CN216980481U - Intelligent tripping device for direct current circuit breaker - Google Patents

Abstract

The utility model discloses an intelligent tripping device for a direct current circuit breaker, which comprises an indirect tripping device, a microprocessing unit, a communication interface module and a capacitance energy storage module, wherein the indirect tripping device comprises an electromagnet, a power arm, a rotating shaft, an insulating coupler and a turning plate, the output end of the electromagnet is axially provided with a power arm chuck matched with the power arm, the lower end of the power arm is rotatably connected with the power arm chuck, the upper end of the power arm is connected with the rotating shaft, the rotating shaft is connected with the turning plate through the insulating coupler, the communication interface module is respectively connected with the microprocessing unit and the capacitance energy storage module through cables, and the output end of the capacitance energy storage module is connected with the electromagnet of the indirect tripping device through a tripping output lead. The intelligent tripping device provided by the utility model has the advantages of simple structure, small occupied volume, easiness in being integrated with a vehicle-mounted direct-current circuit breaker into a whole for use and the like, and when the intelligent tripping device is arranged on the direct-current circuit breaker, the direct-current circuit breaker can have an intelligent indirect tripping function.

Description

Intelligent tripping device for direct current circuit breaker

Technical Field

The utility model relates to an intelligent tripping device for a direct current circuit breaker, and belongs to the technical field of direct current circuit breakers.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening a current under a normal circuit condition, and closing, carrying, and opening a current under an abnormal circuit condition within a prescribed time. The circuit breaker is divided into a dc circuit breaker and an ac circuit breaker, wherein the dc circuit breaker is widely used in the fields of ships, rail transit, electric locomotives, etc., for example: the vehicle-mounted direct current circuit breaker is widely applied to traction systems of rail transit such as light rails, subways and electric cars.

As shown in fig. 1, a conventional dc circuit breaker generally includes a closing device (including a closing operation mechanism and a closing push rod), a main circuit, an auxiliary circuit, and a direct tripping device, and during operation, the closing device drives the main circuit and the auxiliary circuit to perform a closing and opening operation, and the direct tripping device performs an overcurrent tripping and tripping function. Because the existing direct tripping device is usually of an electromagnetic structure, current protection is realized by matching the electromagnetic force generated by an iron core and a coil with the spring force of the iron core, so that the defects of large volume, poor precision, easy spring force value attenuation caused by temperature rise of a circuit breaker and the like exist, the requirement of quick tripping cannot be well met, and an indirect tripping device is usually additionally configured to be matched with the tripping and tripping function of a vehicle-mounted direct current circuit breaker in the conventional traction system of rail traffic such as light rails, subways, electric trains and the like.

The conventional indirect tripping device mainly includes a latch type (see patent CN201310065245.8 for latching device of circuit breaker), a gear type (see patent CN202022571188.9 for switching on and off device of intelligent circuit breaker), a screw rod or link type (see patent CN201711119599.0 for tripping device of residual current circuit breaker and residual current circuit breaker), and the like. The indirect tripping devices have the problems of complex structure, large occupied space and incapability of being directly installed on the vehicle-mounted direct current circuit breaker, so that the corresponding external linkage interface can be only provided for the vehicle-mounted direct current circuit breaker at present, the indirect tripping function of the vehicle-mounted direct current circuit breaker is realized by connecting the indirect tripping devices with the peripheral indirect tripping devices through the external linkage interface, thus, the indirect tripping device has the defects of occupying more limited space in a vehicle, insensitive opening and closing speed, easily influenced action reliability at the installation position and the like, and the application requirement of the vehicle-mounted direct current circuit breaker can not be well met.

SUMMERY OF THE UTILITY MODEL

In view of the above problems in the prior art, an object of the present invention is to provide an intelligent trip device for a dc circuit breaker.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an intelligent trip gear for direct current circuit breaker, includes indirect trip gear, microprocessing unit, communication interface module and electric capacity energy storage module, indirect trip gear includes electro-magnet, power arm, pivot, insulating shaft coupling and turns over the board, the output of electro-magnet is equipped with the power arm chuck with power arm looks adaptation along its axial, the lower extreme and the power arm chuck rotatable coupling of power arm, the upper end of power arm links to each other with the pivot, the pivot is passed through insulating shaft coupling and is turned over the board and link to each other, communication interface module links to each other with microprocessing unit and electric capacity energy storage module respectively through the cable, electric capacity energy storage module's output links to each other with indirect trip gear's electro-magnet through tripping output wire.

According to the embodiment, the indirect tripping device further comprises a mounting bracket, the power arm chuck penetrates through the mounting bracket and then is connected with the lower end of the power arm, and the rotating shaft penetrates through the mounting bracket and then is connected with the upper end of the power arm.

One implementation scheme is that the insulation coupling comprises a connecting piece A, a connecting piece B and an intermediate connecting piece arranged between the connecting piece A and the connecting piece B, wherein the middle parts of one surfaces of the connecting piece A and the connecting piece B, which are far away from the intermediate connecting piece, are respectively and correspondingly provided with a connecting shaft sleeve part A and a connecting shaft sleeve part B, the two ends of one surfaces of the connecting piece A and the connecting piece B, which are towards the intermediate connecting piece, are respectively and correspondingly provided with a connecting pin part A and a connecting pin part B, the connecting shaft sleeve part A and the connecting shaft sleeve part B are respectively and correspondingly and axially provided with a metal adapter A connected with a rotating shaft and a metal adapter B connected with a turning plate, four notches are symmetrically arranged on the intermediate connecting piece, the four notches are integrally arranged in a cross shape, the connecting pin part A and the connecting pin part B can be respectively clamped into the notches in corresponding positions and can be in interference fit with the notches, the central axis of connecting axle sleeve portion A and connecting axle sleeve portion B coincides mutually, just, in the connecting piece A except that metal adapter A and the connecting piece B except that metal adapter B in the part and the middle connection piece are insulating material.

In a preferred embodiment, the notch is a U-shaped notch.

According to a preferable scheme, the connecting pin part A and the connecting pin part B are both cylindrical pins with limiting end parts.

The utility model provides an implementation scheme, microprocessing unit, communication interface module and electric capacity energy storage module set up on the circuit breaker body, microprocessing unit is connected with the major loop electricity, communication interface module links to each other with microprocessing unit and electric capacity energy storage module respectively through the cable, electric capacity energy storage module's output links to each other with indirect trip gear's electro-magnet through tripping operation output wire.

In a preferred scheme, the intelligent tripping device is further provided with an external cable protection cover and an internal cable protection cover.

According to a preferable scheme, the micro-processing unit comprises a Hall current sensor and a digital relay protection device, and the digital relay protection device is connected with the Hall current sensor through a cable.

According to the preferable scheme, the micro-processing unit further comprises a control MCU and a communication processor, the control MCU is respectively connected with the digital relay protection device and the communication processor through cables, and the communication processor is connected with the communication interface module through cables.

In a preferred scheme, working power supplies of the micro-processing unit and the capacitive energy storage module are both from the communication interface module.

In a preferred embodiment, the communication interface module includes a power interface, a signal interface, and a communication interface.

In a preferred embodiment, the cable connected between the communication interface module and the microprocessor unit includes an action contact signal line, an indicator light signal line, a fast trip signal line and an ethernet connection line.

According to the optimal scheme, the capacitor energy storage module comprises an energy storage capacitor, a charging control circuit, a triggering discharge circuit and a power-off protection circuit, the charging control circuit, the triggering discharge circuit and the power-off protection circuit are connected with the energy storage capacitor through cables, the energy storage capacitor is connected with an electromagnet of an indirect tripping device, and the triggering discharge circuit is connected with the communication interface module.

According to a preferable scheme, a cable connected between the capacitive energy storage module and the communication interface module comprises a fast tripping signal line and a capacitive charging state signal line.

Compared with the prior art, the utility model has the beneficial technical effects that:

the intelligent tripping device provided by the utility model has the advantages of simple structure, small occupied volume, easiness in being integrated with a vehicle-mounted direct current circuit breaker into a whole for use and the like, when the intelligent tripping device is arranged on the direct current circuit breaker, the direct current circuit breaker can have an intelligent indirect tripping function, the vehicle-mounted direct current circuit breaker can realize a rapid tripping function of fault current without an external linkage interface, and the intelligent tripping device has obvious practical value.

Drawings

Fig. 1 is a schematic diagram illustrating a connection structure between a closing device and a main circuit, an auxiliary circuit, and a direct trip device in a conventional dc circuit breaker;

fig. 2 is a schematic diagram illustrating a connection structure between a microprocessor unit and a communication interface module, a capacitive energy storage module, and an indirect trip device in an intelligent trip device for a dc circuit breaker according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the intelligent trip device in fig. 2 after an external cable protection cover and an internal cable protection cover are arranged;

fig. 4 is a schematic diagram illustrating a logical relationship between the microprocessor unit and the communication interface module, the capacitive energy storage module, and the indirect trip apparatus according to the embodiment of the present invention;

FIG. 5 is a functional block diagram of a micro-processing unit according to an embodiment of the present invention;

fig. 6 is a schematic block diagram of a communication interface module according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of a capacitive energy storage module according to an embodiment of the utility model;

fig. 8 is a schematic structural diagram of an indirect trip device according to an embodiment of the present invention;

fig. 9 is a schematic structural view of the indirect trip unit according to the embodiment of the present invention, after a mounting bracket is removed;

fig. 10 is a diagram illustrating a positional relationship between the indirect trip device and the closing push rod according to the embodiment of the present invention;

fig. 11 is a schematic structural view of an insulated coupling according to an embodiment of the present invention;

fig. 12 is an exploded view of an insulated coupling according to an embodiment of the present invention;

fig. 13 is a schematic view showing a structure of a connecting member a in the insulated coupling according to the embodiment of the present invention;

fig. 14 is a schematic structural view showing a connecting member B in the insulated coupling according to the embodiment of the present invention;

fig. 15 is a schematic view showing the structure of an intermediate coupling piece in the insulated coupling according to the embodiment of the present invention;

the numbers in the figures are as follows: 1. a conventional dc circuit breaker body; 11. a switching-on device; 111. a switching-on operating mechanism; 112. closing a push rod; 12. a main loop; 121. static contact; 122. a moving contact; 123. a pull rod; 124. a brake separating spring; 125. a lower busbar; 13. an auxiliary loop; 131. an auxiliary contact; 14. a direct trip device;

2. an indirect trip device; 21. an electromagnet; 22. a power arm; 23. a rotating shaft; 24. an insulating coupling; 241. a connecting piece A; 2411. connecting the shaft sleeve part A; 2412. a connecting pin part A; 2413. a metal adapter A; 2414. a reinforcing rib A; 242. a connecting piece B; 2421. a connecting shaft sleeve part B; 2422. a connecting pin part B; 2423. a metal adapter B; 2424. reinforcing ribs B; 243. an intermediate connecting sheet; 2431. a notch; 25. turning over a plate; 26. a power arm chuck; 27. mounting a bracket;

3. a micro-processing unit; 31. a Hall current sensor; 32. a digital relay protection device; 33. controlling the MCU; 34. a communication processor;

4. a communication interface module; 41. a power interface; 42. a signal interface; 43. a communication interface;

5. a capacitive energy storage module; 51. an energy storage capacitor; 52. a charge control circuit; 53. a trigger discharge circuit; 54. a power-loss protection circuit;

6. an outer cable shield; 7. an inner cable shield.

Detailed Description

The technical solution of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples.

Examples

First, referring to fig. 1, a conventional dc circuit breaker includes a circuit breaker body 1, where the circuit breaker body 1 includes a closing device 11, a main circuit 12, an auxiliary circuit 13, and a direct tripping device 14 electrically connected to the main circuit 12, the closing device 11 includes a closing operation mechanism 111 and a closing push rod 112, the main circuit 12 includes a fixed contact 121 (the fixed contact and an upper busbar are integrated), a movable contact 122, a pull rod 123, a tripping spring 124, and a lower busbar 125, the movable contact 122 is connected to the pull rod 123, the pull rod 123 is connected to the tripping spring 124, the auxiliary circuit 13 includes an auxiliary contact 131, the closing push rod 112 is respectively connected to the closing operation mechanism 111 and the movable contact 122, and the tripping spring 124 is connected to the auxiliary contact 131.

The traditional direct current circuit breaker realizes the operations of closing, opening and direct tripping as follows:

closing: a closing pulse current is applied to a coil (which belongs to common general knowledge) in the closing operation mechanism 111, the closing operation mechanism 111 pushes the closing push rod 112, the moving contact 122 is pushed by the closing push rod 112 until the moving contact 122 and the fixed contact 121 are closed, and meanwhile, the auxiliary contact 131 is driven to act by a pull rod 123 connected to the moving contact 122;

opening a brake: when the coil current in the closing operation mechanism 111 is cut off, the closing push rod 112 returns, the moving contact 122 returns to the opening position under the action of the opening spring 124 and the pull rod 123, and the auxiliary contact 131 acts at the same time;

direct overcurrent tripping: the tripping current threshold is preset in the circuit breaker body 1, when the current in the main loop 12 reaches the threshold, the direct tripping device 14 acts, and the circuit breaker trips, specifically: when the circuit breaker is in a closing state, the closing push rod 112 applies a pushing force to the movable contact 122, and the pushing force can overcome a pulling force of the opening spring 124 to the movable contact 122, so that the movable contact 122 is kept at a closing position; when the current in the main circuit 12 reaches the tripping current threshold, the direct trip device 14 applies an acting force to the closing push rod 112 to separate the closing push rod 112 from the movable contact 122 (this part is the prior art and belongs to the common knowledge), and at this time, the movable contact 122 no longer bears the pushing force of the closing push rod 112, so that the closing push rod can return to the opening position under the pulling force of the opening spring 124.

From the above, it can be seen that the conventional dc circuit breaker shown in fig. 1 has only a direct trip function by itself.

Please refer to fig. 2 to fig. 10: the embodiment provides an intelligent tripping device for a direct current circuit breaker, including indirect tripping device 2, micro-processing unit 3, communication interface module 4 and capacitive energy storage module 5, indirect tripping device 2 includes electro-magnet 21, power arm 22, pivot 23, insulating coupling 24 and turns over board 25, the output of electro-magnet 21 is equipped with power arm chuck 26 with power arm 22 looks adaptation along its axial, the lower extreme and the power arm chuck 26 rotatable coupling of power arm 22, the upper end of power arm 22 links to each other with pivot 23, pivot 23 links to each other with turning over board 25 through insulating coupling 24, communication interface module 4 links to each other with micro-processing unit 3 and capacitive energy storage module 5 respectively through the cable, capacitive energy storage module 5's output links to each other with indirect tripping device 2's electro-magnet 21 through tripping output wire.

If the intelligent tripping device is installed on the circuit breaker body 1, the turning plate 25 in the indirect tripping device 2 is detachably connected with the closing push rod 112 in the circuit breaker, when the electromagnet 21 is not electrified, the turning plate 25 is separated from the closing push rod 112, and when the electromagnet 21 is electrified, the turning plate 25 is in contact with the closing push rod 112; the micro-processing unit 3 is electrically connected to the main circuit 12 (specifically, electrically connected to the lower busbar 125 in the main circuit 12), so that the intelligent indirect tripping of the dc circuit breaker can be realized, and the specific operations are as follows:

the micro-processing unit 3 can monitor the current in the main loop 12 in real time; the communication interface module 4 is an external interface of the intelligent tripping device; the capacitance energy storage module 5 is used for storing electric energy required by the action of the indirect tripping device 2; when the micro-processing unit 3 detects that the current of the main loop 12 is abnormal, a protection action instruction is sent to the capacitive energy storage module 5 through the communication interface module 4, and after receiving the instruction, the capacitive energy storage module 5 releases the stored electric energy to the electromagnet 21 of the indirect tripping device 2 to start the indirect tripping device 2, so that the purpose of quick tripping is achieved;

the working principle of the indirect tripping device 2 is as follows:

a non-action state: when the current in the main loop 12 is normal, the dc circuit breaker is in a closing state, the electromagnet 21 is not energized, the indirect tripping device 2 is in a non-operating state, the electromagnet 21 does not apply an acting force to the power arm 22 through the power arm chuck 26, the power arm 22 is in a vertical state, the turning plate 25 is in a horizontal state, and a gap exists between the turning plate 25 and the closing push rod 112, that is, the turning plate 25 is separated from the closing push rod 112, the turning plate 25 does not apply an acting force to the closing push rod 112, and at this time, the indirect tripping device 2 has no influence on the closing push rod 112;

the action state is as follows: when the current in the main loop 12 is abnormal, the electromagnet 21 is electrified, the indirect tripping device 2 is in an action state, the electrified electromagnet 21 exerts acting force on the power arm 22 through the power arm chuck 26, the power arm 22 rotates under the acting force, the power arm 22 rotates to drive the rotating shaft 23 to rotate, the rotating shaft 23 drives the turning plate 25 to rotate through the insulating coupler 24, the turning plate 25 rotates and then contacts with the closing push rod 112, so that the closing push rod 112 acts on the closing push rod 112, the closing push rod 112 rotates under the action of the turning plate 25 and then is separated from the movable contact 122, and then the movable contact 122 rapidly opens under the action of the opening spring 124, so that tripping is realized.

Referring to fig. 3, in the present embodiment, the intelligent trip device further includes an outer cable protection cover 6 and an inner cable protection cover 7 to protect the inner and outer cables from insulation breakdown and mechanical damage.

Referring to fig. 5 again, in the present invention, the micro processing unit 3 includes a hall current sensor 31 and a digital relay protection device 32, the digital relay protection device 32 is connected to the hall current sensor 31 through a cable, the hall current sensor 31 is electrically connected to the main circuit 12 (specifically, the lower busbar 125 in the main circuit 12 passes through the hall current sensor 31 in the micro processing unit 3, so that the hall current sensor 31 is electrically connected to the main circuit 12), so as to monitor the current in the main circuit 12 in real time, and transmit the measured current information to the digital relay protection device 32, and the digital relay protection device 32 provides relay protection. By the design, the micro-processing unit 3 has a current protection/monitoring function, and the intelligent tripping device has double functions of relay protection and indirect tripping. The hall current sensor 31 and the digital relay protection device 32 are all realized by adopting the prior art.

In addition, the micro-processing unit 3 further comprises a control MCU 33 and a communication processor 34, the control MCU 33 is connected with the digital relay protection device 32 and the communication processor 34 through cables, and the communication processor 34 is connected with the communication interface module 4 through cables. The hall current sensor 31 detects the current in the main loop 12 in real time and transmits the detected current information to the digital relay protection device 32, the digital relay protection device 32 analyzes and processes the received current information, and when the analysis result shows that the current is abnormal, the control MCU 33 sends a protection action instruction to the capacitive energy storage module 5 through the communication processor 34 and the communication interface module 4.

In a preferred embodiment, the current protection/monitoring functions of the micro-processing unit 3 include a current rise rate (di/dt) protection/monitoring function, a current increment (Δ I) protection/monitoring function, and an instantaneous overcurrent (Imax) protection/monitoring function.

In this embodiment, the working power supplies of the micro-processing unit 3 and the capacitive energy storage module 5 are both from the communication interface module 4, and the working currents are all integrated into the communication interface module 4, so that the working power supplies do not need to be separately provided, and the device structure can be simplified.

Referring to fig. 6 again, in the present embodiment, the communication interface module 4 includes a power interface 41, a signal interface 42 and a communication interface 43. Specifically, the communication interface module 4 includes a panel, and two electrical connectors are disposed on the panel, one of the electrical connectors is a power interface 41 and a signal interface 42, and the other electrical connector is a communication interface 43; the power interface 41 is used for connecting a power supply, the signal interface 42 is used for connecting the capacitive energy storage module 5, the communication interface 43 is used for connecting the micro processing unit 3 (specifically, the communication processor 34 of the micro processing unit 3), and the communication interface may be a standard ethernet interface.

The cable connected between the communication interface module 4 and the micro-processing unit 3 comprises an action contact signal wire, an indicator light signal wire, a fast tripping signal wire and an Ethernet connecting wire. The action contact signal line, the indicator light signal line and the fast tripping signal line are connected with the signal interface 42, and the Ethernet connecting line is connected with the communication interface 43.

Referring to fig. 7 again, in the present embodiment, the capacitor energy storage module 5 includes an energy storage capacitor 51, a charging control circuit 52, a trigger discharge circuit 53 and a power loss protection circuit 54, the charging control circuit 52, the trigger discharge circuit 53 and the power loss protection circuit 54 are all connected to the energy storage capacitor 51 through cables, the energy storage capacitor 51 is connected to the electromagnet 21 of the indirect trip device 2, and the trigger discharge circuit 53 is connected to the communication interface module 4. The charging control circuit 52 is used for controlling the charging of the energy storage capacitor 51, including the floating charging to the working voltage and the holding capacitor; the trigger discharge circuit 53 starts the energy storage capacitor 51 to discharge the indirect trip device 2 quickly when receiving the protection action signal sent by the micro-processing unit 3 through the communication interface module 4; the power-loss protection circuit 54 is used for quickly consuming the electric energy stored in the energy storage capacitor 51 through the internal resistor when the input power of the capacitive energy storage module 5 loses voltage so as to avoid electric shock of personnel.

And the cable connected between the capacitive energy storage module 5 and the communication interface module 4 comprises a quick trip signal line and a capacitive charging state signal line.

Referring to fig. 8 and 10, in the present invention, the indirect trip unit 2 further includes a mounting bracket 27, the power arm clamp 26 passes through the mounting bracket 27 and then is connected to the lower end of the power arm 22, and the rotating shaft 23 passes through the mounting bracket 27 and then is connected to the upper end of the power arm 22, so that the connection stability between the electromagnet 21 and the power arm clamp 26, the power arm 22, and the rotating shaft 23 can be enhanced.

Referring to fig. 11 to 15, in the present invention, the insulation coupling 24 includes a connecting piece a 241, a connecting piece B242, and an intermediate connecting piece 243 disposed between the connecting piece a 241 and the connecting piece B242, a connecting shaft sleeve portion a 2411 and a connecting shaft sleeve portion B2421 are respectively and correspondingly disposed in the middle of one side of the connecting piece a 241 and the connecting piece B242 away from the intermediate connecting piece 243, a connecting pin portion a 2412 and a connecting pin portion B2422 are respectively and correspondingly disposed at two ends of one side of the connecting piece a 241 and the connecting piece B242 facing the intermediate connecting piece 243, a metal adapter 241a 3 connected to the rotating shaft 23 and a metal adapter B2423 connected to the connecting piece turning plate 25 are respectively and correspondingly and axially disposed in the connecting shaft sleeve portion a 2411 and the connecting shaft sleeve portion B2421, four notches 2431 are symmetrically disposed on the intermediate connecting piece, four breach 2431 whole be the cross setting, connect round pin portion A2412 and connect round pin portion B2422 can block respectively in the breach of corresponding position 2431 to can with breach 2431 interference fit, connect axle sleeve portion A2412 and the central axis of connecting axle sleeve portion B2422 coincide mutually, the part except that metal adapter A2413 in connecting piece A241 and the part except that metal adapter B2423 in the connecting piece B242 and intermediate connection piece 243 are insulating material.

When the insulating coupling 24 is assembled, only the corresponding connecting pin part A2412 and the connecting pin part B2422 in the connecting piece A241 and the connecting piece B242 need to be clamped into the corresponding notches 2431 respectively, when the connecting piece A241 rotates, the torque can be transmitted to the connecting piece B242 through the intermediate connecting piece 243, and as the connecting pin part A2412 and the connecting pin part B2422 of the connecting piece A241 and the connecting piece B242 can freely move in the notches 2431 of the intermediate connecting piece 243, the non-concentricity of the rotating shafts on two sides can be compensated, so that the assembling difficulty is reduced, and the action reliability is improved; moreover, the insulating coupler 24 has a simple structure, does not need any fastener during assembly, and is easy to assemble and overhaul; in addition, because the part of the connecting piece A241 except the metal adapter A2413, the part of the connecting piece B242 except the metal adapter B2423 and the intermediate connecting sheet 243 are made of insulating materials, the air gap and the creepage distance of the insulating coupling 24 can meet the requirement of electrical insulation strength in GB/T21413.1, the electrical gap is larger than 22mm, the impulse voltage resistant grade reaches more than 18kV, the electric insulating coupling has excellent electrical insulation level, and the application requirement of electrical equipment can be fully met.

In this embodiment, the gap 2431 is preferably a U-shaped gap, which facilitates the free movement of the connection pin a 2412 and the connection pin B2422 in the gap 2431.

In addition, the connection pin part A2412 and the connection pin part B2422 are preferably cylindrical pins with limiting end parts, so that the connection stability between the connection pieces A241 and B242 and the intermediate connecting piece 243 can be enhanced.

Preferably, two sides of the connecting shaft sleeve portion a 2411 and two sides of the connecting shaft sleeve portion B2421 are respectively and correspondingly provided with a reinforcing rib a 2414 and a reinforcing rib B2424, so as to play a reinforcing role.

It is finally necessary to point out here: the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention will be covered within the scope of the present invention.

Claims (9)

1. The utility model provides an intelligent trip gear for direct current circuit breaker which characterized in that: the device comprises an indirect tripping device, a micro-processing unit, a communication interface module and a capacitance energy storage module, wherein the indirect tripping device comprises an electromagnet, a power arm, a rotating shaft, an insulating coupler and a turning plate, the output end of the electromagnet is provided with a power arm chuck matched with the power arm along the axial direction of the output end, the lower end of the power arm is rotatably connected with the power arm chuck, the upper end of the power arm is connected with the rotating shaft, the rotating shaft is connected with the turning plate through the insulating coupler, the communication interface module is respectively connected with the micro-processing unit and the capacitance energy storage module through cables, and the output end of the capacitance energy storage module is connected with the electromagnet of the indirect tripping device through a tripping output wire.

2. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the indirect tripping device further comprises a mounting bracket, the power arm chuck penetrates through the mounting bracket and then is connected with the lower end of the power arm, and the rotating shaft penetrates through the mounting bracket and then is connected with the upper end of the power arm.

3. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the insulating coupling comprises a connecting piece A, a connecting piece B and an intermediate connecting piece arranged between the connecting piece A and the connecting piece B, wherein the middle parts of one surfaces of the connecting piece A and the connecting piece B, which are far away from the intermediate connecting piece, are respectively and correspondingly provided with a connecting shaft sleeve part A and a connecting shaft sleeve part B, the two ends of one surfaces of the connecting piece A and the connecting piece B, which are towards the intermediate connecting piece, are respectively and correspondingly provided with a connecting pin part A and a connecting pin part B, the connecting shaft sleeve part A and the connecting shaft sleeve part B are respectively and correspondingly and axially provided with a metal adapter A connected with the rotating shaft and a metal adapter B connected with the turning plate, the intermediate connecting piece is symmetrically provided with four gaps, the four gaps are integrally arranged in a cross shape, the connecting pin part A and the connecting pin part B can be respectively clamped into the gaps in corresponding positions and can be in interference fit with the gaps, and the central axes of the connecting shaft sleeve part A and the connecting shaft sleeve part B coincide with each other, and the part of the connecting piece A except the metal adapter A and the part of the connecting piece B except the metal adapter B and the middle connecting sheet are all made of insulating materials.

4. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the micro-processing unit comprises a Hall current sensor and a digital relay protection device, and the digital relay protection device is connected with the Hall current sensor through a cable.

5. The intelligent trip unit for a dc circuit breaker according to claim 4, wherein: the micro-processing unit further comprises a control MCU and a communication processor, the control MCU is respectively connected with the digital relay protection device and the communication processor through cables, and the communication processor is connected with the communication interface module through cables.

6. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the communication interface module comprises a power interface, a signal interface and a communication interface.

7. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the capacitor energy storage module comprises an energy storage capacitor, a charging control circuit, a triggering discharge circuit and a power-off protection circuit, wherein the charging control circuit, the triggering discharge circuit and the power-off protection circuit are all connected with the energy storage capacitor through cables, the energy storage capacitor is connected with an electromagnet of the indirect tripping device, and the triggering discharge circuit is connected with the communication interface module.

8. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the cable connected between the communication interface module and the micro-processing unit comprises an action contact signal wire, an indicator light signal wire, a quick tripping signal wire and an Ethernet connecting wire.

9. The intelligent trip unit for a dc circuit breaker according to claim 1, wherein: the cable connected between the capacitance energy storage module and the communication interface module comprises a fast tripping signal line and a capacitance charging state signal line.

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