CN114883159A - Drop-out power protection device - Google Patents
Drop-out power protection device Download PDFInfo
- Publication number
- CN114883159A CN114883159A CN202210531252.1A CN202210531252A CN114883159A CN 114883159 A CN114883159 A CN 114883159A CN 202210531252 A CN202210531252 A CN 202210531252A CN 114883159 A CN114883159 A CN 114883159A
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- China
- Prior art keywords
- liquid metal
- protection device
- drop
- out power
- current limiter
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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
- H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
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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
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuses (AREA)
Abstract
The invention provides a drop-out power protection device, belongs to the technical field of power, and solves the problem that the operation and maintenance cost is high because a fuse wire needs to be replaced on site in the existing drop-out power protection device. The drop-out power protection device comprises a supporting structure, an upper bracket and a lower bracket which are arranged at two ends of the supporting structure, and a liquid metal current limiter which is arranged in parallel with the supporting structure; the drop-out power protection device also comprises a circuit breaking mechanism fixedly connected with the upper bracket, one end of the liquid metal current limiter is rotatably connected with the lower bracket, and the other end of the liquid metal current limiter is movably connected with the circuit breaking mechanism.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a drop-out power protection device.
Background
The drop-out fuse is used as a protection device and widely applied to a high-voltage distribution system and a control system, and the working principle of the drop-out fuse is that when the current exceeds a specified value, the melt of the fuse is fused by the heat generated by the drop-out fuse, and a contact at one end of a fuse tube of the fuse is dropped and disconnected, so that a circuit is disconnected, and the purpose of circuit breaking protection is realized. However, the conventional drop-out fuse still needs to be replaced on site after the fuse is fused, so that the problem of high operation and maintenance cost is caused.
Disclosure of Invention
The invention aims to at least solve the technical problem that the operation and maintenance cost is high because the fuse wire of a drop-out fuse is still required to be replaced on site after being fused in the prior art, and provides a drop-out power protection device.
The embodiment of the invention provides a drop-out power protection device, which comprises a supporting structure, an upper bracket, a lower bracket and a liquid metal current limiter, wherein the upper bracket and the lower bracket are arranged at two ends of the supporting structure;
the drop-out power protection device further comprises a circuit breaking mechanism fixedly connected with the upper support, one end of the liquid metal current limiter is rotatably connected with the lower support, and the other end of the liquid metal current limiter is movably connected with the circuit breaking mechanism.
Optionally, the liquid metal current limiter comprises a limiting end cap, an insulating housing and a fixed electrode; the limiting end covers and the fixed electrodes are symmetrically arranged at two ends of the insulating shell and form a closed cavity with the insulating shell; an insulating partition plate is vertically arranged in the closed cavity, and a through-flow hole is formed in the middle of the insulating partition plate;
the liquid metal current limiter further comprises a movable electrode, wherein the movable electrode comprises a main body part and a connecting part, the main body part is located between the limiting end cover and the insulating partition plate, and the connecting part is located outside the closed cavity; liquid metal is filled between the insulating partition plate and the main body part, and the insulating partition plate and the fixed electrode are arranged between the insulating partition plate and the fixed electrode;
the connecting part is movably connected with the circuit breaking mechanism, and the fixed electrode is rotatably connected with the lower bracket.
Optionally, the liquid metal flow restrictor further comprises a reset mechanism disposed between the limiting end cap and the main body portion of the movable electrode.
Optionally, the return structure comprises a return spring.
Optionally, the drop-out power protection device further includes a control mechanism, and the control mechanism includes a driving part fixedly connected to the support structure, a transmission rod fixedly connected to the driving part, and a transmission frame movably connected to the transmission rod; the transmission frame is also fixedly connected with the liquid metal current limiter and movably connected with the lower support.
Optionally, the control mechanism is an electromagnetic push-pull rod box, and the electromagnetic push-pull rod box comprises a box body, a permanent magnet arranged in the box body, an electromagnetic coil wound outside the permanent magnet, and a push-pull rod arranged between the permanent magnet and the electromagnetic coil; wherein, the push-pull rod is fixedly connected with the transmission rod.
Optionally, the electromagnetic push-pull rod box further comprises a limit switch, and the limit switch is in transmission connection with the circuit breaking mechanism.
Optionally, the liquid metal current limiter further comprises an insulating contact, and the insulating contact is fixedly connected with the connecting portion of the movable electrode.
Optionally, the insulating housing is of cylindrical configuration.
Optionally, the circuit breaking mechanism comprises a mechanical switch.
Drawings
Fig. 1 is a schematic structural diagram of a drop-out power protection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a liquid metal current limiter according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the liquid metal flow restrictor of FIG. 2;
FIG. 4 is a schematic diagram of the rapid contraction arcing of liquid metal in the liquid metal flow restrictor of FIG. 2;
fig. 5 is a schematic structural diagram of an electromagnetic push-pull rod box according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The fuse wire of the existing drop-out fuse belongs to a disposable product, the joule heat generated by overlarge current leads to the fusing of the fuse wire, the fuse wire is broken, at the moment, the fuse wire can only be replaced, and the integral operation and maintenance cost is overhigh. Although the existing intelligent drop-out fuse can realize the switching-on and switching-off of the fuse under remote control, the fuse wire still needs to be replaced on site after the fuse wire is fused, and the operation and maintenance cost cannot be obviously reduced in the actual operation and maintenance.
In order to solve at least one of the above technical problems, an embodiment of the invention provides a drop-out power protection device, and the drop-out power protection device provided by the embodiment of the invention is further described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a drop-out power protection apparatus according to an embodiment of the present invention, and as shown in fig. 1, the drop-out power protection apparatus includes a support structure 1, an upper bracket 11, a lower bracket 12, a liquid metal current limiter 2, and a circuit breaking mechanism 13.
Specifically, an upper bracket 11 and a lower bracket 12 are respectively provided at upper and lower ends of the support structure 1. The breaking mechanism 13 is fixedly connected with the upper bracket 11. The liquid metal current limiter 2 is arranged side by side with the support structure 1, one end of the liquid metal current limiter 2 is rotatably connected with the lower bracket 12, and the other end is movably connected with the circuit breaking mechanism 13.
Wherein, one end of the liquid metal current limiter 2 is rotatably connected with the lower bracket 12, which means that the liquid metal current limiter 2 is rotatably connected with the lower bracket 12, that is, after the liquid metal current limiter 2 is connected with the lower bracket 12, the liquid metal current limiter 2 can rotate relative to the lower bracket 12. The other end of the liquid metal current limiter 2 is movably connected with the circuit breaking mechanism 13, which means that the liquid metal current limiter 2 is lapped with the circuit breaking mechanism 13 under the condition that the current flowing through the liquid metal current limiter 2 is normal; when the current flowing through the liquid metal current limiter 2 is excessive, the liquid metal current limiter 2 is disconnected from the breaking mechanism 13. Alternatively, the movable connection may be a snap connection or an interlocking connection, which is not limited herein.
Optionally, the supporting structure 1 may be an insulator, the insulator includes a glass fiber resin core rod, an organic material sheath, and an umbrella skirt, the glass fiber resin core rod is wrapped by the organic material sheath, and the umbrella skirt is disposed on the organic material sheath. Optionally, the insulator is made of a glass fiber resin core rod or core tube, a sheath made of an organic material and a shed, the core rod is a bearing part of the mechanical load of the composite insulator and is also a main part of the internal insulation, the shed sheath is an external insulation part of the composite insulator and is used for protecting the core rod from the invasion of the external atmosphere, and the composite insulator is small in size, light in weight, high in tensile strength and capable of avoiding damage caused by explosion.
The drop-out power protection device is connected in series into a circuit through interfaces (not shown in the figure) on the upper bracket 11 and the lower bracket 12, and when the current flowing through the liquid metal current limiter 2 in the circuit is in a normal range, the upper end of the liquid metal current limiter 2 is locked with the circuit breaking mechanism 13. When the current flowing through the liquid metal current limiter 2 in the circuit is abnormally increased due to short circuit and the like, the upper end of the liquid metal current limiter 2 is disconnected with the circuit breaking mechanism 13, and then the liquid metal current limiter 2 falls off from the side, away from the supporting structure 1, of the bracket 12 below the liquid metal current limiter in the axial direction, so that the circuit is broken, and overcurrent and overload protection of the circuit is realized.
In this embodiment, one end of the liquid metal current limiter 2 is rotatably connected to the lower bracket 12, and the other end of the liquid metal current limiter is movably connected to the circuit breaking mechanism 13, so that when the current flowing through the liquid metal current limiter 2 in the circuit is abnormally increased due to short circuit or the like, the upper end of the liquid metal current limiter 2 is disconnected from the circuit breaking mechanism 13, and then the liquid metal current limiter 2 falls off from the lower bracket to the side axially far away from the supporting structure 1, so as to disconnect the circuit and realize overcurrent and overload protection of the circuit.
In some embodiments, fig. 2 is a schematic structural diagram of a liquid metal current limiter according to an embodiment of the present invention, fig. 3 is a cross-sectional view of the liquid metal current limiter shown in fig. 2, and fig. 4 is a schematic diagram of fast contraction and arc initiation of liquid metal in the liquid metal current limiter shown in fig. 2. As shown in fig. 2-4, the liquid metal current limiter 2 includes a limit end cap 21, an insulating housing 22, a fixed electrode 23, and a movable electrode 26.
Specifically, the limiting end caps 21 and the fixed electrodes 23 are symmetrically arranged at two ends of the insulating shell 22, and form a closed cavity with the insulating shell 22. An insulating partition plate 24 is vertically arranged in the closed cavity, and a through-flow hole 25 is formed in the middle of the insulating partition plate 24. The movable electrode 26 includes a main body portion 261 positioned between the limit end cap 21 and the insulating spacer 24, and a connecting portion 262 positioned outside the sealed cavity, and spaces between the insulating spacer 24 and the main body portion 261 of the movable electrode, and between the insulating spacer 24 and the fixed electrode 23 are filled with liquid metal. As shown in fig. 1, the connecting portion 262 is movably connected to the disconnecting mechanism 13, and the fixed electrode 23 is rotatably connected to the lower holder 12. The material of the liquid metal may be selected according to circumstances, and is not particularly limited herein. Alternatively, the material of the liquid metal includes, but is not limited to, gallium indium tin metal alloy, and the like.
The limit end cap 21 is used for limiting the movable electrode 26, and the material thereof may be selected according to the situation, and is not particularly limited herein. Optionally, the material of the limit end cap 21 is an insulating material. The disconnecting mechanism 13 may be selected according to circumstances, and may be, for example, a mechanical switch or an electronic switch. Preferably, the breaking mechanism 13 in this embodiment is a mechanical interlock switch.
The principle of the drop-out power protection device of the present embodiment is as follows:
as shown in fig. 1-4, the drop-out power protection device is connected in series to the circuit through the interfaces (not shown) on the upper and lower supports, and the fixed electrode 23, the liquid metal, and the movable electrode 26 form a path, and when the current in the circuit is within the normal range, the three are normally conducted. When the current in the circuit is abnormally increased due to a short circuit or the like, the local magnetic field at the through hole 25 is increased, so that the liquid metal at the through hole 25 is subjected to the lorentz force F shown in fig. 4. When the current is increased to a certain degree, the liquid metal at the through hole 25 contracts under the action of the lorentz force F, the effective sectional area of the liquid metal in the through hole 25 is reduced, so that the integral resistance of the liquid metal is increased, a current limiting effect is generated, the liquid metal breaks and arcs at the through hole 25 along with the continuous increase of the current and the continuous contraction of the liquid metal, the current flows through the generated joule heat and the heat generated in the moment of arcing to gasify part of the liquid metal at the through hole 25, a certain pressure is generated, the pressure pushes the connecting part 262 of the movable electrode 26 to be disconnected with the circuit breaking mechanism 13, and then the support 12 below the liquid metal current limiter 2 falls off rapidly for one side which is far away from the support structure 1 in the axial direction, so that the circuit is disconnected, and the overcurrent and overload protection of the circuit is realized.
In this embodiment, because when the electric current increases to a certain extent, the liquid metal appears contracting under the effect of lorentz force in discharge orifice 25 department, the effective sectional area of liquid metal diminishes in the discharge orifice 25, lead to the increase of liquid metal bulk resistance, produce the current limiting effect, along with the continuous increase of electric current and the continuous shrink of liquid metal, the gasification of the partial liquid metal of discharge orifice 25 department produces pressure, the connecting portion 262 and the disconnection mechanism 13 disconnection of movable electrode 26, liquid metal current limiter 2 falls rapidly to the one side of keeping away from bearing structure 1 afterwards, thereby make the circuit break, realize thoroughly breaking out the current, and then realize the arc extinguishing, and this embodiment has adopted the mode of current limiting earlier fusing again, protection to the circuit is more timely.
In some embodiments, as shown in fig. 3, liquid metal restrictor 2 further comprises a reset mechanism 28, reset mechanism 28 being disposed between limiting end cap 21 and body portion 261 of the movable electrode. The restoring structure 28 may be an elastic sheet, a spring, etc. with a restoring function. Preferably, the return structure 28 is a return spring.
During the complete circuit break, the liquid metal flow restrictor 2 is extinguished, the gasified liquid metal is gradually condensed, and the internal pressure is gradually reduced, so that the movable electrode 26 is gradually restored to the initial state under the action of the return spring 28, and the movable electrode 26, the liquid metal and the fixed electrode 23 are conducted again. However, because the liquid metal current limiter 2 and the circuit breaker 1 are completely disconnected, no current passes through the liquid metal current limiter 2 until the fault is eliminated, and the circuit can work normally after the liquid metal current limiter 2 is controlled to be reconnected with the circuit breaker 1.
In the embodiment, since the reset mechanism 28 is further disposed inside the liquid metal current limiter 2, after the line fault is cleared, the liquid metal current limiter 2 can be normally reset and conducted without manual reset, thereby saving labor resources and reducing operation and maintenance costs.
In some embodiments, as shown in fig. 1, the drop-out power protection device further includes a control mechanism including a drive portion 31, a drive rod 32, and a drive frame 33.
Wherein the drive part 31 is fixedly connected with the support structure 1. One end of the transmission rod 32 is fixedly connected with the driving part 31, and the other end is movably connected with the transmission frame 33. The transmission frame 33 is movably connected with the transmission rod 32, and the transmission frame 33 is also fixedly connected with the liquid metal current limiter 2 and movably connected with the lower bracket 12.
During the circuit resetting, the control mechanism can remotely receive a control signal, and the transmission rod 32 is controlled to drag the transmission frame 33 according to the received control signal, so that the liquid metal current limiter 2 moves to one side close to the supporting structure 1, the reconnection of the liquid metal current limiter 2 and the circuit breaking mechanism 13 is realized, and the resetting is realized.
In this embodiment, the control mechanism remotely receives the control signal, and controls the transmission rod 32 to drag the transmission frame 33 according to the received control signal, so as to reset the liquid metal current limiter 2 and the circuit breaking mechanism 13, thereby realizing remote control and unattended operation, and greatly reducing the operation and maintenance cost.
The type of the control mechanism may be selected according to circumstances and is not particularly limited. In some embodiments, as shown in fig. 5, the control mechanism is an electromagnetic push-pull rod box, which includes a box body (not shown), a permanent magnet 51 disposed in the box body, an electromagnetic coil 52 wound outside the permanent magnet 51, and a push-pull rod 53 disposed between the permanent magnet 54 and the electromagnetic coil 52, wherein the push-pull rod 53 is fixedly connected to the transmission rod 32.
During the circuit reset, the electromagnetic push-pull rod box receives the control signal, and the present embodiment is described by taking the control signal as an example of current. The electromagnetic push-pull rod box transmits the received current to the electric field coil 52, and the push-pull rod 53 is controlled to move due to the change of the magnetic field in the box body, so that the push-pull rod 53 drives the transmission rod 32 to drag the transmission frame 33, the liquid metal current limiter 2 moves towards one side close to the supporting structure 1, the liquid metal current limiter 2 is reconnected with the circuit breaking mechanism 13, and resetting is achieved.
In the embodiment, the electromagnetic push-pull rod box is used as the control mechanism, so that the automatic resetting of the liquid metal current limiter 2 and the circuit breaking mechanism 13 can be realized, the remote control and the unattended operation are realized, and the operation and maintenance cost is reduced.
In an alternative embodiment, as shown in fig. 5, the electromagnetic push-pull rod box further comprises a limit switch 54, and the limit switch 54 is in transmission connection with the circuit breaking mechanism 13. For example, when the current in the circuit is abnormally increased due to a short circuit or the like, and the connection portion 262 of the movable electrode 26 is just disconnected from the disconnecting mechanism 13, the disconnecting mechanism transmits a signal to the limit switch 13 of the electromagnetic push-pull rod box through the transmission structure, so that the electromagnetic push-pull rod box drives the push-pull rod 53 to move according to the action of the limit switch 54, the push-pull rod 53 drives the transmission rod 32 to push the transmission frame 33, and the liquid metal current limiter 2 can fall more quickly, and the response speed of the fall-down power protection device is increased.
In some embodiments, as shown in fig. 2 and 3, to prevent electrical leakage from connecting portion 262 of movable electrode 26, liquid metal current limiter 2 further includes an insulated contact 27, and insulated contact 27 is fixedly connected to connecting portion 262 of movable electrode 26.
In some embodiments, as shown in fig. 2-3, the movable electrode 26 is made of a conductive material and is configured as a cylindrical piston structure that forms a seal with the inside of the insulating housing 22, but is axially movable relative to the insulating housing 22 for conducting and pushing the insulating contact 27 to move. The connecting portion 262 of the movable electrode 26 is provided with a through hole for connecting with an external conductive terminal. The fixed electrode 23 is also made of a material with good electric conduction and is tightly connected with the end part of the insulating shell 22 to form a good sealing effect, and the fixed electrode 23 is also provided with a through hole and can be externally connected with a conductive terminal. The shape of the insulating housing 22 may be selected according to circumstances and is not particularly limited, and it is preferable that the insulating housing 22 has a cylindrical shape. The spacing end cover 21 and the insulating shell 22, and the fixed electrode 23 and the insulating shell 22 are connected by fastening bolts.
In this embodiment, the liquid metal flow-limiting mechanism 2 is in the form of a cylindrical cylinder, so that the liquid metal flow-limiting mechanism has the advantages of good sealing performance, high reliability, small volume and capability of being installed and placed in any direction.
In some embodiments, as shown in FIG. 2, the through-flow holes 25 are circular, elliptical, triangular, rectangular, or square in shape.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A drop-out power protection device is characterized by comprising a supporting structure, an upper bracket, a lower bracket and a liquid metal current limiter, wherein the upper bracket and the lower bracket are arranged at two ends of the supporting structure;
the drop-out power protection device further comprises a circuit breaking mechanism fixedly connected with the upper support, one end of the liquid metal current limiter is rotatably connected with the lower support, and the other end of the liquid metal current limiter is movably connected with the circuit breaking mechanism.
2. A drop out power protection device as claimed in claim 1, wherein the liquid metal current limiter comprises a limiting end cap, an insulating housing and a fixed electrode; the limiting end covers and the fixed electrodes are symmetrically arranged at two ends of the insulating shell and form a closed cavity with the insulating shell; an insulating partition plate is vertically arranged in the closed cavity, and a through-flow hole is formed in the middle of the insulating partition plate;
the liquid metal current limiter further comprises a movable electrode, wherein the movable electrode comprises a main body part and a connecting part, the main body part is located between the limiting end cover and the insulating partition plate, and the connecting part is located outside the closed cavity; liquid metal is filled between the insulating partition plate and the main body part, and liquid metal is filled between the insulating partition plate and the fixed electrode;
the connecting part is movably connected with the circuit breaking mechanism, and the fixed electrode is rotatably connected with the lower bracket.
3. The drop-out power protection device according to claim 2, wherein the liquid metal current limiter further comprises a reset mechanism disposed between the limiting end cap and the main body portion of the movable electrode.
4. A drop out power protection device as claimed in claim 3, wherein the return structure comprises a return spring.
5. The drop-out power protection device according to claim 1, further comprising a control mechanism, wherein the control mechanism comprises a driving part fixedly connected with the support structure, a transmission rod fixedly connected with the driving part, and a transmission frame movably connected with the transmission rod; the transmission frame is also fixedly connected with the liquid metal current limiter and movably connected with the lower support.
6. The drop-out power protection device according to claim 5, wherein the control mechanism is an electromagnetic push-pull rod box, and the electromagnetic push-pull rod box comprises a box body, a permanent magnet arranged in the box body, an electromagnetic coil wound outside the permanent magnet, and a push-pull rod arranged between the permanent magnet and the electromagnetic coil; wherein, the push-pull rod is fixedly connected with the transmission rod.
7. The drop-out power protection device of claim 6, wherein the electromagnetic push-pull rod box further comprises a limit switch, and the limit switch is in transmission connection with the circuit breaking mechanism.
8. A drop out power protection device according to any of claims 1 to 7, wherein the liquid metal current limiter further comprises an insulated contact fixedly connected to the connecting portion of the movable electrode.
9. A drop out power protection device according to any of claims 1 to 7, wherein the insulating housing is of cylindrical configuration.
10. A drop out power protection device according to any of claims 1-7, wherein the disconnect mechanism comprises a mechanical switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531252.1A CN114883159A (en) | 2022-05-16 | 2022-05-16 | Drop-out power protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531252.1A CN114883159A (en) | 2022-05-16 | 2022-05-16 | Drop-out power protection device |
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| Publication Number | Publication Date |
|---|---|
| CN114883159A true CN114883159A (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210531252.1A Pending CN114883159A (en) | 2022-05-16 | 2022-05-16 | Drop-out power protection device |
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| CN (1) | CN114883159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116417303A (en) * | 2023-03-21 | 2023-07-11 | 国网山东省电力公司成武县供电公司 | High-voltage intelligent drop-out fuse device and safe gate opening and closing method |
-
2022
- 2022-05-16 CN CN202210531252.1A patent/CN114883159A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116417303A (en) * | 2023-03-21 | 2023-07-11 | 国网山东省电力公司成武县供电公司 | High-voltage intelligent drop-out fuse device and safe gate opening and closing method |
| CN116417303B (en) * | 2023-03-21 | 2023-09-01 | 国网山东省电力公司成武县供电公司 | High-voltage intelligent drop-out fuse device and safe gate opening and closing method |
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