Feeder temporary isolation equipment of automatic distribution network and isolation method thereof

Abstract

The invention relates to the related technical field of feeder line isolation, in particular to feeder line temporary isolation equipment of an automatic distribution network and an isolation method thereof, the isolation equipment is arranged in a distribution box, and the isolation equipment comprises a bearing seat and a second cable and a third cable which are arranged on the bearing seat; the cable connector further comprises a first opening and closing assembly and a second clamping assembly which are arranged between the second cable and the third cable respectively, the first clamping assembly and the second opening and closing assembly can deflect relative to the bearing seat, and deflection of the first clamping assembly is controlled by a driving assembly installed on the bearing seat. The elastic triggering piece is arranged on the bearing seat and connected with the first clamping piece and the second clamping piece, and when the first opening and closing piece is controlled to be powered off, the deformation quantity generated by the elastic triggering piece is driven to act on the second opening and closing piece at the moment when the first opening and closing piece completes power failure on a second cable, so that the second cable is powered off, and the power failure of the second cable is avoided. Therefore, power supply of the third cable is quickly recovered.

Description

Technical Field

[0001] The present invention relates to the technical field of feeder isolation, and specifically to a temporary isolation device for a feeder in an automated distribution network and an isolation method therefor. Background Art

[0002] The temporary isolation function of the feeder in an automated distribution network is an important part of the distribution network automation system. Its main purpose is to quickly locate and isolate the fault area in case of a fault, thereby reducing the power outage scope and time and improving the power supply reliability. When a phase-to-phase short circuit fault or a single-phase ground fault occurs in the feeder, the feeder automation technology automatically determines the faulty section of the feeder, isolates the faulty section, and restores the power supply of the non-faulty section by monitoring and controlling the switchgear in the distribution line.

[0003] When the existing feeder in an automated distribution network conducts power supply and transmission, when the protection device monitors a fault in the feeder, it sends signals to the switchgear at both the faulty section and the non-faulty end simultaneously, resulting in the switches at both the faulty section and the non-faulty section working simultaneously. It is easy to cause the power supply of the non-faulty section to be restored before the faulty section is powered off, causing damage to the feeder, or the power supply of the non-faulty section not to be restored after the faulty section is powered off. The power outage interval reduces the overall power transportation efficiency and increases the economic loss. Summary of the Invention

[0004] The purpose of the present invention is to provide a temporary isolation device for a feeder in an automated distribution network to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A temporary isolation device for a feeder in an automated distribution network is arranged in a distribution box. The isolation device includes a receiving seat and a second cable and a third cable arranged on the receiving seat. Both ends of the second cable and the third cable are respectively connected to a first cable arranged in the distribution box; It further includes a first opening and closing component and a second engaging component respectively arranged between the second cable and the third cable. The first engaging part and the second opening and closing part can deflect relative to the receiving seat, and the deflection of the first engaging part is controlled by a driving component installed on the receiving seat; An elastic triggering part is arranged on the receiving seat and is respectively connected to the first engaging part and the second engaging part. At the moment when the first opening and closing part cuts off the power of the second cable, the first opening and closing part on the second cable quickly closes and is powered on.

[0006] The temporary isolation device for a feeder in an automated distribution network as described above: The first opening and closing part includes a first rotating shaft rotatably installed on the receiving seat, and a first knife switch is arranged along the radial direction of the first rotating shaft.

[0007] The feeder temporary isolation device for automated power distribution network as described above: The second opening and closing member includes a second rotating shaft with the rotating shaft installed on the receiving seat. The second rotating shaft is provided with a second knife switch along the radial direction, and locking members for limiting the second knife switch are symmetrically arranged on the receiving seat.

[0008] The feeder temporary isolation device for automated power distribution network as described above: The locking member includes a plug socket fixedly installed on the receiving seat. A plug rod is slidably arranged inside one end of the plug socket. A convex column is arranged along the radial direction of the plug rod at the end of the plug rod away from the plug socket. The convex column can be inserted into a chute formed on the side end of the second knife switch and is slidably connected with the chute. It further includes a second spring. The second spring is arranged inside the plug socket. One end of the second spring abuts against the inner bottom of the plug socket, and the other end abuts against the plug rod.

[0009] The feeder temporary isolation device for automated power distribution network as described above: Connection seats fixed to the receiving seat are symmetrically installed between the second cable and the third cable. The first knife switch and the second knife switch can respectively abut against the connection seats.

[0010] The feeder temporary isolation device for automated power distribution network as described above: The driving component includes an electric telescopic rod arranged obliquely. The electric telescopic rod is rotationally connected with the receiving seat through a support frame. The movable end of the electric telescopic rod is hinged to the first knife switch, and the electric telescopic rod establishes communication with a protection device installed in the distribution box.

[0011] The feeder temporary isolation device for automated power distribution network as described above: The elastic trigger member includes a fixing plate fixedly connected to the support frame. One end of the fixing plate is rotatably installed with a connecting shaft. The connecting shaft is connected to the first rotating shaft through a first belt. A rotating plate is arranged along the radial direction of the connecting shaft, and limiting blocks for limiting the rotating plate are symmetrically arranged on the side end of the fixing plate. It further includes a first spring. One end of the first spring is hinged to the fixing plate, and the other end is hinged to the rotating plate.

[0012] The feeder temporary isolation device for automated power distribution network as described above: A transmission cylinder is rotationally connected to the support frame. The transmission cylinder is arranged along the axis of the connecting shaft. The connecting shaft penetrates through the transmission cylinder. The transmission cylinder is connected to the second rotating shaft through a second belt.

[0013] The feeder temporary isolation device for automated power distribution network as described above: At least one group of arc-shaped grooves are formed on the inner wall of the transmission cylinder. A strip-shaped block is arranged on the connecting shaft and is rotationally matched with the arc-shaped grooves.

[0014] A method for isolating a feeder in an automated power distribution network, which uses the temporary isolation device for the feeder in the automated power distribution network described in any one of the above, includes the following steps: Step 1: When the protection device detects a fault in the second cable, it sends a signal to the electric telescopic rod to start the electric telescopic rod to perform work; Step 2: The lever of the electric telescopic rod contracts, causing the first knife switch to deflect. During the process of driving the rotating plate to deflect synchronously, the first spring is stretched again, and the first knife switch gradually separates from the connecting seat; Step 3: When the first knife switch is about to be completely separated from the connecting seat, the stretching amount of the first spring reaches the maximum value. When the first knife switch deflects to the moment of disengaging from the connecting seat, under the action of the first spring, the second knife switch deflects towards the connecting seat against the pressure of the locking member, so that when the second cable is powered off, the third cable quickly resumes power supply.

[0015] Compared with the prior art, the beneficial effects of the present invention are: Once the protection device detects a phase-to-phase short circuit fault or a single-phase ground fault in the second cable, by sending a signal to the drive assembly, the drive assembly drives the first opening and closing member to deflect relative to the second cable. While the first opening and closing member deflects, it drives the elastic deformation amount on the elastic trigger member to increase, so that when the first opening and closing member deflects to the moment of disengaging from the second cable, the elastic force stored in the elastic trigger member quickly squeezes the second opening and closing member to deflect relative to the third cable, ensuring that when the second cable is powered off, the third cable is quickly powered on, ensuring the normal voltage transmission work of the first cable, significantly reducing the power outage time, not only improving the power supply reliability and the level of grid intelligence, but also effectively reducing the power outage time and economic losses, and significantly improving the overall operation efficiency of the power system and the user satisfaction. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the temporary isolation device for the feeder in the automated power distribution network.

[0017] Figure 2 It is a schematic structural diagram inside the distribution box of the temporary isolation device for the feeder in the automated power distribution network.

[0018] Figure 3 It is a schematic structural diagram of the receiving seat and the support frame in the temporary isolation device for the feeder in the automated power distribution network.

[0019] Figure 4 It is a schematic structural diagram of the first opening and closing member and the second opening and closing member in the temporary isolation device for the feeder in the automated power distribution network.

[0020] Figure 5 It is a schematic structural diagram of the first cable, the second cable and the third cable in the temporary isolation device for the feeder in the automated power distribution network.

[0021] Figure 6 It is a schematic structural diagram of the second opening and closing member in the feeder temporary isolation device for automated distribution network.

[0022] Figure 7 It is a schematic structural diagram of the elastic trigger member in the feeder temporary isolation device for automated distribution network.

[0023] Figure 8 It is a schematic structural diagram of the connecting shaft and the transmission cylinder in the feeder temporary isolation device for automated distribution network.

[0024] Figure 9 It is a schematic structural diagram of the second knife switch and the locking member in the feeder temporary isolation device for automated distribution network.

[0025] In the figure: 1, distribution box; 2, receiving seat; 3, support frame; 4, first cable; 5, first knife switch; 6, first rotating shaft; 7, connecting seat; 8, second cable; 9, third cable; 10, guide plate; 11, fixing plate; 12, limiting block; 13, rotating plate; 14, first spring; 15, connecting shaft; 1501, strip-shaped block; 16, transmission cylinder; 1601, arc-shaped groove; 17, second knife switch; 1701, sliding groove; 18, inserting rod; 1801, convex column; 19, inserting sleeve; 20, second spring; 21, second rotating shaft; 22, first belt; 23, second belt; 24, electric telescopic rod. Detailed implementation manners

[0026] The following will detail various exemplary embodiments, features, and aspects of the present application with reference to the accompanying drawings. The same reference numerals in the drawings denote elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0027] The special term "exemplary" here means "serving as an example, embodiment, or illustrative". Any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments.

[0028] In addition, for a better illustration of the present application, numerous specific details are given in the following detailed embodiments. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some instances, methods, means, and elements well-known to those skilled in the art are not described in detail to highlight the gist of the present application.

[0029] Please refer to Figures 1 to 9, in the embodiment of the present invention, a feeder temporary isolation device for an automated power distribution network is provided in the distribution box 1. The isolation device includes a receiving seat 2, a second cable 8 and a third cable 9 disposed on the receiving seat 2. Both ends of the second cable 8 and the third cable 9 are respectively connected to a first cable 4 disposed in the distribution box 1; It further includes a first opening and closing assembly and a second engaging assembly respectively disposed between the second cable 8 and the third cable 9. The first engaging member and the second opening and closing member can deflect relative to the receiving seat 2, and the deflection of the first engaging member is controlled by a driving assembly installed on the receiving seat 2; An elastic trigger member is disposed on the receiving seat 2 and is respectively connected to the first engaging member and the second engaging member. At the moment when the first opening and closing member cuts off the power supply of the second cable 8, the first opening and closing member on the second cable 8 quickly closes and is energized.

[0030] Specifically, under normal power-on conditions, voltage is transmitted from the second cable 8 into the first cable 4, and the third cable 9 is in a disconnected state. Once the protection device detects an interphase short circuit fault or a single-phase ground fault in the second cable 8, it sends a signal to the driving assembly. The driving assembly drives the first opening and closing member to deflect relative to the second cable 8. While the first opening and closing member deflects, it causes the elastic deformation amount on the elastic trigger member to increase, so that at the moment when the first opening and closing member deflects to disengage from the second cable 8, the elastic force stored in the elastic trigger member quickly squeezes the second opening and closing member to deflect relative to the third cable 9, ensuring that the third cable 9 is quickly powered on at the moment when the second cable 8 is powered off, guaranteeing the normal voltage transmission work of the first cable 4, significantly reducing the power outage time, not only improving the power supply reliability and the level of grid intelligence, but also effectively reducing the power outage time and economic losses, and having a significant promoting effect on the overall operation efficiency of the power system and user satisfaction.

[0031] It should be noted that: under normal circumstances, power is supplied by the first cable 4 and the second cable 8. Once a fault occurs in the second cable 8, the protection device sends a signal to the electric telescopic rod 24 to cut off the power supply of the second cable 8 and restore the power supply of the third cable 9. During the repair of the second cable 8, power is supplied by the first cable 4 and the third cable 9.

[0032] As a further solution of the present invention, please refer to Figure 6 , the first opening and closing member includes a first rotating shaft 6 rotatably installed on the receiving seat 2, and a first knife switch 5 is arranged along the radial direction of the first rotating shaft 6.

[0033] The second opening and closing member includes a second rotating shaft 21 rotatably installed on the receiving seat 2. A second knife switch 17 is arranged along the radial direction of the second rotating shaft 21, and locking members for limiting the second knife switch 17 are symmetrically arranged on the receiving seat 2.

[0034] Preferably, connection seats 7 fixed to the receiving seat 2 are symmetrically installed between the second cable 8 and the third cable 9, and the first knife switch 5 and the second knife switch 17 can respectively abut against the connection seats 7.

[0035] Under normal power supply conditions, the first knife switch 5 is in an abutting state with the connection seat 7 on the second cable 8, while the second knife switch 17 is in a separated state from the connection seat 7 on the third cable 9. Once the protection device detects a power supply failure in the second cable 8, it sends a signal to the driving assembly. Under the action of the elastic triggering member, when the second cable 8 loses power instantaneously, the power supply of the third cable 9 can be quickly restored, further reducing the power outage time.

[0036] Preferably, the connection seat 7 is made of conductive copper. The gap between the two connection seats 7 is for the first knife switch 5 or the second knife switch 17 to move. When the first knife switch 5 is located between the connection seats 7, the second cable 8 is in a normal power supply state. The moment the first knife switch 5 is completely separated from the connection seat 7, the second knife switch 17 deflects to abut against the connection seat 7 to restore the normal power supply of the third cable 9, and at this time the second cable 8 loses power.

[0037] As a further solution of the present invention, please refer to Figure 9 , the locking member includes a socket sleeve 19 fixedly installed on the receiving seat 2. A socket rod 18 is slidably arranged inside one end of the socket sleeve 19. A convex column 1801 is arranged along the radial direction of the socket rod 18 at the end of the socket rod 18 away from the socket sleeve 19. The convex column 1801 can be inserted into a chute 1701 formed on the side end of the second knife switch 17 and is slidably connected with the chute 1701; It further includes a second spring 20. The second spring 20 is arranged inside the socket sleeve 19. One end of the second spring 20 abuts against the inner bottom of the socket sleeve 19, and the other end abuts against the socket rod 18.

[0038] As a further solution of the present invention, please refer to Figure 4 , the driving assembly includes an electric telescopic rod 24 arranged obliquely. The electric telescopic rod 24 is rotatably connected to the receiving seat 2 through a support frame 3. The movable end of the electric telescopic rod 24 is hinged to the first knife switch 5, and the electric telescopic rod 24 communicates with a protection device installed in the distribution box 1.

[0039] Preferably, a guide plate 10 for guiding the deflection of the first knife switch 5 is arranged on the receiving seat 2.

[0040] As a further solution of the present invention, please refer to the figure. The elastic trigger member includes a fixing plate 11 fixedly connected to the support frame 3. One end of the fixing plate 11 is rotatably installed with a connecting shaft 15. The connecting shaft 15 is connected to the first rotating shaft 6 through a first belt 22. A rotating plate 13 is arranged radially along the connecting shaft 15, and limiting blocks 12 for limiting the rotating plate 13 are symmetrically arranged at the side end of the fixing plate 11. It further includes a first spring 14. One end of the first spring 14 is hinged to the fixing plate 11, and the other end is hinged to the rotating plate 13.

[0041] Specifically, once the protection device detects a fault in the second cable 8, the protection device sends a signal to the electric telescopic rod 24. After receiving the signal, the electric telescopic rod 24 starts to work. When the lever of the electric telescopic rod 24 contracts, the first knife switch 5 is subjected to a pulling force and deflects relative to the connecting seat 7, so that the first knife switch 5 gradually disengages from the connecting seat 7. When the first knife switch 5 deflects, it drives the first rotating shaft 6 to rotate synchronously. Under the action of the first belt 22, the requirement for the rotation of the connecting shaft 15 is realized to drive the rotating plate 13 to deflect and change the stretching amount of the first spring 14.

[0042] In the initial state, the first spring 14 is in a stretched state. At this time, the first spring 14 generates a counterclockwise rotational force on the rotating plate 13. Under the action of the limiting block 12, the rotating plate 13 cannot rotate. When the above-mentioned connecting shaft 15 rotates, it drives the connecting shaft 15 to rotate reversely against the pulling force of the first spring 14, increasing the stretching amount of the first spring 14. When the first knife switch 5 deflects to be about to separate from the connecting seat 7, at this time, the rotating plate 13 and the fixing plate 11 are on the same horizontal line, and the forces between the rotating plate 13 and the fixing plate 11 are balanced. At this time, the stretching amount of the first spring 14 is at the maximum value. When the first knife switch 5 continues to deflect until it completely disengages from the connecting seat 7, under the elastic force of the first spring 14, it drives the second knife switch 17 to deflect quickly, ensuring that when the second cable 8 is powered off instantaneously, the third cable 9 resumes power supply work.

[0043] As a further solution of the present invention, please refer to the figure. A transmission cylinder 16 is rotatably connected to the support frame 3. The transmission cylinder 16 is arranged along the axis of the connecting shaft 15. The connecting shaft 15 passes through the transmission cylinder 16, and the transmission cylinder 16 is connected to the second rotating shaft 21 through a second belt 23.

[0044] Preferably, at least one set of arc-shaped grooves 1601 are formed on the inner wall of the transmission cylinder 16, and strip-shaped blocks 1501 that are rotationally matched with the arc-shaped grooves 1601 are arranged on the connecting shaft 15.

[0045] Specifically, when the first rotating shaft 6 rotates, under the action of the first belt 22, the connecting shaft 15 is driven to rotate synchronously. At this time, the strip-shaped block 1501 is in a separated state from the side wall of the arc-shaped groove 1601. When the first switch blade 5 deflects to be about to separate from the connecting seat 7 and the rotating plate 13 and the fixed plate 11 are on the same horizontal line, the strip-shaped block 1501 is in a butting state with the side wall of the arc-shaped groove 1601. Subsequently, under the action of the first spring 14, the connecting shaft 15 rotates rapidly to drive the transmission cylinder 16 to rotate accordingly, overcoming the elastic force of the second spring 20 itself, and the second switch blade 17 deflects rapidly to abut against the connecting seat 7, ensuring that when the second cable 8 is powered off instantaneously, the third cable 9 resumes power supply work.

[0046] A feeder isolation method for an automated distribution network, using the feeder temporary isolation device for an automated distribution network described in any one of the above, includes the following steps: Step 1: When the protection device detects a fault in the second cable 8, it sends a signal to the electric telescopic rod 24 to start the electric telescopic rod 24 to perform work; Step 2: The lever of the electric telescopic rod 24 contracts, causing the first switch blade 5 to deflect. During the process of driving the rotating plate 13 to deflect synchronously, the first spring 14 is stretched again, and the first switch blade 5 gradually separates from the connecting seat 7; Step 3: When the first switch blade 5 is about to be completely separated from the connecting seat 7, the stretching amount of the first spring 14 is at the maximum value. When the first switch blade 5 deflects to be separated from the connecting seat 7 instantaneously, under the action of the first spring 14, the second switch blade 17 deflects towards the connecting seat 7 against the pressure of the locking member, so that when the second cable 8 is powered off instantaneously, the third cable 9 resumes power supply rapidly.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A feeder temporary isolation device for an automated distribution network, arranged in a distribution box (1), characterized in that: The isolation device comprises a receiving seat (2) and a second cable (8) and a third cable (9) arranged on the receiving seat (2), wherein two ends of the second cable (8) and the third cable (9) are respectively connected to a first cable (4) arranged in the distribution box (1); It also comprises a first opening and closing component and a second clamping component respectively arranged between the second cable (8) and the third cable (9), the first clamping component and the second opening and closing component being capable of deflecting relative to the receiving seat (2), and the deflection of the first clamping component being controlled by a driving component installed on the receiving seat (2); An elastic triggering member is arranged on the receiving seat (2) and is respectively connected to the first engaging member and the second engaging member. At the moment when the first opening and closing member cuts off the power to the second cable (8), the first opening and closing member on the second cable (8) quickly closes and turns on the power.

2. The feeder temporary isolation device for an automated distribution network according to claim 1, characterized in that: The first opening and closing member comprises a first rotating shaft (6) rotatably mounted on the receiving seat (2), and the first rotating shaft (6) is provided with a first knife gate (5) along the radial direction.

3. The feeder temporary isolation device for an automated distribution network according to claim 2, characterized in that: The second opening and closing member comprises a second rotating shaft (21) which is mounted on the receiving seat (2), the second rotating shaft (21) being provided with a second knife gate (17) in a radial direction, and locking members for limiting the position of the second knife gate (17) are symmetrically provided on the receiving seat (2).

4. The feeder temporary isolation device for an automated distribution network according to claim 3, characterized in that: The locking member comprises a plug sleeve (19) fixedly mounted on the receiving seat (2), a plug rod (18) being slidably arranged in one end of the plug sleeve (19), a boss (1801) being arranged in the radial direction of the plug rod (18) at one end of the plug rod (18) away from the plug sleeve (19), and the boss (1801) being capable of being inserted into a slide groove (1701) formed at a side end of the second knife switch (17) and being slidably connected to the slide groove (1701); It also includes a second spring (20), which is arranged in the plug sleeve (19), one end of the second spring (20) abuts against the inner bottom of the plug sleeve (19), and the other end of the second spring (20) abuts against the plug rod (18).

5. The feeder temporary isolation device for an automated distribution network according to claim 3, characterized in that: A connecting seat (7) fixed to the receiving seat (2) is symmetrically installed between the second cable (8) and the third cable (9), and the first knife switch (5) and the second knife switch (17) can respectively abut against the connecting seat (7).

6. The feeder temporary isolation device for an automated distribution network according to claim 3, characterized in that: The driving assembly comprises an electric telescopic rod (24) arranged in an inclined manner, the electric telescopic rod (24) being rotatably connected to the receiving seat (2) via a support frame (3), the movable end of the electric telescopic rod (24) being hinged to the first knife switch (5), and the electric telescopic rod (24) establishing communication with a protective device installed in the distribution box (1).

7. The feeder temporary isolation device for an automated distribution network according to claim 6, characterized in that: The elastic trigger member comprises a fixed plate (11) fixedly connected to the support frame (3); a connecting shaft (15) is rotatably mounted on one end of the fixed plate (11); the connecting shaft (15) is connected to the first rotating shaft (6) via a first belt (22); a rotating plate (13) is arranged along the radial direction of the connecting shaft (15); and a limiting block (12) for limiting the position of the rotating plate (13) is symmetrically arranged at the side end of the fixed plate (11); It also comprises a first spring (14), one end of the first spring (14) being hinged to the fixed plate (11), and the other end of the first spring (14) being hinged to the rotating plate (13).

8. The feeder temporary isolation device for an automated distribution network according to claim 7, characterized in that: A transmission cylinder (16) is rotatably connected to the support frame (3); the transmission cylinder (16) is arranged along the axis of the connecting shaft (15); the connecting shaft (15) passes through the transmission cylinder (16); and the transmission cylinder (16) is connected to the second rotating shaft (21) via a second belt (23).

9. The feeder temporary isolation device for an automated distribution network according to claim 8, characterized in that: At least one group of arc-shaped grooves (1601) is formed on the inner wall of the transmission cylinder (16), and a strip block (1501) rotatably matched with the arc-shaped grooves (1601) is provided on the connecting shaft (15).

10. A feeder isolation method for an automated distribution network, characterized in that: The feeder temporary isolation device of the automated distribution network as described in any one of claims 1 to 9 comprises the following steps: Step 1: When the protection device detects that the second cable (8) is faulty, it sends a signal to the electric telescopic rod (24) to start the electric telescopic rod (24) to perform work; Step 2: The lever of the armature telescopic rod (24) contracts, causing the first knife switch (5) to deflect, driving the rotating plate (13) to deflect synchronously, and the first spring (14) is stretched again, so that the first knife switch (5) gradually separates from the connecting seat (7); Step 3: When the first knife switch (5) is about to be completely separated from the connecting seat (7), the stretching amount of the first spring (14) is at its maximum value, so that the first knife switch (5) is deflected to the moment of being separated from the connecting seat (7). Under the action of the first spring (14), the second knife switch (17) overcomes the pressure of the locking member and deflects toward the connecting seat (7), so that the third cable (9) can quickly restore power supply when the second cable (8) is powered off.

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