Flexible DC power distribution network fault diagnosis and isolation system

Abstract

The utility model relates to the technical field of fault isolation, in particular to a fault diagnosis and isolation system for a flexible direct current power distribution network, which comprises a communication mechanism, an isolation mechanism, a reset mechanism and a detection and analysis mechanism, and is characterized in that a detection and analysis unit monitors the specific condition of a circuit in real time and determines whether the circuit runs normally based on detected data; and the isolation mechanism and the reset mechanism are controlled to operate, so that connection and closing of the circuit are completed in time, and the cutting speed of an abnormal circuit is increased.

Description

Technical Field

[0001] This utility model relates to the field of fault isolation technology, and in particular to a fault diagnosis and isolation system for flexible DC distribution networks. Background Technology

[0002] To ensure timely section isolation in the event of a fault, disconnecting switches are an indispensable and important component of flexible DC distribution networks. Disconnecting switches can be installed at the inlet and outlet of converters in flexible DC distribution networks to isolate the converters for inspection and maintenance.

[0003] Disconnect switches can be installed at the sectioning points of DC lines to divide the DC lines into different sections, facilitating section isolation in case of faults.

[0004] Disconnecting switches can be installed at the connection between the DC bus and the branch, such as at the branch connecting the DC load or energy storage device.

[0005] Disconnecting switches can be installed at the connection point between the DC distribution network and the AC power grid to isolate the DC distribution network from the AC power grid.

[0006] Chinese Patent Publication No. CN215896234U discloses a disconnecting switch for 110kV power grid to prevent accidental grounding. It includes two post insulators, each with a mounting plate fixed to its bottom. A base connects the bottom ends of the two mounting plates. Each post insulator has a grounding contact fixed to its top, and a connecting contact is mounted on the top of each grounding contact. A fixing rod is fixed to one side of one connecting contact, and a gate rod is mounted to one side of the other connecting contact. A contact finger is fixed to the end of the gate rod away from the connecting contact. This invention, through the cooperation of a cylinder, channel, piston rod, and locking hole, can lock the contact finger within a locking plate, thus preventing contact finger movement and greatly improving the stability of the circuit connection. Simultaneously, it prevents the contact finger from entering the locking plate during disconnection, thereby avoiding accidental connection and significantly improving safety during use. However, the above technical solution has the following problem: it does not consider monitoring the circuit, affecting the disconnecting speed of the disconnecting switch. Utility Model Content

[0007] Therefore, this utility model provides a flexible DC distribution network fault diagnosis and isolation system to overcome the problem that the prior art does not consider monitoring the circuit, which affects the disconnection speed of the disconnecting switch.

[0008] To achieve the above objectives, this utility model provides a flexible DC distribution network fault diagnosis and isolation system, comprising:

[0009] A connecting mechanism includes a base, fixed contacts and opening / closing contacts disposed on one side of the base for providing conductive contact, and contact blades for cooperating with each contact to connect and disconnect the circuit.

[0010] An isolation mechanism for controlling the disconnection of the contact blade from the opening and closing contact includes a limiting unit disposed at the middle of the base to limit the movement path of the contact blade and a driving unit disposed on one side of the base to drive the movement of the contact blade.

[0011] A reset mechanism is used to control the operation of the contact blade to complete the connection with the opening and closing contact.

[0012] The detection and analysis mechanism, which is connected to the contact blade, includes a temperature detector for detecting temperature, a voltage and current probe for detecting voltage and current, and a logic component for controlling the contact blade to be turned on or off based on the detected data.

[0013] Furthermore, the reset mechanism includes:

[0014] Several insulating supports are provided, each of which is located on the side of the contact blade near the base to isolate the current in the contact blade;

[0015] Several iron blocks are synergistically adsorbed, and each iron block is connected to an insulating support.

[0016] Several adsorption electromagnetic modules are arranged above the base to adsorb the co-adsorbed iron blocks when energized, and each adsorption electromagnetic module is correspondingly arranged with each co-adsorbed iron block.

[0017] Furthermore, the fixed contact includes:

[0018] A guide post, located above the fixed contact, is used to limit the movement trajectory of the contact blade.

[0019] Furthermore, the fixed contact also includes:

[0020] The limiting end, located at the top of the guide post, is used to control the range of movement of the contact blade.

[0021] Furthermore, the limiting unit includes:

[0022] Several constraint posts, one end of each constraint post being connected to the base, are used to restrict the movement path of the contact blade;

[0023] A constraint rod is disposed at the end of each constraint post away from the base to control the range of movement of the contact blade.

[0024] Furthermore, the limiting unit also includes:

[0025] Several isolation springs are provided, each of which is sleeved on each of the constraint posts, to spring open the contact blade during the operation of the drive unit, thereby disconnecting the contact blade from the opening and closing contacts.

[0026] Furthermore, the blade includes:

[0027] Several limiting holes are provided, each of which passes through the guide post and each of the constraint posts.

[0028] Further, the driving unit includes:

[0029] The locking module is used to secure the contact blade.

[0030] A slide rail, which is located above the base and connected to the locking module, is used to restrict the movement trajectory of the locking module.

[0031] Furthermore, the driving unit further includes:

[0032] A co-driven iron block is positioned on the side of the locking module away from the contact blade;

[0033] A drive electromagnetic module, which is located above the base, is used to attract the co-drive iron block when energized, so as to control the movement of the locking module.

[0034] Furthermore, the locking module includes:

[0035] A locking tongue, used to restrict the movement of the contact blade;

[0036] A sliding block, located below the latch and connected to the slide rail, is used to control the movement of the latch.

[0037] Compared with the prior art, the beneficial effect of this utility model is that the detection and analysis unit monitors the specific condition of the circuit in real time, determines whether the circuit is operating normally based on the detection data, and controls the operation of the isolation mechanism and the reset mechanism to complete the connection and closure of the circuit in a timely manner, effectively improving the disconnection speed for abnormal circuits.

[0038] Furthermore, by limiting the device at the top of the guide post, the contact blade of the mating moving part is prevented from exceeding the predetermined stroke range, thus avoiding damage to the disconnecting switch due to excessive movement and making it difficult to complete the subsequent reset action. This allows the connecting mechanism to be repeatedly opened and closed, improving the service life of the connecting mechanism. By setting the guide post, it is ensured that the contact blade can accurately reach the predetermined position during the reset action of the reset mechanism, completing the precise closure of the opening and closing contacts, effectively improving the closing accuracy of the disconnecting switch and further improving the stability of the closed switch operation.

[0039] Furthermore, by setting several isolation springs, the contact blade can be automatically disconnected when the drive unit releases the restriction on the contact blade, effectively improving the circuit disconnection efficiency.

[0040] Furthermore, by setting a reset mechanism to control the operation of the contact blade, the reset mechanism drives the contact blade to close with the opening and closing contacts, realizing the automatic connection and closure of the disconnect switch, which effectively improves the connection speed of the circuit.

[0041] Furthermore, by setting up a driving unit, the contact blade can be restricted and released. When the circuit is operating normally, the contact blade is restricted to ensure close contact with the opening and closing contacts, thereby improving the stability of the circuit operation. When the circuit is operating abnormally, the contact blade is released to disconnect from the opening and closing contacts and break the circuit, effectively improving the circuit disconnection efficiency. Attached Figure Description

[0042] Figure 1 This is a block diagram of the flexible DC distribution network fault diagnosis and isolation system according to an embodiment of the present invention;

[0043] Figure 2 This is a structural diagram of the flexible DC distribution network fault diagnosis and isolation system of this utility model when disconnected;

[0044] Figure 3 This is a structural diagram of the flexible DC distribution network fault diagnosis and isolation system according to an embodiment of the present invention under the connected condition;

[0045] Figure 4 This is a cross-sectional view of the flexible DC distribution network fault diagnosis and isolation system according to an embodiment of the present invention;

[0046] In the diagram: 11. Base; 12. Fixed contact; 121. Guide post; 122. Limiting end; 13. Opening / closing contact; 14. Contact knife; 141. Limiting hole; 211. Constraint post; 212. Isolation spring; 213. Constraint rod; 311. Locking tongue; 312. Sliding block; 32. Locking spring; 33. Slide rail; 34. Driving electromagnetic module; 35. Cooperative driving iron block; 41. Insulating bracket; 42. Adsorption electromagnetic module; 43. Cooperative adsorption iron block; 5. Detection and analysis mechanism. Detailed Implementation

[0047] To make the objectives and advantages of this utility model clearer, the utility model will be further described below with reference to the embodiments; it should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0048] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0049] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0050] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Please see Figure 1 The diagram shown is a block diagram of a flexible DC distribution network fault diagnosis and isolation system according to an embodiment of this utility model. The flexible DC distribution network fault diagnosis and isolation system includes a connecting mechanism, an isolation mechanism, a reset mechanism, and a detection and analysis mechanism 5. The connecting mechanism is used to connect and disconnect the circuit; the isolation mechanism is connected to the connecting mechanism to control the disconnection of the connecting mechanism; the reset mechanism is connected to the connecting mechanism to control the connection of the connecting mechanism; the detection and analysis mechanism 5 is connected to the connecting mechanism to detect circuit data and, based on the detected data, controls the operation of the isolation mechanism and the reset mechanism to control the connection or disconnection of the connecting mechanism.

[0052] When the flexible DC distribution network fault diagnosis and isolation system of this utility model is running, the connecting mechanism is in the connected state, the detection and analysis mechanism 5 detects the data of the circuit, and when the detection and analysis mechanism 5 determines that the circuit is abnormal based on the detected data, the isolation mechanism operates and the connecting mechanism is disconnected; after completing the processing of the circuit, when the detection and analysis mechanism 5 receives the instruction that the circuit is running normally, the reset mechanism operates and the connecting mechanism is connected.

[0053] Specifically, there is no limitation on the specific method for determining whether the circuit is operating normally based on the detected data. It is possible to determine whether there are abnormal electrical signal fluctuations in the circuit based on the detected electrical data, and then determine whether the circuit is operating normally based on the fluctuation situation. Alternatively, it is possible to determine whether there are abnormal voltages or abnormal currents in the detected data to further determine whether the circuit is operating normally. This will not be elaborated further.

[0054] Specifically, the detection and analysis module also includes a communication module (not shown in the figure), which is used to receive instructions.

[0055] The detection and analysis unit monitors the circuit's condition in real time, determines whether the circuit is operating normally based on the detected data, and controls the isolation and reset mechanisms to promptly connect and close the circuit, effectively improving the speed of cutting off abnormal circuits.

[0056] Please see Figure 2 As shown, this is a structural diagram of the flexible DC distribution network fault diagnosis and isolation system of this utility model when disconnected. The connection mechanism of this utility model includes a base 11, a fixed contact 12, an opening and closing contact 13, and a contact blade 14. The fixed contact 12 and the opening and closing contact 13 are both fixed on the base 11, so as to realize the connection and disconnection of the circuit by connecting and disconnecting the contact blade 14 with the fixed contact 12 and the opening and closing contact 13.

[0057] When the isolation mechanism is running, the contact 14 is raised away from the closing contact 13. When the reset mechanism is running, the contact 14 is lowered to complete the closure with the opening and closing contact 13.

[0058] Specifically, the fixed contact 12 includes a guide post 121 and a limiting end 122. The guide post 121 is located above the fixed contact 12 and is used to limit the movement trajectory of the contact blade 14; the limiting end 122 is located on top of the guide post 121 and is used to control the movement range of the contact blade 14.

[0059] When the isolation mechanism is in operation, the contact blade 14 is raised and restricted by the guide post 121, rising along the guide post 121 to below the restriction end 122, thus completing the circuit disconnection.

[0060] By installing a limiting end 122 above the guide post 121, the moving part contact 14 that is coupled with it is prevented from exceeding the predetermined stroke range, avoiding damage to the disconnecting switch due to excessive movement, which would make it difficult to complete the subsequent reset action. This allows the connecting mechanism to be repeatedly connected and closed, improving the service life of the connecting mechanism. By setting the guide post 121, it is ensured that the contact 14 can accurately reach the predetermined position during the movement of the reset mechanism to complete the precise closure with the opening and closing contact 13, effectively improving the closing accuracy of the disconnecting switch and further improving the stability of the closed switch operation.

[0061] Specifically, the isolation mechanism includes a limiting unit and a driving unit. The limiting unit is disposed in the middle of the base 11 to restrict the movement path of the contact blade 14; the driving unit is disposed on one side of the base 11 to drive the contact blade 14 to move.

[0062] When the isolation mechanism is in operation, the drive unit drives the contact blade 14 to move, and the contact blade 14 is restricted to move along a predetermined trajectory by the limit unit and the guide post 121.

[0063] Specifically, the limiting unit includes a plurality of constraint posts 211, constraint rods 213, and a plurality of isolation springs 212. One end of each constraint post 211 is connected to the base 11 to limit the movement path of the contact blade 14; the constraint rod 213 is located at the end of each constraint post 211 away from the base 11 to control the range of movement of the contact blade 14; each isolation spring 212 is sleeved on each constraint post 211 to spring open the contact blade 14 during operation of the driving unit, thereby disconnecting the contact blade 14 from the opening / closing contact 13.

[0064] When the drive unit is running, the drive unit releases the restriction on the contact blade 14, the isolation spring 212 deforms and springs the contact blade 14 away, the contact blade 14 is restricted to move upward by the constraint post 211 until it moves to the constraint rod 213, and stops moving due to the constraint rod 213.

[0065] By setting several isolation springs 212, the contact 14 is automatically disconnected when the driving unit releases the restriction on the contact 14, which effectively improves the circuit disconnection efficiency.

[0066] Please see Figure 3 The diagram shown is a structural diagram of the flexible DC distribution network fault diagnosis and isolation system of this utility model in the connected state. The reset mechanism includes several insulating supports 41, several cooperating adsorption iron blocks 43, and several adsorption electromagnetic modules 42. Each insulating support 41 is disposed on the side of the contact 14 near the base 11 to isolate the current of the contact 14; each cooperating adsorption iron block 43 is connected to each insulating support 41; each adsorption electromagnetic module 42 is disposed above the base 11 to adsorb the cooperating adsorption iron block 43 when energized, and each adsorption electromagnetic module 42 is correspondingly disposed to each cooperating adsorption iron block 43.

[0067] When the reset mechanism is running, each adsorption electromagnetic module 42 is energized to generate magnetic force to adsorb the corresponding co-adsorption iron block 43. The co-adsorption iron block 43 drives the insulating support 41 and the contact blade 14 connected to the insulating support 41 to move downward to complete the closure of the contact blade 14 and the opening and closing contact 13. At the same time, the drive module of the isolation mechanism locks the contact blade 14.

[0068] The operation of the contact 14 is controlled by a reset mechanism. The reset mechanism drives the contact 14 to close with the opening and closing contact 13, realizing the automatic connection and closing of the disconnect switch, which effectively improves the connection speed of the circuit.

[0069] Please see Figure 4 As shown, it is a cross-sectional view of the flexible DC distribution network fault diagnosis and isolation system of this utility model embodiment. The contact knife 14 of this utility model includes a plurality of limiting holes 141; each limiting hole 141 passes through the guide post 121 and each of the constraint posts 211 respectively.

[0070] Specifically, the driving unit includes a locking module, a slide rail 33, a co-driving iron block 35, a driving electromagnetic module 34, and a locking spring 32. The locking module is located on one side of the base 11 to fix the contact blade 14; the slide rail 33, located above the base 11 and connected to the locking module, restricts the movement trajectory of the locking module; the co-driving iron block 35 is located on the side of the locking module away from the contact blade 14; the driving electromagnetic module 34 is located above the base 11 to attract the co-driving iron block 35 when energized, thereby controlling the movement of the locking module; and the locking spring 32 is located within the slide rail 33 to drive the locking module to reset when the driving electromagnetic module 34 is activated.

[0071] When the drive unit receives the instruction from the monitoring and analysis mechanism and starts running, the drive electromagnetic module 34 is energized to generate magnetism to attract the co-drive iron block 35. The co-drive iron block 35 drives the locking module to move along the slide rail 33 to remove the restriction on the contact knife 14. At this time, the contact knife 14 is lifted upward and disconnected from the opening and closing contact 13. The drive electromagnetic module 34 is de-energized and the locking module is reset.

[0072] By setting up a driving unit, the contact 14 can be restricted and released. When the circuit is running normally, the contact 14 is restricted to make close contact with the opening and closing contact 13, so as to improve the stability of the circuit operation. When the circuit is running abnormally, the contact 14 is released to disconnect the contact 14 from the opening and closing contact 13 to disconnect the circuit, which effectively improves the disconnection efficiency of the circuit.

[0073] Specifically, the locking module of this utility model includes a locking tongue 311 and a sliding block 312. The locking tongue 311 is located on one side of the contact blade 14 to restrict the movement of the contact blade 14; the sliding block 312 is located below the locking tongue 311 and is connected to the slide rail 33 to control the movement of the locking tongue 311.

[0074] When the circuit is closed, the locking tongue 311 restricts the contact 14 to achieve stable contact between the contact 14 and the opening / closing contact 13. When the isolation mechanism receives a circuit abnormality command, the sliding block 312 moves along the slide rail 33 to the side away from the contact 14, driving the locking tongue 311 away from the contact 14 to release the restriction on the contact 14.

[0075] Specifically, the detection and analysis mechanism 5 includes a temperature detector (not shown in the figure), a voltage and current probe (not shown in the figure), and a logic component (not shown in the figure). The temperature detector is used to detect the temperature of the contact 14, the voltage and current probes are used to detect the voltage and current, and the logic component is used to control the contact 14 to be turned on or off based on the detected data.

[0076] The various mechanisms work together to control the circuit, creating a disconnect point in case of circuit malfunction to ensure the safety of maintenance personnel and the normal maintenance of the circuit. When the isolation and reset mechanisms operate, they cause the contact 14 to open or close with the opening and closing contact 13. During closing, the contact 14 is in close contact with the contact, forming a good conductive path. During opening, the contact 14 separates from the contact, disconnecting the circuit.

[0077] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0078] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flexible DC distribution network fault diagnosis and isolation system, characterized in that, include: A connecting mechanism includes a base, fixed contacts and opening / closing contacts disposed on one side of the base for providing conductive contact, and contact blades for cooperating with each contact to connect and disconnect the circuit. An isolation mechanism for controlling the disconnection of the contact blade from the opening and closing contact includes a limiting unit disposed at the middle of the base to limit the movement path of the contact blade and a driving unit disposed on one side of the base to drive the movement of the contact blade. A reset mechanism is used to control the operation of the contact blade to complete the connection with the opening and closing contact. The detection and analysis mechanism, which is connected to the contact blade, includes a temperature detector for detecting temperature, a voltage and current probe for detecting voltage and current, and a logic component for controlling the contact blade to be turned on or off based on the detected data.

2. The flexible DC distribution network fault diagnosis and isolation system according to claim 1, characterized in that, The reset mechanism includes: Several insulating supports are provided, each of which is located on the side of the contact blade near the base to isolate the current in the contact blade; Several iron blocks are synergistically adsorbed, and each iron block is connected to an insulating support. Several adsorption electromagnetic modules are arranged above the base to adsorb the co-adsorbed iron blocks when energized, and each adsorption electromagnetic module is correspondingly arranged with each co-adsorbed iron block.

3. The flexible DC distribution network fault diagnosis and isolation system according to claim 2, characterized in that, The fixed contact includes: A guide post, located above the fixed contact, is used to limit the movement trajectory of the contact blade.

4. The flexible DC distribution network fault diagnosis and isolation system according to claim 3, characterized in that, The fixed contact also includes: The limiting end, located at the top of the guide post, is used to control the range of movement of the contact blade.

5. The flexible DC distribution network fault diagnosis and isolation system according to claim 4, characterized in that, The limiting unit includes: Several constraint posts, one end of each constraint post being connected to the base, are used to restrict the movement path of the contact blade; A constraint rod is disposed at the end of each constraint post away from the base to control the range of movement of the contact blade.

6. The flexible DC distribution network fault diagnosis and isolation system according to claim 5, characterized in that, The limiting unit further includes: Several isolation springs are provided, each of which is sleeved on each of the constraint posts, to spring open the contact blade during the operation of the drive unit, thereby disconnecting the contact blade from the opening and closing contacts.

7. The flexible DC distribution network fault diagnosis and isolation system according to claim 6, characterized in that, The blade includes: Several limiting holes are provided, each of which passes through the guide post and each of the constraint posts.

8. The flexible DC distribution network fault diagnosis and isolation system according to claim 7, characterized in that, The driving unit includes: Locking module, used to secure the contact blade; A slide rail, which is located above the base and connected to the locking module, is used to restrict the movement trajectory of the locking module.

9. The flexible DC distribution network fault diagnosis and isolation system according to claim 8, characterized in that, The drive unit further includes: A co-driven iron block is positioned on the side of the locking module away from the contact blade; A drive electromagnetic module, which is located above the base, is used to attract the co-drive iron block when energized, so as to control the movement of the locking module.

10. The flexible DC distribution network fault diagnosis and isolation system according to claim 9, characterized in that, The locking module includes: A locking tongue, used to restrict the movement of the contact blade; A sliding block, located below the latch and connected to the slide rail, is used to control the movement of the latch.

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