Five-prevention mechanical interlocking mechanism of upper isolation three-station ring main unit

Abstract

The invention relates to an upper isolation three-station ring main unit five-prevention mechanical interlocking mechanism. Comprising a fixed plate, a circuit breaker closing operation shaft, a circuit breaker opening operation shaft, a circuit breaker opening and closing indication shaft, a grounding switch operation shaft, an isolation switch operation shaft, a first interlocking rod, a second interlocking rod, a third interlocking rod, a fourth interlocking rod, a fifth interlocking rod, a sixth interlocking rod and an interlocking deflector rod. The upper end and the lower end of the first interlocking rod are correspondingly matched with a breaker opening operation shaft and a cable bin door, the upper end of the second interlocking rod is provided with an isolation shaft separation blade, the lower end of the second interlocking rod is matched with the cable bin door, the upper end of the third interlocking rod is provided with a grounding shaft separation blade, and the upper end and the lower end of the fourth interlocking rod are correspondingly matched with a grounding switch operation shaft and the cable bin door. The right end of the fifth interlocking rod is matched with the grounding switch operation shaft, the left end of the fifth interlocking rod is provided with an isolation shaft blocking piece, the left end of the sixth interlocking rod is matched with the isolation switch operation shaft, the left end of the sixth interlocking rod is provided with a grounding shaft blocking piece, and the interlocking shifting rod is connected with the second interlocking rod and the third interlocking rod.

Description

Technical Field

[0001] This invention relates to a ring main unit, specifically to a five-proof mechanical interlocking mechanism for an upper-isolated three-position ring main unit. Background Technology

[0002] Electrical accidents caused by misoperation occur frequently in power systems. These accidents not only damage equipment but can also lead to casualties and widespread power outages. As power systems expand in scale and complexity, traditional manual operation methods are insufficient to completely prevent misoperation. To meet the "five-proof" requirements (anti-interference, anti-damage, anti-switching, and anti-interference), the power industry has begun exploring various interlocking technologies, including mechanical and electrical ones, to ensure the correctness and safety of the operating sequence through forced interlocking or warning devices. Simultaneously, the state has successively issued relevant standards, such as the GB 3906 series standards, which clearly stipulate that metal-enclosed switchgear must possess complete five-proof interlocking functions, promoting the standardization and normalization of five-proof interlocking technology.

[0003] Most ring main units (RNBs) employ mechanical interlocking devices, such as mechanical interlocking between disconnecting switches and circuit breakers, and interlocking between grounding switches and disconnecting switches. These mechanical structures restrict the operating sequence to prevent misoperation. For example, when the circuit breaker is in the operating position, the disconnecting switch cannot be operated, ensuring that the operation of opening and closing the disconnecting switch under load is prohibited. Some RNBs also introduce electrical interlocking, connecting the auxiliary contacts of the circuit breaker, disconnecting switch, and grounding switch to the electrical operating circuit. For instance, when the circuit breaker is not open, the closing circuit of the disconnecting switch is cut off to achieve electrical interlocking. However, the existing five-proof interlocking system of the three-position upper-isolation RNB has many problems in practical applications and needs further improvement or perfection. These problems mainly manifest in the following aspects: 1. Some structures are difficult to interlock, with only electrical interlocking and no corresponding mechanical interlocking, or the mechanical interlocking is incomplete. For example, when the disconnecting switch is open and the circuit breaker is closed, the grounding switch can be operated. If the electrical interlock fails or during maintenance, misoperation can easily lead to the risk of electric shock from induced current or residual charge. 2. Reliability issues with mechanical interlocking: Mechanical interlocking components are machined from carbon steel, making them susceptible to factors such as large machining errors, corrosion, and jamming, leading to interlocking failure. For example, the interlocking linkage may break after long-term use, and the locking tongue may fail to engage properly, causing the disconnect switch or handcart to be operated unnecessarily. 3. Limited environmental adaptability: In harsh environments, such as humid, high-temperature, dusty, or corrosive gas environments, the performance and reliability of the five-proof interlocking device will be affected, and mechanical components are prone to rust, increasing the probability of failure. Summary of the Invention

[0004] The purpose of this invention is to provide a five-proof mechanical interlocking mechanism for a three-position upper isolation ring main unit, which has the advantages of stable structure, strong functionality, good adaptability, and safety and reliability.

[0005] To address the problems existing in the prior art, this invention provides a five-proof mechanical interlocking mechanism for a three-position upper-isolation ring main unit, comprising a fixed plate and circuit breaker closing operating shaft, circuit breaker opening operating shaft, circuit breaker opening / closing indicator shaft, grounding switch operating shaft, and disconnecting switch operating shaft mounted on the fixed plate via bearings. The fixed plate is also equipped with a first interlocking rod, a second interlocking rod, a third interlocking rod, a fourth interlocking rod, a fifth interlocking rod, and a sixth interlocking rod that slide with it. A opening limit block is fixed on the circuit breaker opening operating shaft. A circuit breaker opening / closing indicator shaft is fixed with a circuit breaker crank arm and a circuit breaker indicator plate. A first circuit breaker actuating pin and a second circuit breaker actuating pin are correspondingly fixed on the circuit breaker crank arm and the indicator plate. A grounding switch operating shaft is fixed with a first grounding crank arm and a second grounding crank arm. A grounding actuating pin is fixed on the second grounding crank arm. An isolating actuating pin is fixed on the isolating switch operating shaft via an isolating crank arm. The upper and lower ends of the first interlocking rod mate with the opening limit block and the cable compartment door, respectively. The second interlocking rod has a long, strip-shaped first circuit breaker actuating pin that mates with the first circuit breaker actuating pin. The second interlocking rod has a first isolating shaft stop plate at its upper end, which blocks the operating shaft of the disconnecting switch during circuit breaking and closing. The lower end of the second interlocking rod engages with the cable compartment door. The lower end of the third interlocking rod has a third circuit breaking toggle pin, and the upper end of the third interlocking rod has a first grounding shaft stop plate, which blocks the operating shaft of the grounding switch during circuit breaking and closing. The upper and lower ends of the fourth interlocking rod correspondingly engage with the first grounding crank arm and the cable compartment door. A return spring is provided between the fifth interlocking rod and the fixing plate. The right end of the fifth interlocking rod engages with the grounding toggle pin, and the left end of the fifth interlocking rod... The device includes a second isolating shaft baffle that blocks the operating shaft of the disconnect switch when the grounding is closed; a long strip-shaped isolating pin hole that mates with the isolating toggle pin at the left end of the sixth interlocking rod; and a second grounding shaft baffle that blocks the operating shaft of the grounding switch when the grounding is closed. It also includes an interlocking lever hinged to a fixed plate in the middle via a pin. One end of the interlocking lever has a long strip-shaped second circuit breaker pin hole that mates with the second circuit breaker toggle pin, and the other end of the interlocking lever has a long strip-shaped third circuit breaker pin hole that mates with the third circuit breaker toggle pin.

[0006] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position upper isolation ring main unit, wherein the first interlocking rod, the second interlocking rod, the third interlocking rod, the fourth interlocking rod, the fifth interlocking rod, the sixth interlocking rod, and the interlocking lever are all made of PA66+30GF material and are injection molded.

[0007] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein a grounding micro switch and an isolation micro switch are installed on the fixed plate, a stop block that cooperates with the grounding micro switch is provided on the fourth interlocking rod, and the left end of the sixth interlocking rod cooperates with the isolation micro switch.

[0008] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the first interlocking rod is provided with two or more vertical first guide holes, the fixing plate is fixed with a first guide pin in the first guide hole, and a flat washer and a stop clip are installed on the first guide pin.

[0009] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the second interlocking rod is provided with two or more vertical second guide holes, and the fixing plate is fixed with a second guide pin in the second guide hole, and a flat washer and a stop clip are installed on the second guide pin.

[0010] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the third interlocking rod is provided with two or more vertical third guide holes, the fixing plate is fixed with a third guide pin in the third guide hole, and a flat washer and a stop are installed on the third guide pin.

[0011] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the fourth interlocking rod is provided with two or more vertical fourth guide holes, the fixing plate is fixed with a fourth guide pin in the fourth guide hole, and a flat washer and a stop are installed on the fourth guide pin.

[0012] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the third interlocking rod is stacked on the fourth interlocking rod, the third guide hole and part of the fourth guide hole are distributed in a one-to-one correspondence, the third guide pin and the fourth guide pin at the corresponding position are the same guide pin, and a gasket is sleeved on the third guide pin between the third interlocking rod and the fourth interlocking rod.

[0013] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position upper isolation ring main unit, wherein the fifth interlocking rod is provided with two or more horizontal fifth guide holes, the fixing plate is fixed with a fifth guide pin in the fifth guide hole, and a flat washer and a stop are installed on the fifth guide pin; the left and right ends of the reset spring are fixed to the fifth interlocking rod and the fifth guide pin respectively.

[0014] Furthermore, the present invention provides a five-proof mechanical interlocking mechanism for a three-position ring main unit with upper isolation, wherein the sixth interlocking rod is provided with two or more horizontal sixth guide holes, the fixing plate is fixed with a sixth guide pin in the sixth guide hole, and a flat washer and a stop are installed on the sixth guide pin.

[0015] Compared with existing technologies, the five-proof mechanical interlocking mechanism for a three-position upper isolation ring main unit of the present invention has the following advantages: The present invention uses a fixed plate and circuit breaker closing operation shaft, circuit breaker opening operation shaft, circuit breaker opening / closing indicator shaft, grounding switch operation shaft, and disconnecting switch operation shaft mounted on the fixed plate via bearings. A first interlocking rod, a second interlocking rod, a third interlocking rod, a fourth interlocking rod, a fifth interlocking rod, and a sixth interlocking rod are installed on the fixed plate and slidably engaged with them. A opening limit switch is fixed on the circuit breaker opening operation shaft. The circuit breaker's opening and closing indicator shaft is fixed with a circuit breaker crank arm and a circuit breaker indicator plate. A first circuit breaker actuating pin and a second circuit breaker actuating pin are correspondingly fixed on the circuit breaker crank arm and the circuit breaker indicator plate. A first grounding crank arm and a second grounding crank arm are fixed on the grounding switch operating shaft. A grounding actuating pin is fixed on the second grounding crank arm. An isolating actuating pin is fixed on the isolating switch operating shaft via an isolating crank arm. The upper and lower ends of the first interlocking rod mate with the opening limit block and the cable compartment door, respectively. The second interlocking rod has a first circuit breaker actuating pin in a long, narrow shape. The second interlocking rod has a first isolating shaft stop plate at its upper end, which blocks the operating shaft of the disconnecting switch during circuit breaking and closing. The lower end of the second interlocking rod engages with the cable compartment door. The lower end of the third interlocking rod has a third circuit breaking toggle pin, and the upper end of the third interlocking rod has a first grounding shaft stop plate, which blocks the operating shaft of the grounding switch during circuit breaking and closing. The upper and lower ends of the fourth interlocking rod correspondingly engage with the first grounding crank arm and the cable compartment door. A return spring is provided between the fifth interlocking rod and the fixing plate. The right end of the fifth interlocking rod engages with the grounding toggle pin, and the left end of the fifth interlocking rod has a connecting... The second isolating shaft baffle that blocks the operating shaft of the isolating switch when the ground is closed; the left end of the sixth interlocking rod is provided with an elongated isolating pin hole that cooperates with the isolating toggle pin; the left end of the sixth interlocking rod is provided with a second grounding shaft baffle that blocks the operating shaft of the grounding switch when the ground is closed; at the same time, an interlocking lever is provided with a centrally hinged to the fixed plate by a pin shaft, wherein one end of the interlocking lever is provided with an elongated second circuit breaker pin hole that cooperates with the second circuit breaker toggle pin, and the other end of the interlocking lever is provided with an elongated third circuit breaker pin hole that cooperates with the third circuit breaker toggle pin. This constitutes a five-proof mechanical interlocking mechanism that is structurally stable, highly functional, adaptable, and safe and reliable. In practical applications, the five-proof mechanical interlocking mechanism is installed on the upper isolating three-position ring main unit via a fixing plate, and the circuit breaker switch, disconnector switch, and grounding switch are connected to the circuit breaker closing operation shaft, circuit breaker opening operation shaft, circuit breaker opening / closing indicator shaft, grounding switch operation shaft, and disconnector switch operation shaft via corresponding operating mechanisms. Circuit breaker opening / closing operations can be performed via the circuit breaker opening and closing operation shafts, disconnector switch opening / closing operations can be performed via the disconnector switch operation shaft, and grounding switch opening / closing operations can be performed via the grounding switch operation shaft.

[0016] The specific procedures for opening and closing each switch are as follows: The ring main unit is initially de-energized. Closing the cable compartment door moves the first interlocking rod downwards, allowing for circuit breaker operation. Rotating the grounding switch operating shaft counter-clockwise opens the grounding switch. The first grounding crank pushes the fourth interlocking rod downwards and locks the cable compartment door. Simultaneously, the grounding toggle pin moves and releases the fifth interlocking rod to the right. Under the action of the return spring, the fifth interlocking rod moves to the right, and the second isolating shaft baffle clears the isolating switch operating shaft, releasing the isolating switch operation. Rotating the isolating switch operating shaft clockwise closes the isolating switch, and the isolating toggle pin moves the sixth interlocking rod. The locking lever moves to the right, and the second grounding shaft baffle blocks the grounding switch operating shaft, locking the grounding switch operation. The circuit breaker closing operating shaft is operated, and the circuit breaker closes. During the closing process, the circuit breaker operating mechanism drives the circuit breaker opening and closing indicator shaft to rotate clockwise. The first circuit breaker actuating pin moves the second interlocking lever upward, and the first isolating shaft baffle blocks the isolating switch operating shaft, locking the isolating switch operation. At the same time, the second circuit breaker actuating pin moves the interlocking lever counterclockwise. Through the lever principle, the interlocking lever moves the third interlocking lever upward, and the first grounding shaft baffle blocks the grounding switch operating shaft, locking the grounding switch operation, thus achieving the energized state. When a power outage or maintenance is required, rotating the circuit breaker tripping operating shaft clockwise will trip the circuit breaker. During tripping, the circuit breaker operating mechanism drives the circuit breaker tripping and closing indicator shaft to rotate counterclockwise. The first tripping pin moves the second interlocking rod downwards, and the first isolating shaft stop opens the isolating switch operating shaft, releasing the isolating switch operation. Simultaneously, the second tripping pin moves the interlocking lever clockwise, which, through leverage, moves the third interlocking rod downwards. The first grounding shaft stop opens the grounding switch operating shaft, releasing the grounding switch operation (at this time, the second grounding shaft stop still locks the grounding switch operation). Rotating the isolating switch operating shaft counterclockwise will trip the isolating switch. The isolating pin moves the sixth interlocking rod to the left, and the second grounding shaft stop opens the grounding switch operating shaft, releasing the grounding switch operation. Rotating clockwise... When the grounding switch is closed, the first grounding crank arm moves upward, and the fourth interlocking rod moves upward accordingly, releasing the cable compartment door. Simultaneously, the grounding actuating pin pushes the fifth interlocking rod to the left, and the second isolating shaft baffle blocks the isolating switch operating shaft, locking the isolating switch operation. When the circuit breaker is closed, the circuit breaker operating mechanism drives the circuit breaker opening / closing indicator shaft to rotate clockwise. The first circuit breaker actuating pin moves the second interlocking rod upward, and the first isolating shaft baffle blocks the isolating switch operating shaft, locking the isolating switch operation. At the same time, the second circuit breaker actuating pin moves the interlocking lever counterclockwise. Through the lever principle, the interlocking lever moves the third interlocking rod upward, and the first grounding shaft baffle blocks the grounding switch operating shaft, locking the grounding switch operation, achieving a complete grounding state.The above analysis shows that this invention designs a complete interlocking structure, solving the problem of missing mechanical interlocks in the upper isolation three-position ring main unit. This ensures the correctness and safety of the power supply and de-energization operation sequence, specifically, it mandates power supply in the sequence of "closing the cable compartment door - opening the grounding switch - closing the isolating switch - closing the circuit breaker," and mandates power de-energization and maintenance in the sequence of "opening the circuit breaker - opening the isolating switch - closing the grounding switch - closing the circuit breaker - opening the cable compartment door." Compared with existing technologies, this avoids the risk of electric shock from induced current or residual charge due to misoperation caused by electrical interlock failure. Attached Figure Description

[0017] Figure 1 This is a front view of the five-proof mechanical interlocking mechanism of the three-position isolation ring main unit of the present invention; Figure 2 for Figure 1 A magnified view of a portion of position A in the middle; Figure 3 The isometric view of the five-proof mechanical interlocking mechanism of the three-position isolation ring main unit of this invention. Figure 1 ; Figure 4 The isometric view of the five-proof mechanical interlocking mechanism of the three-position isolation ring main unit of this invention. Figure 2 ; Figure 5 This is an isometric view of the circuit breaker tripping operation axis of the present invention; Figure 6 This is an isometric view of the circuit breaker opening / closing indicator shaft of the present invention; Figure 7 This is an isometric view of the operating shaft of the grounding switch in this invention; Figure 8 This is an isometric view of the operating shaft of the disconnector switch in this invention. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0020] like Figures 1 to 8The present invention illustrates a specific embodiment of a five-proof mechanical interlocking mechanism for a three-position upper isolation ring main unit. A fixed plate 1 is provided, on which a circuit breaker closing operation shaft 2, a circuit breaker opening operation shaft 3, a circuit breaker opening / closing indicator shaft 4, a grounding switch operation shaft 5, and a disconnecting switch operation shaft 6 are mounted via bearings. A first interlocking rod 11, a second interlocking rod 12, a third interlocking rod 13, a fourth interlocking rod 14, a fifth interlocking rod 15, and a sixth interlocking rod 16 are mounted on the fixed plate 1 and slidably engaged with it. The circuit breaker tripping operation shaft 3 is fixed with a tripping limit block 31. The circuit breaker tripping and closing indicator shaft 4 is fixed with a tripping crank arm 41 and a tripping indicator plate 42. The tripping crank arm 41 and the tripping indicator plate 42 are respectively fixed with a first tripping toggle pin 43 and a second tripping toggle pin 44. The grounding switch operation shaft 5 is fixed with a first grounding crank arm 51 and a second grounding crank arm 52. The second grounding crank arm 52 is fixed with a grounding toggle pin 53. The isolating switch operation shaft 6 is fixed with an isolating toggle pin 62 through an isolating crank arm 61. The upper and lower ends of the first interlocking rod 11 are respectively engaged with the tripping limit block 31 and the cable compartment door. The second interlocking rod 12 is provided with a first tripping pin hole 121 that is elongated and engages with the first tripping toggle pin 43. The upper end of the second interlocking rod 12 is provided with a first isolating pin hole 121 that blocks the isolating switch operation shaft 6 when the circuit is tripped and closed. The lower end of the second interlocking rod 12 engages with the cable compartment door. The lower end of the third interlocking rod 13 is provided with a third circuit breaker toggle pin. The upper end of the third interlocking rod 13 is provided with a first grounding shaft baffle 131 that blocks the grounding switch operating shaft 5 when the circuit is closed. The upper and lower ends of the fourth interlocking rod 14 engage with the first grounding crank arm 51 and the cable compartment door respectively. A return spring 7 is provided between the fifth interlocking rod 15 and the fixing plate 1. The right end of the fifth interlocking rod 15 engages with the grounding toggle pin 53. The left end of the fifth interlocking rod 15 is provided with a second isolation shaft baffle 151 that blocks the grounding switch operating shaft 6 when the ground is closed. The left end of the sixth interlocking rod 16 is provided with an isolation pin hole 161 that engages with the isolation toggle pin 62 and is elongated. The left end of the sixth interlocking rod 16 is provided with a second grounding shaft baffle 162 that blocks the grounding switch operating shaft 5 when the ground is closed. Meanwhile, an interlocking lever 17 is provided in the middle, which is hinged to the fixed plate 1 by a pin. A second circuit breaker pin hole 171, which is elongated and cooperates with the second circuit breaker pin 44, is provided at one end of the interlocking lever 17. A third circuit breaker pin hole, which is elongated and cooperates with the third circuit breaker pin, is provided at the other end of the interlocking lever 17.

[0021] The above configuration constitutes a five-proof mechanical interlocking mechanism that is structurally stable, highly functional, adaptable, and safe and reliable. In practical applications, the five-proof mechanical interlocking mechanism is installed on the upper isolating three-position ring main unit via a fixing plate 1. The circuit breaker, disconnector, and grounding switch are connected to the circuit breaker closing operating shaft 2, circuit breaker opening operating shaft 3, circuit breaker opening / closing indicator shaft 4, grounding switch operating shaft 5, and disconnector operating shaft 6 via corresponding operating mechanisms. The circuit breaker can be opened or closed by operating the circuit breaker opening operating shaft 3 and the circuit breaker closing operating shaft 2; the disconnector can be opened or closed by operating the disconnector operating shaft 6; and the grounding switch can be opened or closed by operating the grounding switch operating shaft 5. The specific procedures for opening and closing each switch are as follows: The ring main unit is initially in a de-energized state. By closing the cable compartment door, the first interlocking rod 11 moves downward, allowing the circuit breaker to be operated. The grounding switch operating shaft 5 is rotated counterclockwise, opening the grounding switch. The first grounding crank arm 51 pushes the fourth interlocking rod 14 downward and locks the cable compartment door. Simultaneously, the grounding toggle pin 53 moves with it and releases the fifth interlocking rod 15, which moves to the right. Under the action of the return spring 7, the fifth interlocking rod 15 moves to the right, and the second isolating shaft baffle 151 clears the isolating switch operating shaft 6, releasing the isolating switch operation. The isolating switch operating shaft 6 is rotated clockwise, closing the isolating switch. The isolating toggle pin 62 moves the sixth interlocking rod 14. 6. Move to the right, the second grounding shaft baffle 162 blocks the grounding switch operating shaft 5, locking the grounding switch operation; operate the circuit breaker closing operating shaft 2 to close the circuit breaker. During the closing process, the circuit breaker operating mechanism drives the circuit breaker opening and closing indicator shaft 4 to rotate clockwise, the first circuit breaking toggle pin 43 moves the second interlocking rod 12 upward, the first isolating shaft baffle 122 blocks the isolating switch operating shaft 6, locking the isolating switch operation. At the same time, the second circuit breaking toggle pin 44 moves the interlocking lever 17 counterclockwise. Through the lever principle, the interlocking lever 17 moves the third interlocking lever 13 upward, the first grounding shaft baffle 131 blocks the grounding switch operating shaft 5, locking the grounding switch operation, and achieving the energized state.When a power outage or maintenance is required, rotate the circuit breaker tripping operation shaft 3 clockwise to trip the circuit breaker. During tripping, the circuit breaker operating mechanism drives the circuit breaker tripping and closing indicator shaft 4 to rotate counterclockwise. The first tripping pin 43 moves the second interlocking rod 12 downward, and the first isolating shaft baffle 122 opens the isolating switch operating shaft 6, releasing the isolating switch operation. At the same time, the second tripping pin 44 moves the interlocking lever 17 clockwise. Through the lever principle, the interlocking lever 17 moves the third interlocking lever 13 downward, and the first grounding shaft baffle 131 opens the grounding switch operating shaft 5, releasing the grounding switch operation (at this time, the second grounding shaft baffle 162 still locks the grounding switch operation). Rotate the isolating switch operating shaft 6 counterclockwise to trip the isolating switch. The isolating pin 62 moves the sixth interlocking rod 16 to the left, and the second grounding shaft baffle 162 opens the grounding switch operating shaft 5, releasing the grounding switch operation. Rotate clockwise... When the grounding switch operating shaft 5 is switched on, the grounding switch is closed. The first grounding crank arm 51 moves upward, and the fourth interlocking rod 14 moves upward accordingly, releasing the cable compartment door. At the same time, the grounding toggle pin 53 pushes the fifth interlocking rod 15 to the left, and the second isolating shaft baffle 151 blocks the isolating switch operating shaft 6, locking the isolating switch operation. The circuit breaker closing operating shaft 2 is operated to close the circuit breaker. During the closing process, the circuit breaker operating mechanism drives the circuit breaker opening and closing indicator shaft 4 to rotate clockwise. The first circuit breaking toggle pin 43 moves the second interlocking rod 12 upward, and the first isolating shaft baffle 122 blocks the isolating switch operating shaft 6, locking the isolating switch operation. At the same time, the second circuit breaking toggle pin 44 moves the interlocking lever 17 counterclockwise. Through the lever principle, the interlocking lever 17 moves the third interlocking rod 13 upward, and the first grounding shaft baffle 131 blocks the grounding switch operating shaft 5, locking the grounding switch operation, achieving a complete grounding state. The above analysis shows that this invention designs a complete interlocking structure, solving the problem of missing mechanical interlocks in the upper isolation three-position ring main unit. This ensures the correctness and safety of the power supply and de-energization operation sequence, specifically, it mandates power supply in the sequence of "closing the cable compartment door - opening the grounding switch - closing the isolating switch - closing the circuit breaker," and mandates power de-energization and maintenance in the sequence of "opening the circuit breaker - opening the isolating switch - closing the grounding switch - closing the circuit breaker - opening the cable compartment door." Compared with existing technologies, this effectively avoids the risk of electric shock from induced current or residual charge due to electrical interlock failure leading to misoperation. It should be noted that "circuit breaking closing" refers to the circuit breaker being in the closed state, "grounding closing" refers to the grounding switch being in the closed state, and "isolating closing" refers to the isolating switch being in the closed state. It should also be noted that when installing and using the interlocking mechanism, springs should be installed between the first interlocking rod 11 and the cable compartment door, and between the fourth interlocking rod 14 and the cable compartment door, respectively. This allows the first interlocking rod 11 to move upwards under the action of the springs after the cable compartment door is opened, thus blocking the tripping limit block 31. Conversely, after the grounding switch is closed, the fourth interlocking rod 14 can move upwards under the action of the springs, unlocking the cable compartment door. The specific installation methods for these two springs are well-known to technicians and will not be elaborated upon here.The circuit breaker switches, disconnect switches, grounding switches and their corresponding operating mechanisms mentioned above are all existing equipment in this field, and their structures, principles and transmission connections are well known to those skilled in the art.

[0022] As an optimization, this specific embodiment uses PA66+30GF material for the first interlocking rod 11, the second interlocking rod 12, the third interlocking rod 13, the fourth interlocking rod 14, the fifth interlocking rod 15, the sixth interlocking rod 16, and the interlocking lever 17, and they are all injection molded. This design has significant advantages over existing technologies, mainly in the following aspects: 1) PA66+30GF material has excellent properties such as high strength, high rigidity, corrosion resistance, wear resistance, and fatigue resistance, ensuring the stability and reliability of each interlocking rod and interlocking mechanism; 2) PA66+30GF material is a recyclable material, and compared with carbon steel, it has less environmental impact during production, use, and disposal, meeting the environmental protection requirements of modern manufacturing; 3) Through injection molding, while ensuring the strength and rigidity of each interlocking rod, it can effectively solve the problems of large processing errors and poor consistency of batch product precision, and effectively avoid the problems of corrosion and poor environmental adaptability of carbon steel parts; 4) Compared with carbon steel parts, injection molding reduces complex machining, heat treatment, and surface treatment processes, lowers manufacturing costs, and avoids jamming problems during use. As an optimization, to facilitate detection and control and thus improve safety, this specific embodiment also installs a grounding micro switch 8 and an isolating micro switch 9 on the fixed plate 1. The fourth interlocking rod 14 has a stop 141 that cooperates with the grounding micro switch 8, and the left end of the sixth interlocking rod 16 cooperates with the isolating micro switch 9. This configuration allows for accurate determination of the state of the grounding switch operating shaft 5 and the grounding switch by checking whether the grounding micro switch 8 is triggered, and for accurate determination of the state of the isolating switch operating shaft 6 and the isolating switch by checking whether the isolating micro switch 9 is triggered.

[0023] In a specific embodiment, the sliding fit structure between the first interlocking rod 11 and the fixing plate 1 is configured as follows: two or more vertically oriented first guide holes 111 are provided on the first interlocking rod 11; a first guide pin 112 located in the first guide holes 111 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the first guide pin 112 to prevent the first interlocking rod 11 from falling off. This configuration of the first interlocking rod 11 is characterized by its simple structure, ease of implementation, and smooth sliding. Similarly, the sliding fit structure between the second interlocking rod 12 and the fixing plate 1 is configured as follows: two or more vertically oriented second guide holes 123 are provided on the second interlocking rod 12; a second guide pin 124 located in the second guide holes 123 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the second guide pin 124 to prevent the second interlocking rod 12 from falling off. This configuration of the second interlocking rod 12 is also characterized by its simple structure, ease of implementation, and smooth sliding.

[0024] In a specific embodiment, the sliding fit structure between the third interlocking rod 13 and the fixing plate 1 is implemented as follows: two or more vertically oriented third guide holes 132 are provided on the third interlocking rod 13; a third guide pin 133 located in the third guide holes 132 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the third guide pin 133 to prevent the third interlocking rod 13 from falling off. Similarly, the sliding fit structure between the fourth interlocking rod 14 and the fixing plate 1 is implemented as follows: two or more vertically oriented fourth guide holes 142 are provided on the fourth interlocking rod 14; a fourth guide pin 143 located in the fourth guide holes 142 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the fourth guide pin 143 to prevent the fourth interlocking rod 14 from falling off. This configuration of the third interlocking rod 13 and the fourth interlocking rod 14 also features a simple structure, ease of implementation, and smooth sliding. In practical applications, to simplify the structure and improve compactness, the third interlocking rod 13 is typically stacked on top of the fourth interlocking rod 14. In this case, the third guide hole 132 corresponds one-to-one with a portion of the fourth guide hole 142. The third guide pin 133 and the fourth guide pin 143 at corresponding positions use the same guide pin. A washer is fitted onto the third guide pin 133 between the third interlocking rod 13 and the fourth interlocking rod 14 to reduce relative sliding friction. However, it should be noted that the third interlocking rod 13 and the fourth interlocking rod 14 are not limited to a stacked arrangement; they can also be arranged side-by-side and use their own guide pins, achieving the same technical objective of the invention.

[0025] In a specific embodiment, the present invention employs the following method for the sliding fit structure between the fifth interlocking rod 15 and the fixing plate 1: two or more transverse fifth guide holes 152 are provided on the fifth interlocking rod 15; a fifth guide pin 153 located in the fifth guide holes 152 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the fifth guide pin 153 to prevent the fifth interlocking rod 15 from falling off. The left and right ends of the return spring 7 are correspondingly fixed to the fifth interlocking rod 15 and the fifth guide pin 153. This configuration of the fifth interlocking rod 15 features a simple structure, ease of implementation, and smooth sliding. Similarly, the present invention employs the following method for the sliding fit structure between the sixth interlocking rod 16 and the fixing plate 1: two or more transverse sixth guide holes 163 are provided on the sixth interlocking rod 16; a sixth guide pin 164 located in the sixth guide holes 163 is fixed on the fixing plate 1; and a flat washer and a stop are installed on the sixth guide pin 164 to prevent the sixth interlocking rod 16 from falling off.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A five-proof mechanical interlocking mechanism for a three-position upper-isolation ring main unit, characterized in that, The circuit includes a fixed plate (1) and a circuit breaker closing operation shaft (2), a circuit breaker opening operation shaft (3), a circuit breaker opening / closing indicator shaft (4), a grounding switch operation shaft (5), and a disconnecting switch operation shaft (6) mounted on the fixed plate (1) via bearings. The fixed plate (1) is also equipped with a first interlocking rod (11), a second interlocking rod (12), a third interlocking rod (13), a fourth interlocking rod (14), a fifth interlocking rod (15), and a sixth interlocking rod (16) that slide with it. A opening limit block (31) is fixed on the circuit breaker opening operation shaft (3). A circuit breaking crank arm (41) and a circuit breaking indicator plate (42) are fixed on the circuit breaker opening / closing indicator shaft (4). The first circuit breaker pin (43) and the second circuit breaker pin (44) are fixed on the arm (41) and the circuit breaker indicator plate (42), respectively. The first grounding crank arm (51) and the second grounding crank arm (52) are fixed on the grounding switch operating shaft (5). The grounding pin (53) is fixed on the second grounding crank arm (52). The isolating pin (62) is fixed on the isolating crank arm (61) of the disconnecting switch operating shaft (6). The upper and lower ends of the first interlocking rod (11) are respectively engaged with the tripping limit block (31) and the cable compartment door. The second interlocking rod (12) is provided with a first circuit breaker pin hole (121) that is elongated and engages with the first circuit breaker pin (43). The upper end of the first isolation shaft baffle (122) of the circuit breaking time-on blocking isolating switch operating shaft (6) is provided. The lower end of the second interlocking rod (12) cooperates with the cable compartment door. The lower end of the third interlocking rod (13) is provided with the third circuit breaking toggle pin. The upper end of the third interlocking rod (13) is provided with the first grounding shaft baffle (131) of the circuit breaking time-on blocking grounding switch operating shaft (5). The upper and lower ends of the fourth interlocking rod (14) are respectively cooperated with the first grounding crank arm (51) and the cable compartment door. The fifth interlocking rod (15) and the fixing plate (1) are provided with a return spring (7). The right end of the fifth interlocking rod (15) cooperates with the grounding toggle pin (53). The left end of the fifth interlocking rod (15) is provided with a grounding pin. The second isolation shaft baffle (151) of the time-blocking disconnecting switch operating shaft (6) is provided at the left end of the sixth interlocking rod (16) and is provided with an isolation pin hole (161) that cooperates with the isolation toggle pin (62) and is in the shape of an elongated strip. The second grounding shaft baffle (162) of the time-blocking grounding switch operating shaft (5) is provided at the left end of the sixth interlocking rod (16). It also includes an interlocking lever (17) that is hinged to the fixed plate (1) in the middle by a pin shaft. One end of the interlocking lever (17) is provided with a second circuit breaker pin hole (171) that cooperates with the second circuit breaker toggle pin (44) and is in the shape of an elongated strip. The other end of the interlocking lever (17) is provided with a third circuit breaker pin hole that cooperates with the third circuit breaker toggle pin and is in the shape of an elongated strip.

2. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 1, characterized in that, The first interlocking rod (11), the second interlocking rod (12), the third interlocking rod (13), the fourth interlocking rod (14), the fifth interlocking rod (15), the sixth interlocking rod (16), and the interlocking lever (17) are made of PA66+30GF material and are injection molded.

3. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 2, characterized in that, The fixed plate (1) is equipped with a grounding micro switch (8) and an isolation micro switch (9). The fourth interlocking rod (14) is provided with a stop block (141) that cooperates with the grounding micro switch (8). The left end of the sixth interlocking rod (16) cooperates with the isolation micro switch (9).

4. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, characterized in that, The first interlocking rod (11) is provided with two or more vertical first guide holes (111), and the fixing plate (1) is fixed with a first guide pin (112) in the first guide hole (111), and a flat washer and a stop are installed on the first guide pin (112).

5. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, characterized in that, The second interlocking rod (12) is provided with two or more vertical second guide holes (123), and the fixing plate (1) is fixed with a second guide pin (124) in the second guide hole (123), and a flat washer and a stop are installed on the second guide pin (124).

6. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, characterized in that, The third interlocking rod (13) is provided with two or more vertical third guide holes (132), and the fixing plate (1) is fixed with a third guide pin (133) in the third guide hole (132), and a flat washer and a stop are installed on the third guide pin (133).

7. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 6, characterized in that, The fourth interlocking rod (14) is provided with two or more vertical fourth guide holes (142), and the fixing plate (1) is fixed with a fourth guide pin (143) in the fourth guide hole (142), and a flat washer and a stop are installed on the fourth guide pin (143).

8. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 7, characterized in that, The third interlocking rod (13) is stacked on the fourth interlocking rod (14). The third guide hole (132) and part of the fourth guide hole (142) are distributed in a one-to-one correspondence. The third guide pin (133) and the fourth guide pin (143) at the corresponding positions are the same guide pin. A gasket is fitted on the third guide pin (133) between the third interlocking rod (13) and the fourth interlocking rod (14).

9. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, characterized in that, The fifth interlocking rod (15) is provided with two or more horizontal fifth guide holes (152), and the fixing plate (1) is fixed with a fifth guide pin (153) in the fifth guide hole (152). A flat washer and a stop are installed on the fifth guide pin (153); the left and right ends of the reset spring (7) are fixed on the fifth interlocking rod (15) and the fifth guide pin (153) respectively.

10. The five-proof mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, characterized in that, The sixth interlocking rod (16) is provided with two or more horizontal sixth guide holes (163), and the fixing plate (1) is fixed with a sixth guide pin (164) in the sixth guide hole (163), and a flat washer and a stop are installed on the sixth guide pin (164).

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