A line protection device for a traction substation

Abstract

The application discloses a line protection device for traction substation, which comprises a base, a wiring post, a center connecting piece, a protection device, a support frame and a connecting shaft body. The base bears the whole device and is fixed in the circuit, and a protection shell is arranged on the top of the base. The wiring post is fixed at both ends of the base. The center connecting piece is fixed at the top center of the base, and a center joint is arranged in the center connecting piece. The protection device is arranged between the wiring post and the center connecting piece. The support frame is symmetrically arranged with two support frames fixed at both ends of the protection device and fixed at the bottom of the base. The connecting shaft body is linearly arranged with multiple connecting shaft bodies respectively connected with the protection device and the wiring post and connected with the protection device and the center connecting piece. Compared with the prior art, the line protection device can switch the protection device after repairing the line fault, reconnect the line, timely recover the circuit operation, and timely cut off the power supply when the line is short-circuited or overloaded, so that the fire safety hazard can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of line protection, and more particularly to a line protection device for a traction substation. Background Art

[0002] A traction substation is a location where electrical energy sent from a power plant via power transmission lines is converted into a voltage suitable for rolling stock and distributed to the contact network or contact rails. Existing substation line protection and control devices can only be powered down after a fault occurs, waiting for maintenance personnel to arrive for repairs. This requires a long power outage and cannot automatically reconnect and restore the line in a timely manner after repairs, affecting the normal operation of the equipment. Existing line protection devices lack short-circuit and overload protection. If poor insulation between the positive and negative lines causes a short circuit or leakage, it can further lead to a fire in this line, posing a wiring fire safety hazard. Therefore, it is necessary to provide a line protection device for traction substations to address the problems raised in the above background technology. Summary of the Invention

[0003] To achieve the above-mentioned object, the present invention provides the following technical solution: a line protection device for a traction substation, comprising:

[0004] The base, which carries the entire device, is fixed in the circuit and has a protective shell on the top;

[0005] There are two symmetrically distributed binding posts, fixed at both ends of the base, namely the left binding post and the right binding post;

[0006] A central connecting piece is fixed to the top center of the base and has a central joint inside;

[0007] Protection devices are symmetrically distributed in two groups, namely a first protection device and a second protection device, the first protection device is arranged between the left terminal and the central connector, and the second protection device is arranged between the right terminal and the central connector;

[0008] Two support frames are symmetrically distributed and fixed at both ends of the protective device, with the bottom fixed on the base;

[0009] The connecting shafts are provided with a plurality of connecting shafts distributed in a straight line, respectively connecting the protection device and the terminal, and connecting the protection device and the central connecting piece.

[0010] Furthermore, preferably, a drive motor and an inductance detection module are internally provided in the base. The drive motor provides a power source for the protection device, and the inductance detection module provides real-time monitoring of circuit operation. The inductance detection module detects the current in the circuit in real time. When a circuit fault occurs, the protection device is disconnected due to the current in the circuit. After the circuit fault is repaired, the inductance detection module detects that the current has returned to normal and controls the drive motor, which in turn switches the protection device, reconnecting the circuit and promptly restoring circuit operation.

[0011] Furthermore, preferably, the protection device includes:

[0012] Adjustment locking components, two groups are symmetrically distributed and slidably connected to the connecting shaft;

[0013] A switching assembly is engaged with the adjustment locking assembly and is fixed to the support frame;

[0014] There are two symmetrically distributed connectors fixed on the switching assembly;

[0015] The fuse has two ends fixedly connected to the corresponding connectors on the switching assembly;

[0016] The connecting cable is symmetrically arranged with the fuse, with both ends fixedly connected to the connector. The fuses and connecting cables in the two sets of protection devices are in different positions. That is, under the action of the switching component, the fuse and connecting cable are connected to the adjustment locking component through the connector, and then the two ends are connected to the cable through the terminal posts, forming a closed loop. When a fault occurs in the line, the fuse itself melts under the influence of the current, disconnecting the line to protect the safety of the equipment and prevent fires caused by unstable current. After the line is repaired, the inductance detection module detects that the current in the line is normal. By rotating the switching component, the fuse and connecting cable in each protection device are swapped, the line is reconnected, and the line operation is restored in a timely manner. When the line is operating normally, the blown fuse can be replaced to facilitate response to the next fault, avoiding long power outages that affect the normal operation of the line.

[0017] Furthermore, as a preference, the adjustment locking assembly includes:

[0018] The telescopic interface is provided in the connecting shaft body, and one end is fixedly connected to the terminal;

[0019] The movable shaft body is arranged on the outside of the telescopic interface and is slidably connected to the connecting shaft body;

[0020] A locking member, the side of which is fixed to one end of the movable shaft body and the inside of which is fixedly connected to the end of the telescopic interface away from the terminal;

[0021] An adjusting mechanism is slidably disposed on the connecting shaft and fixedly connected to the moving shaft;

[0022] The first ratchet mechanism is fixed to the side of the adjustment mechanism and is fixedly connected to the drive motor in the base. Specifically, when the fuse or the connecting cable needs to be replaced, the first ratchet mechanism is rotated by the drive motor, thereby adjusting the adjustment mechanism. Under the action of the adjustment mechanism, the movable shaft drives the locking member to move in the direction of the connecting shaft, thereby driving the telescopic interface to move and retract, disengaging from the joint. Then, by rotating the switching assembly, the positions of the fuse and the connecting cable are swapped. Then, the first ratchet mechanism is rotated again. Under the action of the adjustment mechanism, the movable shaft drives the locking member to move in the direction of the joint, thereby connecting the telescopic interface to the joint, forming a complete circuit.

[0023] Furthermore, preferably, the adjustment mechanism includes:

[0024] The rotating surface is slidably connected to the movable shaft and is kept in a fixed position by a first ratchet mechanism;

[0025] A plurality of rollers are provided in an annular distribution and are rollingly arranged on the side of the rotating surface;

[0026] The limiting surface is arranged opposite to the roller and fixed on the moving shaft;

[0027] The adjusting arc block corresponds to the roller and is fixed to the limiting surface. That is, under the action of the first ratchet mechanism, the rotating surface rotates on the limiting surface via the roller, and under the action of the adjusting arc block, the limiting surface drives the movable shaft to move back and forth on the connecting shaft. When the limiting surface moves away from the rotating surface, the locking member drives the telescopic interface to separate from the joint, thereby switching the fuse and the connecting cable through the switching assembly; when the limiting surface approaches the rotating surface, the locking member drives the telescopic interface to move toward the joint, thereby fixedly connecting the fuse and the connecting cable.

[0028] Further, preferably, the first ratchet mechanism includes:

[0029] A first ratchet wheel is fixed on the rotating surface and is slidably connected to the movable shaft;

[0030] a first tooth surface, coaxially disposed with the first ratchet wheel and rotatably connected to the rotating surface;

[0031] A plurality of first non-return pawls are provided in an annular arrangement and are rotatably disposed on the first tooth surface, corresponding to the first ratchet. When the drive motor inside the base drives the first tooth surface to rotate counterclockwise, the first non-return pawl on the first tooth surface is restricted by the first ratchet, driving the first ratchet to rotate, thereby driving the rotating surface to rotate on the movable shaft. Under the action of the roller, by adjusting the restriction of the arc block, the limit surface drives the locking member to move and adjust through the movable shaft, thereby locking or releasing the fuse or connecting cable. Conversely, when the drive motor inside the base drives the first tooth surface to rotate clockwise, the first non-return pawl on the first tooth surface is not restricted by the first ratchet. At this time, only the first tooth surface rotates on the rotating surface, thereby driving the switching assembly to rotate, thereby switching the fuse and connecting cable.

[0032] Furthermore, preferably, the switching component includes:

[0033] Bearing, the outer ring is fixed on the support frame;

[0034] The center shaft is fixedly connected to the inner ring of the bearing;

[0035] a second ratchet mechanism, fixed on the central shaft, meshing with the first ratchet mechanism and having the same structure as the first ratchet mechanism;

[0036] The rotating circular surface is fixed to the central shaft and is fixedly connected to the fuse and the connecting cable through connectors. In other words, when the first tooth surface in the first ratchet mechanism rotates clockwise, the first ratchet is stationary, and the first tooth surface drives the second ratchet mechanism to rotate counterclockwise. The central shaft then rotates on the support frame through the bearing, driving the rotating circular surface to rotate, thereby switching the fuse and the connecting cable.

[0037] Further, preferably, the second ratchet mechanism includes:

[0038] a second ratchet wheel, fixed on the central shaft;

[0039] A second tooth surface is coaxially arranged with the second ratchet wheel and is rotatably arranged on the central axis;

[0040] Multiple second check pawls are annularly distributed and rotatably mounted on the second tooth surface, corresponding to the second ratchet. When the first tooth surface rotates clockwise, it drives the second tooth surface to rotate counterclockwise. Consequently, under the restraint of the second check pawl, the second ratchet drives the central shaft to rotate. This rotation of the rotating circular surface enables switching between the fuse and the connecting cable. Conversely, when the first tooth surface rotates counterclockwise, the second tooth surface rotates clockwise. At this point, the second check pawl is not restrained by the second ratchet, keeping the switching assembly stationary.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] In the present invention, by setting up two groups of protection devices, after the line fault is repaired, the inductance detection module detects that there is no error, and the protection device is switched to reconnect the line to ensure that the circuit resumes operation in time. By setting up the fuse, when the line is short-circuited or overloaded, the power is cut off in time, effectively preventing fire safety hazards. After the line is disconnected due to a short circuit or overload due to an unexpected situation, if the line is not damaged, it can be reconnected in time under the control of the control terminal. When the blown fuse is replaced, there is no need to cut off the power, which effectively improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the overall structure of a line protection device for a traction substation;

[0044] Figure 2 This is a schematic diagram of the structure of a protection device in a line protection device for a traction substation;

[0045] Figure 3 This is a schematic diagram of the structure of an adjustment locking component in a line protection device for a traction substation;

[0046] Figure 4 This is a schematic diagram of the structure of an adjustment mechanism in a line protection device for a traction substation;

[0047] Figure 5 This is a schematic diagram of the structure of a switching component in a line protection device for a traction substation;

[0048] Figure 6 This is a schematic diagram of the structure of a ratchet mechanism in a line protection device for a traction substation;

[0049] Figure 7 It is a side view of a line protection device for a traction substation;

[0050] Figure: 1, base; 2, terminal; 3, center connector; 4, first protection device; 5, second protection device; 6, support frame; 7, connecting shaft; 21, left terminal; 22, right terminal; 31, center connector; 41, adjustment lock assembly; 42, switch assembly; 43, connector; 44, fuse; 45, connecting cable; 411, telescopic interface; 412, movable shaft; 413, locking piece; 414, adjustment Mechanism; 415, first ratchet mechanism; 421, bearing; 422, center axis; 423, second ratchet mechanism; 424, rotating circular surface; 4141, rotating surface; 4142, roller; 4143, limiting surface; 4144, adjusting arc block; 4151, first ratchet; 4152, first tooth surface; 4153, first non-return pawl; 4231, second ratchet; 4232, second tooth surface; 4233, second non-return pawl. DETAILED DESCRIPTION

[0051] See also Figures 1 to 7 In an embodiment of the present invention, a line protection device for a traction substation includes:

[0052] Base 1, which carries the entire device, is fixed in the circuit and has a protective shell on the top;

[0053] Two binding posts 2 are symmetrically arranged and fixed at both ends of the base 1, namely the left binding post 21 and the right binding post 22;

[0054] The central connecting member 3 is fixed to the top center of the base 1 and has a central joint 31 inside;

[0055] Protection devices are symmetrically distributed in two groups, namely a first protection device 4 and a second protection device 5. The first protection device 4 is arranged between the left terminal 21 and the central connector 3, and the second protection device 5 is arranged between the right terminal 22 and the central connector 3;

[0056] Two support frames 6 are symmetrically distributed and fixed at both ends of the protective device, with the bottom fixed on the base 1;

[0057] There are multiple connecting shafts 7 distributed in a straight line, which respectively connect the protection device and the terminal 2, and connect the protection device and the central connecting piece 3.

[0058] In this embodiment, the base 1 is internally equipped with a drive motor and an inductance detection module. The drive motor provides a power source for the protection device, while the inductance detection module provides real-time monitoring of circuit operation. The inductance detection module monitors the current in the circuit in real time. When a circuit fault occurs, the current in the circuit affects the protection device and disconnects it. Once the circuit fault is repaired, the inductance detection module detects that the current has returned to normal and controls the drive motor, which in turn switches the protection device, reconnecting the circuit and promptly restoring circuit operation.

[0059] In this embodiment, the protection device includes:

[0060] Adjustment locking assembly 41, symmetrically provided with two groups, slidably connected to the connecting shaft 7;

[0061] The switching assembly 42 is engaged with the adjustment locking assembly 41 and is fixed to the support frame 6;

[0062] Two connectors 43 are symmetrically distributed and fixed on the switching assembly 42;

[0063] Fuse 44, both ends of which are fixedly connected to corresponding connectors 43 on the switching assembly 42;

[0064] Connecting cable 45 is symmetrically arranged with fuse 44, with both ends fixedly connected to connector 43. The fuses 44 and connecting cables 45 in the two sets of protective devices are located in different positions. That is, under the action of switching assembly 42, fuse 44 and connecting cable 45 are connected to adjustment lock assembly 41 via connector 43, and then both ends are connected to the cable via terminal 2, forming a closed loop. When a line fault occurs, the current affects fuse 44, causing it to melt and disconnect the line to protect equipment safety and prevent fires caused by unstable current. After the line is repaired, the inductance detection module detects that the current in the line is normal. By rotating switching assembly 42, fuse 44 and connecting cable 45 in each protective device are swapped, reconnecting the line and promptly restoring line operation. When the line is operating normally, the blown fuse 44 can be replaced to facilitate response to the next fault, avoiding prolonged power outages that affect the normal operation of the line.

[0065] In this embodiment, the adjustment locking assembly 41 includes:

[0066] The telescopic interface 411 is provided in the connecting shaft 7 and one end of the telescopic interface 411 is fixedly connected to the terminal 2;

[0067] The movable shaft 412 is arranged outside the telescopic interface 411 and is slidably connected to the connecting shaft 7;

[0068] The locking member 413 is fixed to one end of the movable shaft 412 on its side and is fixedly connected to the end of the telescopic interface 411 away from the terminal 2 on its inside;

[0069] The adjustment mechanism 414 is slidably disposed on the connecting shaft 7 and fixedly connected to the movable shaft 412;

[0070] The first ratchet mechanism 415 is fixed to the side of the adjustment mechanism 414 and is fixedly connected to the drive motor in the base 1. Specifically, when the fuse 44 or the connecting cable 45 needs to be replaced, the first ratchet mechanism 415 is rotated by the drive motor, thereby adjusting the adjustment mechanism 414. Under the action of the adjustment mechanism 414, the movable shaft 412 drives the locking member 413 to move in the direction of the connecting shaft 7, thereby driving the telescopic interface 411 to move and retract, disengaging from the connector 43. Then, by rotating the switching assembly 42, the positions of the fuse 44 and the connecting cable 45 are swapped. Then, the first ratchet mechanism 415 is rotated again. Under the action of the adjustment mechanism 414, the movable shaft 412 drives the locking member 413 to move in the direction of the connector 43, thereby connecting the telescopic interface 411 to the connector 43, forming a complete circuit.

[0071] In this embodiment, the adjustment mechanism 414 includes:

[0072] The rotating surface 4141 is slidably connected to the movable shaft 412 and is kept in a fixed position by the first ratchet mechanism 415;

[0073] A plurality of rollers 4142 are provided in an annular distribution and are arranged to roll on the side of the rotating surface 4141;

[0074] The limiting surface 4143 is arranged opposite to the roller 4142 and fixed on the movable shaft 412;

[0075] The adjusting arc block 4144 corresponds to the roller 4142 and is fixed on the limiting surface 4143. That is, under the action of the first ratchet mechanism 415, the rotating surface 4141 rotates on the limiting surface 4143 via the roller 4142. Then, under the action of the adjusting arc block 4144, the limiting surface 4143 drives the movable shaft 412 to move back and forth on the connecting shaft 7. When the limiting surface 4143 moves away from the rotating surface 4141, the locking member 413 drives the telescopic interface 411 to separate from the connector 43, thereby switching the fuse 44 and the connecting cable 45 through the switching assembly 42. When the limiting surface 4143 approaches the rotating surface 4141, the locking member 413 drives the telescopic interface 411 to move toward the connector 43, thereby fixedly connecting the fuse 44 and the connecting cable 45.

[0076] In this embodiment, the first ratchet mechanism 415 includes:

[0077] The first ratchet 4151 is fixed on the rotating surface 4141 and is slidably connected to the movable shaft 412;

[0078] The first tooth surface 4152 is coaxially arranged with the first ratchet 4151 and is rotatably connected to the rotating surface 4141;

[0079] A plurality of first non-return pawls 4153 are provided in an annular distribution and are rotatably arranged on the first tooth surface 4152 to correspond to the first ratchet wheel 4151 . When the driving motor inside the base 1 drives the first tooth surface 4152 to rotate counterclockwise, the first check pawl 4153 on the first tooth surface 4152 is restricted by the first ratchet 4151, driving the first ratchet 4151 to rotate, and then driving the rotating surface 4141 to rotate on the movable shaft 412. Under the action of the roller 4142, by adjusting the restriction of the arc block 4144, the limiting surface 4143 drives the locking piece 413 to move and adjust through the movable shaft 412, thereby locking or releasing the fuse 44 or the connecting cable 45. Conversely, when the driving motor inside the base 1 drives the first tooth surface 4152 to rotate clockwise, the first check pawl 4153 on the first tooth surface 4152 is not restricted by the first ratchet 4151. At this time, only the first tooth surface 4152 rotates on the rotating surface 4141, and then drives the switching component 42 to rotate, switching the fuse 44 and the connecting cable 45.

[0080] In this embodiment, the switching component 42 includes:

[0081] Bearing 421, outer ring is fixed on the support frame 6;

[0082] The central shaft 422 is fixedly connected to the inner ring of the bearing 421;

[0083] The second ratchet mechanism 423 is fixed on the central shaft 422 and meshes with the first ratchet mechanism 415 , and has the same structure as the first ratchet mechanism 415 ;

[0084] The rotating circular surface 424 is fixed to the central shaft 422 and is fixedly connected to the fuse 44 and the connecting cable 45 via the connector 43. In other words, when the first tooth surface 4152 in the first ratchet mechanism 415 rotates clockwise, the first ratchet 4151 is stationary, and the first tooth surface 4152 drives the second ratchet mechanism 423 to rotate counterclockwise. The central shaft 422 then rotates on the support frame 6 via the bearing 421, driving the rotating circular surface 424 to rotate, thereby switching the fuse 44 and the connecting cable 45.

[0085] In this embodiment, the second ratchet mechanism 423 includes:

[0086] A second ratchet 4231 is fixed on the central shaft 422;

[0087] The second tooth surface 4232 is coaxially arranged with the second ratchet wheel 4231 and is rotatably arranged on the central shaft 422;

[0088] Multiple second non-return pawls 4233 are provided in an annular arrangement and are rotatably mounted on the second tooth surface 4232, corresponding to the second ratchet 4231. When the first tooth surface 4152 rotates clockwise, it drives the second tooth surface 4232 to rotate counterclockwise. Consequently, under the restraint of the second non-return pawls 4233, the second ratchet 4231 drives the central shaft 422 to rotate. This, in turn, switches the fuse 44 and the connecting cable 45 by rotating the rotating circular surface 424. Conversely, when the first tooth surface 4152 rotates counterclockwise, the second tooth surface 4232 rotates clockwise. At this point, the second non-return pawls 4233 are not restrained by the second ratchet 4231, allowing the switching assembly 42 to remain stationary.

[0089] During specific implementation, first, in the initial state, the first protection device 4 of the two sets of protection devices is connected to the line through the fuse 44, and the second protection device 5 is connected to the line through the connecting cable 45. When the inductance detection module detects that the current in the line is abnormal and causes the fuse 44 to melt, a signal is sent to the control terminal at this time, and the staff performs maintenance and monitors the line in real time. When the line returns to normal, the inductance monitoring module detects that the current in the line is normal, and after receiving the instruction from the control terminal to reconnect the line, the control drive motor drives the first tooth surface 4152 to rotate counterclockwise, thereby driving the rotating surface 4141 to rotate. When the roller 4142 of the rotating surface 4141 rotates to the position of the adjustment arc block 4144 of the limit surface 4143, the limit surface 4143 is away from the rotating surface 4141. Under the action of the movable shaft 412, the locking member 413 drives the telescopic interface 411 to disengage from the connector 43. At this time, the fuse 44 and the connecting cable 45 are in a disengaged state, and then the driving motor drives the first tooth surface 4152 to rotate counterclockwise. 52 rotates clockwise, thereby driving the second tooth surface 4232 to rotate counterclockwise, that is, the second ratchet mechanism 423 rotates counterclockwise, and then the central shaft 422 rotates on the support frame 6 through the bearing 421, driving the rotating circular surface 424 to rotate, switching the blown fuse 44 in the first protection device 4 to the connecting cable 45, and switching the connecting cable 45 in the second protection device 5 to a new fuse 44, and then the driving motor drives the first tooth surface 4152 to rotate counterclockwise again, thereby driving the rotating surface 4141 to rotate. When the roller 4142 of the rotating surface 4141 rotates to the position between the adjustment arc block 4144 of the limit surface 4143, it stops rotating. At this time, the limit surface 4143 is close to the rotating surface 4141. Under the action of the movable shaft 412, the locking member 413 drives the telescopic interface 411 to connect with the connector 43, and the fuse 44 and the connecting cable 45 are fixedly connected. The line is restored, and the circuit is restored in time. The staff will subsequently replace the blown fuse 44 to prevent the next fault from occurring.

[0090] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A line protection device for a traction substation, characterized by: include: The base (1) carries the entire device and is fixed in the circuit, with a protective housing provided on the top; Two binding posts (2) are symmetrically distributed and fixed at both ends of the base (1), namely a left binding post (21) and a right binding post (22); A central connecting member (3) is fixed to the top center of the base (1) and has a central joint (31) inside; The protective device is symmetrically distributed and provided with two groups, namely a first protective device (4) and a second protective device (5), wherein the first protective device (4) is provided between the left terminal (21) and the central connecting piece (3), and the second protective device (5) is provided between the right terminal (22) and the central connecting piece (3); Two support frames (6) are symmetrically distributed and fixed to both ends of the protective device, with the bottoms fixed to the base (1); A plurality of connecting shafts (7) are linearly distributed and respectively connect the protection device and the terminal (2) and the protection device and the central connecting piece (3); The protection device comprises: Adjusting locking components (41), symmetrically distributed with two groups, slidably connected to the connecting shaft (7); A switching assembly (42) is engaged with the adjustment locking assembly (41) and is fixed to the support frame (6); Two connectors (43) are symmetrically distributed and fixed on the switching assembly (42); The fuse (44) has two ends fixedly connected to corresponding connectors (43) on the switching assembly (42); The connecting cable (45) is symmetrically arranged with the fuse (44), and both ends are fixedly connected to the connector (43), and the fuses (44) and connecting cables (45) in the two sets of protection devices are in different positions; The adjustment locking assembly (41) comprises: A telescopic interface (411) is provided in the connecting shaft (7), one end of which is fixedly connected to the terminal (2); A movable shaft (412) is arranged outside the telescopic interface (411) and is slidably connected to the connecting shaft (7); The locking member (413) is fixed on one end of the movable shaft (412) and is internally fixedly connected to the end of the telescopic interface (411) away from the terminal (2); An adjusting mechanism (414) is slidably disposed on the connecting shaft (7) and fixedly connected to the moving shaft (412); The first ratchet mechanism (415) is fixed to the side of the adjustment mechanism (414) and is fixedly connected to the drive motor in the base (1).

2. A line protection device for a traction substation according to claim 1, characterized in that: A driving motor and an inductance detection module are provided inside the base (1); the driving motor provides a power source for the protection device; and the inductance detection module provides real-time monitoring for line operation.

3. A line protection device for a traction substation according to claim 1, characterized in that: The regulating mechanism (414) comprises: The rotating surface (4141) is slidably connected to the movable shaft (412) and is kept in a fixed position by a first ratchet mechanism (415); A plurality of rollers (4142) are provided in an annular distribution and are arranged to roll on the side of the rotating surface (4141); The limiting surface (4143) is arranged opposite to the roller (4142) and is fixed on the movable shaft (412); The adjusting arc block (4144) corresponds to the roller (4142) and is fixed on the limiting surface (4143).

4. A line protection device for a traction substation according to claim 1, characterized in that: The first ratchet mechanism (415) comprises: A first ratchet (4151) is fixed on the rotating surface (4141) and is slidably connected to the movable shaft (412); A first tooth surface (4152) is coaxially arranged with the first ratchet (4151) and is rotatably connected to the rotating surface (4141); A plurality of first non-return pawls (4153) are provided in an annular distribution and are rotatably arranged on the first tooth surface (4152) and correspond to the first ratchet wheel (4151).

5. The line protection device for a traction substation according to claim 1, characterized in that: The switching component (42) includes: The outer ring of the bearing (421) is fixed on the support frame (6); A central shaft (422) is fixedly connected to the inner ring of the bearing (421); A second ratchet mechanism (423) is fixed on the central shaft (422), meshed with the first ratchet mechanism (415), and has the same structure as the first ratchet mechanism (415); The rotating circular surface (424) is fixed on the central shaft (422) and is fixedly connected to the fuse (44) and the connecting cable (45) through the connector (43).

6. A line protection device for a traction substation according to claim 5, characterized in that: The second ratchet mechanism (423) comprises: A second ratchet wheel (4231) is fixed on the central shaft (422); The second tooth surface (4232) is coaxially arranged with the second ratchet (4231) and rotatably arranged on the central axis (422); A plurality of second non-return pawls (4233) are provided in an annular distribution and are rotatably arranged on the second tooth surface (4232) to correspond to the second ratchet wheel (4231).

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