common box bus barrel has smaller eddy current loss than the single-phase bus;(3) The welding performance of the steel shell is better than that of the aluminum shell;(4) The air tightness of the cast aluminum shell is difficult to control;(5) The design cost of the aluminum shell is generally about 20% more expensive than the steel (or tailor-welded stainless steel) shell with the same function.
The dynamic sealing surface is divided into rotating sealing surface and sliding sealing surface according to the nature of the action. The rotating sealing surface is located on the driving crank arm of the isolating switch and the grounding knife switch. The rotating range of the sealing gasket used on this kind of sealing surface is about 76 °. In order to strengthen the sealing, three O-type sealing gaskets are used. From the point of view of field installation and leak detection, the sealing effect is satisfactory, but with the passage of time, the increase of the number of operations and the aging of the rubber, the sealing condition of this kind of sealing surface needs to be paid attention to, especially for the number of operations. The sliding sealing surface is located on the control rod of the circuit breaker. The sealing gasket section is "V" type, and the sealing surface is metal rod surface with high smoothness. The "V" type sealing ring has 4 channels, and the sealing is quite reliable and not easy to occur. Leakage.
Static sealing surface in the field installation of leak detection problems found more, static sealing surface leakage there are two main reasons: the existence of defects in the sealing gasket itself and the poor combination of the sealing surface.

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