CN214226856U

CN214226856U - 24kV and 36kV drop-out fuse

Info

Publication number: CN214226856U
Application number: CN202022735757.9U
Authority: CN
Inventors: 王洪禹; 李洪军
Original assignee: Dalian Insulator Group T&d Co ltd
Current assignee: Dalian Insulator Group T&d Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-09-17
Anticipated expiration: 2030-11-11

Abstract

A24 kV and 36kV drop-out fuse is characterized in that a fusion tube is arranged on one side of a composite insulator in parallel and is connected with the composite insulator through an upper contact and a lower contact at two ends; a fuse is connected between the upper contact and the lower contact within the fuse tube. The lower contact comprises a cam structural member, a torsion spring, a lower reed and a triangular support. When the short-circuit current is fused through the fuse wire, the upper and lower moving contacts of the fuse tube lose the fastening force of the fuse wire, and the fuse tube falls off rapidly, so that the circuit is disconnected. Because the upper end of the fusion tube is closed, the pressure in the fusion tube is rushed out from the lower end of the fusion tube after being increased sharply, and the rushed-out air flow blows electric arcs longitudinally to extinguish the electric arcs and cut off a fault section line or fault equipment. Meanwhile, the insulating part adopts a composite insulator, so that the cost can be reduced and the weight of a fuse can be reduced compared with the traditional porcelain insulator, and the performance and the pollution resistance are better.

Description

24kV and 36kV drop-out fuse

Technical Field

The utility model relates to a drop out fuse technical field.

Background

The drop-out fuse is a short-circuit protection switch most commonly used for distribution line branch lines and distribution transformers, has the characteristics of economy, convenience in operation, strong outdoor environment adaptability and the like, and is widely applied to primary sides of the distribution line and the distribution transformers for protection and equipment switching and switching operation. The power cut range can be reduced by installing the power distribution line branch line, and the power distribution line branch line has an obvious disconnection point. The isolating switch has the functions of an isolating switch, creates a safe operation environment for a maintenance section line and equipment, and protects the safety of maintenance personnel, so that the isolating switch is widely used at home and abroad.

Disclosure of Invention

The utility model discloses improved on the basis of current drop out fuse structure, its aim at can realize nimble drawing, close the operation, the fusion tube can fall rapidly when the short circuit fuse fuses simultaneously, and the broken string has created a safe operation environment for maintenance section circuit and equipment.

The utility model discloses drop out fuse's above-mentioned purpose is realized through following technical scheme:

a24 kV and 36kV drop-out fuse comprises a composite insulator, an upper contact, a lower contact, an operating ring, a fuse tube and a fuse wire;

the fusion tube is arranged on one side of the composite insulator in parallel and is connected with the composite insulator through an upper contact and a lower contact at two ends; in the fuse tube, the fuse wire is connected between the upper contact and the lower contact;

the upper contact comprises a rain-proof cover, an upper reed and a moving contact; the top ends of the rain-proof cover and the composite insulator are fastened together, one end of the upper reed is fastened on the rain-proof cover, and the moving contact is arranged below the rain-proof cover and is connected to the rain-proof cover through the upper reed; the operating ring is tightly connected with the moving contact;

the lower contact comprises a cam structural member, a torsion spring, a lower reed and a triangular bracket; the cam structural part is connected with the lower end of the fusion tube, and the triangular bracket and the lower end of the composite insulator are fastened together; the torsional spring cover is on the cam structure, and lower reed one end fastening is installed on the A-frame, and the cam on the cam structure passes through lower reed joint on the A-frame, is in the same place cam structure and A-frame joint through torsional spring and lower reed.

And a mounting plate is arranged in the middle of the composite insulator.

The fusion tube and the composite insulator form an inclined angle with the plumb line.

The moving contact is tightly propped against the rainproof cover through the upper reed, so that the upper contact is electrically connected with the top end of the composite insulator.

The fuse is tightly tied with the lower contact, and the torsion spring and the lower reed are in a tensioning state through the cam of the cam structural member, so that the lower contact is electrically connected with the composite insulator.

The upper contact also comprises an auxiliary hook and a connecting plate; the upper ends of the rain cover, the connecting plate and the composite insulator are fastened together, and the auxiliary hook is welded on the connecting plate.

The utility model has the advantages that:

the upper and lower contacts are divided into upper and lower moving contacts, and the melting tube is lined with an arc extinguishing tube. When the short-circuit current is fused through the fuse wire, the upper and lower moving contacts of the fuse tube lose the fastening force of the fuse wire, and the fuse tube falls rapidly under the action of the gravity of the fuse tube, the spring pieces of the upper and lower static contacts and the cam structure of the lower moving contact and the torsion spring, so that the circuit is disconnected. Because the upper end of the fusion tube is closed, the pressure in the fusion tube is rushed out from the lower end of the fusion tube after being increased sharply, and the rushed-out air flow blows electric arcs longitudinally to extinguish the electric arcs and cut off a fault section line or fault equipment.

Drawings

Fig. 1 is a schematic structural diagram of a 24kV and 36kV drop-out fuse of the present invention;

FIG. 2 is an enlarged partial view of the upper contact portion;

fig. 3 is a partially enlarged view of the lower contact portion.

In the figure: the device comprises a composite insulator 1, an upper contact 2, a rain cover 2-1, an upper reed 2-2, a moving contact 2-3, an auxiliary hook 2-4, a connecting plate 2-5, an operating ring 3, a fusion tube 4, a fuse 5, a lower contact 6, a cam structural member 6-1, a torsion spring 6-2, a lower reed 6-3, a triangular support 6-4 and a mounting plate 7.

Detailed Description

The utility model discloses drop out fuse concrete implementation scheme is introduced in detail below with the accompanying drawing:

as shown in fig. 1, the utility model discloses 24kV, 36kV drop out fuse, including composite insulator 1, upper contact 2, lower contact 6, operation ring 3, fusion tube 4 and fuse 5.

The fuse tube 4 is arranged on one side of the composite insulator 1 in parallel, forms an inclined angle with a plumb line, is connected with the composite insulator 1 through the upper contact 2 and the lower contact 6 at two ends, and the fuse wire 5 is connected between the upper contact 2 and the lower contact 6 in the fuse tube 4.

Referring to fig. 2, the upper contact 2 comprises a rain shield 2-1, an upper spring 2-2 and a movable contact 2-3. The rain cover 2-1 is fastened with the top end of the composite insulator 1. One end of the upper reed 2-2 is fastened on the rain cover 2-1 through a bolt, the moving contact 2-3 is arranged below the rain cover 2-1 and is connected on the rain cover 2-1 through the upper reed 2-2. The operating ring 3 is fixedly connected with the movable contacts 2-3. The upper contact 2 further includes an attachment hook 2-4 and a web 2-5. The upper ends of the rain cover 2-1, the connecting plate 2-5 and the composite insulator 1 are fastened together, and the auxiliary hook 2-4 is welded on the connecting plate 2-5. The auxiliary hook 2-4 and the connecting plate 2-5 are used for matching with an insulating pull-in rod during pull-in, are auxiliary appliances for pull-in, are equivalent to a fulcrum, pry the moving contact 2-3 and the upper reed 2-2 during switching-off, play a limiting role during switching-on, and cannot directly push the clamping position of the upper reed 2-2 due to overlarge force. The auxiliary hook 2-4 and the connecting plate 2-5 are irrelevant to the main work, and do not participate in the connection between the movable contact 2-3 and the upper reed 2-2 when the fuse works.

The overall function relationship of the upper contact 2 is as follows: when the composite insulator works, the operating ring 3 and the auxiliary hooks 2-4 are hooked by a special insulating pull-close rod, the moving contact 2-3 is pushed to the upper spring leaf 2-2, the moving contact 2-3 and the rainproof cover 2-1 are tightly pressed together under the action of the upper spring leaf 2-2, and the upper contact 2 is electrically connected with the top end of the composite insulator 1.

Referring to fig. 3, the lower contact 6 comprises a cam structural member 6-1, a torsion spring 6-2, a lower spring 6-3 and a triangular bracket 6-4. The cam structural member 6-1 is connected to the lower end of the fusion tube 4, and the triangular support 6-4 and the lower end of the composite insulator 1 are fastened together. The torsion spring 6-2 is sleeved on the cam structural member 6-1, one end of the lower reed 6-3 is fixedly arranged on the triangular support 6-4, the cam on the cam structural member 6-1 is clamped on the triangular support 6-4 through the lower reed 6-3, and the cam structural member 6-1 and the triangular support 6-4 are clamped together through the action of the torsion spring 6-2 and the lower reed 6-3.

The lower contact 6 has the following overall functional relationship: when the composite insulator works, the fuse 5 is tightly tied with the lower contact 6, and the torsion spring 6-2 and the lower reed 6-3 are in a tensioning state through the cam of the cam structural member 6-1, so that the lower contact 6 is electrically connected with the composite insulator 1. Once the line has a fault, the fuse wire 5 is fused, the tension of the torsion spring 6-2 and the lower reed 6-3 is released, the fuse tube falls, and the line is disconnected.

A mounting plate 7 is arranged in the middle of the composite insulator 1 and is used for fixedly mounting the composite insulator 1 on related facilities.

When the fuse is installed, the fuse 5 passes through the fuse tube 4, the upper end of the fuse is fixed on the movable contact 2-3 in the upper contact 2, and the lower end of the fuse is fastened with the lower contact 6. When the fuse protector works, the moving contact 2-3 of the upper contact 2 is pushed to the upper spring leaf 2-2, and the fusion tube 4 is firmly and tightly propped against the rain cover 2-1 under the action of the lower spring leaf 6-3 of the lower contact 6, the cam structural member 6-1 and the torsion spring 6-2, so that the access state of the fuse protector is maintained. When the drop-out fuse is installed on a line, the fusion tube 4 is installed in parallel with the composite insulator 1 and forms a certain inclination angle with a plumb line.

As the new design of the utility model, a reed and cam structure and a torsional spring are added at the upper and lower contacts. Above structure can realize nimble pulling, close the operation, and the fusion tube can drop rapidly when the short circuit fuse fuses simultaneously, breaks off the circuit, has protected the circuit and other circuit original papers to the insulator part adopts composite insulator, and weight is lighter, and performance and resistant dirt nature are better, can effective reduce cost.

Claims

1. The utility model provides a 24kV, 36kV drop out fuse which characterized in that: the fuse comprises a composite insulator (1), an upper contact (2), a lower contact (6), an operating ring (3), a fuse tube (4) and a fuse wire (5);

the fusion tube (4) is arranged on one side of the composite insulator (1) in parallel and is connected with the composite insulator (1) through an upper contact (2) and a lower contact (6) at two ends; in the fuse tube (4), a fuse wire (5) is connected between the upper contact (2) and the lower contact (6);

the upper contact (2) comprises a rain cover (2-1), an upper spring leaf (2-2) and a moving contact (2-3); the top end of the rain cover (2-1) is fastened with the top end of the composite insulator (1), one end of the upper reed (2-2) is fastened on the rain cover (2-1), the moving contact (2-3) is arranged below the rain cover (2-1) and is connected to the rain cover (2-1) through the upper reed (2-2); the operating ring (3) is fixedly connected with the moving contact (2-3);

the lower contact (6) comprises a cam structural part (6-1), a torsion spring (6-2), a lower reed (6-3) and a triangular support (6-4); the cam structural part (6-1) is connected to the lower end of the fusion tube (4), and the triangular support (6-4) and the lower end of the composite insulator (1) are fastened together; the cam structure is characterized in that a torsion spring (6-2) is sleeved on a cam structure member (6-1), one end of a lower reed (6-3) is fixedly installed on a triangular support (6-4), a cam on the cam structure member (6-1) is clamped on the triangular support (6-4) through the lower reed (6-3), and the cam structure member (6-1) and the triangular support (6-4) are clamped together through the torsion spring (6-2) and the lower reed (6-3).

2. A drop out fuse as claimed in claim 1, wherein: an installation plate (7) is arranged in the middle of the composite insulator (1).

3. A drop out fuse as claimed in claim 1, wherein: the fusion tube (4) and the composite insulator (1) form an inclined angle with the plumb line.

4. A drop out fuse as claimed in claim 1, wherein: the moving contact (2-3) is tightly propped against the rain cover (2-1) through the upper reed (2-2), so that the upper contact (2) is electrically connected with the top end of the composite insulator (1).

5. A drop out fuse as claimed in claim 1, wherein: the fuse (5) is tightly tied with the lower contact (6), and the torsion spring (6-2) and the lower reed (6-3) are in a tensioning state through the cam of the cam structural member (6-1), so that the lower contact (6) is electrically connected with the composite insulator (1).

6. A drop out fuse as claimed in claim 1 or 4, wherein: the upper contact (2) also comprises an auxiliary hook (2-4) and a connecting plate (2-5); the upper ends of the rain cover (2-1), the connecting plate (2-5) and the composite insulator (1) are fastened together, and the auxiliary hook (2-4) is welded on the connecting plate (2-5).