CN117334541A - Active disconnection fuse and disconnection method - Google Patents
Active disconnection fuse and disconnection method Download PDFInfo
- Publication number
- CN117334541A CN117334541A CN202311629206.6A CN202311629206A CN117334541A CN 117334541 A CN117334541 A CN 117334541A CN 202311629206 A CN202311629206 A CN 202311629206A CN 117334541 A CN117334541 A CN 117334541A
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- fuse
- hole
- melt
- slot
- moving block
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000155 melt Substances 0.000 claims abstract description 51
- 238000010008 shearing Methods 0.000 claims abstract description 48
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 210000003739 neck Anatomy 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 239000011810 insulating material Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/0039—Means for influencing the rupture process of the fusible element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/042—General constructions or structure of high voltage fuses, i.e. above 1000 V
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
- H01H2085/0266—Structural association with a measurement device, e.g. a shunt
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
- H01H2085/386—Means for extinguishing or suppressing arc with magnetic or electrodynamic arc-blowing
Abstract
The invention relates to the technical field of high-voltage direct-current fuses, in particular to an active disconnection fuse and a disconnection method. The device comprises a protective shell, a melt and a breaking arc extinguishing assembly; the melt and the breaking arc extinguishing assembly are arranged in the protective shell, a narrow neck positioned in the through hole is arranged in the middle of the melt, and the breaking arc extinguishing assembly comprises an electromagnet lock, a shearing moving block and a power storage spring; the shearing moving block is arranged at the bottom of the melt, the power accumulating spring is arranged at the bottom of the shearing moving block and keeps an energy accumulating compression state, a second connecting hole is formed in one side of the shearing moving block, which faces the electromagnet lock, and the electromagnet lock is inserted into the second connecting hole; the operation of the breaking arc extinguishing assembly in the fuse is controlled by monitoring the working current state of the system, and the shearing moving block moves upwards, so that the fuse body is mechanically cut off to achieve the function of actively breaking the fuse.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current fuses, in particular to an active disconnection fuse and a disconnection method.
Background
The fuse is an electric appliance which fuses a melt by heat generated by the fuse when a current exceeds a predetermined value to open a circuit. The fuse melts the melt by the heat generated by the fuse after the current exceeds a specified value for a period of time, so that the circuit is disconnected; a current protector is made by applying the principle. The fuse is widely applied to high-low voltage distribution systems, control systems and electric equipment, is used as a protector for short circuit and overcurrent, and is one of the most common protection devices.
The fuse metal melt is an easily fusible conductor. When overload or short-circuit fault occurs in the circuit, the overload current or the short-circuit current heats the melt, and the melt is melted before the temperature of the protected equipment does not reach the temperature to damage the insulation of the protected equipment due to the fact that the temperature of the melt exceeds the melting point, so that the circuit is cut off, and the electrical equipment in the circuit is protected.
The fusing process of the fuse can be divided into four stages
1. The fuse melt heats up by overload current or short-circuit current, and the temperature of the fuse melt rises to the melting point of the alloy material of the fuse melt, but the fuse melt is still in a solid state and not melted yet.
2. The melt alloy metal starts to change from solid to plastic and liquid, and the melt temperature is kept at the melting point all the time, since the melt absorbs a part of the heat (heat of fusion) at this time.
3. The molten metal is heated continuously until its temperature reaches the melt vaporization point, this being the second heating stage.
4. The melt metal breaks, gaps appear, the gaps are broken down by the electric field to generate electric arcs, and the electric arcs are completely extinguished.
These four phases are actually two consecutive processes: the heat accumulation process before the arc is not generated and the arc process after the arc is generated by fusing. The solitary preceding process is characterized by heat generation and melting, that is, the function of the fuse in the process is what kind of reaction to the fault current. It is apparent that the greater the fault current, the faster the melt temperature rises and the shorter the pre-arc process. Conversely, the fault current is small, and the arc front process is naturally longer.
When the fault current is in an overload state, the smaller the overload current is, the longer the working pre-arc state of the fuse is, the longer the fuse is fused, and the system overload damage cannot be cut off in a short time.
At present, a fuse is a passive protection device which is used for safely breaking fault current under the specified voltage condition (voltage, time constant or power factor), line current passes through a melt, and a current sensing point (narrow neck) arranged on the melt is melted and disconnected in a stipulated time by utilizing a current heat accumulation effect, so that the fuse is in a fusing state and the fusing time which are both passive and are determined by circuit working current, and the fuse cannot protect components of the working circuit if the fusing time of the fuse is unreasonable in some current intervals.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an active breaking fuse and a breaking method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an active disconnect fuse, the fuse comprising:
the protection shell comprises a fuse upper cover, a fuse main body and a fuse bottom plate which are sequentially arranged from top to bottom, wherein the fuse main body is provided with a slot arranged along the horizontal direction, a through hole arranged along the vertical direction and a first cavity arranged at the bottom; the through hole is positioned in the middle of the fuse main body and vertically penetrates through the slot; wherein, a first connecting hole which is communicated with each other is arranged between the through hole and the first cavity;
the melt is arranged in the slot, and both ends of the melt are protruded out of the fuse main body; the middle part of the melt is provided with a narrow neck positioned in the through hole, and two ends of the narrow neck are protruded or positioned at the inner wall of the through hole;
the circuit breaking and arc extinguishing assembly comprises an electromagnet lock, a shearing moving block and a power accumulating spring; the shearing moving block and the power accumulating spring are both arranged in the through hole, the power accumulating spring is compressed at the bottom of the shearing moving block, the electromagnet is locked in the first cavity, and the electromagnet lock penetrates through the first connecting hole to be connected with the shearing moving block and limits the shearing moving block to move when connected;
wherein, the protective housing and the shearing movable block are both made of insulating materials.
Preferably, the electromagnet lock comprises a lock iron shell, a thimble protruding out of the lock iron shell and a control pin, one end of the thimble is inserted into the first connecting hole, and the other end of the thimble is connected with the control pin; the shearing movable block is arranged in the through hole, a second cavity is formed in the bottom of the shearing movable block, the force accumulating spring is arranged in the second cavity and keeps an energy accumulating compression state, a second connecting hole with the same height as the first connecting hole is formed in one side of the shearing movable block, which faces the electromagnet lock, and one end of the thimble is inserted into the first connecting hole and is inserted into the second connecting hole together.
Preferably, the slot comprises a first slot and a second slot, the first slot is arranged at the top of the fuse main body and is axially communicated with one side of the through hole, the second slot is arranged at the top of the fuse main body and is axially communicated with the other side of the through hole, and the communication paths of the first slot, the through hole and the second slot are Z-shaped; wherein, the shape of the melt arranged in the groove is Z-shaped.
Preferably, the narrow necks are arranged in a plurality and positioned in the middle of the Z-shaped melt, the narrow neck close to the first groove is positioned at the joint of the first groove and the through hole, and the narrow neck close to the second groove is positioned at the joint of the second groove and the through hole.
Preferably, the top of the shearing moving block is provided with a Z-shaped groove, and the narrow neck of the melt is arranged in the groove.
Preferably, the neck is made of an alloy material, and silver or tin can be used.
Preferably, the insulating material may be a ceramic or SMC or DMC high temperature resistant insulating material.
Preferably, the protection shell is provided with a plurality of vertically arranged bolts, the upper fuse cover, the fuse main body and the fuse bottom plate are connected through the bolts, and nuts are arranged on the bolts for fixing.
Preferably, the protection shell is provided with an exhaust hole and a wire outlet hole, and the control pins penetrate through the wire outlet hole.
Further, a method for actively disconnecting a fuse, the fuse control pin receiving a signal, the method comprising the steps of:
s1, detecting whether the main circuit current flowing through detection of a fuse is abnormal or not by a current sensor;
s2, when abnormality is detected, the fuse control pin receives a signal, so that the electromagnet lock starts to work and the thimble is driven to shrink;
s3, the force accumulating spring releases pressure under the action of elastic potential energy and jacks up the shearing moving block;
s4, shearing the melt by the shearing moving block in the jacking process;
s5, when the melt is sheared, the fuse breaks.
In summary, the invention has the following advantages:
the invention has the function of actively breaking the fuse, when the fuse works, the system monitors the current of the working loop of the fuse, when the current state exceeds the rated state, but the fuse is in a longer fusing time state in the current state, the system can control the actuation of the electromagnet lock, so that the fuse is actively broken, and when the fuse fails to fuse, the system can also be actively broken.
Drawings
FIG. 1 is a schematic diagram of a fuse structure;
FIG. 2 is an exploded schematic view of a fuse;
FIG. 3 is a schematic cross-sectional view of a fuse;
FIG. 4 is a perspective view of the structure of the fuse body;
FIG. 5 is a schematic view of the structure of the melt;
FIG. 6 is a perspective view of the structure of the shear block;
FIG. 7 is a schematic view of the structure of the melt after it has been cut;
FIG. 8 is a workflow diagram;
reference numerals: 1. a protective housing; 2. a melt; 4. an exhaust hole; 5. a wire outlet hole; 11. a fuse upper cover; 12. a fuse body; 13. a fuse base plate; 14. slotting; 15. a through hole; 16. a first cavity; 17. a first connection hole; 21. a narrow neck; 31. an electromagnet lock; 32. shearing the moving block; 33. a power storage spring; 101. a bolt; 102. a nut; 141. a first groove; 142. a second groove; 311. a lock iron shell; 312. a thimble; 313. a control pin; 321. a second cavity; 322. a second connection hole; 323. a groove.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
At the same time, it should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The following describes the embodiments of the present invention in detail with reference to the drawings.
As shown in fig. 1 to 2, an active disconnect fuse, the fuse comprising: protection casing 1, fuse-element 2 and circuit breaking arc extinguishing subassembly all set up in protection casing 1, surpass rated state at the current state of fuse, but under the state that the fuse-element fusing time is longer under this current state, circuit breaking arc extinguishing subassembly can initiatively cut off fuse-element 2 for the fuse also can initiatively form the circuit breaking when the unable fusing of trouble.
The structure of each component is shown in fig. 1 to 7; the protection casing 1 comprises a fuse upper cover 11, a fuse main body 12 and a fuse bottom plate 13 which are sequentially arranged from top to bottom, a plurality of vertically arranged bolts 101 are arranged on the protection casing 1, the fuse upper cover 11, the fuse main body 12 and the fuse bottom plate 13 are connected through the bolts 101, three components of the protection casing 1 are connected together, nuts 102 are arranged on the bolts 101, and the whole protection casing 1 is fixed.
Wherein, the fuse main body 12 is provided with a slot 14 arranged along the horizontal direction, a through hole 15 arranged along the vertical direction and a first cavity 16 arranged at the bottom; the through hole 15 is positioned in the middle of the fuse main body 12 and vertically penetrates through the slot 14; wherein, a first connecting hole 17 which is communicated with each other is arranged between the through hole 15 and the first cavity 16. When the fuse body 12 is connected to the fuse cover 11 and the fuse base 13, the slot 14 and the through hole 15 form a cavity in the protective housing 1, in which the melt 2 is arranged.
When the melt 2 is arranged, both ends of the melt 2 protrude from the fuse body 12, the middle part of the melt 2 is provided with a narrow neck 21 positioned in the through hole 15, and both ends of the narrow neck 21 protrude or are positioned at the inner wall of the through hole 15, so that the narrow neck 21 of the melt 2 is arranged to facilitate alignment of the circuit breaking and extinguishing components for shearing.
As shown in fig. 2, 4 and 5, regarding the specific structure of the narrow neck 21 of the fuse, the slot 14 is vertically penetrated by the through hole 15, so that the slot 14 is divided into two parts, specifically including a first slot 141 and a second slot 142, the first slot 141 is disposed at the top of the fuse body 12 and axially communicates with one side of the through hole 15, and the second slot 142 is disposed at the top of the fuse body 12 and axially communicates with the other side of the through hole 15; the communication paths of the first groove 141, the through hole 15 and the second groove 142 are zigzag, and the melt 2 disposed in the slot 14 is zigzag.
The necks 21 are provided in a plurality so that the melt 2 forms a multi-neck 21 structure, and the multi-neck 21 structure is positioned in the middle of the Z-shaped melt 2. At the junction of the first slot 141 and the through hole 15, the throat 21 near the first slot 141 is located at the junction of the second slot 142 and the through hole 15, and the throat 21 near the second slot 142 is located at the junction of the second slot 142 and the through hole 15.
When the fuse works normally and fuses, the multi-narrow neck 21 can fuse simultaneously to increase the separation distance of the melt 2, and the two ends of the Z-shaped melt 2 are parallel and separated by the inner fuse main body 12 and the breaking arc extinguishing component on the arc spraying straight line distance of the breaking point, so that the direct current arc extinguishing capability of the fuse is enhanced.
As shown in fig. 1 to 4 and 6, regarding a specific structure of the breaking arc extinguishing assembly, it includes an electromagnet lock 31, a shearing moving block 32, and a power spring 33; the electromagnet lock 31 is fixedly connected in the first cavity 16 through a screw or a screw rod, the electromagnet lock 31 comprises a lock iron shell 311, a thimble 312 protruding out of the lock iron shell 311 and a control pin 313, one end of the thimble 312 is inserted into the first connecting hole 17, and the other end of the thimble 312 is connected with the control pin 313.
The shearing moving block 32 is arranged in the through hole 15, a second cavity 321 is arranged at the bottom of the shearing moving block 32, the force accumulating spring 33 is arranged in the second cavity 321 and keeps an energy accumulating compression state, a second connecting hole 322 with the same height as the first connecting hole 17 is arranged on one side of the shearing moving block 32 facing the electromagnet lock 31, one end of the thimble 312 is inserted into the first connecting hole 17 and is inserted into the second connecting hole 322 at the same time, and at the moment, the electromagnet lock 31 limits the shearing moving block 32 through the thimble 312, so that the shearing moving block 32 always keeps a state of compressing the force accumulating spring 33.
The above description is described in detail with reference to the flow of fig. 8, when the controller controls the electromagnet lock 31, the ejector pin 312 of the electromagnet lock 31 is contracted, the up-down movement of the shearing moving block 32 is not limited any more, at this time, the shearing moving block 32 is rebounded by the compressed power storage spring 33, the shearing moving block 32 is quickly jacked up, the edge contacted with the melt 2 when the shearing moving block 32 moves is a right angle edge and a right angle edge of the groove 323 of the upper cover 11 of the fuse, as shown in fig. 7, the soft and weak part of the narrow neck 21 of the melt 2 is sheared, and the original passage of the melt 2 is blocked by the shearing moving block 32, so as to achieve the function of breaking and extinguishing arc.
Here, in order to enable the fuse to function normally, the protection case 1 and the shear block 32 are both made of an insulating material. And the insulating material can be ceramic or SMC or DMC high temperature resistant insulating material.
The narrow neck 21 is made of an alloy material, and silver or tin can be used.
A zigzag groove 323 is formed in the top of the shearing moving block 32, and the narrow neck 21 of the melt 2 is arranged in the groove 323, so that the melt 2 can be borne by the groove 323, and the narrow neck 21 before breaking can be better protected.
And grooves corresponding to the grooves 14 and the through holes 15 are provided on the fuse upper cover 11 to increase the spring height of the shear block 32 for better shearing of the melt 2.
The fuse electrical control pin 313 may receive a signal.
Regarding the opening method of an active opening fuse:
s1, detecting whether the main circuit current flowing through detection of a fuse is abnormal or not by a current sensor;
s2, when an abnormality is detected, the fuse control pin 313 receives a signal to enable the electromagnet lock 31 to start working and drive the thimble 312 to shrink;
s3, the force accumulating spring 33 releases pressure under the action of elastic potential energy and jacks up the shearing moving block 32;
s4, shearing the melt 2 by the shearing moving block 32 in the jacking process;
s5, when the melt 2 is sheared, the fuse breaks.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An active disconnect fuse, the fuse comprising:
the protection shell (1) comprises a fuse upper cover (11), a fuse main body (12) and a fuse bottom plate (13) which are sequentially arranged from top to bottom, wherein a slot (14) arranged along the horizontal direction, a through hole (15) arranged along the vertical direction and a first cavity (16) arranged at the bottom are arranged on the fuse main body (12); the through hole (15) is positioned in the middle of the fuse main body (12) and vertically penetrates through the slot (14); wherein a first connecting hole (17) communicated with each other is arranged between the through hole (15) and the first cavity (16);
the melt (2) is arranged in the slot (14), and two ends of the melt (2) are protruded out of the fuse main body (12); the middle part of the melt (2) is provided with a narrow neck (21) positioned in the through hole (15), and two ends of the narrow neck (21) are protruded or positioned at the inner wall of the through hole (15);
and a breaking arc extinguishing assembly comprising an electromagnet lock (31), a shearing moving block (32) and a power spring (33); the shearing moving block (32) and the power accumulating spring (33) are arranged in the through hole (15), the power accumulating spring (33) is compressed and arranged at the bottom of the shearing moving block (32), the electromagnet lock (31) is arranged in the first cavity (16), the electromagnet lock (31) penetrates through the first connecting hole (17) to be connected with the shearing moving block (32), and the shearing moving block (32) is limited to move during connection;
wherein, the protective shell (1) and the shearing moving block (32) are made of insulating materials.
2. An active disconnect fuse in accordance with claim 1, wherein the electromagnet lock (31) includes a lock iron housing (311), a thimble (312) protruding from the lock iron housing (311) and a control pin (313), one end of the thimble (312) is inserted into the first connection hole (17), and the other end of the thimble (312) is connected with the control pin (313); the shearing movable block (32) is arranged in the through hole (15), a second cavity (321) is formed in the bottom of the shearing movable block (32), the force accumulating spring (33) is arranged in the second cavity (321) and keeps an energy accumulating compression state, a second connecting hole (322) with the same height as the first connecting hole (17) is formed in one side, facing the electromagnet lock (31), of the shearing movable block (32), and one end of the thimble (312) is inserted into the first connecting hole (17) and is inserted into the second connecting hole (322) together.
3. An active disconnect fuse in accordance with claim 1, characterized in that the slot (14) comprises a first slot (141) and a second slot (142), the first slot (141) is provided at the top of the fuse body (12) and is axially connected to one side of the through hole (15), the second slot (142) is provided at the top of the fuse body (12) and is axially connected to the other side of the through hole (15), and the communication paths of the first slot (141), the through hole (15) and the second slot (142) are zigzag; wherein, the shape of the melt (2) arranged in the groove (14) is also Z-shaped.
4. An active break fuse as claimed in claim 3, characterized in that the necks (21) are provided in number and are located in the middle of the Z-shaped melt (2), the necks (21) near the first slot (141) being located at the junction of the first slot (141) and the through hole (15), the necks (21) near the second slot (142) being located at the junction of the second slot (142) and the through hole (15).
5. An active break fuse as claimed in claim 4, characterized in that the top of the shear block (32) is provided with a zigzag groove (323) and the neck (21) of the melt (2) is arranged in the groove (323).
6. An active disconnect fuse as claimed in claim 1, in which the neck (21) is of an alloy material, in particular silver or tin.
7. An active disconnect fuse in accordance with claim 1 wherein the insulating material is ceramic or SMC or DMC high temperature resistant insulating material.
8. An active disconnect fuse as defined in claim 1, wherein the protective housing (1) is provided with a plurality of vertically arranged bolts (101), the upper fuse cover (11), the fuse body (12) and the fuse base plate (13) are connected by the bolts (101), and nuts (102) are provided on the bolts (101) for fixing.
9. An active break fuse as claimed in claim 2, characterized in that the protective housing (1) is provided with a vent (4) and a wire outlet (5), the control pin (313) passing through the wire outlet (5).
10. A method of actively opening a fuse, wherein a fuse control pin (313) is receptive to a signal, the method comprising the steps of:
s1, detecting whether the main circuit current flowing through detection of a fuse is abnormal or not by a current sensor;
s2, when abnormality is detected, a fuse control pin (313) receives a signal, so that an electromagnet lock (31) starts to work and a thimble (312) is driven to shrink;
s3, releasing pressure by the power accumulating spring (33) under the action of elastic potential energy, and jacking up the shearing moving block (32);
s4, shearing the melt (2) by the shearing moving block (32) in the jacking process;
s5, when the melt (2) is sheared off, the fuse breaks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311629206.6A CN117334541B (en) | 2023-12-01 | 2023-12-01 | Active disconnection fuse and disconnection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|
| CN117334541B (en) | 2024-03-19 |
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