Program lock structure of dual-power supply system and operation method

Abstract

The invention relates to a program lock structure of a dual-power supply system and an operation method, the program lock structure comprises three program lock units, the three program lock units are installed on two incoming line cabinets and a bus coupler cabinet panel, each program lock unit comprises a program lock, a first rod and a second rod, a lock rod of the program lock is installed on the cabinet panel, the lock rod is connected with a lock plate, and the lock plate is connected with the first rod and the second rod. Two keys are inserted into the three program locks, the first rod and the second rod are installed on the panel in an up-down sliding mode, the lower portion of the second rod is rotatably connected with a closing index rod of the cabinet where the second rod is located, and when the cabinet where the second rod is located is in a closing state, the keys abut against the second rod through the locking pieces and cannot rotate to the vertical position clockwise, and the keys are in a locked state and cannot be pulled out. And in an opening state, the closing index rod drives the second rod to move, so that the second rod is separated from the locking plate, the key can clockwise rotate to a vertical position and is pulled out, and meanwhile, the locking plate rotates to be buckled with the closing knob. The defect that only single power supply or double power supplies can be used for power supply can be completely overcome, and the power supply reliability is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution networks, and particularly to a program lock structure and an operation method for a dual-power supply system applicable to an upper isolation two-position circuit breaker, which is a structure that can ensure safe power supply when switching the power supply in a distribution network with dual-power supply. Background Art

[0002] As a highly reliable power supply solution, a dual-power supply system supplies power to equipment through two independent power lines, ensuring that the standby power supply can quickly take over when the main power supply has problems and maintaining the stable operation of the equipment. This system plays an important role in improving the stability and reliability of equipment and has become a standard configuration especially in fields such as data centers, medical care, and aerospace.

[0003] However, when using dual-power supply, the two power lines are powered by two transformers, and the power supply quality of each is different. It is necessary to ensure the independence of the power supplies.

[0004] For an upper isolation upper earthing switch with the incoming line cabinet having earthing, only a program lock can be used to lock the main switch. When the incoming line cabinet is de-energized, the bushing is still energized, and maintenance of this incoming line cabinet cannot be carried out.

[0005] In view of this, how to design a program lock structure and an operation method for a dual-power supply system that can meet the above technical requirements is a topic that the inventor of the present invention has painstakingly studied. Summary of the Invention

[0006] The purpose of the present invention is to provide a program lock structure and an operation method for a dual-power supply system, which can completely solve the defect of only being able to supply power with a single power supply or supply power separately with dual power supplies, and ensure the reliability of power supply.

[0007] To achieve the above purpose, the technical solution of the present invention is: a program lock structure for a dual-power supply system, which includes three program lock units. The three program lock units are installed on the panels of two incoming line cabinets and a bus-coupler cabinet. Each program lock unit includes a program lock, a first rod, and a second rod. The locking rod of the program lock is installed on the panel of the cabinet where it is located, and a locking piece is connected to the locking rod. Two keys are inserted into the three program locks. The first rod and the second rod are slidably installed on the panel of the cabinet where they are located. The lower part of the second rod is rotatably connected to the closing index rod of the cabinet where it is located. When the cabinet where it is located is in the closing state, the key is blocked by the locking piece connected to it and the second rod and cannot be rotated clockwise to the vertical position, and it is in a locked state and cannot be pulled out; when in the opening state, the closing index rod drives the second rod to move, so that the second rod is separated from the locking piece, the key can be rotated clockwise to the vertical position and pulled out, and at the same time the locking piece rotates to be buckled with the closing knob of the cabinet where it is located.

[0008] The program lock structure of the dual-power supply system of the present invention, wherein the bus-coupling cabinet and the lifting cabinet are installed between the two incoming line cabinets.

[0009] The program lock structure of the dual-power supply system of the present invention, wherein a first convex bend portion and a second convex bend portion protruding forward are respectively provided in the middle of the front surface of the second rod and at the lower end of the lock piece. In the closing state, the first convex bend portion contacts the second convex bend portion, so that the second rod blocks the lock piece; in the opening state, the first convex bend portion disengages from the second convex bend portion, so that the lock piece is unlocked.

[0010] The program lock structure of the dual-power supply system of the present invention, wherein the lower part of the second rod and both ends of the closing index rod and the toggle arm are rotatably connected.

[0011] The program lock structure of the dual-power supply system of the present invention, wherein the first rod and the second rod are installed between the opening knob and the closing knob of the cabinet where they are located.

[0012] The program lock structure of the dual-power supply system of the present invention, which further includes an electromagnetic lock assembly installed on the panel of the incoming line cabinet. The electromagnetic lock assembly includes an electromagnetic lock, a first connecting piece and a second connecting piece installed on the panel. The protruding end of the lock rod of the electromagnetic lock is rotatably connected to one end of the first connecting piece. The other end of the first connecting piece is rotatably connected to the second connecting piece. A limiting structure is provided on the second connecting piece. When the lock rod of the electromagnetic lock moves, the lock rod drives the second connecting piece to move through the first connecting piece. The second connecting piece slides up and down under the action of the limiting structure. When the bushings of the two incoming line cabinets are energized, the electromagnetic lock is energized and in a locked state and cannot be unlocked, so that the second connecting piece blocks the isolation grounding operation hole of the incoming line cabinet and cannot be separated to the grounding position; when the bushing is not energized, the electromagnetic lock drives the second connecting piece to move, and unlocks the isolation grounding operation hole.

[0013] The limiting structure of the program lock structure of the dual-power supply system of the present invention includes an inclined hole provided on the second connecting piece and at least one support plate for positioning the up and down sliding of the second connecting piece. The first connecting piece and the second connecting piece are rotatably connected by a pin shaft. The pin shaft passes through the inclined hole. The support plate is fixed on the panel. The second connecting piece can slide down through the channel formed between the support plate and the panel.

[0014] The program lock structure of the dual-power supply system of the present invention, wherein a hook portion is provided at the upper end of the lock piece. In the opening state, the lock piece rotates until the hook portion is buckled with the convex circle on the closing knob. The middle of the lock piece is rotatably connected to the lock rod.

[0015] An operation method of a program lock structure for a dual-power supply system, where the operation method is the operation method for replacing the incoming line cabinet, including:

[0016] (1) Rotate the circuit breaker knob of the incoming line cabinet to be replaced to trip, and cut off the power supply of the switch of this incoming line cabinet;

[0017] (2) Turn the key to lock the closing knob of this incoming line cabinet, and this incoming line cabinet cannot perform closing operations;

[0018] (3) Pull out the key, insert the key into the program lock of the cabinet to be closed, turn the key counterclockwise to separate the locking piece from the closing knob, and turn the closing knob to close. After this circuit is closed, the key is in a locked state and cannot be rotated. At this time, the incoming line cabinet tripped in step (2) cannot perform closing operations either, ensuring that only two of the three cabinets can be in the closed state and the other cabinet is in the tripped state.

[0019] An operation method of a program lock structure for a dual-power supply system, where the operation method is the operation method when maintenance is required when the overall switch of the dual-power supply system is in a power-off state, including:

[0020] (1) Perform a tripping operation on the switches of two cabinets in the closed state among the three cabinets. First, trip the main switch, and then perform a tripping operation on the disconnecting switch to the pre-grounding state;

[0021] (2) Rotate the energy storage shaft to store energy. After reaching the position, rotate the closing knob to close the main switch. The entire switch is in a grounded state and can be repaired and maintained.

[0022] After adopting the above solution, the program lock structure and operation method of the dual-power supply system of the present invention have the following beneficial effects:

[0023] 1. The program lock structure of the present invention can ensure that only two of the two incoming line cabinets and one tie cabinet are in the closed position, which can completely solve the problem of only single-power supply or separate dual-power supply, and ensure the reliability of power supply.

[0024] 2. The structure of the present invention is simple and meets the five-prevention requirements of electrical equipment; it is only equipped with two keys and cannot operate the three program locks at the same time, completely avoiding misoperation. The program lock is a completely mechanical locking structure and has stable operation.

[0025] 3. The program lock structure of the present invention is applied to the upper isolated two-station solid insulation switchgear, and the two incoming line cabinets adopt the upper grounding scheme. By equipping electromagnetic lock components on the two incoming line cabinets, when the incoming line bushing is energized, the electromagnetic lock locks the grounding operation hole, and according to the on-site use requirements, only the circuit breaker closing operation hole can be locked, preventing the circuit breaker from being mistakenly closed after the incoming line cabinet is tripped, resulting in the situation of simultaneous power supply of two transformers and causing the double power sources to operate in loop and resulting in a power supply accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic diagram of the external structure of an embodiment of the program lock structure of the dual-power supply system of the present invention;

[0027] Figure 2 FIG. is a front view structural schematic diagram of an embodiment of the program lock unit of the program lock structure of the present invention;

[0028] Figure 3 FIG. is a three-dimensional structural schematic diagram of an embodiment of the program lock unit of the program lock structure of the present invention;

[0029] Figure 4 FIG. is a structural schematic diagram of the program lock unit in the closing state of the present invention;

[0030] Figure 5 FIG. is a structural schematic diagram of the program lock unit in the tripping state of the present invention;

[0031] Figure 6 FIG. is a front view structural schematic diagram of an embodiment of the electromagnetic lock component of the program lock structure of the present invention;

[0032] Figure 7 FIG. is a side view structural schematic diagram of an embodiment of the electromagnetic lock component of the program lock structure of the present invention.

[0033] The present invention will be further described below with reference to the accompanying drawings through embodiments;

[0034] Number description:

[0035] 1 - Incoming line cabinet 2 - Bus-coupler cabinet

[0036] 3 - Lifting cabinet 4 - Program lock

[0037] 5 - First rod 6 - Second rod

[0038] 7 - Lock rod 8 - Lock piece

[0039] 9 - Key 10 - Toggle arm

[0040] 11 - Closing index rod 12 - Tripping knob

[0041] 13 - Closing knob 14 - Hook part

[0042] 15 - First convex bending part 16 - Second convex bending part

[0043] 17 - Electromagnetic lock 18 - First connecting piece

[0044] 19 - Second connecting piece 20 - Pin shaft

[0045] 21 - Oblique hole 22 - Support plate

[0046] 23 - Isolation grounding operation hole 24 - Energy storage shaft Detailed implementation manners

[0047] The present invention will be described below according to the embodiments shown in the drawings. The disclosed embodiments can be considered illustrative in all aspects and are not restrictive. The scope of the present invention is not limited by the description of the following embodiments, but is only shown by the scope of the claims, and includes all modifications having the same meaning as the scope of the claims and within the scope of the claims.

[0048] The program lock structure and operation method of a dual - power - supply system of the present invention will be described below in conjunction with specific embodiments.

[0049] As Figures 1-3 shown, an embodiment of the program lock structure of a dual - power - supply system of the present invention includes three program lock units and two electromagnetic lock assemblies. The three program lock units are installed on the front and rear panels of two incoming line cabinets 1 and the bus - tie cabinet 2, and the two electromagnetic lock assemblies are installed on the front panels of the two incoming line cabinets 1. As Figure 1 shown, a bus - tie cabinet 2 and a lifting cabinet 3 are installed between the two incoming line cabinets 1. The switching equipment used in the power supply scheme of the present invention is an upper - isolation and upper - grounding scheme, and the switching equipment includes a loop switching equipment composed of a disconnector, a grounding switch, and a circuit breaker main switch. The switching equipment involved in the present invention is of an upper - isolation structure.

[0050] Refer to Figure 2 and Figure 3As shown, each program lock unit includes a program lock 4, a first rod 5 and a second rod 6. The locking rod 7 of the program lock 4 is installed on the front panel of the incoming line cabinet 1 or the mother coupling cabinet 2, and the locking rod 7 is connected to the locking plate 8, specifically, the middle part of the locking plate 8 is sleeved and fixed on the locking rod 7. Two keys 9 are inserted on the three program locks 4. The program lock 4 in this embodiment is a lock with a self-locking device, which can only be pulled out when the key 9 is turned to a vertical position. When the key 9 is turned, the locking rod 7 and the locking plate 8 can be driven to rotate. And only the program lock 4 on the cabinet in the closed state is inserted with the key 9, and the key 9 cannot be pulled out in the locked state. The first rod 5 and the second rod 6 can be slid up and down and installed on the back panel of the cabinet. The first rod 5 and the second rod 6 of this embodiment are arranged vertically with right and left intervals, wherein the second rod 6 is composed of two vertical rods located at the upper and lower parts and an inclined arc-shaped rod located between the two. The portion of the second rod 6 between the arc-shaped rod and the lower vertical rod is hinged to one end of the crank arm 10 through a pin shaft, and the other end of the crank arm 10 is rotatably connected to the closing indicator rod 11 on the cabinet. The first rod 5 and the second rod 6 are installed between the opening knob 12 and the closing knob 13 of the cabinet. A hook portion 14 is provided at the upper end of the lock plate 8.

[0051] refer to Figure 4 As shown, when the cabinet is in the closed state, the key 9 on the cabinet cannot be rotated clockwise to the vertical position because the lock plate 8 connected to it contacts the second rod 6. In this embodiment, the first convex bend 15 and the second convex bend 16 extending forward are respectively provided at the middle of the front surface of the second rod 6 and the lower end of the lock plate 8. In the closed state, the first convex bend 15 contacts the second convex bend 16, so that the second rod 6 blocks the rotation of the lock plate 8, and the lock plate 8 and the key 9 on the program lock 4 cannot be rotated clockwise to the vertical position, and the key 9 cannot be pulled out; refer to Figure 5 As shown, when the cabinet is in the open state, the closing indicator rod 11 of the cabinet rotates, which drives the second rod 6 to move downward through the crank arm 10, so that the first convex bend 15 and the second convex bend 16 are separated, and then the second rod 6 no longer blocks the rotation of the lock plate 8. At this time, the key 9 can be turned clockwise to the vertical position and pulled out. Figure 3 As shown, at this time, the locking piece 8 rotates until the hook portion 14 is locked together with the convex circle on the closing knob 13, ensuring that the closing knob 13 cannot rotate.

[0052] The two incoming cabinets 1 are grounded. In order to prevent the isolation grounding shaft from being mistakenly operated in the grounding position after the switch is opened, so that the incoming cabinet 1 is mistakenly grounded, an electromagnetic lock assembly is configured. Figure 6 and Figure 7As shown in the figure, the electromagnetic lock assembly includes an electromagnetic lock 17, a first connecting piece 18, and a second connecting piece 19 mounted on the front panel of the incoming line cabinet 1. The right end of the lock rod of the electromagnetic lock 17 is rotatably connected to the left end of the first connecting piece 18 through a pin shaft, and the right end of the first connecting piece 18 is rotatably connected to the second connecting piece 19 through a pin shaft 20. A limiting structure is provided on the second connecting piece 19. The limiting structure includes an inclined hole 21 provided on the second connecting piece 19 and at least one support plate 22 for positioning the up-and-down sliding of the second connecting piece 19. The pin shaft 20 passes through the inclined hole 21. In this embodiment, the support plates 22 are horizontally placed and two are provided. The left and right ends of the support plates 22 are fixed to the front panel of the cabinet where they are located. The two support plates 22 are arranged at an interval up and down. A channel for the second connecting piece 19 to slide up and down is formed between the support plates 22 and the front panel of the cabinet where they are located. The second connecting piece 19 passes downward through this channel. The electromagnetic lock 17 in this embodiment is manually operated. When the incoming line sleeves on the two incoming line cabinets 1 are not energized, the lock rod of the electromagnetic lock 17 can be toggled left and right. When the lock rod of the electromagnetic lock 17 moves left and right, the lock rod drives the second connecting piece 19 to move through the first connecting piece 18, and the second connecting piece 19 slides up and down along the channel formed by the two support plates 22 and the front panel under the action of the limiting structure. When the incoming line sleeves of the two incoming line cabinets 1 are energized, the electromagnetic lock 17 is energized and in a locked state and cannot be unlocked, so that the second connecting piece 19 blocks the isolation grounding operation hole 23 of the incoming line cabinet 1, and the disconnecting switch cannot be separated to the grounding position; when the incoming line sleeve is not energized, the electromagnetic lock 17 drives the second connecting piece 19 to move, unlocking the isolation grounding operation hole 23, and the disconnecting switch can be operated to the grounding position.

[0053] When it is necessary to replace one incoming line cabinet 1, under the normal power supply state, that is, when the two incoming line cabinets 1 and the bus-coupling cabinet 2 are in the closing position, there can only be three states: both incoming line cabinets 1 are closed and the bus-coupling cabinet 2 is open; one of the two incoming line cabinets 1 and the bus-coupling cabinet 2 are closed, and the other incoming line cabinet 1 is open. The latter two states are only for one transformer to supply power. The specific operation steps for replacing the incoming line cabinet include:

[0054] (1) Rotate the opening knob 12 of the incoming line cabinet 1 to be replaced to perform an opening operation to cut off the power supply of the switch of this incoming line cabinet. At this time, the second rod 6 moves downward;

[0055] (2) Turn the key 9 to lock the closing knob 13 of this incoming line cabinet with the lock piece 8, and this incoming line cabinet cannot perform a closing operation;

[0056] (3) Pull out the key 9 and insert it into the program lock 4 of the cabinet to be closed. Rotate the key 9 counterclockwise to separate the lock piece 8 from the convex circle of the closing knob 13, turn the key 9 to the vertical position, and then rotate the closing knob 13 to close the switch. After this circuit is closed, the second rod 6 moves upward, and the first convex bend 15 on it blocks the second convex bend 16 on the lock piece 8, making the key 9 unable to rotate. In this way, the cabinet in the open state cannot be closed, ensuring that only two of the three cabinets, namely the two incoming line cabinets 1 and the bus-coupler cabinet 2, can be in the closed state, and the other cabinet is in the open state, ensuring the reliability of power consumption.

[0057] When the overall switch is in a power-off state and maintenance is required, the operation steps include:

[0058] (1) Perform a tripping operation on the switches of the two cabinets that are in the closed state among the three cabinets. At this time, there is no need to rotate the program lock 4 because the incoming line bushing is not energized during a power outage, and the electromagnetic lock 17 can also be unlocked. First, trip the main switch, and then operate the disconnecting switch to the pre-grounding state;

[0059] (2) Rotate the energy storage shaft 24 to store energy. After it is in place, rotate the closing knob 13 to close the main switch, making the grounding circuit conductive, ensuring that the entire switch is in the grounded state. At this time, the cabinet door can be opened for inspection and maintenance. After completion, perform a power-on operation as required.

[0060] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A program lock structure for a dual-power supply system, characterized in that, It includes three program lock units. The three program lock units are installed on the panels of two incoming line cabinets and the bus coupler cabinet. Each program lock unit includes a program lock, a first rod and a second rod. The locking rod of the program lock is installed on the panel of the corresponding cabinet. A lock piece is connected to the locking rod. Two keys are inserted into the three program locks. The first rod and the second rod are slidably installed on the panel of the corresponding cabinet. The lower part of the second rod is rotatably connected to the closing indicator rod of the corresponding cabinet. When the corresponding cabinet is in the closing state, the key is blocked by the lock piece and the second rod connected thereto and cannot be rotated clockwise to the vertical position, and it is in a locked state and cannot be pulled out. When in the opening state, the closing indicator rod drives the second rod to move, so that the second rod is separated from the lock piece. The key can be rotated clockwise to the vertical position and pulled out. At the same time, the lock piece rotates to be buckled with the closing knob of the corresponding cabinet.

2. The program lock structure of the dual-power supply system according to claim 1, characterized in that, The bus coupler cabinet and the lifting cabinet are installed between the two incoming line cabinets.

3. The program lock structure of the dual-power supply system according to claim 1, characterized in that, A first convex bend and a second convex bend extending forward are respectively provided in the middle of the front surface of the second rod and at the lower end of the lock piece. When in the closing state, the first convex bend contacts the second convex bend, so that the second rod blocks the lock piece. When in the opening state, the first convex bend is separated from the second convex bend, so that the lock piece is unlocked.

4. The program lock structure of the dual-power supply system according to claim 1, characterized in that, The lower part of the second rod, the closing indicator rod and the two ends of the toggle arm are rotatably connected.

5. The program lock structure of the dual-power supply system according to claim 1, characterized in that, The first rod and the second rod are installed between the opening knob and the closing knob of the corresponding cabinet.

6. The program lock structure of the dual-power supply system according to claim 1, characterized in that, It further includes an electromagnetic lock assembly installed on the panel of the incoming line cabinet. The electromagnetic lock assembly includes an electromagnetic lock, a first connecting piece and a second connecting piece installed on the panel. The extending end of the locking rod of the electromagnetic lock is rotatably connected to one end of the first connecting piece. The other end of the first connecting piece is rotatably connected to the second connecting piece. A limiting structure is provided on the second connecting piece. When the locking rod of the electromagnetic lock moves, the locking rod drives the second connecting piece to move through the first connecting piece. The second connecting piece slides up and down under the action of the limiting structure. When the bushings of the two incoming line cabinets are energized, the electromagnetic lock is energized and in a locked state and cannot be unlocked, so that the second connecting piece blocks the isolating and earthing operation hole of the incoming line cabinet and cannot be separated to the earthing position. When the bushing is de-energized, the electromagnetic lock drives the second connecting piece to move to unlock the isolating and earthing operation hole.

7. The program lock structure of the dual-power supply system according to claim 6, characterized in that, The limiting structure includes an inclined hole provided on the second connecting piece and at least one support plate for positioning the up and down sliding of the second connecting piece. The first connecting piece and the second connecting piece are rotatably connected through a pin shaft. The pin shaft passes through the inclined hole. The support plate is fixed on the panel. The second connecting piece can slide down through the channel formed between the support plate and the panel.

8. The program lock structure of the dual-power supply system according to claim 1, characterized in that A hook is provided at the upper end of the lock piece. When in the opening state, the lock piece rotates until the hook is buckled with the convex circle on the closing knob. The middle part of the lock piece is rotatably connected to the locking rod.

9. An operating method for a program lock structure of a dual-power supply system according to any one of claims 1-8, characterized in that, The operation method is the operation method for replacing the incoming line cabinet, including: (1) Rotate the opening knob of the incoming line cabinet to be replaced to trip the circuit breaker, and cut off the power supply of the switch of this incoming line cabinet. (2) Turn the key to lock the closing knob of this incoming line cabinet with the lock piece, and this incoming line cabinet cannot perform the closing operation. (3) Pull out the key, insert the key into the program lock of the cabinet to be closed, turn the key counterclockwise to separate the lock piece from the closing knob, and turn the closing knob to close the circuit breaker. After the circuit breaker of this loop is closed, the key is in a locked state and cannot be rotated. At this time, the incoming line cabinet tripped in step (2) also cannot perform the closing operation, ensuring that only two of the three cabinets can be in the closed state and the other cabinet is in the open state.

10. An operating method of a program lock structure of a dual-power supply system according to any one of claims 1-8, characterized in that, The operation method is for maintenance when the overall switch of the dual-power supply system is in a power-off state, and includes: (1) Perform the opening operation on the switches of two of the three cabinets in the closed state. First, open the main switch, and then operate the disconnector to the pre-grounding state. (2) Rotate the energy storage shaft to store energy. After it is in place, turn the closing knob to close the main switch. The entire switch is in the grounded state and maintenance can be carried out.

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