Direct-current magnetic field circuit breaker tripping device and method of large-scale generator set excitation system

Abstract

The invention relates to the technical field of electrical switch equipment, and particularly discloses a direct-current magnetic field circuit breaker tripping device and method of a large generator set excitation system, and the direct-current magnetic field circuit breaker tripping device and method are used in cooperation with a lock catch shifting fork. Comprising a base, a tripping fork assembly which is rotatably installed on the base around the X-axis direction and is used in cooperation with a lock catch shifting fork, a fixing assembly installed at the bottom of the base, and an elastic reset assembly which is installed on the fixing assembly and is in transmission connection with the tripping fork assembly. And the tripping rod assembly is rotationally mounted on the fixing assembly around the Z-axis direction and is in transmission fit with the tripping fork assembly. The invention also discloses a method thereof. According to the invention, independent tripping and opening can be effectively realized, the opening redundancy design is realized, and the reliability of fault de-excitation of the direct current excitation system can be effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switchgear, and more particularly to a DC magnetic field circuit breaker tripping device and method for an excitation system of a large generator set. Background Art

[0002] Compared with conventional DC circuit breakers used in other power supply systems, DC magnetic field circuit breakers have higher requirements for the speed of breaking and voltage building, and therefore require a faster opening speed.

[0003] In addition to separating the moving contacts, conventional opening methods often fail to quickly separate the moving contacts, the moving iron core of the electromagnetic mechanism, the locking mechanism, etc. at the same time due to the large mass and inertia of the opening auxiliary moving parts, such as the closing electromagnetic mechanism moving iron core, the locking mechanism, etc., and the limited opening power provided by the opening spring, resulting in a low contact opening speed.

[0004] The prior art lacks a DC magnetic field circuit breaker tripping device that is applicable to the excitation system of a large generator set and can achieve independent tripping. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a DC field circuit breaker tripping device and method for the excitation system of a large generator set;

[0006] The solution adopted by the present invention to solve the technical problem is:

[0007] A DC magnetic field circuit breaker tripping device of a large generator set excitation system is used in conjunction with a lock fork; it comprises a base, a tripping fork assembly rotatably mounted on the base around an X-axis direction and used in conjunction with the lock fork, a fixing assembly mounted at the bottom of the base, an elastic reset assembly mounted on the fixing assembly and transmission-connected to the tripping fork assembly, and a tripping rod assembly rotatably mounted on the fixing assembly around a Z-axis direction and transmission-coordinated with the tripping fork assembly.

[0008] In some possible implementations, the trip fork assembly includes a support mounted on a side of the base close to the lock fork, a trip fork hingedly coupled to the support and provided with a receiving cavity, and a Z-direction limiting surface provided on the support and used to limit the rotation of the trip fork.

[0009] In some possible implementations, the release fork includes a seat body hingedly matched with the support, and two groups of contact fingers on the seat body and forming a V-shaped structure; a receiving cavity is formed between the two groups of contact fingers, and one end of the lock fork extends into the receiving cavity; the angle formed by the two groups of contact fingers is an acute angle;

[0010] When the gate is opened, under the drive of the trip rod assembly, the contact finger located above the accommodating cavity rotates around the X-axis direction and abuts against the lock fork, and drives the lock fork to move around the X-axis direction.

[0011] In some possible implementations, the trip fork assembly further includes an X-axis shaft rod arranged along the X-axis direction and mounted on the support, a bearing is sleeved on the outer side of the X-axis shaft rod, and the bearing is connected to the trip fork.

[0012] In some possible embodiments, the trip rod assembly includes a Z-axis shaft installed on the fixing assembly and arranged along the Z-axis direction, and a rod body sleeved on the outside of the Z-axis shaft and rotatably matched; one end of the rod body extends into the accommodating cavity.

[0013] In some possible embodiments, the trip rod assembly further includes a roller disposed at one end of the rod body extending into the accommodating cavity, and a needle bearing sleeved on the outside of the Z-axis shaft and connected to the rod body; the rod body is sleeved on the outside of the needle bearing.

[0014] In some possible embodiments, the rod body includes a pull rod with one end sleeved on the outside of a needle bearing, and a driven rod connected to the end of the pull rod close to the needle bearing and with axes parallel to each other; the roller is arranged at an end of the driven rod away from the pull rod; the length of the pull rod is greater than the length between the roller and the needle bearing.

[0015] In some possible embodiments, the elastic reset assembly includes an articulated seat installed on the side of the release fork assembly away from the locking fork, a guide shaft connected to the articulated seat and rotating around the X-axis direction, a spring sleeved on the outside of the guide shaft, a limit plate sleeved on the outside of the guide shaft and connected to the spring away from the release fork assembly, and a limit shaft arranged along the X-axis direction and plugged into one end of the guide shaft away from the locking fork; a U-shaped socket is arranged on the guide shaft for use with the limit shaft.

[0016] In some possible implementations, the fixing components are in two groups and are close to one side to form a chamber, and the elastic reset component is installed in the chamber;

[0017] An installation groove for installing a trip rod assembly and communicating with the chamber is formed between the fixing assembly and the base; a U-shaped groove communicating with the installation groove and used for installing a trip fork assembly is provided on the base; the installation groove and the U-shaped groove are provided on a side close to the lock fork; the U-shaped grooves are located directly above the chamber and are communicated with each other.

[0018] A method for using a DC field circuit breaker tripping device of a large generator set excitation system according to the above-mentioned method specifically comprises the following steps:

[0019] When the DC magnetic field circuit breaker is opened, the trip rod assembly is controlled to rotate around the Z-axis direction to drive the trip fork assembly to rotate around the X-axis direction, so that the trip fork assembly contacts the top surface of the lock fork and exerts a force on the trip fork assembly to rotate downward around the X-axis direction. At the same time, the elastic reset assembly changes from the initial state to the compressed state, and the opening is completed;

[0020] After the opening is completed, the trip fork assembly is reset under the elastic force of the elastic reset assembly and waits for the next opening.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can realize symmetrical redundancy of tripping and opening of an electrical switch by setting a trip rod assembly to drive a trip fork assembly to contact and abut with a lock fork; the present invention realizes opening by driving the trip fork assembly to cooperate with the trip rod assembly to realize opening, and is applied to an electrical switch to realize rapidity and reliability of opening; and can realize the transfer of electromagnetic force to ensure the electrical insulation performance between the primary circuit and the secondary circuit of the electrical switch;

[0023] The present invention can effectively realize independent tripping and opening of the switch, realize opening redundant design, and effectively ensure the reliability of fault demagnetization of the DC excitation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention and the lock fork;

[0025] Figure 2 It is a schematic diagram of the structure of the fixing assembly, the tripping rod assembly and the tripping fork assembly in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the trip fork assembly and the elastic reset assembly in the present invention;

[0027] Figure 4 is a side view of the release fork assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the connection relationship between the trip fork assembly and the elastic reset assembly in the present invention;

[0029] Figure 6 It is a schematic diagram of the position relationship between the trip rod assembly and the trip fork assembly when the circuit breaker is closed;

[0030] Figure 7 It is a structural schematic diagram of the trip rod assembly in the present invention;

[0031] Wherein: 1. base; 2. trip fork assembly; 21. trip fork; 211. seat body; 212. contact finger; 213. accommodating chamber; 22. bearing; 23. X-axis rod; 24. support; 25. Z-axis limit surface; 3. trip rod assembly; 31. roller; 32. needle bearing; 33. lever; 34. driven rod; 35. Z-axis rod; 4. fixing assembly; 5. elastic reset assembly; 51. spring; 52. guide shaft; 53. limit shaft; 531. U-shaped socket; 54. limit plate; 6. locking fork. DETAILED DESCRIPTION

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention is described in detail below.

[0034] like Figure 1-Figure 7 As shown:

[0035] A DC magnetic field circuit breaker tripping device of a large generator set excitation system, used in conjunction with a lock fork 6; comprising a base 1, a tripping fork assembly 2 rotatably mounted on the base 1 around the X-axis direction and used in conjunction with the lock fork 6, a fixing assembly 4 mounted at the bottom of the base 1, an elastic reset assembly 5 mounted on the fixing assembly 4 and transmission-connected to the tripping fork assembly 2, and a tripping rod assembly 3 rotatably mounted on the fixing assembly 4 around the Z-axis direction and transmission-coordinated with the tripping fork assembly 2;

[0036] Preferably, the base 11 is made of non-metallic material with insulation and flame retardant properties;

[0037] Specifically, the opening electromagnet is connected to one end of the trip rod assembly 3 away from the trip fork assembly 2, and the opening electromagnetic force is used to drive the trip rod assembly 3 to rotate around the Z axis; the lock fork 6 is connected to the contact system of the DC magnetic field circuit breaker;

[0038] When opening the gate, the trip rod assembly 3 rotates around the X-axis direction and abuts against the lock fork 6, driving the lock fork 6 to rotate around the X-axis to achieve rapid opening of the gate; during the opening process, the elastic reset assembly 5 will be converted from the initial state to the compressed state;

[0039] After the opening is completed, the trip rod assembly 3 is no longer subjected to the electromagnetic force applied by the opening electromagnet, and under the elastic force of the elastic reset assembly 5, it recovers from the compressed state to the initial state, thereby driving the trip fork assembly 2 to reset and wait for the next opening.

[0040] In some possible embodiments, the trip fork assembly 2 includes a support 24 installed on one side of the base 1 close to the locking fork 6, a trip fork 21 hingedly cooperated with the support 24 and provided with a accommodating cavity 213, and a Z-direction limiting surface 25 provided on the support 24 and used to limit the rotation of the trip fork 21. When the Z-direction limiting surface 25 and the trip fork 21 are close to one side and abut against each other, the trip fork 21 is not in contact with the locking fork 6.

[0041] Specifically, a limit block is provided on one side of the base 1 close to the tripping fork 21, and the side of the limit block close to the tripping fork 21 is a Z-direction limit surface 25. When the tripping fork assembly 2 is reset, the tripping fork 21 and the Z-direction limit surface 25 abut against each other on one side, thereby limiting their movement around the X-axis direction.

[0042] When the DC magnetic field circuit breaker is in the closed state, the tripping fork 21 contacts and abuts against the Z-direction limit surface 25, and the tripping fork 21 does not contact the locking fork 6, that is, when it is in the closed state, a safety gap H will be formed between the tripping fork 21 and the locking fork 6 to ensure that the tripping fork 21 does not interfere with the locking fork 6.

[0043] In some possible embodiments, the release fork 21 includes a seat body 211 hingedly matched with the support 24, and two groups of contact fingers 212 on the seat body 211 and forming a V-shaped structure; a receiving cavity 213 is formed between the two groups of contact fingers 212, and one end of the lock fork 6 extends into the receiving cavity 213; the angle formed by the two groups of contact fingers 212 is as follows: Figure 4 As shown, the included angle is A, and A is an acute angle;

[0044] When the gate is opened, the trip rod assembly 3 rotates around the Z axis and applies a force to the contact finger 212 located below the accommodating cavity 213, thereby driving the contact finger 212 located above the accommodating cavity 213 to rotate clockwise around the X axis and abut against the lock fork 6, hitting the lock fork 6, so that the lock fork 6 moves counterclockwise around the X axis;

[0045] When the Z-direction limiting surface 25 and the tripping fork 21 are close to each other and abut against one side, the locking fork 6 and the two groups of contact fingers 212 are not in contact.

[0046] In some possible implementations, in order to effectively realize the rotation of the trip fork assembly 2 around the X-axis direction;

[0047] The release fork assembly 2 also includes an X-axis shaft 23 arranged along the X-axis direction and mounted on the support 24, and a bearing 22 is sleeved on the outer side of the X-axis shaft 23, and the bearing 22 is connected to the seat body 211 of the release fork 21 and sleeved in the seat body 211; the inner ring of the bearing 22 is fixedly connected to the X-axis shaft 23;

[0048] Preferably, the bearing 22 is an oil-free bearing, which can effectively reduce friction and improve movement reliability.

[0049] In some possible embodiments, in order to effectively drive the contact finger 212 to rotate around the X-axis through the trip rod assembly 3, thereby achieving the impact on the lock fork 6 and realizing the opening of the gate; the trip rod assembly 3 includes a Z-axis shaft 35 installed on the fixing assembly 4 and arranged along the Z-axis direction, and a rod body that is sleeved on the outside of the Z-axis shaft 35 and rotates together; one end of the rod body extends into the accommodating cavity 213; the other end of the rod body is connected to the opening electromagnet through a connecting rod, and the electromagnetic force of the opening electromagnet drives the rod body to rotate around the Z-axis direction, so that the other end of the rod body applies a force to the trip fork 21, causing it to move clockwise around the X-axis direction and hit the lock fork 6.

[0050] In some possible implementations, the trip rod assembly 3 further includes a roller 31 disposed at one end of the rod body extending into the accommodating cavity 213, and a needle bearing 32 sleeved on the outside of the Z-axis shaft 35 and connected to the rod body; the rod body is sleeved on the outside of the needle bearing 32;

[0051] The rod body comprises a pull rod 33 with one end sleeved on the outside of the needle bearing 32, and a driven rod 34 connected to the end of the pull rod 33 close to the needle bearing 32 and with axes parallel to each other; the roller 31 is arranged at the end of the driven rod 34 away from the pull rod 33; the length of the pull rod 33 is greater than the length between the roller 31 and the needle bearing 32, so that the gate can be opened under the action of a small electromagnetic force; the pull rod 33 and the driven rod 34 are on the same horizontal plane after being installed on the fixing component 4, and the axes of the two are parallel to each other and not colinear;

[0052] Specifically, under the action of the electromagnetic force, the pull rod 33 rotates around the Z-axis direction away from the fixed component 4, so that the driven rod 34 moves toward the fixed component 4, and applies a force to the tripping fork 21, so that the tripping fork 21 moves clockwise around the X-axis direction, so that the contact finger 212 located above the lock fork 6 hits the lock fork 6, driving it to move counterclockwise around the X-axis direction;

[0053] Preferably, a U-shaped socket is provided at one end of the pull rod 33 away from the driven rod 34, which can reduce the deflection force generated by the electromagnetic force due to the swing of the release lever and ensure the reliability of movement; a roller is provided on the driven rod 34 to reduce friction.

[0054] In some possible implementations, in order to enable the trip fork assembly 2 to be reset after the switch is opened;

[0055] The elastic reset assembly 5 includes an articulated seat installed on the side of the release fork assembly 2 away from the lock fork 6, a guide shaft 52 connected to the articulated seat and rotating around the X-axis direction, a spring 51 sleeved on the outside of the guide shaft 52, a limit plate 54 sleeved on the outside of the guide shaft 52 and connected to the spring 51 away from the release fork assembly 2, and a limit shaft 53 arranged along the X-axis direction and plugged with the end of the guide shaft 52 away from the lock fork 6; a U-shaped socket 531 used in conjunction with the limit shaft 53 is arranged on the guide shaft 52, and the opening of the U-shaped socket 531 is arranged on the side away from the articulated seat.

[0056] A groove is provided on the side of the contact finger 212 at the bottom of the accommodating cavity 213 close to the elastic reset component 5, and the hinge seat is installed in the groove. One end of the guide shaft 52 is hingedly matched with the hinge seat to realize rotation around the X-axis direction; the spring 51 is provided between the limit plate 54 and the hinge seat, and when the release fork 21 rotates clockwise around the X-axis, the spring 51 will be compressed; the limit shaft 53 is fixedly provided on the fixing component 4 and is plugged into and matched with the end of the U-shaped socket 531 of the guide shaft 52 away from the hinge seat.

[0057] In some possible implementations, in order to effectively realize the installation of the trip fork assembly 2, the trip rod assembly 3, and the elastic reset assembly 5; the fixing assembly 4 is two groups and close to one side to form a chamber, and the elastic reset assembly 5 is installed in the chamber;

[0058] A mounting groove for mounting the trip rod assembly 3 and communicating with the chamber is formed between the fixing assembly and the base 1;

[0059] A U-shaped groove connected to the mounting groove and used for mounting the release fork assembly 2 is provided on the base 1; the mounting groove and the U-shaped groove are arranged on a side close to the lock fork 6; the U-shaped grooves are located directly above the chamber and are connected to each other.

[0060] Preferably, the tripping rod assembly 3 can be a group or two groups that move independently, and the two groups of tripping rod assemblies 3 can independently achieve a quick tripping action by cooperating with the electromagnetic force;

[0061] When there are two sets of trip rod assemblies 3, they will be symmetrically arranged and located on both sides of the trip fork assembly 2. By arranging two sets of trip rod assemblies 3, symmetrical redundancy of the tripping and opening of the electrical switch can be achieved;

[0062] By rotating and cooperating with the trip rod assembly 3, the trip fork 21 and the lock fork, the electromagnetic force can be transferred to ensure the electrical insulation performance between the primary circuit and the secondary circuit of the electrical switch.

[0063] A method for using a DC field circuit breaker tripping device of a large generator set excitation system according to the above-mentioned method specifically comprises the following steps:

[0064] When the DC magnetic field circuit breaker is opened, the electromagnetic force of the opening electromagnet drives the connecting rod connected to the opening electromagnet to move away from the trip rod assembly 3, so that the pull rod 33 connected to the other end of the connecting rod moves around the Z-axis direction to the side close to the lock fork 6. Based on the lever principle, the driven rod 34 moves to the side close to the trip fork assembly 2, and the roller 31 squeezes the contact finger 212 located below the accommodating cavity 213, so that the trip fork 21 rotates clockwise around the X-axis direction and hits the top surface of the lock fork 6; in this process, the force applied by the spring 51 in the elastic reset assembly 5 to the trip fork 21 will change from the initial state to the compression state, and the opening is completed;

[0065] The tripping electromagnet is energized for a short time. After the tripping and opening action is completed, the tripping electromagnet automatically resets. Under the elastic force of the spring 51, the tripping fork assembly 2 resets and waits for the next tripping.

[0066] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A DC field circuit breaker tripping device for a large generator set excitation system, used in conjunction with a lock fork; characterized in that: It includes a base, a trip fork assembly mounted on the base and rotatable around the X-axis and used in conjunction with a lock fork, a fixed assembly mounted at the bottom of the base, an elastic reset assembly mounted on the fixed assembly and transmission-connected to the trip fork assembly, and a trip rod assembly mounted on the fixed assembly and rotatable around the Z-axis and transmission-coordinated with the trip fork assembly.

2. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 1, characterized in that: The release fork assembly includes a support installed on one side of the base close to the lock fork, a release fork hingedly matched with the support and provided with a receiving cavity, and a Z-direction limiting surface arranged on the support and used for limiting the rotation of the release fork.

3. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 2, characterized in that: The release fork comprises a seat body hingedly matched with the support, and two groups of contact fingers on the seat body and forming a V-shaped structure; a receiving cavity is formed between the two groups of contact fingers, and one end of the lock fork extends into the receiving cavity; the angle formed by the two groups of contact fingers is an acute angle; When the gate is opened, under the drive of the trip rod assembly, the contact finger located above the accommodating cavity rotates around the X-axis direction and abuts against the lock fork, and drives the lock fork to move around the X-axis direction.

4. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 2, characterized in that: The release fork assembly also includes an X-axis shaft rod arranged along the X-axis direction and installed on the support. A bearing is sleeved on the outer side of the X-axis shaft rod, and the bearing is connected to the release fork.

5. The DC field circuit breaker tripping device of the excitation system of a large generator set according to claim 2, characterized in that: The trip rod assembly comprises a Z-axis shaft rod installed on the fixing assembly and arranged along the Z-axis direction, and a rod body sleeved on the outside of the Z-axis shaft rod and rotatably matched; one end of the rod body extends into the accommodating cavity.

6. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 5, characterized in that: The trip rod assembly also includes a roller arranged at one end of the rod body extending into the accommodating cavity, and a needle bearing sleeved on the outside of the Z-axis shaft and connected to the rod body; the rod body is sleeved on the outside of the needle bearing.

7. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 6, characterized in that: The rod body includes a pull rod with one end sleeved on the outside of the needle bearing, and a driven rod connected to the end of the pull rod close to the needle bearing and with axes parallel to each other; the roller is arranged at the end of the driven rod away from the pull rod; the length of the pull rod is greater than the length between the roller and the needle bearing.

8. The DC field circuit breaker tripping device of the excitation system of a large generator set according to claim 1, characterized in that: The elastic reset assembly includes an articulated seat installed on the side of the release fork assembly away from the lock fork, a guide shaft connected to the articulated seat and rotating around the X-axis direction, a spring sleeved on the outside of the guide shaft, a limit plate sleeved on the outside of the guide shaft and connected to the spring away from the release fork assembly, and a limit shaft arranged along the X-axis direction and plugged into one end of the guide shaft away from the lock fork; a U-shaped socket used in conjunction with the limit shaft is arranged on the guide shaft.

9. A DC field circuit breaker tripping device for a large generator set excitation system according to claim 1, characterized in that: The fixing components are in two groups and close to each other to form a chamber, and the elastic reset component is installed in the chamber; An installation groove for installing a trip rod assembly and communicating with the chamber is formed between the fixing assembly and the base; a U-shaped groove communicating with the installation groove and used for installing a trip fork assembly is provided on the base; the installation groove and the U-shaped groove are provided on a side close to the lock fork; the U-shaped grooves are located directly above the chamber and are communicated with each other.

10. A method for using a DC field circuit breaker tripping device of a large generator set excitation system according to any one of claims 1 to 9, characterized in that: The specific steps include: When the DC magnetic field circuit breaker is opened, the trip rod assembly is controlled to rotate around the Z-axis direction to drive the trip fork assembly to rotate around the X-axis direction, so that the trip fork assembly contacts the top surface of the lock fork and exerts a force on the trip fork assembly to rotate downward around the X-axis direction. At the same time, the elastic reset assembly changes from the initial state to the compressed state, and the opening is completed; After the opening is completed, the trip fork assembly is reset under the elastic force of the elastic reset assembly and waits for the next opening.

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