Vacuum switching tube for protective circuit breaker of generator outlet

Abstract

The invention relates to a vacuum switching tube for a protective circuit breaker of a generator outlet, solving the problem that the conventional vacuum switching tube has low surface utilization rate and small capacity and can not satisfy great current breaking requirement. The vacuum switching tube for a protective circuit breaker of a generator outlet comprises a guiding sleeve, ceramic insulated shells, a composite shielded sleeve, a movable end pipe core, a static end pipe core and a protective cap, wherein the ceramic insulated shell is respectively connected with the movable end pipe core and the static end pipe core by kovars; the composite shielded sleeve is connected with the ceramic insulated shells at both ends; and the contact combinations of the movable end pipe core and the static end pipe core are corresponding to each other. The vacuum switching tube for a protective circuit breaker of a generator outlet is characterized in that either contact combination is in arc-distributed electrode structure and respectively comprises a cup seat, a supporting disk, a magnetism-concentrating column, a contact body and an oxygen-free copper tray; the composite shielded sleeve comprises an arc absorption inner layer and a magnetic shielded outer layer; and the surface of a static conductive rod is provided with radiation grooves. The invention has the advantages of reasonable structure, strong current breaking and closing capabilities, small loop resistance, uniform electrode surface combustion, high surface utilization rate and strong radiation capability.

Description

technical field [0001] The invention relates to a vacuum switch tube, in particular to a vacuum switch tube for breaking a large-capacity generator outlet protective circuit breaker. Background technique [0002] Vacuum switching tubes are the core components of vacuum switches (circuit breakers, contactors, load switches, etc.), and have been widely used in various industries of the national economy such as electric power, metallurgy, machinery, mining, transportation, national defense, military industry, scientific research, industry, and agriculture. It is an indispensable and important device for the development of the country; it is an updated product that replaces the traditional oil switch, and has significant advantages such as small size, light weight, large breaking capacity, high reliability and convenient maintenance; it has become a switch industry at home and abroad. direction of application development. The use of generator outlet protection circuit breakers ...

AI Technical Summary

Problems solved by technology

The existing vacuum switch tube is composed of a guide sleeve, a ceramic insulating shell, a stainless steel or oxygen-free copper shielding cylinder, a moving end die, a static end die and a protective cap. The existing problems are: 1. The contact is cup-shaped Longitudinal magnetic field structure, low surface utilization, can not meet the requirements of large current breaking; 2. The shielding cylinder is made of stainless steel or oxygen-free copper material, when breaking a large short-circuit current, it cannot eliminate the influence of the magnetic field generated by the phase-to-phase current on the arc , which is not conducive to breaking; 3. Although the static conductive rod of the static end tube core has a large diameter, the heating phenomenon is still serious when the large current is broken.

Therefore, the capacity of vacuum switch tubes currently used for generator outlet protection is not large, and it is difficult to meet the needs of localization.

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