Twice power transmission self-recovery fuse
A fuse and self-recovery technology, applied in circuits, electrical components, emergency protection devices, etc., can solve problems such as hidden safety hazards, manual closing, trouble, etc., to improve safety and reduce labor waste.
Active Publication Date: 2020-10-02
国网甘肃省电力公司兰州供电公司
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Problems solved by technology
In this process, in order to ensure the response of the latter, it is necessary to add parallel resistors at both ends of the former, so that the operating current required for tripping can be provided to the latter after a circuit fault. The application circuit is complex and the equipment cost is high.
[0004] The electrical connection usually requires secondary power transmission to avoid accidentally injuring the maintenance personnel on the lower branch during the power transmission process, and the self-resetting fuse does not have the process of secondary power transmission when the power supply is restored. Therefore, if the self-resetting fuse is connected in series If there are other switching circuits, manual closing is still required, which is troublesome. If there are no other circuit switches in series, there will be a greater safety hazard
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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0023] see Figure 1-5 , a self-resetting fuse for secondary power transmission, including a housing 1, the housing 1 is made of austenitic stainless steel, a beryllium oxide ceramic core is embedded in the center of the housing 1, and a glass body is filled between the stainless steel and the ceramic core. Sealing and strong ceramic core, both ends of the shell 1 are provided with terminal electrodes 2, between the two terminal electrodes 2 are provided with ...
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The invention relates to the technical field of electrical safety, and discloses a twice power transmission self-recovery fuse which comprises a housing. End electrodes are arranged at the two ends ofthe housing; a fusing cavity, an energy storage piston and an air cavity are sequentially arranged between the two end electrodes; and the energy storage piston comprises a first plunger and a secondplunger. The twice power transmission self-recovery fuse can be quickly fused and recovered when abnormal current passes through the fuse for the first time; when the abnormal current passes throughthe fuse for the second time, the reset is stuck, so that repeated power-on and power-off are avoided; in addition, the reset of the ejector rod is set in a time-delay manner, so that the second abnormal current within the preset time will trigger permanent power off, and workers are reminded of finding the fault; and the energy storage cavity absorbs potential energy released when the fusing cavity is gasified, and the potential energy is released when the energy storage piston is reset, so that a brief power outage is realized, power transmission is conducted twice in the power recovery process, and maintenance personnel of a lower-level line can obtain early warning and disengage from contact in time during primary power supply.
Description
technical field [0001] The invention relates to the technical field of electrical safety, in particular to a self-resetting fuse for secondary power transmission. Background technique [0002] like Image 6 As shown, the existing self-resetting fuse mainly consists of electrodes, melt, piston and argon-filled cavity. Under normal working conditions, the melt resistance is small and a current path is formed. Sodium is vaporized into a plasma state, and the resistance increases sharply, which acts as a strong current limiter. After the temperature recovers, the argon pushes the piston to compress the metal sodium, and the metal sodium returns to liquid or solid state, and the circuit is reconnected. [0003] From the above process, it can be seen that if the fault of the load circuit is not eliminated, the self-resetting fuse will continue to repeatedly turn on and off the circuit. In order to avoid this phenomenon, the self-resetting fuse will be used in conjunction with othe...
Claims
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IPC IPC(8): H01H85/05
CPCH01H85/05
Inventor 陈垠杰
Owner 国网甘肃省电力公司兰州供电公司