A high-reliability active and passive integrated protection device

Abstract

The application relates to the field of electric power control and electric vehicles, and discloses a high-reliability active and passive integrated protection device which comprises a first conductor, a first fuse body, a second conductor and a first excitation device which are connected in series; the first fuse body is connected in parallel with a first trigger circuit; in a normal working state of the first fuse body, the first trigger circuit is not conductive with the first excitation device; when the first fuse body is fused, the first fuse body disconnects the circuit, or under the action of arc energy or elastic force, the first trigger circuit can be driven to be conductively connected with a signal receiving end of the first excitation device to send a trigger signal to the first excitation device; and the first excitation device disconnects the first conductor according to the received trigger signal. The first excitation device is used as a backup protection of the first fuse body, and the working reliability of the protection device is improved.

Description

Technical Field

[0001] This invention relates to the fields of power control and electric vehicles, and in particular to protection devices for circuit protection. Background Technology

[0002] Most current circuit protection devices that disconnect circuits mechanically do so by being triggered by an external signal. This involves an excitation source, a disconnecting device, and a conductor through which current flows. The excitation source receives the external trigger signal, ignites it to release high-pressure gas, and drives the disconnecting device to cut off the conductor.

[0003] Another type uses a trigger signal generated by the protection device itself to activate the excitation source, mechanically disconnecting the circuit. The difference between this and using an external trigger signal is the addition of a trigger circuit to acquire the internal trigger signal. This type of protection device can withstand higher voltages and larger currents.

[0004] However, both of these protection devices have certain drawbacks. If the external trigger signal circuit or the device's own trigger circuit malfunctions, or if the excitation source fails, the lack of a mechanical means to cut off the current could lead to serious safety accidents. Therefore, the reliability of both products is unstable. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated active and passive protection device. By connecting a first fusible element in series with a conductor, when the first fusible element melts without arcing, the circuit is directly disconnected by the fusible element. When arcing occurs, an arc voltage-driven trigger circuit is connected to an excitation source, providing a trigger signal to the excitation source. The excitation source then mechanically disconnects the circuit. This invention's protection device disconnects the circuit through a combination of fusible element melting and mechanical disconnection, providing an additional layer of protection and improving the reliability of the protection device.

[0006] To achieve the above objectives, the present invention provides a highly reliable integrated active and passive protection device, comprising a first conductor, a first melt, a second conductor, and a first excitation device connected in series; the first melt is connected in parallel with a first triggering circuit; under normal operating conditions of the first melt, the first triggering circuit and the first excitation device are not connected.

[0007] When the first melt breaks, the first melt disconnects the circuit, or under the action of arc energy or elastic force, it can drive the first trigger circuit to be electrically connected to the signal receiving end of the first excitation device to send a trigger signal to the first excitation device; the first excitation device disconnects the first conductor according to the received trigger signal.

[0008] Preferably, the signal receiving end of the first excitation device is electrically connected to the external signal triggering circuit so that the first excitation device can send a trigger signal.

[0009] Preferably, when the first melt breaks and the arc is held, after the signal receiving end of the first excitation device is disconnected from the external signal triggering circuit, it is electrically connected to the first triggering circuit to provide a trigger signal for the first excitation device.

[0010] Preferably, a third trigger circuit is connected in parallel at the first melt, and the third trigger circuit is electrically connected to the first excitation device; when the first melt is working normally, the third trigger circuit does not send a trigger signal to the first excitation device, and when the first melt melts, the third trigger circuit sends a trigger signal to the first excitation device.

[0011] Preferably, it further includes a second excitation device, which receives a trigger signal and disconnects the first conductor; the first melt is also connected in parallel with a second trigger circuit, which is electrically connected to the signal receiving end of the second excitation device; when the first melt is in normal working condition, the second trigger circuit does not send a trigger signal to the second excitation device; when the first melt melts, the second trigger circuit sends a trigger signal to the second excitation device.

[0012] Preferably, the second excitation device includes a second excitation source and a second cutting device. The first melt is inserted into the first melt shell. When the first melt melts, the second trigger circuit is turned on to send an excitation signal to the second excitation source. The second excitation source is activated, driving the second cutting device to move, which in turn drives the first melt shell to move the first melt as a whole, disengaging it from the first conductor and the second conductor.

[0013] Preferably, a transmission device is also provided, and a first switching device is provided at one end of the wire of the first trigger circuit or the first excitation device. When the first molten element melts, the transmission device can be driven to operate under the action of arc energy or elastic force. The transmission device drives the first switching device to operate, so that the first trigger circuit and the signal receiving end of the first excitation device are electrically connected to provide a trigger signal for the first excitation device.

[0014] Preferably, a first switching device is conductively connected to the signal receiving end of the first excitation device, and the first excitation device is conductively connected to an external trigger signal circuit through the first switching device; when the first molten element melts, the transmission device is driven to operate under the action of arc energy or elastic force, and the transmission device drives the first switching device to operate to disconnect the connection between the first excitation device and the external trigger signal circuit, so that the wires of the first trigger circuit and the first excitation device are conductively connected through the first switching device.

[0015] Preferably, the first switching device consists of two conductive connectors, with both ends of the conductive connectors being conductively connected to an external trigger signal circuit and a signal receiving end of the first excitation device, respectively, via wires. When the first molten metal melts, the arc energy it generates drives the transmission device to operate. After the transmission device disconnects the conductive connectors, it drives the portion of the conductive connectors that is conductively connected to the first excitation device to be conductively connected to the first trigger circuit.

[0016] Preferably, the first melt is connected in parallel with a second melt; the transmission device includes a spring and a piston structure; the second melt binds the spring in a compressed state; when the first melt melts and the second melt melts, the piston structure moves under the action of elastic force, driving the first trigger circuit to be electrically connected to the signal receiving end of the first excitation device to provide a trigger signal for the first excitation device.

[0017] Preferably, the first melt or the second melt is located in the cavity, and the transmission device closes the cavity.

[0018] Preferably, the transmission device is a flexible membrane that encloses the first melt or the second melt; or the transmission device is a piston structure.

[0019] Preferably, the cavity containing the first melt or the second melt is filled with an arc-extinguishing medium.

[0020] Preferably, the first trigger circuit includes a transformer, wherein the high-voltage end circuit of the transformer is connected in parallel with the first fusible element, and the low-voltage end circuit of the transformer is not connected to the first excitation device; when the first fusible element is working normally, the low-voltage end circuit of the transformer is not connected to the first excitation device; when the first fusible element melts, the arc energy generated by the melting of the first fusible element can drive the low-voltage end circuit of the transformer to be electrically connected to the signal receiving end of the first excitation device, and the first trigger circuit sends a trigger signal to the first excitation device.

[0021] Preferably, a continuity detection device for controlling the on / off state of the control circuit is connected in series in the high-voltage end circuit of the transformer.

[0022] Preferably, the continuity detection device is an active or passive device.

[0023] The highly reliable active-passive integrated protection device of the present invention, under normal conditions, has a non-conductive first trigger circuit and a disconnected first excitation device from the first trigger circuit; current flows through the first conductor and the first fusible element used for current detection. When the first fusible element melts and the arc is not sustained at the melt point, the circuit is disconnected, and neither the first trigger circuit nor the first excitation device operates. When the first fusible element melts and the arc is sustained at the melt point, the arc energy generated by the melt drives the first trigger circuit to connect with the first excitation device, sending the voltage signal at the first fusible element as a trigger signal to the first excitation device. The first excitation device then operates, mechanically disconnecting the first conductor and breaking the circuit.

[0024] The first excitation device is connected to an external trigger signal, which provides a trigger signal to the first excitation device. When the first fusible element melts and the first excitation device fails to disconnect the circuit by cutting off the first conductor, an arc remains at the point where the first fusible element melts. The arc energy generated by the melting of the first fusible element drives the first trigger circuit to conduct and provide a trigger signal to the first excitation device. The first excitation device then activates to mechanically disconnect the circuit. By adding an external trigger circuit to provide an external trigger signal and a self-excitation signal generated by the melting of the first fusible element, dual protection is achieved.

[0025] By adding a second trigger circuit and a second excitation device, an additional circuit disconnection guarantee is added on the basis of the first excitation device and the first fuse, ensuring that the protection device can disconnect the circuit and ensuring the safety and reliability of the protection device.

[0026] The protection device of this invention can actively disconnect the circuit or passively disconnect the circuit when a fault occurs. Through multiple protection mechanisms, the reliability of the protection device is improved, making it suitable for various application scenarios, including low-voltage and high-voltage applications. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the circuit principle of the first switch connected to the first excitation device in Embodiment 1.

[0028] Figure 2 yes Figure 1 The schematic diagram of the circuit principle after the first trigger circuit is connected to the first excitation device after the action.

[0029] Figure 3 This is a circuit diagram of the first switch connected to the first trigger circuit in Embodiment 1.

[0030] Figure 4 This is a circuit diagram of the first switch connected to the first trigger circuit in Embodiment 2.

[0031] Figure 5 This is a schematic diagram of the circuit principle of Embodiment 3 with the addition of an external trigger circuit.

[0032] Figure 6 This is a schematic diagram of the circuit principle of the first triggering circuit, which includes a transformer, in Embodiment 3.

[0033] Figure 7 It is Example 3 Figure 6 Circuit diagram after the first fuse melts.

[0034] Figure 8 This is the circuit schematic diagram of Example 4 under normal operating conditions.

[0035] Figure 9This is the circuit diagram of Embodiment 5 with the addition of a second excitation device and a second trigger circuit.

[0036] Figure 10 yes Figure 9 The circuit diagram after the first fuse in the circuit breaks.

[0037] Figure 11 This is a circuit diagram of the second excitation device in Embodiment 6, which is installed on the second conductor.

[0038] Figure 12 This is a schematic diagram of the external structure of the transmission device in Example 7.

[0039] Figure 13 yes Figure 12 A cross-sectional structural diagram of the transmission device.

[0040] Figure 14 yes Figure 13 A schematic diagram of the AA cross-sectional structure.

[0041] Figure 15 This is the circuit diagram of Example 8, which has a second fused element connected in parallel.

[0042] Figure 16 yes Figure 15 A schematic diagram of a transmission device.

[0043] Figure 17 yes Figure 15 Schematic diagram of the second excitation device.

[0044] The components include: first conductor 10, first molten metal 20, second conductor 30, second molten metal 100, first excitation device 40, first excitation source 401, first wire 4011, second wire 4012, external trigger circuit 450, unidirectional conduction device 4501, first switch 50, first trigger circuit 60, third wire 601, fourth wire 602, transformer 603, rectifier bridge 604, continuity detection device 605, transmission device 70, piston structure 701, arc extinguishing chamber 702, protrusion 703, wiring groove 704, spring 705, insulating bottom cover 706, second excitation device 80, second excitation source 801, second cutting-off device 802, second trigger circuit 90, and continuity detection device 901. Detailed Implementation

[0045] The structural directional terms used in the instruction manual, such as up, down, left, right, front, back, top, and bottom, do not restrict the structural position and are only for ease of understanding.

[0046] Regarding the above technical solutions, preferred embodiments are now described in detail with reference to the figures.

[0047] Example 1

[0048] See Figure 1 A highly reliable integrated active and passive protection device includes a first conductor 10, a first fusible element 20, and a second conductor 30 connected in series. Current flows through the first conductor 10, the first fusible element 20, and the second conductor 30. The first fusible element 20 is required to melt under small fault current conditions, thus breaking the circuit through which current flows through the first conductor, the first fusible element, and the second conductor.

[0049] The first excitation device 40 is disposed on one side of the first conductor 10. A weak point 101 can be provided on the first conductor 10 located at the first excitation device 40 as needed to reduce mechanical strength. When the first excitation device 40 receives a trigger signal, it operates according to the trigger signal and cuts the first conductor 10 at the weak point.

[0050] The first excitation device 40 includes a first excitation source 401 and a first cutting-off device. The first excitation source and the first cutting-off device are disposed in a housing, and the first conductor 10 passes through the housing. The structure between the first excitation source and the first cutting-off device is such that after the first excitation source receives a trigger signal, the driving force released can drive the first cutting-off device to displace and cut off the first conductor, thus breaking the circuit.

[0051] The first excitation source 401 is a gas generator. The signal receiving end of the first excitation source 401 is connected to the first wire 4011 and the second wire 4012 respectively. The free ends of the first wire 4011 and the second wire 4012 are electrically connected to the first switch 50.

[0052] The first excitation source 401 heats up upon receiving a trigger signal, then ignites, releasing high-pressure gas. The high-pressure gas drives the first cutting device to cut off the first conductor 10, thus disconnecting the circuit.

[0053] A first trigger circuit 60 is connected in parallel to the first melt 20. The first trigger circuit is connected to one end of the first melt 20 via a third wire 601 and a fourth wire 602, respectively. The third wire 601 and the fourth wire 602 are not connected. The first trigger circuit 60 collects the voltage signal at the first melt 20 as a trigger signal. When the first melt is in normal working condition, the first trigger circuit is not conducting because the third conductor 601 and the fourth wire 602 are not connected. The first trigger circuit is also not connected to the first switch 50 on the first excitation source 401 via a wire.

[0054] The first excitation source is a gas generating device, which ignites the gas according to the received trigger signal and then releases high-pressure gas to generate driving force. In the following embodiments, the excitation source is the same as in Embodiment 1.

[0055] Working principle:

[0056] Under normal operating conditions, current flows through the first fusible element 20, and the voltage across the first fusible element 20 is very small. When a fault current occurs, the first fusible element 20 melts first. When the fault current is small, the arc generated at the point where the first fusible element 20 melts is very small and is quickly extinguished by air or by an arc-extinguishing medium located at the first fusible element. The melting of the first fusible element breaks the circuit through which the current flows. In this case, because the arc is small and extinguishes quickly, the arc energy is also very small and cannot drive the first switch 50 to make a conductive connection with the first trigger circuit, thus turning on the first trigger circuit. Therefore, neither the first trigger circuit nor the first excitation device operates.

[0057] When the fault current is relatively large, the arc generated when the first fusible element 20 melts cannot be extinguished quickly, and an arc-holding occurs at the point where the first fusible element melts. Under the energy of the arc, the first switch 50 is driven to displace and connect with the third and fourth wires of the first trigger circuit 60, thus connecting the first trigger circuit with the first excitation device. (See [reference]) Figure 2 The first trigger circuit sends the voltage across the first melt as a trigger signal to the first excitation source of the first excitation device. The first excitation source activates and drives the first cut-off switch to mechanically disconnect the first conductor 10 to form a break, thus breaking the circuit through which current flows through the first conductor, the second conductor, and the first melt.

[0058] When the electric arc energy drives the first switch 50 to move, a transmission device 70 is provided between the first melt and the first switch 50. (See attached image) Figures 8 to 11 The conduction device can effectively isolate the electric arc energy, keeping it isolated around the first melt and preventing it from escaping and causing damage to other components or devices.

[0059] The conductive device can be a flexible membrane covering the first molten material, and the flexible membrane is made of insulating material. An arc-extinguishing medium is filled between the flexible membrane and the first molten material. When the first molten material melts, the generated arc energy drives the flexible membrane to expand, disconnecting the first switch 50 through the flexible membrane. Then, it drives one end connected to the first excitation source to move towards one end of the wire of the first trigger circuit and connects to the conductive connection of the first trigger circuit, thus connecting the first excitation source and the first trigger circuit. The first trigger circuit sends the voltage signal across the first molten material as a trigger signal to the first excitation source, causing the first excitation source to operate.

[0060] The transmission device can be a piston structure, in which the first molten material is placed in a cavity filled with an arc-extinguishing medium, and the piston structure seals the cavity. The piston structure is made of insulating material. When the first molten material melts, the generated arc energy drives the piston structure to displace, disconnecting the first switch 50. Then, the piston structure drives one end connected to the first excitation source to move towards the wire end of the first trigger circuit, establishing a conductive connection with the first trigger circuit. This connects the first excitation source to the first trigger circuit, and the first trigger circuit sends the voltage signal across the first molten material as a trigger signal to the first excitation source, causing the first excitation source to operate.

[0061] The transmission device can also be a hydraulic transmission.

[0062] The first switch 50 can also be connected to one end of the first trigger circuit, see [link / reference] Figure 3 Its structure and operating principle are the same as those connected to the first excitation device.

[0063] In this example, the circuit is disconnected by the melting of a first fusible element. In the case where the circuit cannot be disconnected when the first fusible element melts, the arc energy generated when the first fusible element melts drives the first trigger circuit to connect with the first excitation device, providing a trigger signal to the first excitation device and disconnecting the first conductor to break the circuit. This embodiment employs dual protection to improve the reliability of the protection device.

[0064] Example 2

[0065] The difference from Embodiment 1 is the addition of an external trigger circuit 450. See [link / reference] Figure 4 The first switch 50 is connected to the first trigger circuit 60. The first excitation source 401 of the first excitation device 40 is electrically connected to the external trigger circuit 450 through the first wire 4011 and the second wire 4012.

[0066] The external trigger circuit 450 provides a trigger signal to the first excitation device 40, and the first excitation device disconnects the first conductor 10 to disconnect the circuit.

[0067] A first trigger circuit 60 is connected in parallel to the first molten element 20. The first trigger circuit 60 is connected to both ends of the first molten element 20 via a third conductor 601 and a fourth conductor 602, respectively. The third conductor 601 and the fourth conductor 602 are not connected. A first switch 50 is electrically connected to one end of the third conductor 601 and the fourth conductor 602. Current flows through the first conductor 10, the first molten element 20, and the second conductor 30.

[0068] The transmission device 70 is disposed between the first melt 20 and the first switch 50.

[0069] Under normal operating conditions, current flows through the first conductor 10, the first molten element 20, and the second conductor 30. The external trigger circuit 450 does not activate, and the first excitation device 40 does not activate.

[0070] When the operating conditions of the external trigger circuit 450 are met, a trigger signal is provided to the first excitation device through the external trigger circuit 450. After receiving the trigger signal, the first excitation device disconnects the first conductor 10. The operating conditions of the external trigger circuit 450 are determined according to external control conditions, i.e., the client's control system. The external control conditions may be sending a trigger signal under certain conditions when there is zero current, or setting a certain threshold. When the index exceeds the threshold, the external trigger circuit 450 is controlled to operate, providing a trigger signal to the first excitation device, triggering the first excitation device to disconnect the first conductor 10.

[0071] When a fault current occurs, the external trigger circuit 450 does not send a trigger signal to the first excitation source, and the first fuse 20 melts. If there is no arc at the melt point of the first fuse 20, the melted first fuse 20 disconnects the circuit.

[0072] If an arc is formed at the point where the first melt 20 melts, the accumulated arc energy drives the transmission device to drive the first switch 50 on the first trigger circuit 60 to move and connect conductively with the first excitation source signal receiving end of the first excitation device, so that the first trigger circuit is connected to the first excitation source and sends a trigger signal to the first excitation source 401. The first cutting device then cuts off the first conductor 10 and disconnects the circuit.

[0073] Since the first switch 50 of the first trigger circuit 60 is connected to the signal receiving end of the first excitation device 40 under the drive, and is also connected to the external trigger circuit 450, in order to prevent the high voltage at both ends of the first fuse 20 from affecting the external trigger circuit 045, a unidirectional conducting component, such as a diode, is provided in the external trigger circuit 450 to prevent current from flowing from the protection device to the external trigger circuit.

[0074] Example 3

[0075] An improvement was made based on Example 2. See [link / reference] Figure 5 A first melt 20 is connected in series between the first conductor 10 and the second conductor 30.

[0076] The first excitation device 40 is electrically connected to the external trigger circuit 450 via the first switch 50. The external trigger circuit 450 is prior art and will not be described in detail here.

[0077] A first trigger circuit 60 is connected in parallel to the first melt 20. The first trigger circuit 60 is connected to both ends of the first melt 20 through a third conductor 601 and a fourth conductor 602, respectively. The third conductor 601 and the fourth conductor 602 are not connected. The first trigger circuit 60 is not connected to the first excitation device 40 or the external trigger circuit 450.

[0078] Current flows through the first conductor 10, the first melt 20, and the second conductor 30.

[0079] An external trigger circuit 450 provides a trigger signal to the first excitation device. Upon receiving the trigger signal, the first excitation device disconnects the first conductor 10. The operating conditions of the external trigger circuit 450 are determined by external control conditions, i.e., the client's control system. These external control conditions can be sending a trigger signal under specific conditions (zero current) or setting a threshold value; when the index exceeds this threshold, the external trigger circuit 450 is activated to provide a trigger signal to the first excitation device, thus triggering the first excitation device to disconnect the first conductor 10.

[0080] If the first melt element 20 melts without generating an arc, then the first melt element 20 disconnects the circuit;

[0081] When the arc energy generated at the point where the first melt 20 melts is generated drives the transmission device 70 to operate. The displacement of the transmission device 70 drives the first switch 50 to disconnect the connection between the first excitation device 40 and the external trigger circuit 450. Then, the first switch 50 is driven to be electrically connected to the first trigger circuit 60, so that the first trigger circuit is electrically connected to the first excitation device, providing a trigger signal to the first excitation device.

[0082] To improve operational reliability, various components or circuits can be electrically connected to the third and fourth wires of the first trigger circuit to enhance operational reliability.

[0083] Figure 6 for Figure 5 In one specific circuit diagram, the third wire 601 and the fourth wire 602, connected to both ends of the first fuse 20, are electrically connected to the high-voltage side circuit 6031 of the transformer 603, so that the high-voltage side circuit of the transformer is connected in parallel with the first fuse 20. The low-voltage side circuit 6032 of the transformer is not connected to the first excitation source 401 of the first excitation device 40. A rectifier bridge 604 is connected in series in the low-voltage side circuit.

[0084] The signal receiving end of the first excitation source 401 of the first excitation device 40 is connected to the first switch 50 through the first wire 4011 and the second wire 4012 respectively, and the external trigger circuit 450 is electrically connected to the first excitation source 401 through the first switch 50.

[0085] Working principle:

[0086] Under normal operating conditions, the first trigger circuit 60 and the first excitation source are not connected. The external trigger circuit 450 does not send a trigger signal to the first excitation source.

[0087] When the operating conditions of the external trigger circuit 450 are met, a trigger signal is provided to the first excitation device through the external trigger circuit 450. After receiving the trigger signal, the first excitation device disconnects the first conductor 10. The operating conditions of the external trigger circuit 450 are determined according to external control conditions, i.e., the client's control system. The external control conditions may be sending a trigger signal under certain conditions when there is zero current, or setting a certain threshold. When the index exceeds the threshold, the external trigger circuit 450 is controlled to operate, providing a trigger signal to the first excitation device, triggering the first excitation device to disconnect the first conductor 10.

[0088] When a fault current occurs, if the external trigger circuit 450 does not send a trigger signal to the first excitation source, the first fuse 20 will melt and break. If there is no arc at the melt point of the first fuse 20, the melted circuit will be disconnected.

[0089] If an arc is formed at the point where the first melt 20 melts, see [reference] Figure 7 The accumulated arc energy drives the transmission device to disconnect the first switch from the external trigger circuit 450, making the first switch 50 conductively connected to the low-voltage end of the first trigger circuit 60, and making the first trigger circuit conduct to the first excitation source, sending a trigger signal to the first excitation source 401. The first cutting device then cuts off the first conductor 10, disconnecting the circuit.

[0090] To further improve operational reliability, a continuity detection device 605 is connected in series at the high-voltage end of the transformer. Under normal operating conditions, the continuity detection device 605 is not conducting. The continuity detection device 605 can be an active or passive device, or a continuity detection circuit capable of on / off control, such as a TVS diode or MOSFET. Continuity detection circuits capable of on / off control are conventional circuit technologies and will not be described in detail here. When the first fuse is operating normally, the continuity detection device 605 is not conducting. When the first fuse melts, the continuity detection device 605 conducts.

[0091] A unidirectional conduction device is connected in series on the external trigger circuit 450 to ensure that the trigger signal can only be sent from one end of the external trigger circuit 450 to the first excitation source 401.

[0092] Example 4

[0093] Figure 8 yes Figure 5 The circuit diagram adds an extra layer of protection to the existing circuit. See [link / reference]. Figure 8The first trigger circuit 60 includes a third wire 601 and a fourth wire 602 connected in parallel across the two ends of the first melt 20. The free ends of the third wire 601 and the fourth wire 602 are not connected, nor are they connected to the first excitation source 401. To improve the reliability of the first trigger circuit, various components or circuits can be electrically connected to the third wire and the fourth wire of the first trigger circuit as needed.

[0094] The external trigger circuit 450 is electrically connected to the first excitation source 401 via the first switch 50. When the first switch 50 is driven by an external force, it can be displaced and electrically connected to the third wire 601 and the fourth wire 602, thereby making the first excitation source 401 electrically connected to the first trigger circuit 60.

[0095] A third trigger circuit 60a is connected in parallel at the first fuse 20. The third trigger circuit 60a includes a transformer 60a-1 and a rectifier bridge 60a-2. The high-voltage end of the transformer 60a-1 is connected in parallel with the first fuse 20, and the low-voltage end is connected to the wires connecting the external trigger circuit 450 and the first excitation source 401. The rectifier bridge 60a-2 is connected in series in the low-voltage circuit, rectifying the transformed trigger signal and sending it to the first excitation source 401. The high-voltage and low-voltage ends of the transformer 60a-1 isolate the high-voltage and low-voltage components of the protection device, ensuring the safety and reliability of the device. Under normal operating conditions, because the voltage at the first fuse 20 is very small, the voltage at the low-voltage end of the transformer is extremely small, almost negligible. Therefore, under normal operating conditions, the third trigger circuit cannot send a trigger signal to the first excitation source, and the first excitation source does not activate. The third trigger circuit is not limited to... Figure 8 In the circuit structure, the structure of the third trigger circuit only needs to satisfy the condition that the first fuse melts and the third trigger circuit sends a trigger signal to the first excitation source.

[0096] Under normal operating conditions, current flows through the first conductor 10, the first melt 20, and the second conductor 30.

[0097] Working principle

[0098] Under normal operating conditions, the first trigger circuit 60 and the first excitation source 401 are not connected. The external trigger circuit 450 and the third trigger circuit do not send trigger signals to the first excitation source.

[0099] When the operating conditions of the external trigger circuit 450 are met, a trigger signal is provided to the first excitation device through the external trigger circuit 450. After receiving the trigger signal, the first excitation device disconnects the first conductor 10. The operating conditions of the external trigger circuit 450 are determined according to external control conditions, i.e., the client's control system. The external control conditions may be sending a trigger signal under certain conditions when there is zero current, or setting a certain threshold. When the index exceeds the threshold, the external trigger circuit 450 is controlled to operate, providing a trigger signal to the first excitation device, triggering the first excitation device to disconnect the first conductor 10.

[0100] When a fault current occurs, if the external trigger circuit 450 does not send a trigger signal to the first excitation source, the first fuse 20 will melt and break. If there is no arc at the point where the first fuse 20 melts, the circuit will be disconnected.

[0101] If an arc is formed at the point where the first melt 20 is melted, the voltage at the point where the first melt is melted will suddenly increase. The transformer of the third trigger circuit 60a will transform the high voltage at the point where the first melt is melted into a low voltage, and after rectification, send it to the first excitation source 401 as a trigger signal. The first excitation source 401 will activate and drive the first cutting device to disconnect the first conductor 10 and disconnect the circuit.

[0102] If the first molten element 20 melts, before the circuit is disconnected, the accumulated arc energy drives the transmission device 70 to operate, disconnecting the connection between the first switch 50 and the external trigger circuit 450, making the first switch 50 electrically connected to the first trigger circuit 60, thereby making the first trigger circuit 60 conductive with the first excitation source 401, sending the voltage signal at the melting point of the first molten element as a trigger signal to the first excitation source 401, the first excitation source 401 operates, and the first cutting device operates to cut off the first conductor 10 and disconnect the circuit.

[0103] To further improve operational reliability, a continuity detection device 60a-3 is connected in series at the high-voltage end of the transformer. Under normal operating conditions, the continuity detection device 60a-3 is not conductive. The continuity detection device 60a-3 can be an active or passive device, or a continuity detection circuit capable of on / off control, such as a TVS diode or MOSFET. Continuity detection circuits capable of on / off control are conventional circuit technologies and will not be described in detail here. When the first fuse is operating normally, the continuity detection device 60a-3 is not conductive. When the first fuse melts, the continuity detection device 60a-3 conducts.

[0104] A unidirectional conducting device is connected in series on the external trigger circuit 450 to ensure that the trigger signal can only be sent from one end of the external trigger circuit 450 to the first excitation source 401. In this embodiment, by adding a third trigger circuit, the protection device has an additional backup protection, forming quadruple protection, which improves reliability.

[0105] The specific circuit structure of the third trigger circuit is not limited to setting a transformer and rectifier bridge in the circuit. As long as it can ensure that the third trigger circuit does not send a trigger signal when the first melt is working normally, and sends a trigger signal after the first melt melts.

[0106] Example 5

[0107] See Figure 9 ,exist Figure 5 Based on this, a second excitation device 80 is also provided on one side of the first conductor 10, and a second trigger circuit 90 is connected in parallel on the first melt 20. The second trigger circuit 90 and the second excitation source 801 of the second excitation device 80 are electrically connected through a wire. The second excitation device 80 includes a second excitation source 801 and a second cutting device 802. The second excitation source acts according to the trigger signal sent by the second trigger circuit, driving the second cutting device to cut off the first conductor 10 and disconnect the circuit.

[0108] The first trigger circuit 60 and Figure 5 The first trigger circuit 60 is the same as that in the previous example. The specific implementation circuit of the second trigger circuit 90 can be found in Example 4. Figure 8 The structure of the third trigger circuit 60a is shown. The second trigger circuit 90 is not limited to... Figure 8 The structure of the third trigger circuit 60a is sufficient as long as it does not send a trigger signal to the second excitation device when the first melt is working normally.

[0109] During normal operation, current flows through the first conductor 10, the first melt 20, and the second conductor 30.

[0110] Working principle:

[0111] When the first melt is working normally, current flows through the first conductor 10, the first melt 20, and the second conductor 30. The first trigger circuit 60 is not connected to the first excitation device 40, and the first excitation device does not operate; because the voltage at the first melt is very low, the second trigger circuit does not send a trigger signal to the second excitation device, and the second excitation device also does not operate.

[0112] When the operating conditions of the external trigger circuit 450 are met, a trigger signal is provided to the first excitation device 40 through the external trigger circuit 450. Upon receiving the trigger signal, the first excitation device disconnects the first conductor 10. The operating conditions of the external trigger circuit 450 are determined according to external control conditions, i.e., the client's control system. The external control conditions may be sending a trigger signal under certain conditions when there is zero current, or setting a certain threshold. When the index exceeds the threshold, the external trigger circuit 450 is controlled to operate, providing a trigger signal to the first excitation device, triggering the first excitation device to disconnect the first conductor 10.

[0113] When a fault current occurs, if the external trigger circuit 450 does not send a trigger signal to the first excitation source, the first fuse 20 will melt and break. If there is no arc at the point where the first fuse 20 melts, the circuit will be disconnected.

[0114] If an arc is formed at the point where the first melt 20 melts, the voltage at the point where the first melt melts will suddenly increase. The second trigger circuit 90 will send the voltage signal at the point where the first melt melts as a trigger signal to the second excitation source 801. The second excitation source 801 will then activate and drive the second cutting device to disconnect the first conductor 10 from the circuit.

[0115] If the first molten element 20 melts, before the circuit is disconnected, the accumulated arc energy drives the transmission device 70 to operate, disconnecting the connection between the first switch 50 and the external trigger circuit 450, making the first switch 50 electrically connected to the first trigger circuit 60, thereby making the first trigger circuit 60 conductive with the first excitation source 401, sending the voltage signal at the melting point of the first molten element as a trigger signal to the first excitation source 401, the first excitation source 401 operates, and the first cutting device operates to cut off the first conductor 10 and disconnect the circuit.

[0116] By adding a second trigger circuit and a second excitation device, when the first molten element 20 melts, the second trigger circuit activates first, sending a trigger signal to the second excitation device, which then activates first. Only when the arc energy accumulated after the first molten element 20 melts drives the first switch to activate, connecting the first trigger circuit and the first excitation device, will the first excitation device activate.

[0117] To further improve the reliability of the second trigger circuit, a continuity detection device 901 is connected in series in the second trigger circuit 90. The continuity detection device 901 can be an active or passive device, or a continuity detection circuit that can realize on / off control, such as a TVS diode or a MOSFET. The continuity detection circuit that can realize on / off control is a conventional circuit technology and will not be described in detail here. When the first fuse is working normally, the continuity detection device 901 is not conducting; when the first fuse melts, the continuity detection device 901 conducts.

[0118] This embodiment, through two sets of excitation devices and two sets of trigger circuits, combined with an external trigger circuit, can ensure that if one of the trigger circuits or the excitation source fails, the other excitation source can act to cut off the circuit, thereby improving the reliability of the product.

[0119] Figure 9 The second trigger circuit and the second excitation device in it can also be based on Figure 8 Add on the basis, Figure 8 Based on this, a second trigger circuit and a second excitation device are added, forming a protection device with five layers of protection.

[0120] Example 6

[0121] See Figure 11 ,exist Figure 9 Based on the above, a second excitation device 80 is installed on the second conductor 30, with the rest of the structure remaining the same. When the first excitation device is activated, it cuts off the first conductor 10; when the second excitation device 80 is activated, it cuts off the second conductor 30.

[0122] The working principle is the same as in Example 5.

[0123] Example 7

[0124] In this embodiment, the structure of the transmission device is described. See [link / reference] Figures 12 to 14 The transmission device 70 is located at the first melt 20. The transmission device 70 includes an insulating housing with a cavity open at one end. The first melt 20 passes through the cavity. A piston structure 701 seals the cavity containing the first melt 20 to form an arc-extinguishing chamber 702. The arc-extinguishing chamber 702 is filled with an arc-extinguishing medium, such as sand. A certain displacement distance is maintained between the impact end face of the piston structure 701 and the opening end of the cavity. The piston structure 701 is made of insulating material.

[0125] The piston structure 701 has a limiting structure at its contact surface with the housing of the transmission device. For example, a protrusion 703 is provided at the contact surface of the piston structure 701, and a groove is provided at the contact surface of the housing of the transmission device. The protrusion is embedded in the groove to form a limiting structure, thereby maintaining the initial position of the piston structure 701. A sliding groove is provided on the inner peripheral wall of the housing of the transmission device, and the piston structure 701 is engaged in the sliding groove and can move along the sliding groove. The piston structure 701 and the housing of the transmission device are in sealed contact, which can be achieved by a sealing ring or an interference fit. When the piston structure 701 is driven to move by the arc energy generated by the melting of the first melt, the arc-extinguishing medium in the arc-extinguishing chamber 702 will not leak due to the sealing effect of the piston structure 701.

[0126] The third wire 601 and the fourth wire 602 of the first trigger circuit 60 are disposed on the outer periphery of the housing of the transmission device, and are electrically connected to the first conductor 10 and the second conductor 30, respectively, by welding, bolting, or other means. One end of the third wire 601 and the fourth wire 602 is bent in front of the piston structure 701 in the displacement direction, and sufficient insulation distance is maintained between them. Figure 7 As shown.

[0127] The first switch 50 is located in front of the impact end face displacement of the piston structure 701. The first switch 50 includes two conductive connectors 501 arranged in parallel and spaced apart, and the conductor connectors 501 are provided with weak points 5011 to reduce mechanical strength.

[0128] The conductive connector 501 is disposed at one end of the cavity opening of the transmission device housing, maintaining sufficient insulation distance from the third wire 601 and the fourth wire 602. The conductive connector 501 is located between the third wire 601 and the fourth wire 602 and the impact end face of the piston structure 701. When the piston structure 701 is displaced, the conductive connector 501 is disconnected, driving the conductive connector portion connected to the first excitation source to displace, making it conductively contact the third wire 601 and the fourth wire 602, thus making the first trigger circuit conductively connected to the first excitation device.

[0129] A wiring groove 704 is provided on the outer periphery of the housing of the transmission device 70. The first wire 4011 and the second wire 4012 pass through the wiring groove 704 and are electrically connected to one end of the conductive connector 501. Alternatively, the conductive connector 501 can be extended directly to connect directly to the first excitation source without connecting it to the first excitation source via a wire.

[0130] One end of the conductive connector 501 is connected to the signal receiving end of the first excitation source 401 via a wire, and the other end is a free end, or the other end of the conductive connector 501 can also be conductively connected to the external signal triggering circuit 450.

[0131] When the fault current is small, the first fusible element 20 melts, generating a small arc that can be extinguished instantly. The first fusible element 20 disconnects the circuit. Since the generated arc energy is small, it cannot drive the piston structure to move, so the first excitation device does not operate. When the fault current is large, the first fusible element 20 melts, generating a larger arc. An arc is formed at the point where the first fusible element melts, so the circuit cannot be disconnected by the melting of the first fusible element. At this time, the generated arc energy is relatively large, which can drive the piston structure 701 to overcome the limiting structure and move to move, cutting off the weak point of the disconnected conductive connector 501. The piston structure 701 continues to drive the conductive connector 501 connected to the first excitation source 401 to partially move and make conductive connections with the third and fourth wires, connecting the first trigger circuit and the first excitation device.

[0132] Example 8

[0133] This embodiment is a modification based on embodiment 5.

[0134] The first melt 20 is connected in series between the first conductor 10 and the second conductor 30. See also Figure 15The second excitation device 80 is located at the first melt 20, meaning the first melt 20 is located inside the second excitation device 80. A second trigger circuit 90 is connected in parallel across the two ends of the first melt 20 located outside the second excitation device 80, and is electrically connected to the second excitation source 801. When the first melt 20 melts, the second trigger circuit sends a trigger signal to the second excitation source, which then activates, driving the second cutting device to cut the first melt 20. Because the second cutting device is made of insulating material, it is located at the point of breakage when it breaks the first melt 20, thus insulating and isolating that point.

[0135] An arc-extinguishing medium is provided at the first melt 20 in the second excitation device 80. The structure of the second cutting device disconnecting the first melt provided in the arc-extinguishing medium is prior art and will not be described in detail here.

[0136] A second melt 100 is connected in parallel at both ends of the first melt 20 located outside the second excitation device 80. The resistance of the second melt 100 is higher than that of the first melt 20, such as constantan wire. A transmission device 70 is provided at the second melt 100. The operation of the transmission device 70 cuts off the connection between the external trigger circuit and the first excitation source, and drives the first trigger circuit to make a conductive connection with the first excitation source.

[0137] Under normal operating conditions, current flows through the first molten element 20, while only a small portion of the current flows through the second molten element 100. Therefore, the resistance of the second molten element 100 is much greater than that of the first molten element 20. When the first molten element 20 melts, most of the current flowing through it passes through the second molten element 100, causing it to melt as well. The melting of the second molten element can then drive the transmission device 70 to operate.

[0138] When the second melt breaks, if the transmission device 70 is driven to operate by the electric arc energy, the structure of the transmission device 70 can refer to the transmission device structure of Embodiment 7.

[0139] In this example, another transmission device structure will be described. See [link / reference] Figure 16The transmission device 70 includes a housing and a cavity with one open end. The bottom of the cavity is an insulating cover 706. A spring 705, an insulating piston structure 701, a conductive connector 501, a first wire 4011, and a second wire 4012 are disposed within the cavity. The insulating cover 706 closes one end of the housing. One end of the spring 705 is fixedly mounted on the insulating cover 706. The piston structure 701 is located at the other end of the spring 705. The second molten metal 100 passes through the insulating cover 706 and the spring 705, and then through the piston structure 701, which is secured by a hook. The piston structure 701 compresses the spring 705 between the insulating cover 706 and the piston structure 701. The piston structure 701 closes the cavity, and under external force, it can move along the housing. The cavity between the piston structure 701 and the insulating cover 706 is filled with an arc-extinguishing medium.

[0140] One end of the third wire 601 and the fourth wire 602 of the first trigger circuit 60 are located at the end face of the cavity opening of the transmission device 70 housing, in front of the piston structure 701 in the displacement direction, and are kept at a sufficient insulation distance from each other. The other ends of the third wire 601 and the fourth wire 602 are respectively connected to the two ends of the first melt 20 located outside the second excitation device. The connection is made by welding, bolting or other means. The first trigger circuit 60 and the first melt 20 are connected in parallel.

[0141] The first switch 50 includes two conductive connectors 501 arranged in parallel and spaced apart, and the conductor connectors 501 are provided with weak points that reduce mechanical strength.

[0142] The conductive connector 501 is disposed at one end of the cavity opening of the transmission device housing, maintaining sufficient insulation distance from the third wire 601 and the fourth wire 602. The two conductive connectors 501 are located between the third wire 601 and the fourth wire 602 and the impact end face of the piston structure 701. When the piston structure 701 is displaced, the conductive connector 501 is disconnected, driving the conductive connector 501 at the end connected to the first excitation source 401 to partially displace, making it conductively contact the third wire 601 and the fourth wire 602 respectively, thus making the first trigger circuit 60 conductively connected to the first excitation device 40.

[0143] See Figure 17The second excitation device 80 includes a housing, a second excitation source 801, a second cutting device 802, and a first molten metal 20 located within the housing. The second trigger circuit 90 is electrically connected to the signal receiving end of the second excitation source 801 via a wire. A weak point, a V-shaped notch, is provided at the adjacent ends of the first conductor 10 and the second conductor 30 to reduce mechanical strength. Inside the housing of the second excitation device 80, a first molten metal housing 201 is provided around the outer periphery of the first molten metal 20, and the first molten metal housing 201 is engaged at the weak point at the adjacent ends of the first conductor 10 and the second conductor 30. The first molten metal housing 201 is filled with an arc-extinguishing medium. The first molten metal housing 201 and the second cutting device are made of insulating material. The first molten metal housing 201 can be displaced relative to the housing of the second excitation device under external force.

[0144] When the first molten element 20 melts, the second trigger circuit 90 is activated. The second trigger circuit 90 collects the voltage of the first molten element 20 as a trigger signal and sends it to the second excitation source 801. The second excitation source 801 activates, driving the second cutting device 802 to move, which in turn drives the first molten element housing 201 to move, breaking at the weak point adjacent to the first conductor 10 and the second conductor 30. The arc generated when the first molten element 20 melts is extinguished by the arc-extinguishing medium.

[0145] Working principle:

[0146] Under normal operating conditions, current flows through the first conductor 10, the first melt 20, and the second conductor 30.

[0147] When a fault current occurs, the first fusible element 20 melts and breaks. After the first fusible element 20 melts and breaks, the second trigger circuit 90 is turned on and sends a trigger signal to the second excitation source of the second excitation device. After the second excitation source is activated, it drives the second cutting device to drive the first fusible element housing 201 to move and break from the weak point at the adjacent end of the first conductor and the second conductor. The first fusible element housing 201 drives the first fusible element to separate from the first conductor and the second conductor. The electric arc generated by the first fusible element is extinguished in the arc-extinguishing medium inside the first fusible element housing 201.

[0148] After the first molten element 20 melts, current flows through the second molten element 100. When the second molten element 100 melts, the spring 705 is released from its restraint. Under the action of the elastic force, the piston structure 701 displaces and cuts off the conductive connector 501, driving the disconnected conductive connector 501 to displace and connect conductively to the third and fourth wires respectively. This connects the first trigger circuit and the first excitation device, sending a trigger signal to the first excitation device. The first excitation device then activates, disconnecting the first conductor 10 from the circuit. The arc generated by the melting of the second molten element 100 is extinguished in the arc-extinguishing medium.

[0149] By connecting a second molten element in parallel with the first molten element, the transmission device is not constrained to be located on one side of the first molten element. Depending on the actual structural requirements, the transmission device can be located away from the first molten element. Simultaneously, because the second molten element, which has a relatively high resistance, is connected in parallel, the current flowing through it is reduced. When the second molten element melts, the resulting arc is smaller and has less energy, making it easier to extinguish the arc and disconnect the circuit. Therefore, with the second molten element connected in parallel, the arc energy at the second molten element is reduced. To ensure the first trigger circuit and the first excitation source are connected, using spring force as the driving force is preferable.

[0150] Alternatively, the second melt 100 can be disconnected, and the piston structure 701 can be bound to the first melt 20. The piston structure 701 can be unbound by melting the first melt 20, and driven to move under the action of elastic force.

Claims

1. A highly reliable integrated active and passive protection device, characterized in that, It includes a first conductor, a first melt, a second conductor, and a first excitation device connected in series. The first melt is connected in parallel with a first trigger circuit; the first trigger circuit is connected to the first excitation device through a mechanical switch; the signal receiving end of the first excitation device is also electrically connected to an external signal trigger circuit to send a trigger signal to the first excitation device. When the first melt is in normal working condition, the first trigger circuit is not connected and the mechanical switch is in the open state, so that the first trigger circuit and the first excitation device are not connected. When the first melt breaks, the first melt disconnects the circuit. Under the action of arc energy or elastic force, it can drive the mechanical switch to close, so that the first trigger circuit is connected to the signal receiving end of the first excitation device and sends a trigger signal to the first excitation device. Alternatively, an external signal triggering circuit may send a trigger signal to the first excitation device; The first excitation device disconnects the first conductor according to the received trigger signal.

2. The high-reliability active-passive integrated protection device according to claim 1, characterized in that, When the first melt breaks and the arc is held, the signal receiving end of the first excitation device is disconnected from the external signal triggering circuit, and then electrically connected to the first triggering circuit to provide a trigger signal for the first excitation device.

3. The high-reliability active-passive integrated protection device according to claim 2, characterized in that, A third trigger circuit is connected in parallel at the first melt, and the third trigger circuit is electrically connected to the first excitation device. When the first melt is working normally, the third trigger circuit does not send a trigger signal to the first excitation device. When the first melt melts, the third trigger circuit sends a trigger signal to the first excitation device.

4. The high-reliability active-passive integrated protection device according to claim 2, characterized in that, It also includes a second excitation device, which receives a trigger signal and disconnects the first conductor; The first melt is also connected in parallel with a second trigger circuit, which is electrically connected to the signal receiving end of the second excitation device; When the first melt is in normal working condition, the second trigger circuit does not send a trigger signal to the second excitation device; when the first melt melts, the second trigger circuit sends a trigger signal to the second excitation device.

5. The high-reliability active-passive integrated protection device according to claim 4, characterized in that, The second excitation device includes a second excitation source and a second cutting device. The first melt is inserted into the first melt shell. When the first melt melts, the second trigger circuit is turned on to send an excitation signal to the second excitation source. The second excitation source is activated, driving the second cutting device to move, which in turn drives the first melt shell to move the first melt as a whole, disengaging it from the first conductor and the second conductor.

6. The high-reliability active-passive integrated protection device according to any one of claims 1 to 5, characterized in that, A transmission device is also provided, and a first switch device is provided at one end of the wire of the first trigger circuit or the first excitation device. When the first molten element melts, the transmission device can be driven to operate under the action of arc energy or elastic force. The transmission device drives the first switch device to operate, so that the first trigger circuit and the signal receiving end of the first excitation device are electrically connected to provide a trigger signal for the first excitation device.

7. The high-reliability active-passive integrated protection device according to claim 6, characterized in that, The first excitation device is conductively connected to the signal receiving end of the first excitation device, and the first excitation device is conductively connected to the external trigger signal circuit through the first switch device. When the first molten element melts, the transmission device is driven to operate under the action of arc energy or elastic force. The transmission device drives the first switch device to operate and disconnect the connection between the first excitation device and the external trigger signal circuit, so that the wires of the first trigger circuit and the first excitation device are conductively connected through the first switch device.

8. The high-reliability active-passive integrated protection device according to claim 7, characterized in that, The first switching device consists of two conductive connectors. The two ends of the conductive connectors are electrically connected to the external trigger signal circuit and the signal receiving end of the first excitation device, respectively, through wires. When the first molten metal melts, the arc energy generated drives the transmission device to operate. After the transmission device disconnects the conductive connectors, it drives the conductive connector part that is electrically connected to the first excitation device to be electrically connected to the first trigger circuit.

9. The high-reliability active-passive integrated protection device according to claim 7, characterized in that, The first melt is connected in parallel with the second melt; the transmission device includes a spring and a piston structure; the second melt binds the spring in a compressed state; when the first melt melts and the second melt melts, the piston structure moves under the action of elastic force, driving the first trigger circuit to be electrically connected to the signal receiving end of the first excitation device to provide a trigger signal for the first excitation device.

10. The high-reliability active-passive integrated protection device according to any one of claims 7 or 9, characterized in that, The first or second melt is located in the cavity, and the transmission device closes the cavity.

11. The high-reliability active-passive integrated protection device according to claim 10, characterized in that, The transmission device is a flexible membrane that encloses the first melt or the second melt; or the transmission device is a piston structure.

12. The high-reliability active-passive integrated protection device according to claim 10, characterized in that, The cavity containing the first or second melt is filled with an arc-extinguishing medium.

13. The high-reliability active-passive integrated protection device according to any one of claims 1 to 5, 7 to 9, and 11 to 12, characterized in that, The first triggering circuit includes a transformer, wherein the high-voltage end circuit of the transformer is connected in parallel with the first fuse, and the low-voltage end circuit of the transformer is not connected to the first excitation device. When the first melt is working normally, the low-voltage circuit of the transformer is not connected to the first excitation device; When the first molten element melts, the arc energy generated by the melting of the first molten element can drive the low-voltage end circuit of the transformer to be electrically connected to the signal receiving end of the first excitation device, and the first trigger circuit sends a trigger signal to the first excitation device.

14. The high-reliability active-passive integrated protection device according to claim 13, characterized in that, A continuity detection device for controlling the on / off state of the control circuit is connected in series in the high-voltage end circuit of the transformer.

15. The high-reliability active-passive integrated protection device according to claim 14, characterized in that, The continuity detection device can be an active or passive device.

Images