An emergency protection device and method for a circuit

Abstract

The present invention belongs to the technical field of emergency protection devices, in particular to an emergency protection device for a circuit and a method thereof. The device includes a wiring base, a normally closed single-pole double-throw relay detachably arranged on the front end face of the wiring base, and a surge protection module arranged at the lower part of the front end face of the wiring base; an installation groove is arranged on the front end face of the wiring base, and the surge protection module is detachably arranged in the installation groove; the device further includes a separation module arranged in the installation groove, which is used to trigger when the surge protection module breaks down and shorts, and realize the separation operation of the surge protection module from the installation groove; during the actual working process, the surge protection module can release the overloaded or surge voltage to protect the load. If a continuous fault overvoltage causes the surge protection module to break down and short, and then causes the temperature to continuously rise and lead to a fire, the separation module can perform a separation operation to separate the surge protection module from the installation groove to achieve forced disconnection.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency protection devices, and particularly to a circuit emergency protection device and a method thereof. Background Art

[0002] With the rapid development of the national economy and modern science and technology, various electronic devices and large-scale integrated circuits are widely used in modern buildings. Due to their low operating voltage and limited overvoltage tolerance, the probability of being damaged and interfered by surge overvoltage attacks increases significantly. Therefore, in these circuits, circuit emergency protection devices need to be installed at the front end of the load. For this requirement, surge protective devices (SPDs) used to limit transient overvoltage and divert surge current are widely used in various occasions such as power systems, antenna feed systems, and communication systems to reduce the adverse effects brought by fault overvoltage and achieve the purpose of emergency protection.

[0003] However, in the actual use process, when the core component metal oxide varistor MOV of the surge protector encounters a relatively high continuous fault overvoltage, it will generate continuous high temperature. If the circuit cannot be cut off in time at this time, the MOV will melt and break down, and even arc, causing the MOV or the SPD encapsulation material to catch fire, often resulting in certain economic losses and adverse effects.

[0004] Therefore, in view of the above technical problems, the present solution specifically proposes a new circuit emergency protection device and a method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a circuit emergency protection device to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A circuit emergency protection device and a method thereof, the device includes a wiring base and a normally closed single-pole double-throw relay detachably arranged on the front end face of the wiring base;

[0007] It further includes a surge protection module arranged at the lower part of the front end face of the wiring base, an installation groove is provided on the front end face of the wiring base, and the surge protection module is detachably arranged in the installation groove;

[0008] It further includes a separation module arranged in the installation groove, which is triggered when the surge protection module breaks down and shorts, and realizes the separation operation of the surge protection module from the installation groove.

[0009] For the circuit emergency protection device of the present invention, the normally closed single-pole double-throw relay includes a housing and a relay body disposed within the housing; on the side wall of the housing, a normally closed contact terminal and a normally open contact terminal are respectively provided corresponding to the armature moving head of the relay body, and the outer end pins of the normally closed contact terminal and the normally open contact terminal are respectively inserted into two first connection ports on the connection base.

[0010] For the circuit emergency protection device of the present invention, insulating oil for submerging the contact points of the armature moving head is provided within the housing.

[0011] For the circuit emergency protection device of the present invention, the surge protection module includes a high-voltage conduction element, and on the bottom surface of the installation groove, there are socket joints adapted to the input pin and the output pin of the high-voltage conduction element; the output pin includes a grounding branch pin and a triggering branch pin; a potential elevation resistor is connected in series to the grounding end of the grounding branch pin, and a voltage-limiting resistor is connected in series to the triggering branch pin and is connected to the coil connection head of the normally closed single-pole double-throw relay.

[0012] For the circuit emergency protection device of the present invention, both the high-voltage conduction element and the voltage-limiting resistor are varistors, the potential elevation resistor is a gas discharge tube, the conduction resistance value of the potential elevation resistor is greater than the resistance value of the voltage-limiting resistor, and the voltage-limiting resistor has two conduction states with gradually increasing conduction voltages.

[0013] For the circuit emergency protection device of the present invention, the separation module includes a piston body that seals the installation groove and can slide back and forth. An accommodation groove for accommodating the protective cover is provided inside the piston body, and both the output pin and the input pin penetrate through the piston body; on the lower side wall of the housing, there is a quick connector communicating towards the connection base, and on the front side wall of the connection base, there is a mating port for the quick connector to be inserted. The mating port is communicated with the installation groove through a connection channel, and the outlet of the connection channel is located at the rear side of the piston body.

[0014] For the circuit emergency protection device of the present invention, the separation module further includes a discharge needle opposite to the socket joint connected to the grounding branch pin up and down, and an insulating stop member located between the normally open contact terminal and the normally closed contact terminal; when the voltage-limiting resistor is in the first-stage conduction state, the armature moving head leaves the normally closed contact terminal and abuts against the insulating stop member; when the voltage-limiting resistor is in the second-stage conduction state, the armature moving head disengages from the insulating stop member and conducts with the normally open contact terminal.

[0015] For the circuit emergency protection device described in the present invention, the first-stage conduction state is triggered by the surge voltage on the high-voltage conduction element, and the second-stage conduction state is triggered by the continuous surge voltage or fault overload voltage on the high-voltage conduction element.

[0016] For the circuit emergency protection device described in the present invention, when the piston body slides forward to the in-place position, the liquid level of the insulating oil behind the piston body is located below the discharge point of the discharge needle and the corresponding plug connector.

[0017] For the circuit emergency protection device described in the present invention, the insulating stopper is of a cylindrical structure and is horizontally embedded on the side wall of the housing facing the wiring base. An adjusting bolt for adjusting the forward or backward movement of the insulating stopper is provided on the side wall of the housing facing the wiring base.

[0018] In addition, the present invention also provides a method for implementing a circuit emergency protection device. According to the above-mentioned circuit emergency protection device, the method for implementing the circuit emergency protection device includes the following steps:

[0019] If a surge voltage or overload voltage appears on the phase line, the surge protection module is used to release the surge voltage by pressure relief;

[0020] If a continuous fault overload voltage appears on the phase line, resulting in continuous temperature rise of the surge protection module and then thermal melting and breakdown short circuit, the separation module is used to perform a separation operation to separate the surge protection module from the installation slot, so as to achieve forced disconnection of the surge protection module from the circuit.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: During the actual working process, if a surge voltage or overload voltage appears on the phase line, the surge protection module is used to release the surge voltage by pressure relief to protect the load. If a continuous fault overload voltage appears on the phase line, resulting in continuous temperature rise of the surge protection module and then thermal melting and breakdown short circuit, in order to avoid continuous temperature rise causing the encapsulation material and the base to catch fire, at this time, the separation module can be used to perform a separation operation to separate the surge protection module from the installation slot, so as to achieve forced disconnection of the surge protection module from the circuit, and thus remove the fire risk point. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 This is the overall structure diagram of the present invention.

[0024] Figure 2 This is the side view of the present invention.

[0025] Figure 3 This is Figure 2 the A-A cross-sectional view of

[0026] Figure 4 This is Figure 3 the enlarged view of the local structure in

[0027] Figure 5 This is Figure 3 the enlarged view of the local structure in

[0028] Figure 6 This is the internal structure diagram of the high-voltage conduction element of the present invention.

[0029] Figure 7 This is the circuit schematic diagram of the present invention. Specific embodiments

[0030] In the description and claims of the present invention and the above-mentioned drawings, the terms "first", "second", "third", "fourth", etc. are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0031] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] "Plurality" means two or more. "And / or" describes the associated relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0033] Moreover, the orientation terms such as "upper, lower, left, right, upper end, lower end, longitudinal" are all referenced based on the attitude position of the device or equipment described in this solution during normal use.

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0035] This embodiment discloses a circuit emergency protection device as Figures 1 to 7 shown. The device includes a wiring base 10 and a normally closed single-pole double-throw relay 20 detachably disposed on the front end face of the wiring base 10. Among them, the wiring base 10 is in a cuboid shape and its material is flame-retardant ABS that meets the regulations. Further, a pair of wiring terminals 300 are provided on the upper part of the front side wall, the top end face and the lower end face of the wiring base 10 for connecting the external power grid phase lines of each pin. Further, in order to facilitate the setting of the internal connecting wires of the pins of the normally closed single-pole double-throw relay 20 and the corresponding wiring terminals. A boss portion 101 is integrally provided on the front side wall of the wiring base 10. A pair of wiring terminals on the front side wall of the wiring base 10 are located in the upper part of the front side wall of the boss portion 101, and the normally closed single-pole double-throw relay 20 is installed in the middle of the front side wall of the boss portion 101. The normally closed single-pole double-throw relay 20 is inserted into the first wiring port 102 on the boss portion 101 through its pins, thereby achieving the purpose of quick disassembly and quick replacement. And in order to further ensure stability, a U-shaped wire rack 200 is also provided on the boss portion 101 to tighten and press the relay against the boss portion 101.

[0036] Further, the device also includes a surge protection module 30 disposed at the lower part of the front end face of the wiring base 10. Specifically, the surge protection module 30 is located at the lower part of the front side wall of the boss portion 101 and below the normally closed single-pole double-throw relay 20. Further, an installation groove 1011 is provided on the front end face of the wiring base 10, specifically on the front side wall of the boss portion 101. The surge protection module 30 is installed in the installation groove 1011 in a separable manner to facilitate replacement and separation from the wiring base 10 in case of spontaneous combustion. Among them, both the surge protection module 30 and the installation groove 1011 are in a cuboid structure.

[0037] Furthermore, the device further includes a separation module 40 disposed in the installation groove 1011. The separation module 40 is configured to be triggered when the surge protection module 30 is broken down and short-circuited due to continuous fault overload voltage, and to perform the separation operation of the surge protection module 30 from the installation groove 1011. When a continuous overload high voltage appears in the circuit phase line (live wire), the temperature of the surge protection module 30 will continue to rise. If effective measures are not taken in time, it will lead to subsequent fire risks. However, the separation module of this device can just remove the surge protection module from the installation groove 1011 according to the working temperature of the surge protection module, thus avoiding fire risks.

[0038] During the actual working process, if a surge voltage or an overload voltage appears on the phase line, the surge protection module 30 is used to relieve and release the surge voltage or the overload voltage to protect the load. If a continuous fault overload voltage appears on the phase line, causing the temperature of the surge protection module 30 to continuously rise and then melt through and short-circuit, in order to avoid the continuous temperature rise from causing the encapsulation material and the base to catch fire, at this time, the separation module 40 can perform the separation operation to separate the surge protection module 30 from the installation groove 1011, so as to forcibly disconnect the connection between the surge protection module 30 and the circuit, and then remove the heat source, thereby avoiding the continuous temperature rise of the wiring base 10 and finally causing an open fire and fire.

[0039] In this embodiment, the normally closed single-pole double-throw relay 20 includes a square housing 21 and a relay body 22 disposed in the housing 21. Among them, the housing 21 includes a bottom plate 211 for fixing the relay body 22, and a sealing cover 212 for sealing and covering the relay body 22 on the bottom plate 211. A normally closed contact terminal 222 and a normally open contact terminal 223 are specifically provided on the side wall of the housing 21 corresponding to the armature moving head 221 of the relay body 22 on the bottom plate 211. The outer end pins of the normally closed contact terminal 222 and the normally open contact terminal 223 are respectively inserted into two first wiring ports 102 specifically located on the front side wall of the boss portion 101 of the wiring base 10. The two wiring pins 2241 of the coil 224 of the relay body 22 are respectively inserted into the other two first wiring ports 102. The access wire pin 2210 of the armature moving head 221 of the relay body 22 is inserted into another first wiring port 102.

[0040] In addition, in order to ensure more reasonable wiring inside the wiring base 10, the two pins of the coil 224 of the relay body 22 are arranged side by side left and right. The normally open contact terminal 223 and the normally closed contact terminal 222 are arranged side by side up and down and are both located below the two pins of the coil 224, while the access wire pin 2210 of the armature moving head 221 is located above the pins of the coil 224.

[0041] In this embodiment, the housing 21 is provided with insulating oil that submerges the contact points of the armature moving head 221, specifically submerging the contact points on the upper side of the armature moving head 221, so as to avoid arcing during the process of switching contacts. Among them, the insulating oil is preferably mineral insulating oil, and of course, other common synthetic insulating oils can also be used.

[0042] In this embodiment, the surge protection module 30 includes a high-voltage conduction element 31 and a protective outer cover 32 that is encapsulated outside the high-voltage conduction element 31 and has a cuboid structure. The protective outer cover 32 is adapted to the internal circumferential contour of the installation groove 1011. Specifically, on the bottom surface of the installation groove 1011, there is a socket 50 that is adapted to the input pin 311 and the output pin 312 of the high-voltage conduction element 31. The socket 50 is composed of two relatively fitting metal sheets. Generally, an expansion port is provided at the insertion end of the socket 50. Similarly, the first wiring port 102 has the same structural composition. This structure is a common component in the industry and will not be elaborated here.

[0043] Further, the output pin 312 of the high-voltage conduction element 31 includes a ground branch pin 3121 and a trigger branch pin 3122. A potential elevation resistor 60 is connected in series at the ground end of the ground branch pin 3121. After a voltage-limiting resistor 70 is connected in series on the trigger branch pin 3122, it is connected to the coil 224 access head of the normally closed single-pole double-throw relay 20. Specifically, the connection is realized through the first wiring port 102 that is inserted and cooperated with the pin 2210 of the access wire of the armature moving head 221. When the relay is inserted in place, its coil is connected to the high-voltage conduction element 31 through the trigger branch pin. Among them, the voltage-limiting resistor 70 and the potential elevation resistor 60 are both encapsulated inside the protective outer cover 32. The ends of the ground branch pin 3121 and the trigger branch pin 3122 extend out of the protective outer cover 32 and can be connected to the socket. During the working process, if a surge voltage appears on the phase line, at this time, the high-voltage conduction element 31 is triggered and conducted by the surge voltage. At this time, through the cooperation of the voltage-limiting resistor 70 and the potential elevation resistor 60, it can be ensured that the coil 224 is energized and normally triggered without being burned out, thereby enabling the iron core to be magnetized and attracting the armature moving head 221 to move away from the normally closed contact terminal 222, thereby cutting off the input of the load and ensuring that the load is not burned out by the surge voltage.

[0044] In this embodiment, both the high-voltage conduction element 31 and the voltage-limiting resistor 70 are varistors, and the potential elevation resistor 60 is a gas discharge tube. The conduction resistance value of the potential elevation resistor 60 is greater than the resistance value of the voltage-limiting resistor 70, so that the voltage-limiting resistor 70 can normally divide the voltage to trigger the coil 224.

[0045] The potential elevation resistor 60 uses a discharge tube, and the characteristics generated by its series connection with the high-voltage conduction element 31 can make the circuit have the following many advantages:

[0046] 1. When used in series, they have complementary overvoltage protection characteristics: The varistor and the gas discharge tube have different overvoltage protection characteristics and response times. The varistor can respond quickly when the voltage is too high, providing a large resistance to absorb the overvoltage current; while the gas discharge tube can provide a higher discharge capacity when overvoltage occurs, diverting the overvoltage current to the ground. Their overvoltage protection characteristics are complementary, and can provide more comprehensive protection in different situations.

[0047] 2. Using them in series can also reduce the output residual voltage: When the varistor and the gas discharge tube are used in series, due to their synergistic effect, the output residual voltage can be greatly reduced. This is particularly important for protecting sensitive components in the circuit and can effectively prevent device damage caused by overvoltage.

[0048] 3. Using them in series can also improve the current-carrying capacity: The gas discharge tube has a high current-carrying capacity. When a large current appears in the circuit, the gas discharge tube can conduct in time and divert the current to the ground. After being connected in series with the varistor, the current-carrying capacity of the circuit can be further improved to ensure the stable operation of the circuit in extreme cases.

[0049] 4. Extend the service life: Since the varistor absorbs a large current in the circuit for a long time, it is easy to cause performance attenuation and aging. After being connected in series with the gas discharge tube, the gas discharge tube can isolate the varistor from the system under normal working conditions, reducing the voltage and leakage current flowing through the varistor, thereby effectively slowing down the performance degradation of the varistor and extending its service life.

[0050] In addition, in this embodiment, the voltage-limiting resistor 70 has two conduction states with sequentially increasing conduction voltages, that is, when a surge appears at the front end of the high-voltage conduction element 31 and causes it to be excited and conduct, the circuit state in this state makes the voltage-limiting resistor 70 divide the voltage and be in the first conduction state. In this state, the voltage-limiting resistor 70 obtains a lower voltage and current, and the coil 224 can magnetize the iron core to a limited extent in this state, so that the armature moving head 221 can be normally adsorbed and separated from the normally closed contact terminal 222; and when a persistent fault high voltage appears in the phase line, the high-voltage conduction element 31 will be in the conduction state for a long time during the fault voltage time. Since the varistor generates a lot of heat during this period (at this time, the cooling effect of the insulating oil and the self-heat dissipation rate of the chip MOV can no longer balance the generated heat), the chip will be burned through and short-circuited after a certain time. At this time, the isolation resistance of the circuit drops suddenly, resulting in a sudden increase in the voltage at the front end of the voltage-limiting resistor 70 and thus making it enter the second conduction state.

[0051] Among them, if the overvoltage duration of the high-voltage conduction element 31 is relatively long, the internal chip MOV continues to conduct and heat accumulates. At this time, the heat generation rate P = I 2 R and the heat dissipation rate P cool=k(T - T0) competition (where k is the heat dissipation coefficient and T0 is the ambient temperature). It can be seen that if the heat generation rate exceeds the heat dissipation, the temperature will rise exponentially. When the temperature exceeds the material limit (usually 150 - 200 °C), the grain boundary structure of zinc oxide undergoes irreversible damage, resulting in an increase in leakage current or short circuit, which may cause MOV cracking, combustion or explosion. If the short-circuit temperature continues to rise, generally exceeding 750 ° (under the dual action of the heat generation temperature of MOV and the overloaded high voltage), the wiring base 10 will also burn. For this situation, this embodiment can solve the problem in the following way, that is, by setting the separation module 40 to include a sealed installation groove 1011 and a piston body 41 that can slide back and forth. An accommodation groove 410 for accommodating the protective outer cover 32 is provided inside the piston body 41, and both the output pin 312 and the input pin 311 penetrate the piston body 41; a quick connector 80 is communicated with the lower side wall of the outer shell 21 and faces the wiring base 10. A docking port 90 for the quick connector 80 to be inserted is provided on the front side wall of the wiring base 10. The docking port 90 is communicated with the installation groove 1011 through a connection channel 100, and the outlet of the connection channel 100 is located at the rear side of the piston body 41.

[0052] Among them, the quick connector 80 is specifically composed of a hollow tube 81, a movable head 82 located inside it, and a return spring 83. Specifically, the movable head 82 is a T-shaped part, and its horizontal end is a disc plug 821 for sealing the hollow tube 81. One end of the hollow tube 81 is inserted into the bottom plate 211 of the outer shell 21 and is communicated with the inside of the sealing cover 212 through a flow channel 110 and can export the insulating oil inside it. Under the action of the return spring 83, the larger-diameter end of the movable head 82 keeps the hollow tube 81 sealed initially. When the end of the movable head 82 is inserted into the docking port 90, by providing a butting member 120 in the docking port 90 for the longitudinal end of the movable head 82 to abut against, the disc plug 821 of the movable head 82 is opened after docking in place, so that the inside of the relay is communicated with the chamber at the rear side of the piston body 41, enabling the insulating oil inside the relay to be sucked into the installation groove 1011 by pushing the piston body 41 forward before use; of course, the quick connector 80 can also be designed as a simpler soft rubber sealing film structure. By providing a needle in the docking port 90 for piercing the soft rubber sealing film, this method can also achieve the purpose of introducing the insulating oil inside the power saver into the installation groove 1011 when the power saver is installed in place. Further, a certain amount of insulating oil can be pre-injected at the bottom of the installation groove 1011 alone to meet the requirements of cooling the chip MOV and preventing arcs caused by poor contact between pins.

[0053] Further, the separation module 40 is further provided with a discharge needle 42 opposite to the plug connector connected to the grounding branch pin 3121, and an insulating stopper 130 located between the normally open contact terminal 223 and the normally closed contact terminal 222; when the voltage-limiting resistor 70 is in the first-stage conduction state, the armature moving head 221 leaves the normally closed contact terminal 222 and abuts against the insulating stopper 130, and when the voltage-limiting resistor 70 is in the second-stage conduction state, the coil 224 is further energized in this state, so that the iron core is further magnetized and its magnetic attraction becomes larger. At this time, the suction force received by the armature moving head 221 is increased compared with before, and then the armature moving head 221 is caused to disengage from the insulating stopper 130 and come into contact with the normally open contact terminal 223 to conduct; further, when the piston body 41 slides forward to the in-place position, the liquid level of the insulating oil located behind the piston body 41 is below the discharge point of the discharge needle 42 and the corresponding plug connector. At this time, due to the decomposition of the insulating oil behind the piston body 41 under the action of high temperature for a long time, combustible gases generated during the whole process are accumulated in the chamber behind the piston body 41 (mineral insulating oil mainly generates hydrogen and methane under low-temperature (<300°C) thermal faults, while it mainly generates methane and ethylene under medium- and high-temperature (≥300°C) thermal faults. In addition, a small amount of carbon dioxide (CO2) and carbon monoxide (CO) and other gases are also generated). When the discharge needle 42 instantaneously conducts and discharges, the combustible gas will be ignited, causing the pressure behind the piston body 41 to suddenly increase and then push it out of the installation groove 1011. At this time, the short-circuited and burned high-voltage conduction element 31 can be forcibly separated from the circuit system, thus avoiding the continuous development of the fire source; further, gas or liquid or solid that can be detonated by the discharge arc of the discharge needle can also be pre-installed in the chamber behind the piston body, but compared with the method of using insulating oil to thermally precipitate combustible gases, the heat absorption effect on the high-voltage conduction element cannot be taken into account.

[0054] In addition, in order to ensure that the protective cover 32 can still be smoothly pushed out of the installation groove 1011 when the MOV chip inside it is burned out, a barrel structure 140 made of a heat-conducting metal material can be added in the installation groove 1011 to cooperate with the normal forward and backward movement of the piston body 41. Among them, the insulation conditions of the discharge needle 42, the plug connector and the barrel structure 140 need to be taken into account. Moreover, a cover 150 covering the front end of the barrel structure 140 can be provided on the front side wall of the convex platform portion 101 for protection purposes, but this setting method needs to consider the situation of the piston body 41 popping out, and ensure that it does not affect the smooth popping out of the piston body 41 as a precondition.

[0055] In this embodiment, the insulating stopper 130 has a cylindrical structure and is horizontally embedded in the side wall of the housing 21 facing the wiring base 10. An adjusting bolt 160 for adjusting the forward or backward movement of the insulating stopper 130 is provided on the side wall of the housing 21 facing the wiring base 10. By means of the adjusting bolt 160, the overlapping degree between the insulating stopper 130 and the armature moving head 221 can be shortened backward. When the insulating stopper 130 is shortened backward to a certain extent, the armature moving head 221 will reset and contact the normally closed contact terminal 222 again. After reaching the position, the insulating stopper 130 can be reset here to prepare for the next operation of the relay.

[0056] Further, the implementation method of the circuit emergency protection device of the present invention includes the following steps:

[0057] If a surge voltage or an overvoltage appears on the phase line, the surge protection module releases the surge voltage by pressure relief;

[0058] If a continuous fault overvoltage on the phase line causes the temperature of the surge protection module to continuously rise and then melt through and short-circuit, the separation module performs a separation operation to separate the surge protection module from the installation groove, so as to forcibly disconnect the connection between the surge protection module and the circuit and forcibly remove the fire risk point.

[0059] It should be understood that those of ordinary skill in the art can make improvements or changes according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

1. A circuit emergency protection device, characterized in that, It includes a wiring base and a normally closed single-pole double-throw relay detachably provided on the front end face of the wiring base; It further includes a surge protection module provided at the lower part of the front end face of the wiring base. An installation groove is provided on the front end face of the wiring base, and the surge protection module is detachably provided in the installation groove; It further includes a separation module provided in the installation groove, which is triggered when the surge protection module breaks down and shorts, and realizes the separation operation of the surge protection module from the installation groove; The normally closed single-pole double-throw relay includes a housing and a relay body provided in the housing; a normally closed contact terminal and a normally open contact terminal are provided on the side wall of the housing corresponding to the armature moving head of the relay body. The outer end pins of the normally closed contact terminal and the normally open contact terminal are respectively inserted into two first wiring ports on the wiring base, and insulating oil for submerging the contact point of the armature moving head is provided in the housing; The surge protection module includes a high-voltage conduction element. Plug connectors adapted to the input pins and output pins of the high-voltage conduction element are provided on the bottom surface of the installation groove; the output pins include a grounding branch pin and a trigger branch pin; a potential elevation resistor is connected in series at the grounding end of the grounding branch pin, and a voltage-limiting resistor is connected in series on the trigger branch pin and is connected to the coil access head of the normally closed single-pole double-throw relay; Both the high-voltage conduction element and the voltage-limiting resistor are varistors, the potential elevation resistor is a gas discharge tube, the conduction resistance value of the potential elevation resistor is greater than the resistance value of the voltage-limiting resistor, and the voltage-limiting resistor has two conduction states with sequentially increasing conduction voltages; The separation module includes a piston body that seals the installation groove and can slide back and forth. A receiving groove for receiving the protective outer cover of the high-voltage conduction element is provided inside the piston body. Both the output pin and the input pin penetrate through the piston body; a quick connector facing the wiring base is communicated and provided on the lower side wall of the housing, and a docking port for inserting the quick connector is provided on the front side wall of the wiring base corresponding to the quick connector. The docking port is communicated with the installation groove through a connection channel, and the outlet of the connection channel is located behind the piston body; The separation module further includes a discharge needle opposite to the plug connector connected to the grounding branch pin, and an insulating stop member located between the normally open contact terminal and the normally closed contact terminal; when the voltage-limiting resistor is in the first-stage conduction state, the armature moving head leaves the normally closed contact terminal and abuts against the insulating stop member; when the voltage-limiting resistor is in the second-stage conduction state, the armature moving head disengages from the insulating stop member and conducts with the normally open contact terminal.

2. The circuit emergency protection device according to claim 1, wherein, The first-stage conduction state is triggered by the surge voltage on the high-voltage conduction element, and the second-stage conduction state is triggered by the continuous surge voltage or fault overload voltage on the high-voltage conduction element.

3. The circuit emergency protection device according to claim 1, wherein, When the piston body slides forward in place, the liquid level of the insulating oil located behind the piston body is below the discharge point of the discharge needle and the corresponding plug connector.

4. The circuit emergency protection device according to claim 1, characterized in that, The insulating stopper is of a cylindrical structure and is horizontally embedded in the side wall of the housing facing the wiring base. An adjusting bolt for adjusting the forward or backward movement of the insulating stopper is provided on the side wall of the housing facing the wiring base.

5. A method for implementing a circuit emergency protection device, according to the circuit emergency protection device described in any one of claims 1-4, characterized in that, The implementation method of the circuit emergency protection device includes the following steps: If a surge voltage or an overvoltage appears on the phase line, the surge protection module releases the surge voltage by pressure relief. If a continuous fault overvoltage appears on the phase line, resulting in a continuous increase in the temperature of the surge protection module and then thermal melting and breakdown short circuit, the separation module performs a separation operation to separate the surge protection module from the installation groove, so as to achieve the forced disconnection of the surge protection module from the circuit.

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