Split type direct current feeder line maintenance terminal

Abstract

The invention discloses a split type direct current feeder line maintenance terminal which comprises a terminal shell and a terminal assembly movably connected with the end portion of the terminal shell. The terminal assembly comprises at least two groups of terminal pins, and the end parts of two adjacent groups of terminal pins are in contact through movable connection; each group of terminal pins is provided with a main binding post and an auxiliary binding post; the auxiliary binding post is connected to a standby power supply, then the two groups of terminal pins are separated, live replacement of the terminal can be realized, the two groups of terminal pins are movably connected, and the main binding post and the auxiliary binding post are arranged on the terminal pins, so that direct-current load voltage loss cannot be caused when a maintainer transfers a load, and the maintenance efficiency is improved. Meanwhile, the maintenance terminal is convenient to disassemble and assemble, so that the voltage loss of the direct-current feeder line and the insulation damage of the secondary cable caused by load transfer are eliminated; and meanwhile, the feeder line with direct current grounding can be effectively isolated, so that a direct current system quickly returns to normal, and the direct current voltage of other feeder lines is ensured to be normal without influencing the operation.

Description

Technical Field

[0001] The invention relates to the technical field of terminals, in particular to a split type DC feeder maintenance terminal. Background Art

[0002] Currently, the feeder terminals of the DC power supply systems in existing and newly built substations all use conventional secondary terminals. During the transformation process, the load transfer of the feeder must be carried out under power. To prevent power outages, there are only two solutions for DC feeder load transfer:

[0003] The first method is to use an external cable to connect the power supply to the power supply in the main control room cabinet. This method requires a high level of technical skills of on-site maintenance personnel and involves the power supply circuit of other professionals, which requires the cooperation of relevant professionals to complete. This method poses a threat to the stable operation of the equipment.

[0004] The second method involves damaging the insulation layer of DC feeder cables, exposing the metal parts before paralleling. If the parallel connection is not secure, it can easily cause DC load voltage loss. Furthermore, the insulation layer of these cables may already be damaged after the load transfer is complete. This can easily lead to DC short circuits or grounding in the DC system feeder due to reduced insulation capacity, thus disrupting the stable operation of the power grid.

[0005] Because the DC feeder power supplies within the station all use conventional secondary terminals, when a DC feeder grounding occurs, the entire DC system will remain grounded until the DC grounding fault is resolved. If two-point grounding occurs at this time, it is very likely to cause the protection device to fail to operate or malfunction. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that: when a DC feeder grounding occurs in the existing secondary terminal, the entire DC system will remain in a grounded state before the DC grounding fault is resolved. If two-point grounding occurs at this time, it is very likely to cause the protection device to fail to operate or malfunction.

[0007] The above technical problems are solved by the following technical solution: The present invention proposes a split DC feeder maintenance terminal, which includes a terminal shell and a terminal assembly movably connected to the end of the terminal shell; the terminal assembly includes at least two groups of terminal pins, and the ends of two adjacent groups of terminal pins are in contact through a movable connection; each group of terminal pins is provided with a main terminal and an auxiliary terminal; by connecting the auxiliary terminal to a backup power supply and then separating the two groups of terminal pins, the terminal can be replaced under power.

[0008] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the cable and terminal pins inserted into the main terminal can form a feeder branch; connecting the auxiliary terminal to a backup power supply and then separating the two groups of terminal pins can achieve isolation of the feeder branch.

[0009] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the terminal assembly is connected to the end of the terminal shell via a connecting assembly.

[0010] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the connecting assembly includes a fixing bolt and a wire-pressing bolt, the fixing bolt is used to fix the terminal pin to the end of the terminal shell, and the wire-pressing bolt is used to fix the cable in the main terminal.

[0011] In a preferred embodiment of the split DC feeder maintenance terminal of the present invention: the terminal shell end is provided with a first threaded hole, the number of the first threaded holes is the same as the number of the fixing bolts; the first threaded holes are adapted to the fixing bolts.

[0012] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: two adjacent groups of terminal pins are respectively a first terminal pin and a second terminal pin, the end of the first terminal pin close to the second terminal pin is a first connection end, and the end of the second terminal pin close to the first terminal pin is a second connection end.

[0013] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the first connecting end is provided with a first connecting through hole, and the second connecting end is provided with a second connecting through hole; when the first connecting through hole and the second connecting through hole are connected, a connecting bolt passes through the first connecting through hole and the second connecting through hole at the same time and is threadedly connected to the connecting threaded hole at the end of the terminal shell.

[0014] In a preferred embodiment of the split DC feeder maintenance terminal of the present invention: the first connecting end is provided with a clamping block, and the second connecting end is provided with a clamping slot; the clamping block is adapted to the clamping slot.

[0015] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the clamping block is linear, and a clamping block is provided on the end face of the clamping block; the clamping groove is linear, and when the clamping block is fully inserted into the clamping groove, the clamping block is engaged with the clamping groove on the inner wall of the clamping groove.

[0016] In a preferred embodiment of the split-type DC feeder maintenance terminal of the present invention: the clamping block is bent, and a clamping block is provided on the end face of the clamping block; the shape of the inner wall of the clamping groove is adapted to the clamping block, and when the clamping block is fully inserted into the clamping slot, the clamping block is engaged with the clamping groove on the inner wall of the clamping slot.

[0017] The beneficial effect of the present invention is that by movably connecting the two groups of terminal pins and arranging main terminals and auxiliary terminals on the terminal pins, when the terminal pins need to be replaced under power during maintenance, the auxiliary terminals can be connected to a backup power supply, and then the two groups of terminal pins can be separated, and the separated terminal pins can be inserted into a new terminal block.

[0018] By flexibly connecting the two sets of terminal pins and providing main and auxiliary terminals on the terminal pins, maintenance personnel can avoid DC load voltage loss during load transfer. At the same time, the easy-to-remove and install maintenance terminals facilitate on-site operations for maintenance personnel, eliminating DC feeder voltage loss and secondary cable insulation damage caused by load transfer.

[0019] At the same time, it can effectively isolate the feeder where DC grounding occurs, allowing the DC system to quickly return to normal and ensuring that the DC voltage of other feeders is normal without affecting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0021] Figure 1 Shows the steps for live replacement of split-type DC feeder maintenance terminals Figure 1 ;

[0022] Figure 2 Shows the steps for live replacement of split-type DC feeder maintenance terminals Figure 2 ;

[0023] Figure 3 Shows the steps for live replacement of split-type DC feeder maintenance terminals Figure 3 ;

[0024] Figure 4 Shows the steps for live replacement of split-type DC feeder maintenance terminals Figure 4 ;

[0025] Figure 5 Shows the steps for live replacement of split-type DC feeder maintenance terminals Figure 5 ;

[0026] Figure 6 A schematic diagram of the terminal pins of the split-type DC feeder maintenance terminal is shown.

[0027] In the figure: 1. Terminal shell; 2. Terminal assembly; 21. First terminal pin; 22. Second terminal pin; 23. First connection end; 24. Second connection end; 25. Clamping block; 26. Clamping block; 3. Main terminal; 4. Auxiliary terminal; 5. Backup power supply; 6. Connection assembly; 61. Fixing bolt; 62. Wire-pressing bolt; 63. Connection bolt. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0029] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0030] Reference Figure 1 , this embodiment provides a split type DC feeder maintenance terminal, comprising a terminal shell 1, and a terminal assembly 2 movably connected to the end of the terminal shell 1;

[0031] The terminal assembly 2 includes at least two groups of terminal pins, and the ends of two adjacent groups of terminal pins are in contact through a movable connection;

[0032] Each set of terminal pins is provided with a main terminal 3 and an auxiliary terminal 4;

[0033] The terminals can be replaced under power by connecting the auxiliary terminal 4 to the backup power supply 5 and then separating the two groups of terminal pins.

[0034] The cables and terminal pins inserted into the main terminal 3 can form a feeder branch; connecting the auxiliary terminal 4 to the backup power supply 5 and then separating the two groups of terminal pins can achieve isolation of the feeder branch.

[0035] It should be noted that the load transfer of the feeder must be energized during the transformation of the existing secondary terminals. In order to prevent power outages, there are only two solutions for DC feeder load transfer: the first method is to use an external cable to connect the external power supply to the power supply in the main control room panel cabinet. This method requires a high level of skill and technical expertise for on-site maintenance personnel, and involves power circuits from other professions, which requires cooperation from relevant professionals. This method poses a threat to the stable operation of the equipment.

[0036] The second method involves damaging the insulation layer of DC feeder cables, exposing the metal parts before paralleling. If the parallel connection is not secure, it can easily cause DC load voltage loss. Furthermore, the insulation layer of these cables may already be damaged after the load transfer is complete. This can easily lead to DC short circuits or grounding in the DC system feeder due to reduced insulation capacity, thus disrupting the stable operation of the power grid.

[0037] Because the DC feeder power supplies within the station all use conventional secondary terminals, when a DC feeder grounding occurs, the entire DC system will remain grounded until the DC grounding fault is resolved. If two-point grounding occurs at this time, it is very likely to cause the protection device to fail to operate or malfunction.

[0038] The maintenance terminal in our invention is achieved by movably connecting two groups of terminal pins and setting main terminals 3 and auxiliary terminals 4 on the terminal pins. When the terminal pins need to be replaced under power on the maintenance terminal, the auxiliary terminals 4 can be connected to the backup power supply 5, and then the two groups of terminal pins can be separated and the separated terminal pins can be inserted into the new terminal block.

[0039] Our invention is a maintenance terminal that can be connected to an external power supply without damaging the insulation layer, making it easier for maintenance personnel to transfer the load without causing DC load voltage loss. At the same time, the maintenance terminal is easy to disassemble and install, making it easier for maintenance personnel to perform on-site operations and eliminating DC feeder voltage loss and secondary cable insulation damage caused by load transfer.

[0040] Moreover, the maintenance terminal in our invention can be connected to an external mobile power supply to effectively isolate the feeder with DC grounding, allowing the DC system to quickly return to normal and ensuring that the DC voltage of other feeders is normal without affecting operation.

[0041] In some embodiments, the terminal assembly 2 is connected to the end of the terminal shell 1 through a connecting assembly 6; the connecting assembly 6 includes a fixing bolt 61 and a wire-pressing bolt 62, the fixing bolt 61 is used to fix the terminal pin to the end of the terminal shell 1, and the wire-pressing bolt 62 is used to fix the cable in the main terminal 3.

[0042] Specifically, the end of the terminal housing 1 is provided with first threaded holes, and the number of the first threaded holes is the same as the number of the fixing bolts 61 ; the first threaded holes are adapted to the fixing bolts 61 .

[0043] Furthermore, the two adjacent groups of terminal needles are respectively the first terminal needle 21 and the second terminal needle 22 , the end of the first terminal needle 21 close to the second terminal needle 22 is the first connection end 23 , and the end of the second terminal needle 22 close to the first terminal needle 21 is the second connection end 24 .

[0044] Furthermore, the first connection end 23 is provided with a first connection through hole, and the second connection end 24 is provided with a second connection through hole;

[0045] When the first connecting through hole and the second connecting through hole are connected, the connecting bolt passes through the first connecting through hole and the second connecting through hole at the same time and is threadedly connected to the connecting threaded hole at the end of the terminal housing 1 .

[0046] Operation: The maintenance terminal in our invention consists of a terminal assembly 2 and a terminal housing 1. The terminal assembly 2 is formed by connecting at least two terminal pins. The first connection end 23 of the first terminal pin 21 and the second connection end 24 of the second terminal pin 22 are simultaneously inserted into the first and second connection through-holes by connecting bolts and threadedly connected to the connection threaded holes on the end surface of the terminal housing 1. Each terminal pin is provided with a main terminal 3 and an auxiliary terminal 4. The main terminal 3 is used to connect cables, and the auxiliary terminal 4 is used to connect test or backup power supply 5.

[0047] When the terminal pin of the maintenance terminal needs to be replaced under power, first, connect the backup power to the auxiliary terminal 4 of the terminal to be replaced; then remove the connecting nut, and the first connecting end 23 of the first terminal pin 21 and the second connecting end 24 of the second terminal pin 22 can be separated; unscrew the fixing bolt 61 connecting the terminal pin to be replaced and the terminal shell 1, pull the terminal pin to be replaced out of the old maintenance terminal shell 1, and insert it into the new maintenance terminal shell 1, fix the two terminal pins with the connecting bolts, draw the backup power, and finally complete the live replacement of the maintenance terminal and isolate the feeder branch.

[0048] During the maintenance process, maintenance personnel can easily connect to the backup power supply 5 and perform corresponding operations to effectively isolate the DC feeder branch, thereby avoiding unstable grid operation caused by reasons such as DC feeder grounding.

[0049] As an optional embodiment, the first connection end 23 is provided with a clamping block 25 , and the second connection end 24 is provided with a clamping groove; the clamping block 25 is adapted to the clamping groove.

[0050] Specifically, the clamping block 25 is linear, and a clamping block 26 is provided on the end face of the clamping block 25; the clamping slot is linear, and when the clamping block 25 is fully inserted into the clamping slot, the clamping block 26 is engaged with the clamping slot on the inner wall of the clamping slot.

[0051] It should be noted that, in addition to being connected by a connecting nut, the first terminal pin 21 and the second terminal pin 22 can also be connected by a snap-fitting manner.

[0052] Specifically, the first connecting end 23 is set as a linear clamping block 25, and the second connecting end 24 is set as a linear clamping groove. When the first terminal needle 21 and the second terminal needle 22 need to be connected, the clamping block 25 is inserted into the clamping groove for connection. Since the first terminal needle 21 and the second terminal needle 22 are both threadedly connected to the end of the terminal shell 1 through the fixing bolt 61, the first terminal needle 21 and the second terminal needle 22 are connected by clamping, which can achieve the same effect as connecting the first terminal needle 21 and the second terminal needle 22 by the connecting bolt in the previous embodiment.

[0053] As an optional embodiment, the first connection end 23 is provided with a clamping block 25 , and the second connection end 24 is provided with a clamping groove; the clamping block 25 is adapted to the clamping groove.

[0054] Specifically, the clamping block 25 is bent, and a clamping block 26 is provided on the end face of the clamping block 25; the shape of the inner wall of the clamping groove is adapted to the clamping block 25, and when the clamping block 25 is fully inserted into the clamping groove, the clamping block 26 is engaged with the clamping groove on the inner wall of the clamping groove.

[0055] Different from the previous embodiment, the clamping block 25 and the inner wall of the clamping groove are both bent. The purpose of setting them to be bent is to increase the contact area and friction between the clamping block 25 and the clamping groove through the bent portion of the clamping block 25, so that the clamping block 25 and the clamping groove can be more stably connected and not easily detached, thereby significantly improving the stability and reliability of the connection between the first terminal pin 21 and the second terminal pin 22.

[0056] When connecting the first terminal pin 21 and the second terminal pin 22, simply insert the bent clamping block 25 precisely into the corresponding clamping slot, ensuring that the clamping block 26 fits perfectly into the slot to achieve a secure connection. This clamping method is not only simple and quick to operate, but also effectively prevents the risk of DC load voltage loss caused by a loose connection, further ensuring the stable and safe operation of the power grid.

[0057] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A split type DC feeder maintenance terminal, characterized by: include, A terminal shell (1), and a terminal assembly (2) movably connected to an end portion of the terminal shell (1); The terminal assembly (2) comprises at least two groups of terminal pins, and the ends of two adjacent groups of terminal pins are in contact through a movable connection; Each group of terminal pins is provided with a main terminal post (3) and an auxiliary terminal post (4); By connecting the auxiliary terminal (4) to the backup power supply (5) and then separating the two groups of terminal pins, the terminals can be replaced under power supply conditions.

2. The split type DC feeder maintenance terminal according to claim 1, characterized in that: The cables and terminal pins inserted into the main terminal (3) can form a feeder branch; Connecting the auxiliary terminal (4) to the backup power supply (5) and then separating the two groups of terminal pins can achieve isolation of the feeder branch.

3. The split type DC feeder maintenance terminal according to claim 2, characterized in that: The terminal assembly (2) is connected to the end of the terminal shell (1) via a connecting assembly (6).

4. The split type DC feeder maintenance terminal according to claim 3, characterized in that: The connecting assembly (6) comprises a fixing bolt (61) and a pressing bolt (62), wherein the fixing bolt (61) is used to fix the terminal pin to the end of the terminal shell (1), and the pressing bolt (62) is used to fix the cable in the main terminal post (3).

5. The split type DC feeder maintenance terminal according to claim 4, characterized in that: The terminal housing (1) is provided with a first threaded hole at the end thereof, and the number of the first threaded holes is the same as the number of the fixing bolts (61); The first threaded hole is adapted to fit the fixing bolt (61).

6. The split type DC feeder maintenance terminal according to claim 5, characterized in that: The two adjacent groups of terminal needles are respectively a first terminal needle (21) and a second terminal needle (22), an end of the first terminal needle (21) close to the second terminal needle (22) is a first connection end (23), and an end of the second terminal needle (22) close to the first terminal needle (21) is a second connection end (24).

7. The split type DC feeder maintenance terminal according to claim 6, characterized in that: The first connecting end (23) is provided with a first connecting through hole, and the second connecting end (24) is provided with a second connecting through hole; When the first connecting through hole and the second connecting through hole are connected, a connecting bolt passes through the first connecting through hole and the second connecting through hole at the same time and is threadedly connected to the connecting threaded hole at the end of the terminal shell (1).

8. The split type DC feeder maintenance terminal according to claim 6, characterized in that: The first connecting end (23) is provided with a snap-fit ​​block (25), and the second connecting end (24) is provided with a snap-fit ​​groove; The clamping block (25) is adapted to the clamping slot.

9. The split type DC feeder maintenance terminal according to claim 8, characterized in that: The clamping block (25) is linear, and a clamping block (26) is provided on the end surface of the clamping block (25); The clamping slot is linear, and when the clamping block (25) is fully inserted into the clamping slot, the clamping block (26) is engaged with the clamping slot on the inner wall of the clamping slot.

10. The split type DC feeder maintenance terminal according to claim 8, characterized in that: The clamping block (25) is of a bent type, and a clamping block (26) is provided on the end surface of the clamping block (25); The shape of the inner wall of the clamping groove is adapted to the clamping block (25); when the clamping block (25) is fully inserted into the clamping groove, the clamping block (26) is clamped with the clamping groove of the inner wall of the clamping groove.

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