A control method and system for an intelligent drop-out fuse

Abstract

The present invention relates to the field of fuses and discloses a control method and system for an intelligent drop-out type fuse, which effectively solves the current problem that when the fuse tube is loosened, the fuse tube may remain in place due to the large friction of the fuse tube, thereby poorly protecting the transformer. The method and system include an insulator, wherein a first fixing buckle is installed in the middle of the insulator, a mounting plate is installed on one side of the first fixing buckle, a bottom fixing assembly is installed at the bottom end of the insulator, and a top fixing assembly is installed at the top end of the insulator. The bottom fixing assembly includes a second fixing buckle installed at the bottom end of the insulator. According to the present invention, the electromagnet is powered off, the repulsive force of the electromagnet on the magnetic block disappears, the insertion rod is disengaged from the moving block, and the moving block is loosened, so that the moving block moves outward under the elastic force of the second spring, thereby pushing the moving block to move outward, thereby pushing the fuse tube to rotate downward, and facilitating the separation of the fuse tube from the second connecting block.

Description

Technical Field

[0001] The present invention belongs to the field of fuses, and in particular relates to a control method and system for an intelligent drop-out fuse. Background Art

[0002] Drop-out fuses are one of the most common electrical devices in power distribution systems, widely used on the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations. Their operating principle is that when a line short-circuit or overcurrent occurs, the fuse inside the fuse tube melts due to the high temperature, generating an arc. The steel paper tube lining the fuse tube, under the action of the arc, produces a large amount of gas. Since the upper end of the fuse tube is sealed, the gas is ejected to the lower end, blowing out the arc. As the fuse melts, the upper and lower moving contacts of the fuse tube lose their holding force. Under the action of the fuse tube's own weight and the upper and lower static contact springs, the fuse tube drops rapidly, breaking the circuit and disconnecting the faulty line or faulty equipment. Drop-out fuses are most commonly used in three-phase overcurrent protection switches for 10kV bench-type transformers. When the transformer loses a phase, they control the disconnection of the fuse tube, thereby protecting the transformer. However, they still have the following drawbacks:

[0003] When the fuse tube is loosened, due to the large friction of the fuse tube, the fuse tube may remain in place, thereby poorly protecting the transformer. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a control method and system for an intelligent drop-out fuse, which effectively solves the current problem that when the fuse tube is loosened, due to the large friction of the fuse tube, the fuse tube may remain in place, thereby poorly protecting the transformer.

[0005] To achieve the above object, the present invention provides the following technical solution: a control method for an intelligent drop-out fuse, comprising the following steps:

[0006] 1. The signal acquisition circuit collects the voltage information output by all three-phase drop-out fuses and transmits the collected data to the control system. The control system determines whether there is a phase loss in the 10kV line. If there is no phase loss, the system continues to operate normally. If there is a phase loss, the control system controls the electromagnet to cut off the power.

[0007] Second, after the electromagnet is powered off, the repulsive force of the electromagnet on the magnetic block disappears, causing the insertion rod and the moving block to disengage. The moving block moves outward under the elastic force of the second spring, pushing the fuse tube to rotate downward;

[0008] 3. After the top end of the fuse tube is loosened, the push rod moves outward under the elastic force of the first spring, and then pushes the rotating block to rotate outward through the first rotating rod, thereby pushing the fuse tube to rotate downward;

[0009] Fourth, after the insertion rod moves downward, since the push rod is adapted to the top groove, pressure is generated on the inclined surface of the top groove after the push rod moves downward, thereby pushing the rotating block to rotate, thereby pushing the fuse tube to rotate downward.

[0010] Preferably, an intelligent drop-out fuse includes an insulator, wherein a first fixing buckle is installed in the middle of the insulator, a mounting plate is installed on one side of the first fixing buckle, a bottom fixing assembly is installed at the bottom end of the insulator, and a top fixing assembly is installed at the top end of the insulator;

[0011] The bottom fixing assembly includes a second fixing buckle installed at the bottom end of the insulator, a first connecting block is installed on the side of the second fixing buckle away from the mounting plate, a swivel seat is installed on one side of the first connecting block, a rotating block is rotatably connected to the outer side of the swivel seat, a bottom fixing ring is installed at one end of the rotating block, a fuse tube is installed inside the bottom fixing ring, and a pushing unit is installed on the side of the first connecting block close to the swivel seat.

[0012] Preferably, the pushing unit includes a movable groove symmetrically opened inside the first connecting block, the movable block is slidably connected inside the movable groove, a push rod is installed on the side of the movable block close to the rotating seat, one end of the push rod is rotatably connected to the first rotating rod, the end of the first rotating rod close to the rotating block is rotatably connected to the rotating block, and the end of the first rotating rod close to the rotating block is inclined downward, and a first spring is installed on the other side of the movable block.

[0013] Preferably, the top fixing assembly includes a third fixing buckle installed on the top of the insulator, and a second connecting block is installed on the side of the third fixing buckle away from the mounting plate, a bottom groove is opened at the bottom end of the second connecting block, and a limiting plate is symmetrically installed inside the bottom groove, the two limiting plates are slidably connected to the moving block, the bottom end of the moving block is rotatably connected to the second rotating rod, and one end of the second rotating rod is rotatably connected to the fixed block, a top fixing ring is installed on one side of the fixed block, the top fixing ring is connected to the top of the fuse tube, a push block is provided on the side of the moving block away from the fuse tube, the push block is slidably connected between the two limiting plates, a second spring is installed on the side of the push block away from the moving block, and a fixing unit is installed inside the second connecting block.

[0014] Preferably, the fixing unit includes a base plate installed at the bottom end of the second connecting block, a slot is opened inside the base plate, an insertion rod is slidably connected inside the slot, a support plate is installed on the outside of the insertion rod, the support plate is located below the base plate, a third spring is installed on the top of the support plate, and the top of the third spring is fixedly connected to the base plate.

[0015] Preferably, a fixing hole is provided inside the moving block, and the insertion rod is clamped inside the fixing hole.

[0016] Preferably, a push rod is installed on the side of the insertion rod close to the rotating block, and a top groove is opened on the side of the rotating block close to the first connecting block. The top groove is arranged in a triangular shape, and the push rod is adapted to the top groove.

[0017] Preferably, an electromagnet is installed on the top of the second connecting block, and a magnetic block is installed at an equal angle on the bottom of the supporting plate. The magnetic block is adapted to the electromagnet, the electromagnet is externally connected to the circuit, and a signal acquisition circuit is provided on the insulator.

[0018] Preferably, the signal acquisition circuit includes a voltage transformer, an A / D conversion circuit, etc., collects the voltage information output by all three-phase drop-out fuses, transmits the collected data to the control system, and the control system controls the on-off of the electromagnet.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) In the present invention, by turning off the power to the electromagnet, the repulsive force of the electromagnet on the magnetic block disappears, the insertion rod is disengaged from the movable block, and the movable block is loosened, so that the movable block moves outward under the elastic force of the second spring, thereby pushing the movable block to move outward, thereby pushing the fuse tube to rotate downward, and facilitating the separation of the fuse tube from the second connecting block;

[0021] (2) In this invention, after the top of the fuse tube is loosened, the push rod moves outward under the elastic force of the first spring, and then the first rotating rod pushes the rotating block to rotate outward, thereby further pushing the fuse tube to rotate downward and disengage from the second connecting block, thereby improving the circuit protection effect;

[0022] (3) After the insertion rod of the invention moves downward, the push rod is adapted to the top groove, so that after the push rod moves downward, pressure is generated on the inclined surface of the top groove, thereby pushing the rotating block to rotate, thereby pushing the fuse tube to rotate downward, and then under the joint action of the second spring, the push rod and the push rod, the fuse tube is easily disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0024] In the attached figure:

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the fuse tube of the present invention;

[0027] Figure 3 This is a schematic diagram of the bottom fixing assembly structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the propulsion unit of the present invention;

[0029] Figure 5 This is a schematic diagram of the top fixing assembly structure of the present invention;

[0030] Figure 6 This is a structural diagram of the fixing unit of the present invention;

[0031] In the figure: 1, insulator; 2, first fixing buckle; 3, mounting plate; 4, bottom fixing assembly; 401, second fixing buckle; 402, first connecting block; 403, rotating seat; 404, rotating block; 405, bottom fixing ring; 406, pushing unit; 4061, movable groove; 4062, movable block; 4063, push rod; 4064, first rotating rod; 4065, first spring; 5, top fixing assembly; 501, third fixing buckle; 502, second connecting block; 50 3. Bottom slot; 504. Limit plate; 505. Moving block; 506. Push block; 507. Second spring; 508. Second rotating rod; 509. Fixed block; 510. Top fixing ring; 511. Fixed unit; 5111. Electromagnet; 5112. Bottom plate; 5113. Slot; 5114. Insert rod; 5115. Support plate; 5116. Third spring; 5117. Magnetic block; 5118. Fixing hole; 5119. Push rod; 51110. Top slot; 6. Fuse tube. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Embodiment 1, by Figures 1-6The present invention includes an insulator 1, a first fixing buckle 2 is installed in the middle of the insulator 1, a mounting plate 3 is installed on one side of the first fixing buckle 2, a bottom fixing assembly 4 is installed at the bottom end of the insulator 1, a top fixing assembly 5 is installed at the top of the insulator 1, and the bottom fixing assembly 4 includes a second fixing buckle 401 installed at the bottom end of the insulator 1, a first connecting block 402 is installed on the side of the second fixing buckle 401 away from the mounting plate 3, a rotating seat 403 is installed on one side of the first connecting block 402, the outer side of the rotating seat 403 is rotatably connected to a rotating block 404, a bottom fixing ring 405 is installed at one end of the rotating block 404, and a fuse is installed inside the bottom fixing ring 405. Regarding tube 6, a pushing unit 406 is installed on the side of the first connecting block 402 near the rotating seat 403. The pushing unit 406 includes a movable groove 4061 symmetrically arranged inside the first connecting block 402. A movable block 4062 is slidably connected inside the movable groove 4061. A push rod 4063 is installed on the side of the movable block 4062 near the rotating seat 403. One end of the push rod 4063 is rotatably connected to a first rotating rod 4064. The end of the first rotating rod 4064 near the rotating block 404 is rotatably connected to the rotating block 404, and the end of the first rotating rod 4064 near the rotating block 404 is tilted downward. A first spring 4065 is installed on the other side of the movable block 4062.

[0034] The top fixing assembly 5 includes a third fixing buckle 501 installed on the top of the insulator 1, and a second connecting block 502 is installed on the side of the third fixing buckle 501 away from the mounting plate 3. The bottom end of the second connecting block 502 is provided with a bottom groove 503, and a limit plate 504 is symmetrically installed inside the bottom groove 503. The two limit plates 504 are slidably connected to a moving block 505. The bottom end of the moving block 505 is rotatably connected to a second rotating rod 508. One end of the second rotating rod 508 is rotatably connected to a fixed block 509. A top fixing ring 510 is installed on one side of the fixed block 509. The fixed ring 510 is connected to the top of the fuse tube 6. A push block 506 is provided on the side of the moving block 505 away from the fuse tube 6. The push block 506 is slidably connected between the two limit plates 504. A second spring 507 is installed on the side of the push block 506 away from the moving block 505. A fixing unit 511 is installed inside the second connecting block 502. The fixing unit 511 includes a bottom plate 5112 installed at the bottom end of the second connecting block 502. A slot 5113 is opened inside the bottom plate 5112. A plug rod 5114 is slidably connected to the inside of the slot 5113. The plug rod 511 4 is installed with a supporting plate 5115, which is located below the bottom plate 5112. A third spring 5116 is installed on the top of the supporting plate 5115. The top of the third spring 5116 is fixedly connected to the bottom plate 5112. A fixing hole 5118 is opened inside the moving block 505. The insertion rod 5114 is clamped inside the fixing hole 5118. A top rod 5119 is installed on the side of the insertion rod 5114 close to the rotating block 404. A top groove 51110 is opened on the side of the rotating block 404 close to the first connecting block 402. The top groove 51110 is arranged in a triangular shape. shape, the top rod 5119 is adapted to the top groove 51110, an electromagnet 5111 is installed on the top of the second connecting block 502, and a magnetic block 5117 is installed at an equal angle to the bottom of the support plate 5115. The magnetic block 5117 is adapted to the electromagnet 5111, and the electromagnet 5111 is externally connected to the circuit. A signal acquisition circuit is provided on the insulator 1, and the signal acquisition circuit includes a voltage transformer, an A / D conversion circuit, etc., which collects the voltage information output by all three-phase drop-out fuses and transmits the collected data to the control system, which controls the on and off of the electromagnet 5111.

[0035] Working principle: The signal acquisition circuit collects the voltage information output by all three-phase drop-out fuses and transmits the collected data to the control system. The control system determines whether there is a phase loss in the 10kV line. If there is no phase loss, the control system continues to operate normally. If there is a phase loss, the control system controls the electromagnet 5111 to cut off the power, so that the repulsive force of the electromagnet 5111 on the magnetic block 5117 disappears, so that the insertion rod 5114 moves downward under the elastic force of the third spring 5116, so that the insertion rod 5114 leaves the fixing hole 5118 on the moving block 505, so that the moving block 505 is loosened, so that the moving block 505 moves outward under the elastic force of the second spring 507, thereby pushing the moving block 505 to move outward, thereby pushing the fuse tube 6 to rotate downward and disengage from the second connecting block 502.

[0036] When the fuse tube 6 is loosened, the push rod 4063 moves outward under the elastic force of the first spring 4065, and then pushes the rotating block 404 to rotate outward through the first rotating rod 4064, thereby further pushing the fuse tube 6 to rotate downward and disengage from the second connecting block 502, thereby improving the circuit protection effect;

[0037] When the insertion rod 5114 moves downward, a top rod 5119 is provided on one side of the insertion rod 5114, and the top rod 5119 is adapted to the triangular top groove 51110 provided on the rotating block 404. Therefore, after the insertion rod 5114 moves downward, the top rod 5119 moves downward, and then generates a thrust on the inclined surface of the top groove 51110, thereby pushing the fuse tube 6 to rotate downward and disengage from the second connecting block 502, thereby improving the circuit protection effect.

Claims

1. A control method for an intelligent drop-out fuse, characterized in that: The drop-out fuse comprises an insulator (1), a first fixing buckle (2) is installed in the middle of the insulator (1), a mounting plate (3) is installed on one side of the first fixing buckle (2), a bottom fixing assembly (4) is installed at the bottom end of the insulator (1), and a top fixing assembly (5) is installed at the top end of the insulator (1); The bottom fixing assembly (4) comprises a second fixing buckle (401) mounted on the bottom end of the insulator (1); a first connecting block (402) is mounted on a side of the second fixing buckle (401) away from the mounting plate (3); a rotating seat (403) is mounted on one side of the first connecting block (402); a rotating block (404) is rotatably connected to the outer side of the rotating seat (403); a bottom fixing ring (405) is mounted on one end of the rotating block (404); a fuse tube (6) is mounted inside the bottom fixing ring (405); and a pushing unit (406) is mounted on a side of the first connecting block (402) close to the rotating seat (403); The pushing unit (406) comprises a movable groove (4061) symmetrically arranged inside the first connecting block (402); a movable block (4062) is slidably connected inside the movable groove (4061); a push rod (4063) is installed on one side of the movable block (4062) close to the rotating seat (403); one end of the push rod (4063) is rotatably connected to the first rotating rod (4064); one end of the first rotating rod (4064) close to the rotating block (404) is rotatably connected to the rotating block (404), and one end of the first rotating rod (4064) close to the rotating block (404) is tilted downward; and a first spring (4065) is installed on the other side of the movable block (4062); The top fixing assembly (5) comprises a third fixing buckle (501) mounted on the top of the insulator (1); a second connecting block (502) is mounted on a side of the third fixing buckle (501) away from the mounting plate (3); a bottom groove (503) is provided at the bottom end of the second connecting block (502); limiting plates (504) are symmetrically mounted inside the bottom groove (503); a moving block (505) is slidably connected to the two limiting plates (504); a pushing block (506) is provided on a side of the moving block (505) away from the fuse tube (6); the pushing block (506) is slidably connected between the two limiting plates (504); a second spring (507) is mounted on a side of the pushing block (506) away from the moving block (505); and a fixing unit (511) is mounted inside the second connecting block (502); The fixing unit (511) comprises a bottom plate (5112) mounted on the bottom end of the second connecting block (502), a slot (5113) is provided inside the bottom plate (5112), and an inserting rod (5114) is slidably connected inside the slot (5113); A top rod (5119) is installed on the side of the insertion rod (5114) close to the rotating block (404), and a top groove (51110) is opened on the side of the rotating block (404) close to the first connecting block (402). The top groove (51110) is arranged in a triangular shape, and the top rod (5119) is adapted to the top groove (51110). An electromagnet (5111) is installed on the top of the second connecting block (502), and a magnetic block (5117) is installed at an equal angle on the bottom of the supporting plate (5115). The magnetic block (5117) is adapted to the electromagnet (5111), and the electromagnet (5111) is externally connected to a circuit. A signal acquisition circuit is provided on the insulator (1); The control method of the intelligent drop-out fuse comprises the following steps:

1. The signal acquisition circuit collects the voltage information output by all three-phase drop-out fuses and transmits the collected data to the control system. The control system determines whether there is a phase loss in the 10kV line. If there is no phase loss, the control system continues normal operation. If there is a phase loss, the control system cuts off the power by controlling the electromagnet (5111); Second, after the electromagnet (5111) is powered off, the repulsive force of the electromagnet (5111) on the magnetic block (5117) disappears, causing the insertion rod (5114) to be disengaged from the movable block (505). The movable block (505) moves outward under the elastic force of the second spring (507), pushing the fuse tube (6) to rotate downward; 3. After the top end of the fuse tube (6) is loosened, the push rod (4063) moves outward under the elastic force of the first spring (4065), and then pushes the rotating block (404) to rotate outward through the first rotating rod (4064), thereby pushing the fuse tube (6) to rotate downward; Fourth, after the insertion rod (5114) moves downward, the top rod (5119) is adapted to the top groove (51110), so that after the top rod (5119) moves downward, pressure is generated on the inclined surface of the top groove (51110), thereby pushing the rotating block (404) to rotate, thereby pushing the fuse tube (6) to rotate downward.

2. The control method of an intelligent drop-out fuse according to claim 1, characterized in that: The bottom end of the movable block (505) is rotatably connected to a second rotating rod (508), one end of the second rotating rod (508) is rotatably connected to a fixed block (509), one side of the fixed block (509) is provided with a top fixing ring (510), and the top fixing ring (510) is connected to the top end of the fuse tube (6).

3. The control method of an intelligent drop-out fuse according to claim 1, characterized in that: A support plate (5115) is installed on the outside of the insertion rod (5114), and the support plate (5115) is located below the bottom plate (5112). A third spring (5116) is installed on the top of the support plate (5115), and the top of the third spring (5116) is fixedly connected to the bottom plate (5112).

4. The control method of an intelligent drop-out fuse according to claim 1, characterized in that: A fixing hole (5118) is provided inside the moving block (505), and the insertion rod (5114) is clamped inside the fixing hole (5118).

5. A system for controlling an intelligent drop-out fuse according to any one of claims 1 to 4, characterized in that: The signal acquisition circuit includes a voltage transformer and an A / D conversion circuit, collects voltage information output by all three-phase drop-out fuses, transmits the collected data to a control system, and the control system controls the on-off of the electromagnet (5111).

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