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Drop-out fuse with load shedding current, and installation method thereof

A drop-out fuse and fuse technology, which is applied in the direction of circuits, electrical components, emergency protection devices, etc., can solve the problems of personal safety hazards for operators, ineffective arc extinguishing effect, and easy arc generation, etc., so as to improve products Quality, simple structure, and the effect of reducing potential safety hazards

Pending Publication Date: 2021-12-10
STATE GRID LIAONING ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing fuses can cut the load current, because the contacts are exposed in the air, it is easy to generate arcs during the opening and closing operation, and it is very easy to cause phase-to-phase short circuit, which brings unsafe hidden dangers to the personal safety of operators.
Although some fuses are equipped with arc extinguishing covers, the arc extinguishing effect is not obvious due to the material and installation process of the added arc extinguishing covers, and the above problems still cannot be avoided.

Method used

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  • Drop-out fuse with load shedding current, and installation method thereof
  • Drop-out fuse with load shedding current, and installation method thereof
  • Drop-out fuse with load shedding current, and installation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The present invention provides an embodiment, which is a drop-out fuse with load shedding current, such as figure 1 as shown, figure 1 is a structural schematic diagram of the present invention;

[0042] The present invention comprises a fuse base 3 , a first fuse 1 , a second fuse 2 , an upper metal part 4 and a lower metal part 5 . Wherein, the first fuse 1 and the second fuse 2 are connected and operated in parallel, and the two ends are respectively connected to the two ends of the fuse base 3 through the upper metal part 4 and the lower metal part 5 through bolts.

[0043] The two ends of the fuse base 3 are connected with galvanized iron parts with screw holes, which are cast integrally with the porcelain insulator. The iron piece at the upper end of the fuse base 3 is connected to the upper metal part 4 with a hexagonal bolt through the wire inlet end 6 of the fuse base, and the iron piece at the lower end of the fuse base 3 is connected and fixed through the o...

Embodiment 2

[0061] The present invention also provides another embodiment, which is a method for installing a drop-out fuse with load-shedding current.

[0062] Taking a distribution transformer with a capacity of 400kvar as an example, a drop-out fuse is selected as a protective device on the high-voltage side, and the following is combined figure 1 The specific implementation steps of the present invention are described, including:

[0063] Step 1. Selection of fuse fuse.

[0064] The capacity is 400kvar distribution transformer, its rated current I n =23.09A, so I 1n Choose 8A fuse.

[0065] The I 1n Indicates the rated current of the fuse of the first fuse, which is selected as less than 35% of the rated operating current of the high voltage side of the transformer.

[0066] The I 2n Indicates the second fuse fuse rated current, I 2n Choose a 40A fuse. According to the normal selection of the transformer operating regulations.

[0067] That is: the high-voltage side fuse of t...

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Abstract

The invention belongs to the technical field of power distribution electric appliance products, and particularly relates to a drop-out fuse with a load shedding current, and an installation method thereof. The fuse comprises a fuse base, a first fuse, a second fuse and a metal part, wherein the first fuse and the second fuse are connected in parallel for operation, and two ends of the first fuse and two ends of the second fuse are respectively connected with the fuse base through metal parts. The fuse has the advantages of being simple in structure, convenient to install and easy to operate, the quality of power distribution electric appliance products can be improved, potential safety hazards are reduced, and the personal safety of operators is guaranteed. The fuse can extinguish electric arcs through the auxiliary arc extinguishing tube, interphase short circuit and personal potential safety hazards of operators cannot be caused, the success rate of cutting off a load line by the fuse can be remarkably improved, and meanwhile, the working efficiency is also remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of power distribution electrical appliances, in particular to a drop-out fuse with load-shedding current and an installation method. Background technique [0002] Drop-out fuses are widely used in the high-voltage side of 10kV overhead distribution transformers or branch lines of distribution lines. They have the advantages of simple structure, low cost, wide application range, and obvious disconnection points. being widely used. [0003] Drop-out fuses are mainly used for short-circuit and overload protection of transformers and lines. Since a certain branch circuit needs power outage maintenance, in order to minimize the power outage scope, the fuse is required to have the function of load shedding current at the same time. Although the existing fuses can cut the load current, because the contacts are exposed in the air, it is easy to generate an arc during the opening and closing operation, which can ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H85/54H01H85/20H01H85/38H01H85/165H01H85/055
CPCH01H85/54H01H85/20H01H85/38H01H85/165H01H85/055
Inventor 李冰王飞鸣李斌赵义松郎福成吴晗序刘钧迪伊文龙
Owner STATE GRID LIAONING ELECTRIC POWER RES INST