Locking structure and transformer neutral point grounding switch switching device

Abstract

The utility model relates to the technical field of power system relay protection, in particular to a locking structure and a transformer neutral point grounding knife switch switching device, which comprise a locking unit, the locking unit comprises an insulating connecting rod, a magnetic connecting plate and a driving electromagnet, one end of the insulating connecting rod is provided with the magnetic connecting plate, and the other end of the insulating connecting rod is provided with the driving electromagnet. A driving electromagnet is arranged on the side, away from the insulating connecting rod, of the magnetic connecting plate, a locking unit connected with a circuit is adopted for protection, when the switch is not grounded, due to the fact that the switch is still in a power-on state, a locking structure can be pushed out, a disconnecting link cannot be closed, and all modules cooperate with one another, so that the safety of the switch is improved. By judging the real-time operation state of the transformer, combining the operation mode of the main transformer and formulating the grounding knife switch switching logic of the transformer neutral point of the whole station, the unsafe factors of manual closing when the transformer and the system have faults are reduced, and meanwhile, the bus zero-sequence locking grounding knife switch switching measure is introduced, so that no matter in manual closing or intelligent closing, the safety of the system is improved. And the safety of operators can be better guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of relay protection of electric power systems, in particular to a locking structure and a transformer neutral point grounding switch device. Background Art

[0002] For substations with voltage levels above 110kV in the power system, changes in the number of transformer neutral point grounding will lead to changes in the zero-sequence network of the power grid, which will directly affect the size and distribution of the zero-sequence current, making the setting calculation of the zero-sequence overcurrent protection extremely difficult, and greatly reducing the adaptability of the zero-sequence overcurrent protection. Therefore, in the national and relevant power industry standards, it is clearly stipulated that the basic principle of keeping the zero-sequence network of the power grid basically unchanged is required. For substations equipped with two transformers, the neutral point of one transformer is usually directly grounded, while the neutral point of the other transformer is grounded through a gap. When the directly grounded transformer is shut down, the neutral point grounding knife switch of the gap-grounded transformer is closed, and the neutral point is changed to direct grounding, thereby achieving the overall requirement that the zero-sequence network of the power grid remains basically unchanged.

[0003] At present, the opening and closing operations of the transformer neutral point grounding switch are all manually performed by the substation duty personnel, and the timeliness cannot be guaranteed. If a fault occurs during manual operation, it will pose a threat to the personal safety of the duty personnel, and the switch status cannot be identified, affecting the switching effect. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the problem mentioned above or in the prior art that it is impossible to identify whether a switch is in a grounding state, the present utility model is proposed.

[0006] Therefore, an object of the present invention is to provide a locking structure.

[0007] In order to solve the technical problem that the above-mentioned prior art cannot identify whether the switch is in a grounding state, the utility model provides the following technical solution: a locking structure, comprising:

[0008] The locking unit comprises an insulating connecting rod, a magnetic connecting plate and a driving electromagnet. One end of the insulating connecting rod is provided with a magnetic connecting plate, and a side of the magnetic connecting plate away from the insulating connecting rod is provided with a driving electromagnet.

[0009] As a preferred solution of the locking structure of the utility model, wherein: the insulating connecting rod includes a positioning sleeve, a pushing connecting plate, a limiting connecting block and an insulating back plate, the insulating connecting rod is provided with a positioning sleeve, the insulating connecting rod is connected to the magnetic connecting plate through the pushing connecting plate, a limiting connecting block is provided on the outer side of the pushing connecting plate, and an insulating back plate is provided between the pushing connecting plate and the magnetic connecting plate.

[0010] As a preferred solution of the locking structure of the utility model, wherein: a guide block is arranged on the insulating back plate, the locking unit also includes a motion slot, a locking link and a connecting plate, a motion slot is opened in the locking unit, a locking link is arranged in the motion slot, a limiting block is arranged at one end of the locking link, a reset spring is arranged on the limiting block, and a connecting plate is arranged on the motion slot.

[0011] As a preferred solution of the locking structure of the utility model, wherein: the motion slot includes a rotating bracket and a linkage arm, the rotating bracket is provided with a linkage arm, the linkage arm is movably connected to the rotating bracket through a rotating shaft, and the linkage arm is provided with a connecting shaft.

[0012] As a preferred solution of the locking structure of the utility model, wherein: the linkage arm is movably connected to a lifting link via a connecting shaft, a fixed link is also provided on the linkage arm via a connecting shaft, and a fixed blind hole is reserved on the fixed link.

[0013] As a preferred solution of the locking structure of the utility model, wherein: a connecting spring is arranged at one end of the connecting plate, a guiding block is arranged on the connecting plate, and the position of the connecting plate corresponds to the position of the limiting block.

[0014] Beneficial effects of the locking structure of the utility model:

[0015] A locking unit interconnected with the line is used for protection. When the switch is not grounded, since the switch is still powered on, the locking structure will be pushed out, making it impossible to close the knife switch, thereby failing to complete the switching work, prompting the staff that there is a problem with the equipment so that the transformer can be switched better.

[0016] Given that in actual use, there is still the problem that the timeliness of manual operation cannot be guaranteed and will pose a threat to personal safety.

[0017] In order to solve the technical problem that the timeliness of the above-mentioned manual operation cannot be guaranteed and will pose a threat to personal safety, the utility model also provides the following technical solutions: a transformer neutral point grounding knife switching device, a switching switch, a locking unit is arranged on the switching switch, the switching switch includes a rotating seat, a power connection spring and a knife switch connecting rod, the switching switch is provided with a rotating seat and a power connection spring, and the rotating seat is provided with a knife switch connecting rod.

[0018] As a preferred solution of the transformer neutral point grounding knife switching device of the utility model, the knife switch connecting rod includes a linkage base, a linkage rotating shaft and a linkage connecting rod, the knife switch connecting rod is provided with a linkage base, the linkage base is provided with a linkage rotating shaft, and the linkage rotating shaft is provided with a linkage connecting rod.

[0019] As a preferred solution of the transformer neutral point earth switch switching device of the utility model, wherein: a driving motor is arranged at one end of the linkage connecting rod, a driving shaft is arranged on the driving motor, a driving turntable is arranged on the driving shaft, the driving turntable is connected to the linkage connecting rod through a connecting rod, and the switching switch is provided with a guide slot, the structure of the guide slot is the same as that of the guide block, and the sizes are adapted to each other.

[0020] As a preferred solution of the transformer neutral point earth switch switching device of the utility model, wherein: the driving motor is connected with a relay protector, the relay protector includes a CPU module, an intelligent acquisition module, an AC sampling module and a power supply module, the power supply module model is WB7611, the CPU module model is WB7270, the intelligent acquisition module model is SR7851, the AC sampling module model is WB7112, the CPU module, the intelligent acquisition module, the AC sampling module and the power supply module are arranged in a chassis, and the width×height×depth of the chassis is: 186.8mm*271mm*209.7mm.

[0021] Beneficial effects of the transformer neutral point grounding switch device of the utility model:

[0022] By adopting division of labor and cooperation among various modules, the real-time operating status of the transformer is judged, and combined with the operating mode of the main transformer, the neutral point earthing switch switching logic of the entire station transformer is formulated, which reduces the unsafe factors of manual closing when the transformer and system fail. At the same time, the busbar zero-sequence locked earthing switch switching measure is introduced, which can better protect the safety of operators whether in manual closing or intelligent closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 Schematic diagram of the internal structure of the shielding case;

[0026] Figure 3 It is a schematic diagram of the overall structure of the insulating connecting rod;

[0027] Figure 4 is a schematic diagram of the internal structure of the locking unit;

[0028] Figure 5 It is a schematic diagram of the motion state of pushing the connecting plate;

[0029] Figure 6 A schematic diagram of the connection structure between the guide card block and the guide card slot;

[0030] Figure 7 It is a structural block diagram of the utility model. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0034] Example 1

[0035] Reference Figure 1-2, which is the first embodiment of the utility model, and the embodiment provides a locking structure, which produces the effect, including a locking unit 100, the locking unit 100 includes an insulating connecting rod 101, a magnetic connecting plate 103 and a driving electromagnetic 104, one end of the insulating connecting rod 101 is provided with a magnetic connecting plate 103, and the side of the magnetic connecting plate 103 away from the insulating connecting rod 101 is provided with a driving electromagnetic 104, and the knife switch is blocked and stopped by setting the locking unit 100, and cannot be closed when the switch is energized, thereby helping the staff to identify the power-on status of the transformer and improving the accuracy of the device when switching;

[0036] The switching switch 200 is provided with a locking unit 100, and the switching switch 200 includes a rotating seat 203, an electric spring 204 and a knife switch connecting rod 205. The switching switch 200 is provided with a rotating seat 203 and an electric spring 204, and a knife switch connecting rod 205 is provided on the rotating seat 203. The knife switch connecting rod 205 driven by a motor will drive the knife switch connecting rod 205 to move when the lower end motor is driven. No manual operation is required, and the opening and closing work can be performed by the drive of the motor.

[0037] During use, when the switching switch 200 is in a powered state, the internal driving structure of the locking unit 100 will push the insulating connecting rod 101 outward, and seal the entrance of the power-connecting spring piece 204 through the insulating connecting rod 101. When the device is started, the knife switch connecting rod 205 is driven downward by the driving motor 202 at the lower end. Due to the presence of the insulating connecting rod 101, the knife switch connecting rod 205 cannot contact the power-connecting spring piece 204, thereby failing to complete the switching work. When the switching switch 200 is in a grounded state, since the switching switch 200 itself is not powered, it cannot trigger the locking unit 100 to close the power-connecting spring piece 204, allowing the knife switch connecting rod 205 to connect and contact it, thereby forming a passage to complete the switching.

[0038] Example 2

[0039] Reference Figure 3 to Figure 5, which is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides a locking structure to solve the problem of being unable to identify whether the switch is in a grounded state. It includes an insulating connecting rod 101 including a positioning sleeve 101a, a pushing connecting plate 101b, a limiting connecting block 101c and an insulating back plate 101d. The insulating connecting rod 101 is provided with a positioning sleeve 101a. The insulating connecting rod 101 is connected to the magnetic connecting plate 103 through the pushing connecting plate 101b. The outer side of the pushing connecting plate 101b is provided with a limiting connecting block. 101c, an insulating back plate 101d is provided between the push connecting plate 101b and the magnetic connecting plate 103, and the magnetic connecting plate 103 cooperates with the driving electromagnet 104 to push the insulating connecting rod 101 to connect, so as to close the connecting spring 204, and at the same time, the insulating back plate 101d between the magnetic connecting plate 103 and the push connecting plate 101b prevents the locking unit 100 from being conductive when powered on, and the positioning sleeve 101a adapted to the structure of the insulating connecting rod 101 makes the connection of the insulating connecting rod 101 more stable;

[0040] Preferably, a guide block 102 is provided on the insulating back plate 101d, and the locking unit 100 further includes a motion slot 105, a locking link 106 and a connecting plate 107. A motion slot 105 is provided in the locking unit 100, and a locking link 106 is provided in the motion slot 105. A limit block 106a is provided at one end of the locking link 106, and a return spring 106b is provided on the limit block 106a. A connecting plate 107 is provided on the motion slot 105. The connecting plate 107 can provide buffering when the internal structure is driven by cooperating with the connecting plate 107 of the limit block 101c, and can cooperate with the connecting spring 107a connected to one end of the connecting plate 107 to push the insulating link 101 to move to both sides after power is removed, so as to facilitate the connection between the knife switch connecting rod 205 and the power-connecting spring 204.

[0041] Further, the motion slot 105 includes a rotating bracket 105a and a linkage arm 105b. The rotating bracket 105a is provided with a linkage arm 105b, which is movably connected to the rotating bracket 105a through a rotating shaft 105b-1. The linkage arm 105b is provided with a connecting shaft 105b-2. Through the linkage structure of the rotating bracket 105a, after the driving electromagnetic 104 pushes the insulating connecting rod 101 to move, when it moves to the position of the lifting connecting rod 105c, the linkage structure will be triggered to lock it, and it will be fixed in cooperation with the locking connecting rod 106;

[0042] Furthermore, the linkage arm 105b is movably connected to the lifting link 105c through the connecting shaft 105b-2. A fixed link 105d is also provided on the linkage arm 105b through the connecting shaft 105b-2. A fixed blind hole 105e is reserved on the fixed link 105d. The rotating bracket 105a is fixed by connecting the fixed blind hole 105e on the fixed link 105d with the limit block 106a. After the connection is released, the linkage arm 105b is reset by the torsion spring arranged on the outside of the rotating shaft 105b-1, and the limit block 101c is lifted up and reset in cooperation with the connecting spring 107a.

[0043] When in use, the driving electromagnet 104 will generate a magnetic force that repels the magnetic connecting plate 103 when energized. Under the action of the repulsive force, the pushing connecting plate 101b will be driven to move. When it moves, the limiting connecting block 101c will contact the connecting connecting plate 107 and squeeze the connecting spring 107a under the continuous movement of the connecting connecting plate 107, pushing the insulating connecting rod 101 outward, so that the insulating connecting rod 101 and the positioning sleeve 101a are connected to each other, thereby sealing the connecting spring 204. When the limiting connecting block 101c moves, it will also contact the lifting connecting rod 105c to make it move downward, thereby driving the linkage arm 105b to move, so that the fixed connecting rod 105d set at the other end of the linkage connecting arm 105b is in contact with the locking connecting rod 106, thereby completing the fixation of the linkage connecting arm 105b, making the connection of the insulating connecting rod 101 more stable.

[0044] Example 3

[0045] Reference Figure 2 and Figure 6-7 , which is the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides a solution to the problem that the timeliness of manual operation cannot be guaranteed and will pose a threat to personal safety. It includes a connecting spring 107a provided at one end of the connecting plate 107, a guide block 102 provided on the connecting plate 107, and the position of the connecting plate 107 corresponds to the position of the limit connecting block 101c. The knife switch connecting rod 205 includes a linkage base 205a, a linkage shaft 205b and a linkage connecting rod 205c. The knife switch connecting rod 205 is provided with a linkage base 205a, a linkage shaft 205b is provided on the linkage base 205a, and a linkage connecting rod 205c is provided on the linkage shaft 205b. The knife switch connecting rod 205 is driven to move downward by the linkage shaft 205b, thereby driving the knife switch connecting rod 205 and the power-connecting spring 204 to contact each other to form a passage.

[0046] Preferably, a driving motor 202 is provided at one end of the linkage connecting rod 205c, a driving shaft 202a is provided on the driving motor 202, a driving rotating disk 202b is provided on the driving rotating shaft 202a, and the driving rotating disk 202b is connected to the linkage connecting rod 205c through the connecting rod 202c. The driving rotating disk 202b is driven to rotate by the driving motor 202, and the linkage rotating shaft 205b is cooperated to open and close the switch;

[0047] Furthermore, the switch 200 is provided with a guide slot 206, the structure of the guide slot 206 is the same as that of the guide block 102, and the sizes are adapted to each other. Through the cooperation and connection between the guide slot 206 and the guide block 102, the internal motion structure can be driven more smoothly.

[0048] Furthermore, the driving motor 202 is connected with a relay protector, which includes a CPU module, an intelligent acquisition module, an AC sampling module and a power module. The power module model is WB7611, the CPU module model is WB7270, the intelligent acquisition module model is SR7851, and the AC sampling module model is WB7112. The CPU module, the intelligent acquisition module, the AC sampling module and the power module are arranged in a chassis. The width × height × depth of the chassis is: 186.8mm*271mm*209.7mm. The CPU module is connected to the AC sampling module, the intelligent acquisition module and the power module, and is used to perform logical judgment on the switch quantity information collected by the intelligent acquisition module and the voltage and current information collected by the AC sampling module and output the tripping outlet to the intelligent acquisition module;

[0049] The power module is connected to an external 110V / 220VDC power supply through the power terminal, and provides 5V power for the CPU module, intelligent acquisition module, and AC sampling module after conversion through the DC / DC switching power module to ensure the normal operation of the module. A man-machine operation module and a communication module are also provided. The intelligent acquisition module collects switching information including the neutral point grounding knife, the busbar interconnection switch position, and the circuit breaker position of the transformer. The AC quantity information collected by the AC sampling module is the bus voltage and zero-sequence voltage on the high-voltage side of the transformer, and the bus voltage and zero-sequence voltage on the medium-voltage side of the transformer.

[0050] When in use, after the driving motor 202 is started, it will drive the driving turntable 202b to rotate through the driving shaft 202a, and with the cooperation of the connecting rod 202c and the linkage rod 205c, it will drive the linkage rod 205c to move downward, and drive the knife switch linkage rod 205 to move downward through the linkage shaft 205b on the linkage base 205a, thereby realizing automatic opening and closing of the switch and better performing line switching work.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present utility model, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0052] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0053] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A locking structure, characterized in that: include, A locking unit (100) comprising an insulating connecting rod (101), a magnetic connecting plate (103) and a driving electromagnet (104); one end of the insulating connecting rod (101) is provided with a magnetic connecting plate (103); a side of the magnetic connecting plate (103) away from the insulating connecting rod (101) is provided with a driving electromagnet (104).

2. The locking structure according to claim 1, characterized in that: The insulating connecting rod (101) comprises a positioning sleeve (101a), a pushing connecting plate (101b), a limiting connecting block (101c) and an insulating back plate (101d); the insulating connecting rod (101) is provided with a positioning sleeve (101a); the insulating connecting rod (101) is connected to a magnetic connecting plate (103) via the pushing connecting plate (101b); a limiting connecting block (101c) is provided on the outer side of the pushing connecting plate (101b); and an insulating back plate (101d) is provided between the pushing connecting plate (101b) and the magnetic connecting plate (103).

3. The locking structure according to claim 2, characterized in that: The insulating back plate (101d) is provided with a guide block (102), and the locking unit (100) further comprises a moving slot (105), a locking link (106) and a connecting plate (107). The locking unit (100) is provided with a moving slot (105), a locking link (106) is provided in the moving slot (105), a limiting block (106a) is provided at one end of the locking link (106), a return spring (106b) is provided on the limiting block (106a), and a connecting plate (107) is provided on the moving slot (105).

4. The locking structure according to claim 3, characterized in that: The motion slot (105) comprises a rotating bracket (105a) and a linkage arm (105b); the rotating bracket (105a) is provided with a linkage arm (105b); the linkage arm (105b) is movably connected to the rotating bracket (105a) via a rotating shaft (105b-1); and the linkage arm (105b) is provided with a connecting shaft (105b-2).

5. The locking structure according to claim 4, characterized in that: The linkage arm (105b) is movably connected to a lifting link (105c) via a connecting shaft (105b-2); a fixed link (105d) is also provided on the linkage arm (105b) via a connecting shaft (105b-2); and a fixed blind hole (105e) is reserved on the fixed link (105d).

6. The locking structure according to claim 3, characterized in that: A connecting spring (107a) is provided at one end of the connecting plate (107), a guiding block (102) is provided on the connecting plate (107), and the position of the connecting plate (107) corresponds to the position of the limiting block (101c).

7. A transformer neutral point ground switch device, characterized in that: The invention comprises a locking structure as claimed in any one of claims 1 to 6, and a switching switch (200), wherein the switching switch (200) is provided with a locking unit (100), wherein the switching switch (200) comprises a rotating seat (203), an electric spring (204) and a knife switch connecting rod (205), wherein the switching switch (200) is provided with a rotating seat (203) and an electric spring (204), and wherein the knife switch connecting rod (205) is provided on the rotating seat (203).

8. The transformer neutral point ground switch device according to claim 7, characterized in that: The knife switch connecting rod (205) comprises a linkage base (205a), a linkage rotating shaft (205b) and a linkage connecting rod (205c); the knife switch connecting rod (205) is provided with a linkage base (205a), the linkage base (205a) is provided with a linkage rotating shaft (205b), and the linkage connecting rod (205c) is provided with the linkage rotating shaft (205b).

9. The transformer neutral point ground switch device according to claim 8, characterized in that: A driving motor (202) is provided at one end of the linkage connecting rod (205c), a driving shaft (202a) is provided on the driving motor (202), a driving rotating disk (202b) is provided on the driving rotating shaft (202a), the driving rotating disk (202b) is connected to the linkage connecting rod (205c) via a connecting connecting rod (202c), and the switching switch (200) is provided with a guide slot (206), the structure of the guide slot (206) is the same as that of the guide block (102), and the sizes are adapted to each other.

10. The transformer neutral point ground switch device according to claim 9, characterized in that: The drive motor (202) is connected to a relay protector, the relay protector comprising a CPU module, an intelligent acquisition module, an AC sampling module and a power module, the power module model is WB7611, the CPU module model is WB7270, the intelligent acquisition module model is SR7851, the AC sampling module model is WB7112, the CPU module, the intelligent acquisition module, the AC sampling module and the power module are arranged in a chassis, and the width×height×depth of the chassis is: 186.8mm*271mm*209.7mm.

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