CN212032977U - Quick circuit breaker and novel drop-out quick breaker - Google Patents
Quick circuit breaker and novel drop-out quick breaker Download PDFInfo
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- CN212032977U CN212032977U CN202021066770.3U CN202021066770U CN212032977U CN 212032977 U CN212032977 U CN 212032977U CN 202021066770 U CN202021066770 U CN 202021066770U CN 212032977 U CN212032977 U CN 212032977U
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- circuit breaker
- insulating shell
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Abstract
The invention relates to a quick breaker and a novel drop-out breaker, wherein the novel drop-out breaker comprises a base, a drop-out mechanism and a quick breaker, and the quick breaker comprises a separable conductive piece structure, a pushing mechanism and a detection control module. The invention has the advantages of simple structure, reliable work and instantaneous circuit break.
Description
Technical Field
The utility model relates to a circuit breaker, especially a quick circuit breaker and drop-out quick-breaking device based on vacuum arc extinguishing technique.
Background
At present, a drop-out fuse is installed in a medium-low voltage distribution line and a distribution transformer to serve as a short-circuit protection switch, the power failure range can be reduced, the drop-out fuse has an obvious disconnection point and has the function of an isolating switch, a safe operation environment is created for lines and equipment at an overhaul section, and the safety of overhaul personnel is improved. The protection circuit is installed on a distribution transformer, can be used as the main protection of the distribution transformer and is commonly used in medium and high voltage distribution lines and distribution transformers.
The drop-out fuse has the working principle that moving contacts at two ends of a fuse tube are tied tightly by means of a fuse wire (melt), and after the upper moving contact is pushed into a duckbill-shaped protruding part, an upper fixed contact made of phosphor copper sheets and the like is propped against the upper moving contact, so that the fuse tube is firmly clamped in the duckbill shape. When short-circuit current is blown out through the fuse wire, an electric arc is generated, and a copper paper tube lined in the fuse wire tube generates a large amount of gas under the action of the electric arc. Because the upper end of the fuse tube is sealed, the gas is sprayed out to the lower end to blow out the electric arc. As the fuse wire is fused, 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 and the spring pieces of the upper and lower static contacts, so that a circuit is disconnected, and a fault section line or fault equipment is cut off.
There are problems with the use of such drop-out fuses:
1. when a short-circuit fault occurs in the rear-stage equipment, the time before the melt is switched off is long, and the situation that the melt cannot be fused before the fault current is cut off by the outgoing line switch of the transformer substation can be greatly caused, so that the fault point cannot be correctly isolated by the drop-out fuse, the fault equipment is short-circuited again when the circuit is reclosed, the circuit reclosing failure is caused, and the whole line is powered off.
2. The arc extinguishing medium and the gas generating material on the inner wall of the melting tube influence the arc extinguishing medium, the gas generating amount is less, the speed is low, and the arc cannot be effectively blown and cooled when the arc is generated, so that the arc extinguishing capability is poor.
3. The drop-out fuse is generally installed outdoors and is influenced by the wind and rain of the natural environment, an arc extinguishing pipe in a fusion pipe is easy to damp and expand, and the inner diameter is reduced or blocked. When a fault occurs, the fuse wire is blown, but because the inner diameter of the arc extinguishing pipe is reduced or the arc extinguishing pipe is blocked, the blocked part can clamp the blown fuse wire connecting lead, so that the fuse pipe still keeps the original state for a long time when the fuse wire is blown, the fuse pipe cannot fall off quickly, the electric arc is not cut off in the fuse pipe, and finally continuous electric arc occurs, so that the fuse pipe is burned out, the circuit reclosing failure is caused, and the whole line is powered off.
Therefore, measures are necessary to cut off and isolate fault points as quickly and reliably as possible so as to guarantee the operation of the power grid. When a short-circuit fault occurs, the fuse reliably cuts off a fault line before the transformer substation outlet switch starts reclosing (usually 60ms), so that the transformer substation outlet switch is successfully closed, and a fault-free line can normally supply power and is not influenced by the fault line.
Firstly, the fracture forming mode can be changed through proper design, the fault line can be reliably and quickly disconnected, and secondly, the current abnormity can be more accurately monitored more quickly by means of a proper sensor.
In order to realize the disconnection of the fault line within 60ms, a mode of cutting off the fault line by cutting off a fuse wire to form a fracture by pushing a cutting knife to move through explosive explosion appears. The mode cuts off the fuse wire in the air, the arc is very easy to be drawn under the high-voltage environment, the arc burning time is too long, the fault current cannot be completely cut off, meanwhile, the arc drawing can generate high temperature, explosion and naked fire can occur, the equipment is damaged or fire disaster occurs, if the arc is to be timely extinguished, the technical difficulty is high, and the cost is high.
CN200820028343.9 discloses a cutting isolation device based on the principle of gunpowder explosion, which directly blows fuse by gunpowder to achieve the effect of quick cutting.
The patent adopts a mode of directly blasting fuse wires by the power of gunpowder explosion, though the method is direct and rapid, the gunpowder is arranged on the guide bar, under the influence of an electromagnetic field generated by changed large current, the gunpowder explosion can be caused, the misoperation is caused, the guide bar can generate heat under the action of the changed large current, and the gunpowder explosion can also be caused, so the misoperation is caused; the whole device is disabled, causing serious losses. The fracture is formed by the mode of exploding and turning the diversion row, the required space is large, and the volume of the product is overlarge. In addition, after the switch is exploded, the whole switch needs to be replaced, and the use cost is too high.
SUMMERY OF THE UTILITY MODEL
The problem to prior art exists, the utility model provides a quick circuit breaker and drop-out quick-breaking device who contains this quick circuit breaker, it can be fast (in 25 ms), accurate, reliably cut off the fault line, can effectively prevent the transformer substation outgoing line switch combined floodgate failure, make the trouble-free line can normally supply power, do not receive the influence of fault line, improve device fail safe nature and economic nature, can be applied to medium and low voltage distribution lines branch line and distribution transformer's the protection of opening a circuit.
The utility model adopts the technical proposal that:
a quick breaker comprises a separable conductive piece structure, a pushing mechanism and a detection control module;
the separable conductive structure comprises an insulating shell, a fixed contact and a movable contact, wherein a vacuum cavity is arranged in the insulating shell, one ends of the fixed contact and the movable contact are electrically contacted in the vacuum cavity, the other end of the fixed contact is electrically connected with a conductive rod arranged on the insulating shell, and the other end of the movable contact extends out of the insulating shell;
the pushing mechanism includes: the cylinder body and the piston are arranged in the insulating shell and can be moved by the piston, the top of the cylinder body is provided with a thrust generator, the piston is provided with a thrust rod, the end part of the thrust rod extends out of the insulating shell and is connected with a connecting plate, and the other end of the connecting plate is connected with the moving contact.
According to the scheme, the insulation shell is further provided with a limiting pipe, and the thrust rod penetrates through the limiting pipe.
According to the scheme, the axis of the piston is parallel to the axis of the movable contact.
According to the above scheme, still include spacing structure, on insulating casing was installed through the pivot to the one end of spacing structure, be provided with the torsional spring in the pivot, made spacing structure and even board contact, spacing structure is provided with the spacing groove with one side of even board contact, even the board can block in the spacing groove under the promotion of distance rod.
According to the scheme, the thrust generator is a gas generator or an electromagnetic valve.
According to the scheme, the movable contact is provided with the pressure spring, and the movable contact and the fixed contact are pressed and electrically contacted through the pressure spring.
According to the scheme: still including falling the release mechanism, including fixing the base lever on the shell, rotate with the base lever and be connected the rocker, the rocker tip is provided with the couple, is provided with the oval hole on the rocker, the oval hole of rocker and the round pin axle swing joint of setting at the moving contact tip, the couple of rocker tip can hang the lock plate that falls the mechanism, prevents to fall the mechanism and loosens.
According to the scheme, two insulating rings are arranged in the contact area of the thrust rod and the insulating shell.
A novel drop-out quick breaker comprises a base, a drop-out mechanism and a quick breaker, wherein the quick breaker is any one of the quick breakers.
The action principle of the utility model lies in:
1. the detection control module collects a line current signal through the current transformer and detects and judges a current peak value (or an effective value). When the line has overload or short circuit fault and the current exceeds the set fixed value, the detection control module sends out a driving signal, the thrust generator generates thrust to push the piston to move downwards, the thrust rod synchronously moves downwards under the driving of the piston, the thrust of the thrust rod is transmitted to the moving contact through the connecting plate, and the moving contact synchronously moves downwards, so that the moving contact and the static contact are separated to realize power failure.
2. The moving contact drives the rocker anticlockwise rotation when moving downwards, and the couple at rocker tip is no longer spacing lock plate to the messenger falls the mechanism and loosens, and the right half (conducting rod, detachable conducting structure, pushing mechanism etc.) of falling formula quick-witted overturns under the effect of gravity, realizes visual fracture.
3. The thrust rod moves downwards and simultaneously drives the connecting plate to move downwards synchronously, and the connecting plate can be clamped into the limiting groove of the limiting structure because the limiting mechanism is close to the connecting plate under the action of the torsion spring, so that the moving contact can be effectively prevented from returning to be in electrical contact with the static contact, and the situation that the moving contact is damaged due to overlarge displacement of the moving contact caused by overlarge thrust generated by the thrust generator can also be prevented.
The utility model discloses a technical advantage lies in:
1. the drop-out type quick breaker is arranged on a branch line of a medium-low voltage distribution line, when overload or short-circuit fault occurs, the fault line is reliably disconnected within 25ms, and the condition that a reclosing switch of a superior breaker switch fails to cause large-area power failure is avoided;
2. after the circuit is in fault, a product fracture is formed in the vacuum arc-extinguishing chamber, the arcing time is extremely short (within 10 ms), the product cannot generate electric arc, high-temperature gas and other substances in the air, the electric fire and the electric explosion are avoided, and the environment is not polluted;
3. the product adopts a detection control circuit to monitor and control the current in the circuit, the reaction sensitivity is high, and the control is accurate; the product action conditions can be set according to the requirements of users;
4. the falling mechanism adopts a falling mechanism and a base of the traditional falling fuse, has mature matching technology and is directly replaced, has the characteristic of visual fracture of the traditional falling fuse, and can be observed by naked eyes of maintenance workers;
5. due to the arrangement of the limiting structural part, after the connecting plate moves downwards to a certain position, the limiting structural part rotates around the shaft anticlockwise under the action of the torsion spring, the connecting plate is blocked by the lower end face of the limiting groove of the rotating limiting structural part after moving to the certain position, the downward movement is stopped, the moving contact moves back upwards under the action of the pressure spring, the phenomenon that the moving contact moves over a stroke to cause air leakage of the vacuum tube is prevented, the fracture is caused to be arc-broken, and the time for cutting off the current is prolonged; after the connecting plate retreats to a certain position, the connecting plate is clamped by the upper end face of the limiting groove of the rotating limiting structural member, the moving contact stops, the moving contact and the static contact form a stable safe distance, and the fault current is reliably cut off;
6. because the limiting pipe is arranged, the thrust rod is prevented from being deviated in the moving process to damage the cylinder body, and the same direction of the force transmitted to the moving contact by the connecting plate and the thrust of the thrust rod is also ensured.
7. The whole structure is simple, tight and reliable.
Drawings
Fig. 1 is a simplified structure of the drop-out type quick-break apparatus of the present invention;
fig. 2 is a simplified structural diagram (partially cut away) of the drop-out quick-break apparatus of the present invention;
FIG. 3 is a simplified structure of the fast circuit breaker of the present invention;
FIG. 4 is a partial view of FIG. 3A;
FIG. 5 is an enlarged view of a portion of FIG. 2;
fig. 6 is a schematic diagram of the circuit structure of the detection control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 to 6 specifically show the structural features of the present patent, and the following specifically describes an embodiment of the present invention with reference to fig. 1 and 6.
A novel drop-out type quick breaker comprises a base 100, a drop-out mechanism 200 and a quick breaker 300.
The quick circuit breaker 300 comprises a separable conductive piece structure, a pushing mechanism and a detection control module; the separable conducting structure comprises an insulating shell 11, a fixed contact 10 and a moving contact 8, wherein a vacuum cavity 9 is arranged in the insulating shell 11, one ends of the fixed contact 10 and the moving contact 8 are electrically contacted in the vacuum cavity 9, the other end of the fixed contact 10 is electrically connected with a conducting rod 19 arranged on the insulating shell 11, and the other end of the moving contact 8 extends out of the insulating shell 11;
the pushing mechanism includes: the piston type air compressor is characterized in that the cylinder body 3 and the piston 2 which can be moved by the piston 2 are arranged in the insulating shell 11, the top of the cylinder body 3 is provided with a thrust generator 1, the piston 2 is provided with a thrust rod 4, the end part of the thrust rod 4 extends out of the insulating shell 11 to be fixedly connected with a connecting plate 6, and the other end of the connecting plate 6 is fixedly connected with the moving contact 8.
According to the scheme, the insulation shell 11 is further provided with a limiting pipe 18, and the thrust rod 4 penetrates through the limiting pipe 18.
According to the scheme, the axis of the piston 2 is parallel to the axis of the movable contact 8.
According to the above scheme, still include limit structure 13, on insulating casing 11 was installed through the pivot to limit structure 13's one end, be provided with torsional spring 12 in the pivot, make limit structure 13 and even board 6 close contact, limit structure 13 is provided with the spacing groove with even one side of board 6 contact, even board 6 can block in the spacing inslot under the promotion of distance rod 4.
According to the above scheme, the thrust generator 1 is a gas generator or an electromagnetic valve, and the thrust generator 1 in this embodiment is a gas generator.
According to the scheme, the moving contact 8 is provided with the pressure spring 7, and the moving contact 8 and the static contact 10 are pressed and electrically contacted through the pressure spring 7.
According to the scheme: the anti-falling unlocking mechanism comprises a base rod 17 fixed on an insulating shell and a rocker 16 rotationally connected with the base rod 17, a hook is arranged at the end of the rocker 16, a waist round hole is formed in the rocker 16, the waist round hole of the rocker is movably connected with a pin shaft 15 arranged at the end of the movable contact 8, the hook at the end of the rocker 16 can hook a locking piece 14 of the falling mechanism, and the falling mechanism is prevented from loosening.
According to the scheme, two insulating rings 5 are arranged in the contact area of the thrust rod 4 and the insulating shell.
The detection control module comprises a power taking module, a current measuring module, a control module, a driving module and a communication module.
The electricity taking module obtains energy from the power transmission line by using a special electricity taking coil, and provides a stable working power supply and a driving power supply for the system. The current measuring module monitors the line current in real time, and when a fault occurs, the line current exceeds a set action fixed value, and the module outputs an action signal. The control module adjusts the action signal output by the current measuring module into a regular control signal. The driving module receives the control signal, and the driving thrust generator rapidly generates thrust to push the piston to move, so that the fault line is rapidly disconnected, and then the quick-break device falls off to form an obvious breakpoint, thereby achieving the purpose of cutting off the fault current. The power-on protection module is used for avoiding the exciting current generated when the circuit is powered on.
The communication module can communicate with a master station or specific equipment and upload the opening and closing states of the quick breaker; uploading line states such as line current and the like; receiving an instruction, remotely controlling the quick breaker to open the gate and the like.
Claims (9)
1. The utility model provides a quick circuit breaker, includes electrically conductive piece structure of detachable, pushing mechanism and detection control module, its characterized in that:
the separable conductive structure comprises an insulating shell, a fixed contact and a movable contact, wherein a vacuum cavity is arranged in the insulating shell, one ends of the fixed contact and the movable contact are electrically contacted in the vacuum cavity, the other end of the fixed contact is electrically connected with a conductive rod arranged on the insulating shell, and the other end of the movable contact extends out of the insulating shell;
the pushing mechanism includes: the cylinder body and the piston are arranged in the insulating shell and can be moved by the piston, the top of the cylinder body is provided with a thrust generator, the piston is provided with a thrust rod, the end part of the thrust rod extends out of the insulating shell and is connected with a connecting plate, and the other end of the connecting plate is connected with the moving contact.
2. The quick circuit breaker according to claim 1, characterized in that: and the insulating shell is also provided with a limiting pipe, and the thrust rod penetrates through the limiting pipe.
3. The quick circuit breaker according to claim 1, characterized in that: the axis of the piston is parallel to the axis of the movable contact.
4. Fast circuit breaker according to claim 1, 2 or 3, characterized in that: still include spacing structure, on insulating casing was installed through the pivot to the one end of spacing structure, be provided with the torsional spring in the pivot, made spacing structure and even board contact, spacing structure is provided with the spacing groove with one side of even board contact, even the board can block in the spacing inslot under the promotion of distance rod.
5. The quick circuit breaker according to claim 1, characterized in that: the thrust generator is a gas generator or a solenoid valve.
6. The quick circuit breaker according to claim 1, characterized in that: and a pressure spring is arranged on the movable contact, and the movable contact and the fixed contact are pressed and electrically contacted through the pressure spring.
7. The quick circuit breaker according to claim 1, characterized in that: still including falling the release mechanism, including fixing the base lever on the shell, rotate with the base lever and be connected the rocker, the rocker tip is provided with the couple, is provided with the oval hole on the rocker, the oval hole of rocker and the round pin axle swing joint of setting at the moving contact tip, the couple of rocker tip can hang the lock plate that falls the mechanism, prevents to fall the mechanism and loosens.
8. The quick circuit breaker according to claim 1, characterized in that: and two insulating rings are arranged in the contact area of the thrust rod and the insulating shell.
9. A novel drop-out type quick breaker, comprising a base, a drop-out mechanism and a quick breaker, wherein the quick breaker is the quick breaker as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021066770.3U CN212032977U (en) | 2020-06-10 | 2020-06-10 | Quick circuit breaker and novel drop-out quick breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021066770.3U CN212032977U (en) | 2020-06-10 | 2020-06-10 | Quick circuit breaker and novel drop-out quick breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212032977U true CN212032977U (en) | 2020-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021066770.3U Active CN212032977U (en) | 2020-06-10 | 2020-06-10 | Quick circuit breaker and novel drop-out quick breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212032977U (en) |
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2020
- 2020-06-10 CN CN202021066770.3U patent/CN212032977U/en active Active
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Address after: 443000 No. 58, Shengli Third Road, Wujiagang District, Yichang City, Hubei Province Patentee after: China Shipbuilding Anzhi (Hubei) Technology Co.,Ltd. Address before: 100089 No.3, China Agricultural University International Business Park, No.10 Tianxiu Road, Haidian District, Beijing Patentee before: BEIJING ZHONGDIAN ANZHI TECHNOLOGY Co.,Ltd. |