Back to results
US 4,678,878 AGranted
Gas pressure circuit breaker
AssigneeSiemens Aktiengesellschaft
InventorHelmut Beier
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSiemens Aktiengesellschaft
InventorHelmut Beier
Estimating the term…
In a gas pressure circuit breaker with two fixed contacts an insulation tube is in the path of the quenching gas flow during circuit breaking. The insulation tube is grooved internally and externally. Openings for the quenching gas flow are formed by intersection of the sufficiently deep inner and outer grooves at crossings. There results a ribbed body of low material intensity, which nevertheless is resistant to bending and torsion. Under mechanical (static and dynamic) and thermal stress the insulation tube exhibits a long life. The arc applying stress on the inner surface weakens the rib structure of the insulation tube comparatively little. The surface toward the arc has no web connections in the axial direction. Due to the resulting layering of insulating material and insulating or quenching gas, the resistance of the circuitbreaker to surface leakage current is increased.
A gas pressure circuit breaker comprising a break gap formed by two fixed contacts and having an insulation tube surrounding the gap at least at times and having sheath-side openings for the distribution of a quenching gas flowing into the break gap, the insulation tube being internally and externally grooved, the inner and outer grooves forming crossings and have a depth such that they penetrate each other at the crossings, thereby forming the openings.
Dependencies are inferred from the claim text.