WO2024045422A1

WO2024045422A1 - Multi-excitation-source protection apparatus

Info

Publication number: WO2024045422A1
Application number: PCT/CN2022/139785
Authority: WO
Inventors: 石晓光; 王立强; 陈宁; 胡楠; 杜保红
Original assignee: 西安中熔电气股份有限公司
Priority date: 2022-09-01
Filing date: 2022-12-16
Publication date: 2024-03-07
Also published as: CN117672729A

Abstract

The present disclosure relates to the fields of electric power control and electric vehicles. Disclosed is a multi-excitation-source protection apparatus, comprising a first conductor, a first fuse and a second conductor, which are sequentially connected in series, and further comprising a first excitation source, a second excitation source and at least one self-excitation trigger circuit, wherein the first excitation source and the second excitation source are integrated together; the self-excitation trigger circuit is connected to the first fuse in parallel, and the self-excitation trigger circuit is respectively electrically connected to the first excitation source and the second excitation source, to send a trigger signal thereto; and the first excitation source and the second excitation source act according to the trigger signal to drive a disconnection apparatus to disconnect the first conductor or the second conductor. In the present disclosure, multiple excitation sources are combined with multiple trigger-signal sending modes, such that the operational reliability of a protection apparatus is improved.

Description

A multi-excitation source protection device

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 202211065067.4 and titled "A Multi-Excitation Source Protection Device" submitted to the State Intellectual Property Office of China on September 1, 2022, the entire content of which is incorporated into this disclosure by reference. middle.

Technical field

The present disclosure relates to the fields of power control and electric vehicles, and in particular to a protection device for circuit protection.

Background technique

In the related art, most of the circuit protection devices that mechanically trigger the protection action use an external trigger signal to trigger the action of the excitation source, thereby mechanically disconnecting the circuit. This type of circuit protection device mainly consists of an excitation source, a cutting device and a conductor through which current flows during operation. The excitation source receives an external trigger signal, ignites and releases high-pressure gas, and drives the cutting device to cut off the conductor and open the circuit. For example, Chinese patent CN202122592829 discloses an excitation protection device with multiple excitation sources. The multiple excitation sources are all triggered by external trigger signals.

However, this protection device has certain disadvantages. When the external trigger signal circuit or its own trigger circuit fails, or the excitation source fails, serious safety accidents may result because the current cannot be cut off in time.

Contents of the invention

The purpose of this disclosure is to provide a multi-excitation source protection device that uses more than two excitation sources and at least two sets of circuits that send trigger signals to ensure that even if one of the trigger circuits fails or one of the excitation sources fails, timely Disconnect the circuit. The multi-excitation source protection device of the present disclosure maximizes the working reliability of the protection device through the combination of multiple excitation sources and multiple sets of trigger circuits.

In order to achieve the above object, an embodiment of the present disclosure provides a multi-excitation source protection device, which includes a first conductor, a first melt and a second conductor connected in series, and also includes a first excitation source, a second excitation source, at least A self-excitation trigger circuit; the first excitation source and the second excitation source are integrated together; the self-excitation trigger circuit is connected in parallel with the first melt, and the self-excitation trigger circuit is respectively connected with the first excitation source It is electrically connected to the second excitation source to send a trigger signal; the first excitation source and the second excitation source act according to the trigger signal, driving the cutting device to disconnect the first conductor or the second conductor.

Optionally, the first excitation source and the second excitation source share the cutting device. When the first excitation source and the second excitation source act according to receiving a trigger signal, the cutting device is driven synchronously to act. Cut the first conductor or the second conductor.

Optionally, the cutting device includes a first cutting device and a second cutting device, the first cutting device corresponds to the first excitation source, and the second cutting device corresponds to the second excitation source. When When the first excitation source and the second excitation source act upon receiving a trigger signal, they respectively drive the corresponding cutting devices to act to cut off the first conductor or the second conductor.

Optionally, the first cutting device and the second cutting device are driven synchronously or sequentially to cut the first conductor with corresponding synchronous actions or cut the first conductor or the second conductor with sequential actions.

Optionally, the first cutting device and the second cutting device cut off the first conductor or the second conductor at different positions in the circuit of the multi-excitation source protection device.

Optionally, the multi-excitation source protection device further includes a third excitation source; the third excitation source is connected to an external trigger circuit, and the third excitation source acts according to the trigger signal of the external trigger circuit to drive another cutting device to disconnect the third excitation source. a conductor or a second conductor.

Optionally, a second melt is connected in parallel to the first conductor or the second conductor, and all fractures formed in the first conductor or the second conductor are located between the second melt and the first conductor or the second conductor. Between the two ends of the conductor connection; the second melt can self-fuse after the first conductor or the second conductor is cut off, or can be cut off by a cutting device driven by the first excitation source and the second excitation source. open, or an additional disconnecting device capable of being driven by a third source of excitation opens.

Optionally, the at least one self-excited trigger circuit includes a first self-excited trigger circuit and a second self-excited trigger circuit that are respectively connected in parallel with the first melt, and the first self-excited trigger circuit is connected to the first self-excited trigger circuit. The excitation source is conductively connected; the second self-excitation trigger circuit is conductively connected to the second excitation source; when the first melt operates normally, the first self-excitation trigger circuit is not connected; when the first melt When fusing, the second self-excited trigger circuit directly sends a trigger signal to the second excitation source; the first self-excited trigger circuit is driven by the arc energy or elastic force generated by the first melt melt to interact with the The first excitation source is electrically connected to send a trigger signal thereto.

Optionally, the multi-excitation source protection device further includes a transmission device. When the first melt melts, the transmission device operates driven by the arc energy or elastic force generated by the melt melting of the first melt. The transmission device drives the first self-excited trigger circuit to connect.

Optionally, the first self-excited trigger circuit includes two connecting wires connected in parallel at both ends of the first melt, the two connecting wires are conductively connected to the first conductor and the second conductor respectively, and the The first self-excitation trigger circuit also includes a circuit part conductively connected to the signal receiving end of the first excitation source, and the other end of the circuit part away from the first excitation source is conductively connected to two conductive connectors, The two conductive connectors are respectively located between the free ends of the two connecting wires and the first melt; the transmission device is provided between the first melt and the conductive connector, when When the first melt melts, driven by the arc energy or elastic force generated by the first melt melt, the transmission device operates to drive the two conductive connectors to conduct electricity with the two connecting wires respectively. connection, causing the first self-excitation trigger circuit to conduct to send a trigger signal to the first excitation source.

Optionally, the first melt binding spring is in a compressed state. When the first melt is melted, the elastic force generated by the spring drives the transmission device to move.

Optionally, the transmission device closes the space where the first melt is located, and the arc energy generated by the fusing of the first melt drives the displacement of the transmission device.

Optionally, a transformer is connected in series in the self-excited trigger circuit.

Optionally, the high-voltage end of the transformer is connected in parallel with the first melt, and the low-voltage end of the transformer is connected with the excitation source end, so that the high voltage at the first melt is isolated from the low voltage at the excitation source end.

Optionally, both the first excitation source and the second excitation source are gas generating devices. The gas generating devices heat and ignite according to the received trigger signal to release high-pressure gas, thereby generating gas for driving the cutting device. the driving force.

The multi-excitation source protection device provided by the embodiment of the present disclosure uses a first melt fuse disconnection circuit and three excitation sources for circuit disconnection to achieve quadruple circuit protection. Among the three excitation sources, two are triggered by the self-excitation trigger signal and the other is triggered by the external trigger signal to ensure that the self-excitation trigger signal can be triggered when the external trigger signal fails. In self-excited triggering, two triggering methods are also used, one of which directly collects the voltage signal of the first melt melt as the trigger signal, and the other uses the arc energy of the first melt melt to drive the connection between the trigger circuit and the excitation source. conduction, and then collect the melting voltage of the first melt as the trigger signal. At the same time, a second melt is connected in parallel to the first conductor or the second conductor, and the arc extinguishing ability of the protection device is improved through the second melt.

The multi-excitation source protection device provided by the embodiment of the present disclosure realizes multiple protection modes through the arrangement and combination of three excitation sources and the trigger circuit trigger mode, improves the working reliability of the protection device, and ensures that when a fault current occurs, it can interrupt Open circuit.

Description of drawings

Figure 1 is a schematic circuit diagram of a multi-excitation source protection device provided by an exemplary embodiment of the present disclosure.

FIG. 2 is a schematic circuit diagram of another multi-excitation source protection device provided by an exemplary embodiment of the present disclosure.

FIG. 3 is a schematic circuit diagram of yet another multi-excitation source protection device provided by an exemplary embodiment of the present disclosure.

FIG. 4 shows a schematic structural diagram of the first self-excited trigger circuit and the first melt in the multi-excitation source protection device illustrated in FIG. 3 .

Figure 5 is a schematic cross-sectional structural view of Figure 4.

Reference signs: first conductor 10, first melt 20, second conductor 30, first excitation source 40, second excitation source 50, third excitation source 60, self-excitation trigger circuit 400, first self-excitation trigger circuit 410. The second self-excited trigger circuit 420, the external trigger circuit 600, the second melt 110, the connecting wire 4101, the connecting wire 4102, the conductive connector 4103, the conductive connector 4104, and the transmission device 4105.

Detailed ways

The present disclosure will be described in detail below with the aid of exemplary embodiments with reference to the accompanying drawings. It should be noted that the following detailed description of the present disclosure is for illustrative purposes only and is in no way limiting of the present disclosure. Furthermore, the same reference numerals are used in the various drawings to designate the same components.

It should also be noted that, for the sake of clarity, not all features of actual specific embodiments are described and illustrated in the specification and drawings, and to avoid obscuring the technical solutions focused on this disclosure with unnecessary detail, in the appended The figures and description only describe and illustrate device structures closely related to the technical solution of the present disclosure, while omitting other details that are not closely related to the technical content of the present disclosure and are known to those skilled in the art.

In addition, the structural position words such as top, bottom, left, right, front, back, top, and bottom mentioned in the description do not limit the structural position and are only for convenience of understanding.

Please refer to FIG. 1 , which shows a schematic circuit diagram of a multi-excitation source protection device provided by an exemplary embodiment of the present disclosure. As shown in the figure, the multi-excitation source protection device according to the embodiment of the present disclosure may include a first conductor 10, a first melt 20, and a second conductor 30 connected in series. During operation, current will flow through the first conductor 10, the first melt 20 and the second conductor 30. The first fuse 20 is required to be fusible under small fault current conditions, so that the fusing current can flow through the circuit of the first conductor, the first fuse and the second conductor. The multi-excitation source protection device according to the embodiment of the present disclosure may further include a first excitation source 40, a second excitation source 50 and a self-excitation trigger circuit 400. In some optional embodiments, the first excitation source 40 and/or the second excitation source 50 may be a gas generating device, which heats and ignites according to the received trigger signal, and then releases high-pressure gas to generate driving force.

The first excitation source 40 and the second excitation source 50 may be integrated together. In this embodiment, the first excitation source 40 and the second excitation source 50 share a cutting device (not shown). A self-excitation trigger circuit 400 is connected in parallel to the first melt 20 , and the self-excitation trigger circuit 400 is conductively connected to the first excitation source 40 and the second excitation source 50 respectively. A second melt 110 is connected in parallel to the first conductor 10 . Under normal operating conditions, current flows through the first conductor 10, the first melt 20 and the second conductor 30. Under normal operating conditions, the first melt 20 is a conductor that allows current to flow, and its resistance value is very small. Therefore, the voltage of the first melt 20 is very small and cannot heat the excitation source to cause ignition. Only when the first melt 20 melts and the voltage suddenly increases, the excitation source can be prompted to heat and ignite.

When the first melt 20 melts, the self-excitation trigger circuit 400 collects the voltage signal at the fracture after the first melt 20 melts, and sends it as a trigger signal to the first excitation source 40 and the second excitation source 50 respectively. The source 40 and the second excitation source 50 act according to the received trigger signal, synchronously drive the cutting device to act, cut off the first conductor 10, and disconnect the circuit.

The above-mentioned first excitation source 40, second excitation source 50, and cut-off device are integrated together, and the two excitation sources back up each other to form multiple protections.

The working principle of the multi-excitation source protection device according to the embodiment of the present disclosure:

When a fault current occurs, the first melt 20 melts, and the voltage at the first melt 20 rises instantaneously. The self-excitation trigger circuit 400 obtains the voltage signal at the melt point of the first melt 20 and sends it to the first excitation The signal receiving ends of the source 40 and the second excitation source 50 are heated and ignited, releasing high-pressure gas, driving the first excitation source 40 and the second excitation source 50 to act simultaneously, and driving the cutting device to act to disconnect the first conductor 10. When the first conductor After 10 is disconnected, most of the current flows through the second melt 110, and the second melt 110 fuses to completely disconnect the circuit.

Since the self-excitation signal generated inside the protection device is sent to the first excitation source 40 and the second excitation source 50 , when one of the excitation sources fails, the other excitation source can be ensured to act to disconnect the first conductor 10 . When the first conductor 10 is disconnected, most of the current flows through the second melt 110. Since the resistance value of the second melt 110 is much greater than the resistance value of the first conductor 10, when the current flows through the second melt, the current It is reduced exponentially to avoid damage to the circuit. At the same time, when the second melt melts, due to the small current, the arc formed after disconnection is very small and it is easy to extinguish the arc.

On the basis of the above, when the first excitation source 40 and the second excitation source 50 operate, the cutting device can be driven to disconnect the first conductor 10 and then the second melt 110 to ensure that the circuit is disconnected.

In this embodiment, the first excitation source 40 and the second excitation source 50 can respectively drive a cutting device to disconnect the first conductor 10. When driving a cutting device respectively, the actions of the two cutting devices must not interfere with each other, and the two cutting devices must not interfere with each other. The distances between the cutting devices and the first conductor 10 may be different. In this way, when the first excitation source 40 and the second excitation source 50 act, their corresponding cutting devices may act synchronously to cut off the first conductor 10 or act sequentially to cut off the first conductors. 10.

Next, please refer to FIG. 2 , which shows a schematic circuit diagram of another multi-excitation source protection device provided by an exemplary embodiment of the present disclosure. On the basis of the multi-excitation source protection device shown in FIG. 1 , the device shown in FIG. 2 adds a third excitation source 60 and an external trigger circuit 600 . Under the external control system, the external trigger circuit 600 sends a trigger signal to the third excitation source 60 . The second melt 110 is connected in parallel on both sides of the fracture of the first conductor 10 where the first excitation source 40 , the second excitation source 50 and the third excitation source 60 are disconnected. The third excitation source 60 operates according to the trigger signal sent by the external trigger circuit 600 to drive the third cutting device to sequentially disconnect the first conductor 10 and the second melt 110 .

Under normal operating conditions, current flows through the first conductor 10, the first melt 20, and the second conductor 30.

When a fault current occurs, first, the external trigger circuit 600 sends a trigger signal to the third excitation source 60. The third excitation source 60 ignites and releases high-pressure gas to drive the third cutting device to cut off the first conductor 10. When the first conductor 10 After cutting off, the third cutting device continues to displace to cut off the second melt 110; after the third excitation source 60 operates to complete the circuit disconnection, if the first melt 20 is not melted, the first excitation source 40 and the second excitation source 50 no action;

If the first melt 20 fuses during the operation of the third excitation source 60 or before it operates. If the arc is quickly extinguished when the first melt 20 fuses, the first melt 20 can be fused for the first time. open circuit;

The first melt 20 melts, and regardless of whether an arc is formed at the melted fracture of the first melt 20, the self-excitation trigger circuit 400 obtains the voltage signal at the melted point of the first melt 20 and sends it to the first excitation source 40 and the second excitation source 50, respectively. The first excitation source 40 and the second excitation source 50 act, driving the cutting device to act and disconnect the first conductor 10; if the first melt 20 fuses and disconnects the circuit, the second fuse 110 does not fuse; if the first melt 20 Melting forms an arc at the fracture, and current flows through the second melt 110. Since the resistance of the second melt 110 is large, the second melt 110 rapidly heats up and fuses to break the circuit.

In the design of the protection device in this embodiment, it can also be designed to drive the cutting device to disconnect the first conductor 10 and then the second melt 110 after the first excitation source 40 and the second excitation source 50 act.

Please refer to FIG. 3 again. FIG. 3 shows a schematic circuit diagram of yet another multi-excitation source protection device provided by an exemplary embodiment of the present disclosure. Based on the multi-excitation source protection device shown in Figure 2, the device shown in Figure 3 connects the first excitation source 40 and the second excitation source 50 to respective self-excitation trigger circuits. A first self-excitation trigger circuit 410 and a second self-excitation trigger circuit 420 are respectively connected in parallel on the first melt 20. The first self-excitation trigger circuit 410 is conductively connected to the first excitation source 40, and the second self-excitation trigger circuit 420 is conductively connected to the first excitation source 40. The two excitation sources 50 are electrically connected. Under normal conditions, the first self-excited trigger circuit 410 is not connected; only when the first melt 20 melts and is driven by arc energy, the first self-excited trigger circuit 410 is connected. The second melt 110 is connected in parallel on both sides of the fracture of the first conductor 10 where the first excitation source 40 , the second excitation source 50 and the third excitation source 60 are disconnected.

The first excitation source 40 and the second excitation source 50 are offset and integrated in a housing. The first excitation source 40 drives the first cutting device to disconnect the first conductor 10 , and the second excitation source drives the second cutting device to disconnect the first conductor 10 , wherein the first cutting device and the second cutting device disconnect the first conductor 10 The location is different. When the first melt 20 melts, driven by arc energy, the first self-excited trigger circuit 410 is connected to the first excitation source 40 to send a trigger signal to the first excitation source; the second self-excited trigger circuit 420 is the second excitation source. 50 sends a trigger signal.

For a structure in which the first self-excited trigger circuit 410 is driven by arc energy and is electrically connected to the first excitation source 40 , FIG. 4 shows a possible conductive connection method. FIG. 5 is a cross-sectional view of the structure shown in FIG. 4 . The first self-excited trigger circuit 410 includes two connecting

wires

4101 and 4102 connected in parallel at both ends of the first melt 20. The connecting

wires

4101 and 4102 are conductively connected to the first conductor 10 and the second conductor 30 respectively. The first self-excited trigger circuit 410 also includes a circuit part that is conductively connected to the signal receiving end of the first excitation source 40. One end of the circuit part away from the first excitation source is conductively connected to two

conductive connectors

4103 and 4104 respectively. The

conductive connectors

4103 and 4104 are respectively located between the free ends of the connecting

wires

4101 and 4102 and the first melt 20 . A transmission device 4105 is provided between the first melt 20 and the conductive connector. The transmission device 4105 is a piston structure. The structural and positional relationship between the transmission device 4105 and the first melt 20 satisfies the melting of the first melt 20. The generated arc energy can drive the displacement of the transmission device 4105, and drive the

conductive connectors

4103, 4104 through the transmission device 4105 to be conductively connected to the

connection wires

4101, 4102, so that the first self-excitation trigger circuit 410 is turned on and sends a trigger signal to the first excitation source 40. .

The working principle of the multi-excitation source protection device provided by exemplary embodiments of the present disclosure:

When a fault current occurs, first, the external trigger circuit 600 sends a trigger signal to the third excitation source 60. The third excitation source 60 ignites and releases high-pressure gas to drive the third cutting device to cut off the first conductor 100. When the first conductor 100 After cutting off, the third cutting device continues to displace to cut off the second melt 110; after the third excitation source operates to complete the circuit disconnection, if the first melt 20 is not melted, the first excitation source 40 and the second excitation source 50 are not action;

If the first melt 20 fuses during or before the third excitation source 60 operates, and if the arc is quickly extinguished when the first melt 20 fuses, the first melt 20 can be fused for the first time. open circuit;

When the first melt 20 melts, regardless of whether an arc is formed at the melted fracture of the first melt 20, the second self-excitation trigger circuit 420 obtains the voltage signal at the melted point of the first melt 20 and sends it to the second excitation source 50. 50 operates to drive the second cutting device to disconnect the first conductor 10;

If the first fuse 20 fuses and breaks the circuit, the second fuse 110 does not fuse and the first excitation source 40 does not operate;

If the first melt 20 melts and forms an arc at the fracture, then driven by the arc energy, the transmission device 4105 operates to drive the

conductive connectors

4103 and 4104 to be conductively connected to the connecting

wires

4101 and 4102 respectively, turning on the first self-excitation trigger circuit 410 , the voltage signal at the melting point of the first melt 20 is obtained through the first self-excitation trigger circuit 410, and is sent to the first excitation source 40 as a trigger signal. The first excitation source 40 acts to drive the first cutting device to disconnect the first a conductor 10;

When the first conductor 10 is disconnected and the first melt 110 does not melt or melts and maintains an arc, current flows through the second melt 110 and the second melt 110 heats up and fuses to break the circuit.

In this embodiment, the second melt 110 can be disconnected by the third cutting device or fused by itself.

In this embodiment, since the first self-excitation trigger circuit 410 and the second self-excitation trigger circuit 420 obtain the voltage signal when the first melt 20 melts in sequence, the second excitation source acts first relative to the first excitation source. It is possible to realize the sequential actions of the first cutting device and the second cutting device.

At the same time, due to the addition of the second melt 110, when the current flows through the second melt 110, since the resistance of the second melt 110 is much greater than the resistance of the first conductor 10, when the current passes through the second melt 110, the current instantly decreases. , when the second melt 110 is disconnected, the arc generated is very small and it is easy to extinguish the arc.

In the multi-excitation source protection device provided by the embodiment of the present disclosure, the self-excited trigger circuit, including the first self-excited trigger circuit and the second self-excited trigger circuit, can adopt a transformer in the circuit, wherein the high-voltage end of the transformer is connected to the first self-excited trigger circuit. The melts are connected in parallel, and the low-voltage end is connected to the excitation source end to isolate the high voltage at the first melt and the low voltage at the excitation source end to improve reliability.

In the above embodiments, the excitation source and the cutting device are both disposed at the first conductor for cutting off the first conductor. They can also be disposed on the second conductor as needed, or the first excitation source and the second excitation source are integrated with the first conductor. The third excitation sources are respectively arranged on different conductors.

Industrial applicability

The embodiment of the present disclosure provides a multi-excitation source protection device, which includes a first conductor, a first melt and a second conductor connected in series, and also includes a first excitation source, a second excitation source, and at least one self-excitation trigger. Circuit; the first excitation source and the second excitation source are integrated together; the self-excitation trigger circuit is connected in parallel with the first melt, and the self-excitation trigger circuit is conductively connected to the first excitation source and the second excitation source respectively to send trigger signals thereto; An excitation source and a second excitation source act according to the trigger signal to drive the cutting device to disconnect the first conductor or the second conductor. The multi-excitation source protection device provided by the embodiment of the present disclosure improves the working reliability of the protection device through the combination of multiple excitation sources and multiple sets of trigger circuits.

Furthermore, it will be appreciated that the multiple excitation source protection devices of the present disclosure are reproducible and may be used in a variety of industrial applications. For example, the multi-excitation source protection device of the present disclosure can be used in the field of power control.

Claims

A multi-excitation source protection device, the multi-excitation source protection device includes a first conductor, a first melt and a second conductor connected in series, and also includes a first excitation source, a second excitation source, at least one self-excitation source Trigger circuit; the first excitation source and the second excitation source are integrated together; the self-excitation trigger circuit is connected in parallel with the first melt, and the self-excitation trigger circuit is connected with the first excitation source and the second excitation source respectively. The second excitation source is conductively connected to send a trigger signal; the first excitation source and the second excitation source act according to the trigger signal and drive the cutting device to disconnect the first conductor or the second conductor.
The multi-excitation source protection device according to claim 1, wherein the first excitation source and the second excitation source share the cutting device. When the first excitation source and the second excitation source receive When the trigger signal is activated, the cutting device is driven synchronously to cut off the first conductor or the second conductor.
The multi-excitation source protection device according to claim 1, wherein the cut-off device includes a first cut-off device and a second cut-off device, the first cut-off device corresponds to the first excitation source, and the second cut-off device The device corresponds to the second excitation source. When the first excitation source and the second excitation source act according to the received trigger signal, the corresponding first cutting device and the second cutting device are driven to act to cut off all the first conductor or the second conductor.
The multi-excitation source protection device according to claim 3, wherein the first cutting device and the second cutting device are driven synchronously or sequentially to cut off the first conductor or the first conductor with corresponding synchronous actions. the second conductor, or act successively to cut off the first conductor or the second conductor.
The multiple excitation source protection device according to claim 3 or 4, wherein the first cutting device and the second cutting device cut off the first conductor at different positions of the circuit of the multiple excitation source protection device. , or cut off the second conductor.
The multi-excitation source protection device according to any one of claims 1-5, wherein the multi-excitation source protection device further includes a third excitation source; the third excitation source is connected to an external trigger circuit, and the third excitation source The three excitation sources act according to the trigger signal of the external trigger circuit and drive another cutting device to act to disconnect the first conductor or the second conductor.
The multi-excitation source protection device according to any one of claims 1 to 6, wherein a second melt is connected in parallel to the first conductor or the second conductor, and the second melt is connected to the first conductor or the second conductor. All fractures formed are located between the two ends where the second melt is connected to the first conductor or the second conductor; the second melt can be formed when the first conductor or the second conductor is connected. It fuses itself after being cut off, or can be cut off by a cutoff device driven by the first excitation source and the second excitation source, or can be cut off by another cutoff device driven by a third excitation source.
The multi-excitation source protection device according to any one of claims 1 to 7, wherein the at least one self-excited trigger circuit includes a first self-excited trigger circuit and a second self-excited trigger circuit respectively connected in parallel with the first melt. Trigger circuit, the first self-excited trigger circuit is electrically connected to the first excitation source; the second self-excited trigger circuit is electrically connected to the second excitation source; when the first melt is operating normally, The first self-excited trigger circuit is not connected; when the first melt melts, the second self-excited trigger circuit directly sends a trigger signal to the second excitation source, and the first self-excited trigger circuit The arc energy or elastic force generated by the melt melting of the first melt is electrically connected to the first excitation source to send a trigger signal thereto.
The multi-excitation source protection device according to claim 8, wherein the multi-excitation source protection device further includes a transmission device, when the first melt melts, the arc energy generated by the first melt melt or Driven by elastic force, the transmission device moves, and the transmission device drives the first self-excited trigger circuit to connect.
The multi-excitation source protection device according to claim 9, wherein the first self-excited trigger circuit includes two connecting wires connected in parallel at both ends of the first melt, and the two connecting wires are connected to the first conductor respectively. electrically connected to the second conductor;

The first self-excitation trigger circuit also includes a circuit part conductively connected to the signal receiving end of the first excitation source, and one end of the circuit part away from the first excitation source is conductively connected to two conductive connectors. , the two conductive connectors are respectively located between the free ends of the two connecting wires and the first melt;

The transmission device is provided between the first melt and the conductive connector. When the first melt melts, driven by the arc energy or elastic force generated by the melt melting of the first melt, the The transmission device operates to drive the two conductive connecting members to be conductively connected to the two connecting wires respectively, so that the first self-excitation trigger circuit is turned on to send a trigger signal to the first excitation source.
The multi-excitation source protection device according to claim 9 or 10, characterized in that the first melt binding spring is in a compressed state, and when the first melt melts, the elastic force generated by the spring drives the transmission Device action.
The multi-excitation source protection device according to claim 9 or 10, characterized in that the transmission device closes the space where the first melt is located, and the arc energy generated by the fusing of the first melt drives the transmission device Displacement.
The multi-excitation source protection device according to any one of claims 1 to 12, characterized in that a transformer is connected in series in the self-excitation trigger circuit.
The multi-excitation source protection device according to claim 13, wherein the high-voltage end of the transformer is connected in parallel with the first melt, and the low-voltage end of the transformer is connected with the excitation source end, so that when the first melt The high voltage at the excitation source terminal is isolated from the low voltage at the excitation source terminal.
The multi-excitation source protection device according to any one of claims 1 to 14, wherein the first excitation source and the second excitation source are gas generating devices, and the gas generating device responds to a received trigger The signal is heated and ignited to release high-pressure gas, thereby generating a driving force for driving the cutting device.