Integrated backup protection power supply lightning arrester

Abstract

The invention discloses an integrated backup protection power supply lightning arrester, wherein the backup protection power supply input end is respectively connected to one end of an inductance vector module and one end of a high short-circuit setting value overcurrent fuse, the other end of the inductance vector module is connected to one end of a low short-circuit setting value overcurrent fuse, both ends of the low short-circuit setting value overcurrent fuse are connected in parallel with a high-frequency capacitor having a capacitive filtering function, one side of the low short-circuit setting value overcurrent fuse is provided with a remote signal switch acting simultaneously therewith, the other end of the high short-circuit setting value overcurrent fuse is connected to one end of a discharge type switch tube, the other end of the low short-circuit setting value overcurrent fuse and the other end of the discharge type switch tube are respectively connected to one end of a surge protector, and the other end of the surge protector is connected to a ground terminal. The invention overcomes the disadvantage of poor surge impact resistance of the fuse, integrates a fuse target backup protection technology module with dual overcurrent protection setting values ​​and a fuse blow indication, and realizes an integrated SPD product.

Description

Technical Field

[0001] The invention relates to an integrated backup protection power supply lightning arrester, belonging to the technical field of lightning protection equipment. Background Art

[0002] A power lightning arrester is a low-voltage electrical appliance used in low-voltage power distribution systems with a voltage of less than 1000 volts to limit instantaneous overvoltage and discharge surge current. It is also called a surge protector (SPD) and is widely used in power supply equipment for power supply and distribution in various industries of the national economy. It is connected across the power supply phases or to the ground according to different design requirements; and when a surge overvoltage occurs in the middle of the power grid, it discharges the lightning surge current, limits the voltage protection level to below the insulation withstand voltage level of the power system, improves the power supply quality, and protects the safe operation of electrical equipment.

[0003] Because power lightning arresters, especially voltage-limiting surge protectors made of zinc oxide (MOV), are prone to cracking, melting, and perforation when subjected to surge impacts under severe transient overvoltage TOV or degradation of the power grid, the power frequency leakage current passing through the SPD increases sharply, resulting in continuous power frequency overcurrent and fault heating of the SPD. According to statistics and experimental demonstrations: when the SPD continuously passes 3 ampere power frequency current for only a few seconds, it is enough to cause the SPD to burn, and in severe cases, it will cause secondary accidents such as explosion of the lightning arrester, short circuit tripping, and burning of electrical equipment. Serious economic losses are caused. The occurrence of transient overvoltage TOV in the power grid and the degradation process of the SPD are random and unpredictable. In this way, there will inevitably be safety hazards in the operation of power lightning arresters in low-voltage distribution systems, which must be eliminated.

[0004] In order to prevent such accidents from happening, and to ensure the safe and reliable operation of low-voltage distribution systems in the implementation of lightning protection, the IEC 61643-12 and IEC60364-5-534 standards recommend the use of overcurrent protection disconnectors (such as circuit breakers and fuses) in series with SPDs as backup overcurrent protection devices for SPDs, so that when a short-circuit fault occurs in the SPD, it can be disconnected from the distribution system in a timely manner to avoid accidents. In IEC 61643.12-2008 "Low-voltage surge protectors Part 12: Surge protectors for low-voltage distribution systems - Selection and use principles", Appendix P "Short-circuit backup protection and surge tolerance" gives suggestions on the coordination of fuses and SPDs based on i2t calculation. Now the application of new technology of target backup protection for power supply lightning arresters has also supplemented and solved the problem of SPD backup protection coordination with dual divergent overcurrent protection indicators, and the application of new technology of target current monitoring shunt protection has realized a complete and reliable backup protection for power supply lightning arresters. The backup protection technology of the lightning arrester with target overcurrent protection of the all-round protection function has the disadvantage that the fuse has poor surge impact resistance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem that the fuse has poor surge impact resistance.

[0006] In order to solve the above technical problems, the technical solution of the present invention is to provide an integrated backup protection power supply lightning arrester, characterized in that its circuit structure includes a backup protection power supply input end, the backup protection power supply input end is respectively connected to one end of an inductance vector module and one end of a high short-circuit setting value overcurrent fuse, the other end of the inductance vector module is connected to one end of a low short-circuit setting value overcurrent fuse, both ends of the low short-circuit setting value overcurrent fuse are connected in parallel with a high-frequency capacitor with a capacitive filtering function, one side of the low short-circuit setting value overcurrent fuse is provided with a remote signal switch that acts simultaneously with it, the other end of the high short-circuit setting value overcurrent fuse is connected to one end of a discharge type switch tube, the other end of the low short-circuit setting value overcurrent fuse and the other end of the discharge type switch tube are respectively connected to one end of a surge protector, and the other end of the surge protector is connected to the ground terminal.

[0007] Preferably, the low short-circuit setting value overcurrent fuse is a low setting ampere-level fuse; and the high short-circuit setting value overcurrent fuse is a high setting ampere-level lightning current fuse.

[0008] Preferably, the other end of the low short-circuit setting value overcurrent fuse is connected to the PI end of the surge protector; one end of the discharge type switch tube is connected to the PI end of the surge protector; and the PII end of the surge protector is connected to the ground end.

[0009] Preferably, the ground terminal is connected to the power supply N terminal or the safety ground PE terminal.

[0010] Preferably, the low short-circuit setting value overcurrent fuse comprises a fuse tube body, a conductive top cap is provided on the top of the fuse tube body, a conductive bottom cap is provided on the bottom of the fuse tube body, an energy storage spring is fixed at the middle position inside the fuse tube body, a fuse indication jumper that can move up and down is provided on the energy storage spring, the fuse indication jumper is arranged in the fuse tube body, the upper part of the fuse indication jumper is fixed on the conductive top cap, the bottom of the fuse indication jumper is connected to one end of the fuse, and the other end of the fuse passes through the energy storage spring and is connected to the conductive bottom cap.

[0011] Preferably, the fuse tube body is filled with arc-extinguishing quartz sand, and the arc-extinguishing quartz sand is arranged below the energy storage spring.

[0012] Preferably, the high short-circuit setting value overcurrent fuse comprises a sleeve, and an upper cover and a lower cover are respectively provided at both ends of the sleeve, the upper cover and the lower cover are connected by a multi-strand cross-section alloy fuse, and the sleeve is sleeved on the outside of the multi-strand cross-section alloy fuse.

[0013] Preferably, the sleeve is filled with arc-extinguishing quartz sand.

[0014] The integrated backup protection power supply lightning arrester is characterized in that its hardware structure includes a backup protection power supply input terminal, which is connected to the discharge type switch tube through the first copper bar, and then connected to the high short-circuit setting value overcurrent fuse below through the second copper bar, and then connected to the PI terminal on the surge protector through the third copper bar; the other way of the backup protection power supply input terminal is connected to the low short-circuit setting value overcurrent fuse through a connecting line, and then connected to the inductance vector module, the inductance vector module is connected in parallel with the high-frequency capacitor, and then connected to the PI terminal on the surge protector through the third copper bar; and then output from the PII terminal of the surge protector, connected to the ground terminal through the copper bar; a remote signal switch is provided on one side of the low short-circuit setting value overcurrent fuse, the remote signal switch is connected to the remote signal control conversion circuit board, and the remote signal control conversion circuit board is connected to the remote signal output port.

[0015] The present invention overcomes the disadvantage of poor surge impact resistance of fuses, integrates a fuse target backup protection technology module with dual overcurrent protection setting values ​​and a fuse blown indication, and combines it with a lightning surge protector to form an independent lightning protection device with perfect backup protection, thereby realizing an integrated SPD product.

[0016] The present invention does not need to be equipped with an external SPD backup protection device, and effectively solves the SPD backup protection coordination problem of the dual divergent current protection index, and meets the basic function and backup protection requirements of the surge protector (SPD) in the lightning surge protection application standards of IEC 61643-12, IEC6034-5-534 and GB-50057-942000, etc.; and realizes a new product of a power supply lightning surge protector with full surge protection function that meets the standards, is perfect, and has a safe backup protection disconnector function.

[0017] The present invention retains the electrical structure mode of conventional lightning arrester applications, and is composed of a lightning arrester base with a fuse device group using target parameter control technology and a full C-class series MOV module. It is convenient to plug and unplug and change the MOV module, and can synthesize an integrated surge protector with fuse backup protection of various specifications and levels from C10 to C60.

[0018] The present invention has a compact structure and is easy to install. It can directly replace various types of SPDs without backup protection devices, omitting the configuration of external backup protection disconnectors, and can conveniently integrate 1P, 3P, 4P, 3P+1P and other C-class surge lightning protector groups as needed. It can be successfully applied in various lightning protection occasions of low-voltage power systems.

[0019] Since the lightning arrester of the present invention has no external backup protection disconnector, a large number of cable connections at the phase-to-phase device ports are omitted, which not only saves a large amount of installation space and installation cost, but also the short and convenient connection greatly reduces the electrical resistance, so that the residual voltage during surge and large current impact is reduced to an extremely low level, effectively reducing the voltage protection level and improving the safe operation index of the power supply system.

[0020] The invention has built-in MOV degradation failure alarm and fuse blown alarm dual remote signaling switches and on-site fault indication, and has the function of remote fault monitoring and remote signaling.

[0021] The detachable structure of the fuse module of the present invention can make on-site processing safer, component replacement more convenient, and operation recovery faster after a fault occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the circuit schematic diagram of the integrated backup protection power supply lightning arrester;

[0023] Figure 2 is the equivalent schematic diagram of the inductor vector module;

[0024] Figure 3a It is a structural schematic diagram of a low short-circuit setting value overcurrent fuse;

[0025] Figure 3b This is the original state diagram of the low short-circuit setting value overcurrent fuse;

[0026] Figure 3c It is the fusing state diagram of the low short-circuit setting value overcurrent fuse;

[0027] Figure 4a It is a structural schematic diagram of an overcurrent fuse with a high short-circuit setting value;

[0028] Figure 4b for Figure 4a Schematic diagram of the internal structure;

[0029] Figure 5 This is a structural diagram of the integrated backup protection power supply lightning arrester. DETAILED DESCRIPTION

[0030] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0031] The present invention is an integrated backup protection power supply lightning arrester, such as Figure 1As shown, its circuit structure includes a backup protection power supply input terminal 1, the circuit structure includes a backup protection power supply input terminal 1, the backup protection power supply input terminal 1 is respectively connected to one end of the inductance vector module 2 and one end of the high short-circuit setting value overcurrent fuse 3, the other end of the inductance vector module 2 is connected to one end of the low short-circuit setting value overcurrent fuse 4, the two ends of the low short-circuit setting value overcurrent fuse 4 are connected in parallel with a high-frequency capacitor 7 with a capacitive filtering function, one side of the low short-circuit setting value overcurrent fuse 4 is provided with a remote signal switch 5 that acts simultaneously with it, the other end of the high short-circuit setting value overcurrent fuse 3 is connected to one end of the discharge type switch tube 6, the other end of the low short-circuit setting value overcurrent fuse 4 and the other end of the discharge type switch tube 6 are respectively connected to one end of a surge protector 8, and the other end of the surge protector 8 is connected to the ground terminal 9.

[0032] The backup protection power input terminal 1 is divided into two paths according to the input current: one path is the power frequency current, and the inductance vector module 2 can block the surge current and pass the power frequency current; the power frequency current is connected to the low short circuit setting value overcurrent fuse 4 to perform overcurrent protection; the low short circuit setting value overcurrent fuse 4 also has a fuse indication jumper, which works simultaneously with the remote signal switch 5 to perform remote signal alarm; in order to prevent the partial diversion of the lightning surge from causing false operation, a high-frequency capacitor 7 with a capacitive filtering function is configured in parallel with the low short circuit setting value overcurrent fuse 4; then connected to the PI end of the surge protector 8, and finally output from the PII end of the surge protector 8. The other surge current is connected in series with the discharge type switch tube 6 through the high short circuit setting value overcurrent fuse 3, and then connected to the PI end of the surge protector 8, and finally output from the PII end of the surge protector 8. The two backup protection current channels are combined and output to the ground terminal 9. The grounding terminal 9 of the power supply lightning arrester is connected to the power supply N terminal or the safety grounding PE terminal according to the design specifications.

[0033] The present invention ensures that the lightning surge current can be safely discharged when normal lightning protection is ensured; when a high-frequency or low-value short-circuit current fault occurs, the power supply is promptly cut off to prevent explosion accidents, thereby forming a power supply lightning surge protector (SPD) product element with integrated fuse target-type backup protection.

[0034] like Figure 2 As shown, it is an equivalent schematic diagram of the inductor vector module 2, which is characterized in that a high-Q inductor with low distributed capacitance parameters designed and configured according to the characteristics of the lightning current is used to achieve lightning current blocking.

[0035] The low short-circuit setting value overcurrent fuse 4 of the present invention is a fuse with dual blown indication and a rated 3A blown current protection characteristic; and it has a blown indication jumper and a remote signal switch lever 48, completing the integrated fuse backup protection power supply lightning arrester blown site and fault remote alarm functions.

[0036] like Figure 3a-3cAs shown, the working principle of the low short-circuit setting value overcurrent fuse 4 is as follows:

[0037] The low short-circuit setting value overcurrent fuse 4 is clamped in a fixed clamp frame and placed in an integrated lightning arrester housing. The low short-circuit setting value overcurrent fuse 4 is composed of a fuse tube body 41, a fuse 44, a conductive top cap 43, a conductive bottom cap 42 and a fuse indication jumper 47; the low short-circuit setting value overcurrent fuse 4 includes a fuse tube body 41, a conductive top cap 43 is provided on the top of the fuse tube body 41, a conductive bottom cap 42 is provided on the bottom of the fuse tube body 41, an energy storage spring 46 is fixed at the middle position of the fuse tube body 41, a fuse indication jumper 47 that can move up and down is provided on the energy storage spring 46, the fuse indication jumper 47 is arranged in the fuse tube body 41, the upper part of the fuse indication jumper 47 is fixed on the conductive top cap 43, the bottom of the fuse indication jumper 47 is connected to one end of the fuse 44, and the other end of the fuse 44 passes through the energy storage spring 46 and is connected to the conductive bottom cap 42. The fuse tube body 41 is filled with arc-extinguishing quartz sand 45 , and the arc-extinguishing quartz sand 45 is arranged below the energy storage spring 46 .

[0038] When the low short-circuit setting value overcurrent fuse 4 is not blown normally, its blown indication jumper 47 is pulled by the fuse 44 and pressed on the energy storage spring 46, and the blown indication jumper 47 is fixed on the conductive top cap 43. When the low short-circuit setting value overcurrent fuse 4 is not blown normally, its blown indication jumper 47 is fixed inside the conductive top cap 43 by the fuse 44 and does not move, and the conductive top cap 43, the fuse 44 and the conductive bottom cap 42 form a conductive circuit of the low short-circuit setting value overcurrent fuse 4. When the fuse 44 is overloaded and blown, the blown indication jumper 47 is released, cutting off the conductive circuit, and the blown indication jumper 47 moves and extends out of the lightning arrester housing W, indicating a fault, and at the same time triggering the remote signal switch to send a fault remote signal.

[0039] like Figure 4a , Figure 4b As shown, the high short-circuit setting value overcurrent fuse 3 in the present invention comprises a sleeve 32, and an upper cover 31 and a lower cover 33 are respectively provided at both ends of the sleeve 32, and the upper cover 31 and the lower cover 33 are connected by a multi-strand cross-section alloy fuse 34, and the sleeve 32 is sleeved on the outer side of the multi-strand cross-section alloy fuse 34. The sleeve 32 is filled with arc-extinguishing quartz sand.

[0040] The high short-circuit setting value overcurrent fuse 3 adopts a multi-strand cross-section alloy fuse 34 and utilizes the skin effect of high-frequency lightning current to ensure the safe passage of lightning surge current.

[0041] The low short-circuit setting value overcurrent fuse 4 is a fuse with a low setting ampere level; the high short-circuit setting value overcurrent fuse 3 is a lightning current fuse with a high setting ampere level.

[0042] The present invention uses a vector module to select the power frequency fault leakage current of the MOV of the lightning arrester as the target for the backup protection device to cooperate with the protection, and uses a small ampere-level special overcurrent fuse function module to control the low-value short-circuit setting value; in addition, a special discharge switch is used to bypass the high-value short-circuit setting value overcurrent fuse during the lightning surge to perform large short-circuit current classification protection. A dedicated vector shunt module is applied inside the backup protection appliance of the power supply lightning arrester to divide the lightning surge current and power frequency current that may pass through into two channels, which are monitored separately to achieve accurate and rapid power frequency overcurrent protection for the SPD, effectively preventing the occurrence of lightning arrester explosion accidents.

[0043] The present invention integrates the fuse device of target parameter control technology into the base of the lightning arrester, and combines it with the full C-class series MOV plug-in module to form a whole. The huge surge current of lightning strike and the interference of power frequency continuous current, the strict requirements of safe discharge gap and high voltage insulation distance are fully weighed, and the design is carefully designed, the layout is reasonably arranged, and the disadvantages are eliminated to achieve a compact structure, easy installation, safe and reliable integrated lightning arrester structure product.

[0044] like Figure 5 As shown, the backup protection power input terminal 1 of the present invention is connected to the discharge type switch tube 6 through the first copper bar a, and then connected to the high short-circuit setting value overcurrent fuse 3 below through the second copper bar b, and then connected to the PI terminal on the surge protector 8 through the third copper bar c. The backup protection power input terminal 1 is connected to the low short-circuit setting value overcurrent fuse 4 through a connection line, and then connected to the inductance vector module 2, the inductance vector module 2 is connected in parallel with the high-frequency capacitor 7, and then connected to the PI terminal on the surge protector 8 through the third copper bar c. Then it is output from the PII terminal of the surge protector 8 and connected to the ground terminal 9 (PE) through the copper bar. A remote signal switch 5 is provided on one side of the low short-circuit setting value overcurrent fuse 4, and the remote signal switch 5 is connected to the remote signal control conversion circuit board 10, and the remote signal control conversion circuit board 10 is connected to the remote signal output port 11. The remote signal switch 5, the remote signal control conversion circuit board 10, the remote signal output port 11 and the fuse indication jumper 47 together constitute a dual fuse indication alarm function device.

[0045] The present invention integrates a fuse backup protection disconnector with the function of identifying the amplitude-frequency difference of the current discharged through the lightning arrester. It is a lightning arrester that has the goal of targeting the power frequency fault current, shielding the lightning surge impact and discharging the pulsed large current, quickly and reliably eliminating the hidden dangers in the operation of the SPD, ensuring the safety of the low-voltage power supply system, preventing lightning strikes, surges, and preventing the SPD from exploding itself, and is armed with comprehensive backup protection technology and has dual fault indications of fuse degradation.

[0046] The present invention uses the difference characteristics of the discharge current flowing through the power lightning arrester by lightning strike and the power frequency continuous current of the power grid power supply flowing through the lightning arrester by fault, sets a shunt module combination, and realizes the standard of the double standard detection condition of the backup protection electrical appliance current tripping of the power lightning arrester. It is integrated inside the lightning arrester itself, has the function of identifying the amplitude-frequency difference of the discharge current through the lightning arrester, separates the lightning surge current and the power frequency fault continuous current, and accurately implements the differential overcurrent protection modular technology.

[0047] The present invention is based on the mechanism of protecting the power supply lightning arrester from damage under the power frequency fault current. It has the integrated modular lightning surge protector with the response conditions of setting the maximum power frequency current of the protection cutting off fault current to 3 amperes and the maximum time limit to three to five seconds of SPD backup protection.

[0048] The present invention relates to the application field of power frequency lightning arrester protection for voltage less than 1000 volts, and specifically to an integrated power lightning arrester technology that uses a fuse for backup protection, which integrates a target-type overcurrent protection fuse combination module and a power MOV lightning arrester module into an integrated lightning surge protection device, thereby realizing a new power lightning arrester product technology that has an accurate, complete, reliable and safe SPD backup protection function.

[0049] The present invention uses double fuses as special overcurrent protection devices to realize the overcurrent protection function of two currents with greatly different currents in one SPD backup protection device. It ensures that the protection function of timely fusing and disconnecting from the power grid can be implemented when a power frequency fault such as a continuous small ampere overcurrent caused by a transient overvoltage of the power supply, SPD degradation, etc. is caused, and it can also operate without error under a large kiloampere current of a lightning strike in normal conditions, avoiding fuse separation.

[0050] The present invention uses a vector module to perform branch control according to the different currents passing through the MOV of the lightning arrester. The low short-circuit setting value overcurrent fuse 4 is used to control the small ampere leakage current of the power frequency fault; and the high short-circuit setting value overcurrent fuse 3 is used to perform lightning surge and large short-circuit current classification protection. It has broken through the difficulty of realizing SPD backup precise protection equipment under the conditions of huge differences in lightning current and power frequency fault continuous current.

Claims

1. Integrated backup protection power supply lightning arrester, characterized in that: The circuit structure comprises a backup protection power supply input terminal (1), the backup protection power supply input terminal (1) is respectively connected to one end of an inductance vector module (2) and one end of a high short-circuit setting value overcurrent fuse (3), the other end of the inductance vector module (2) is connected to one end of a low short-circuit setting value overcurrent fuse (4), both ends of the low short-circuit setting value overcurrent fuse (4) are connected in parallel with a high-frequency capacitor (7) having a capacitive filtering function, one side of the low short-circuit setting value overcurrent fuse (4) is provided with a remote signal switch (5) acting simultaneously therewith, the other end of the high short-circuit setting value overcurrent fuse (3) is connected to one end of a discharge type switch tube (6), the other end of the low short-circuit setting value overcurrent fuse (4) and the other end of the discharge type switch tube (6) are respectively connected to one end of a surge protector (8), and the other end of the surge protector (8) is connected to a ground terminal (9); The low short-circuit setting value overcurrent fuse (4) comprises a fuse tube body (41), a conductive top cap (43) is provided on the top of the fuse tube body (41), a conductive bottom cap (42) is provided on the bottom of the fuse tube body (41), an energy storage spring (46) is fixed at a middle position in the fuse tube body (41), a fuse indication jumper (47) which can move up and down is provided on the energy storage spring (46), the fuse indication jumper (47) is arranged in the fuse tube body (41), the upper part of the fuse indication jumper (47) is fixed on the conductive top cap (43), the bottom of the fuse indication jumper (47) is connected to one end of a fuse (44), and the other end of the fuse (44) passes through the energy storage spring (46) and is connected to the conductive bottom cap (42); The low short-circuit setting value overcurrent fuse (4) and the high short-circuit setting value overcurrent fuse (3) are both arranged in the housing of the integrated lightning arrester; the integrated backup protection power supply lightning arrester has no external backup protection disconnector, and there is no need to equip an SPD backup protection device externally.

2. The integrated backup protection power supply lightning arrester according to claim 1, characterized in that: The low short-circuit setting value overcurrent fuse (4) is a low-value setting ampere-level fuse; the high short-circuit setting value overcurrent fuse (3) is a high-value setting ampere-level lightning current fuse.

3. The integrated backup protection power supply lightning arrester according to claim 1, characterized in that: The other end of the low short-circuit setting value overcurrent fuse (4) is connected to the PI end of the surge protector (8); the other end of the low short-circuit setting value overcurrent fuse (4) connected to the discharge type switch tube (6) is connected to the PI end of the surge protector (8); and the PII end of the surge protector (8) is connected to the ground end (9).

4. The integrated backup protection power supply lightning arrester according to claim 1 or 3, characterized in that: The ground terminal (9) is connected to the power supply N terminal or the safety ground PE terminal.

5. The integrated backup protection power supply lightning arrester according to claim 1, characterized in that: The fuse tube body (41) is filled with arc-extinguishing quartz sand (45), and the arc-extinguishing quartz sand (45) is arranged below the energy storage spring (46).

6. The integrated backup protection power supply lightning arrester according to claim 1, characterized in that: The high short-circuit setting value overcurrent fuse (3) comprises a sleeve (32), and an upper cover (31) and a lower cover (33) are respectively provided at two ends of the sleeve (32), the upper cover (31) and the lower cover (33) are connected by a multi-strand cross-section alloy fuse (34), and the sleeve (32) is sleeved on the outside of the multi-strand cross-section alloy fuse (34).

7. The integrated backup protection power supply lightning arrester according to claim 6, characterized in that: The sleeve (32) is filled with arc-extinguishing quartz sand.

8. The integrated backup protection power supply lightning arrester according to claim 1, characterized in that: Its hardware structure includes a backup protection power supply input terminal (1), the backup protection power supply input terminal (1) is connected to the high short-circuit setting value overcurrent fuse (3) below through the second copper busbar (b), and then connected to the discharge type switch tube (6) through the first copper busbar (a), and the discharge type switch tube (6) is then connected to the PI terminal on the surge protector (8) through the third copper busbar (c); another path of the backup protection power supply input terminal (1) is connected to the inductance vector module (2) through a connection line, and then connected to the low short-circuit setting value overcurrent fuse ( 4), a low short-circuit setting value overcurrent fuse (4) is connected in parallel with a high-frequency capacitor (7), and then connected to the PI terminal on the surge protector (8) through a third copper busbar (c); then outputted from the PII terminal of the surge protector (8) and connected to the ground terminal (9) through another copper busbar; a remote signal switch (5) is provided on one side of the low short-circuit setting value overcurrent fuse (4), the remote signal switch (5) is connected to a remote signal control conversion circuit board (10), and the remote signal control conversion circuit board (10) is connected to a remote signal output port (11).

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