A switching mechanism for handling interphase faults in a dual power supply system

Abstract

The present invention discloses an on-off mechanism for handling interphase faults in a dual power supply system. By arranging a first group of single-phase switches including three switches, two single-pole double-throw switches and a second group of single-phase switches including two switches and corresponding driving mechanisms, when an interphase short circuit occurs, one faulty phase can be turned on and the other faulty phase can be connected to the ground or a common conductor at either end of the cut-off point. The invention is also convenient for use with existing screen cabinets and has important practical value.

Description

Technical Field

[0001] The invention relates to a device for switching a circuit on and off, and in particular to a switching mechanism for processing interphase faults in a dual power supply system. Background Art

[0002] At present, there are problems such as cumbersome operation, untimely, and inaccurate positioning in the handling of interphase short circuit faults in power supply systems, which affect the power supply quality. Invention patent applications 202011453631.0, invention patent applications 202011453632.5, invention patent applications 202110420475.6 and invention patents 202110420952.9 provide a method for handling interphase short circuits in power supply systems. According to this method, when an interphase short circuit occurs, one fault phase is maintained conductive and the remaining fault phases are tripped, and then the other fault phase is connected to the ground or a common wire, and then a live phase is connected to the ground or a common wire to form a closed loop with the two fault phases connected by the short circuit and generate current or current pulses, and then the controlled switch detects the current duration or the number of current pulses and trips to remove the fault. Based on the above patent application, invention patent application 202111251618.1 provides a method for handling interphase short circuit in a dual-power three-phase power system, which uses a method of manufacturing detection circuits on both sides of the fault point to cut off the interphase short circuit fault. In specific processing, it is necessary to cut off the line and maintain the conduction of a faulty phase in a panel cabinet environment, and it is also necessary to be able to ground or connect the other faulty phase to a common wire from both sides of the cut-off point, which requires a switching device that can achieve the above operations. Summary of the invention

[0003] The purpose of the present invention is to provide an on-off mechanism for handling interphase faults in a dual power supply system. The on-off mechanism can realize conduction of one faulty phase and connect the other faulty phase to the ground or a common wire at either end of the cut-off point. It is also easy to use with existing screen cabinets and has important practical value.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A switching mechanism for handling interphase faults in a dual power supply system, comprising a first group of single-phase switches, two single-pole double-throw switches, and a second group of single-phase switches, wherein the first group of single-phase switches comprises three first single-phase switches, the three first single-phase switches are all provided with a first stationary contact and a first moving contact, and the three first moving contacts are respectively driven by a first driving mechanism; the two single-pole double-throw switches each comprise a second stationary contact and a third stationary contact, a composite moving contact is provided between the second stationary contact and the third stationary contact, and the two composite moving contacts are both driven by a second driving mechanism to contact the second stationary contact. Or the third static contact is turned on; the second group of single-phase switches includes two fourth single-phase switches, and the two fourth single-phase switches are both provided with a fourth static contact and a fourth moving contact, and the two fourth moving contacts are respectively driven by a third driving mechanism; the second static contact and the third static contact of the two single-pole double-throw switches are respectively electrically connected to the first static contact and the first moving contact of the two first single-phase switches in the first group of single-phase switches; the composite moving contacts of the two single-pole double-throw switches are respectively electrically connected to the fourth static contact or the fourth moving contact of the two fourth single-phase switches of the second group of single-phase switches.

[0006] Preferably, the first static contact and the first moving contact are provided with a first arc extinguishing chamber outside, the second static contact and one end of the compound moving contact are provided with a second arc extinguishing chamber outside, the third static contact and the other end of the compound moving contact are provided with a third arc extinguishing chamber outside, and the fourth static contact and the fourth moving contact are provided with a fourth arc extinguishing chamber outside.

[0007] Preferably, one of the first single-phase switches and one of the single-pole double-throw switches are located in a first insulating sleeve, another of the first single-phase switch and another of the single-pole double-throw switch are located in a third insulating sleeve, and a third of the first single-phase switches is located in a second insulating sleeve; wiring plugs are provided on the first insulating sleeve, the second insulating sleeve and the third insulating sleeve, the first insulating sleeve, the second insulating sleeve and the third insulating sleeve are installed on a mobile platform, and the second group of single-phase switches is also installed on the mobile platform.

[0008] Preferably, the first driving mechanism includes a first transmission mechanism and a first power source, the first transmission mechanism includes three first swing rods, three first push-pull rods and three first transmission arms, one end of the first swing rod is connected to one end of the first push-pull rod, the other end of the first swing rod is connected to the first moving contact, the other end of the first push-pull rod is connected to the first transmission arm, the three first transmission arms are respectively fixed on three coaxially arranged rotating sleeves, and the three first transmission arms are respectively connected to the first power source.

[0009] Preferably, the second driving mechanism includes a second transmission mechanism and a second power source, the second transmission mechanism includes two second swing rods, two second push-pull rods and two second transmission arms, one end of the second swing rod is connected to one end of the second push-pull rod, the other end of the second swing rod is connected to the composite moving contact, the other end of the second push-pull rod is connected to the second transmission arm, and the two second transmission arms are coaxially rotatably arranged and are respectively connected to the second power source.

[0010] Preferably, the third driving mechanism includes a third transmission mechanism and a third power source, the third transmission mechanism includes two third push-pull rods and two third transmission arms, one end of the third push-pull rod is connected to the third transmission arm, the other end of the third push-pull rod is connected to the fourth moving contact, and the two third transmission arms are coaxially rotatably arranged and are respectively connected to the third power source.

[0011] Preferably, the first power source is a first spring energy storage mechanism and a first motor.

[0012] Preferably, the second power source is a second spring energy storage mechanism and a second motor.

[0013] Preferably, the third power source is a third spring energy storage mechanism and a third motor.

[0014] In the above technical solution, the first group of single-phase switches is responsible for controlling the on-off of the three-phase line, which can maintain the conduction of one faulty phase and cut off the other faulty phases. The two single-pole double-throw switches cooperate with the second group of single-phase switches to realize that two phases in the three-phase line are grounded or connected to a common wire from either end of the cut-off point, which creates conditions for manufacturing a detection circuit including a short-circuit fault point and two faulty phase wires. The device is as simple and cost-saving as possible while ensuring the realization of the above functions. It can be well adapted to the trolley switch operation of the existing panel cabinet and has important practical and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the front view of the present invention (power source omitted);

[0016] Figure 2 It is a right side view of the present invention (power source omitted);

[0017] Figure 3 It is a left view of the present invention (power source omitted, with first and third auxiliary wiring plugs);

[0018] Figure 4 It is a left side view of the present invention (without the first and third auxiliary wiring plugs);

[0019] Figure 5 It is a schematic diagram of the structure of each arc extinguishing chamber, each swinging rocker and each push-pull rod of the switching device;

[0020] Figure 6 Schematic diagram of radially arranged key holes and locking pins (unlocked);

[0021] Figure 7 Schematic diagram of radially arranged key holes and locking pins (locked);

[0022] Figure 8 is a cross-sectional view of a key hole arranged along the axial direction;

[0023] Fig. 9 Schematic diagram of the key hole and locking pin arranged along the axial direction (unlocked);

[0024] Fig.10 This is the wiring schematic diagram of the present invention in a three-phase circuit (A L , B L , C L Indicates the left side of the ABC three-phase switch device, A R , B R , C R Indicates the right side of the ABC three-phase of this on-off device);

[0025] Fig.11 is with Fig.10 Schematic diagram of the structure of the arc extinguishing chamber part of the switching device corresponding to the wiring principle (the driving mechanism is not drawn). DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0027] As shown in the accompanying drawings, the switching device includes a first group of single-phase switches 1, two single-pole double-throw switches 2 and a second group of single-phase switches 3, wherein the first group of single-phase switches 1 includes three first single-phase switches, and the three first single-phase switches include three first arc extinguishing chambers 101, 102, and 103. The three first arc extinguishing chambers are arranged in parallel horizontally, and a first static contact 1011 and a first moving contact 1012 are provided in the first arc extinguishing chamber 101, a first static contact 1021 and a first moving contact 1022 are provided in the first arc extinguishing chamber 102, and a first static contact 1031 and a first moving contact 1032 are provided in the first arc extinguishing chamber 103. The two single-pole double-throw switches are single-pole double-throw switch 201 and single-pole double-throw switch 202. The single-pole double-throw switch 201 includes a second arc extinguishing chamber 2011 and a third arc extinguishing chamber 2012. A second static contact 2015 is provided at the upper part of the second arc extinguishing chamber 2011, and a third static contact 2016 is provided at the lower part of the third arc extinguishing chamber. A composite moving contact 2017 is provided between the second arc extinguishing chamber 2011 and the third arc extinguishing chamber 2012. The composite moving contact 2017 can move up and down to selectively contact and conduct with the second static contact 2015 and the third static contact 2016. The single-pole double-throw switch 202 includes a second arc extinguishing chamber 2021 and a third arc extinguishing chamber 2022. A second static contact 2025 is provided at the upper part of the second arc extinguishing chamber 2021, a third static contact 2026 is provided at the lower part of the third arc extinguishing chamber, and a composite moving contact 2027 is provided between the second arc extinguishing chamber and the third arc extinguishing chamber. The composite moving contact 2027 can move up and down to selectively contact and conduct with the second static contact 2025 and the third static contact 2026. The second group of single-phase switches 3 includes two fourth single-phase switches, and the two fourth single-phase switches include two fourth arc extinguishing chambers 301 and 302. A fourth static contact 3011 and a fourth moving contact 3012 are provided in the fourth arc extinguishing chamber 301, and a fourth static contact 3021 and a fourth moving contact 3022 are provided in the fourth arc extinguishing chamber 302.

[0028] The second stationary contact 2015 and the third stationary contact 2016 of the single-pole double-throw switch 201 are connected in parallel to the first stationary contact 1011 and the first moving contact 1012 via wires, the compound moving contact 2017 is electrically connected to the fourth moving contact 3012, and the fourth stationary contact 3011 is used to be connected to the ground or a common wire (or the compound moving contact 2017 is electrically connected to the fourth stationary contact 3011, and the fourth moving contact 3012 is used to be connected to the ground or a common wire). The second static contact 2025 and the third static contact 2026 of the single-pole double-throw switch 202 are connected in parallel to the first static contact 1031 and the first moving contact 1032 via wires, the composite moving contact 2027 is electrically connected to the fourth moving contact 3022, and the fourth static contact 3021 is used to be connected to the earth or a common wire (or the composite moving contact 2027 is electrically connected to the fourth static contact 3021, and the fourth moving contact 3022 is used to be connected to the earth or a common wire). In a preferred embodiment, the fourth static contact 3011 and the fourth static contact 3021 share a copper bar 3029 for grounding. In a preferred implementation, a first auxiliary wiring plug 403 is provided below the first insulating sleeve 4, the first auxiliary wiring plug 403 is electrically connected to the third static contact 2016, and is used to be electrically connected to the first static contact 1011 from the outside, and the first moving contact 1012 is electrically connected to the second static contact 2015. The third insulating sleeve 6 is further provided with a third auxiliary wiring plug 603, which is electrically connected to the third static contact 2016 and is used to be electrically connected to the first static contact 1031 from the outside, and the first moving contact 1032 is electrically connected to the second static contact 2025. In another embodiment, the first auxiliary wiring plug and the third auxiliary wiring plug are not provided, but the two third static contacts are electrically connected to the two first static contacts from the inside of the insulating sleeve, and the second static contact is electrically connected to the corresponding two first moving contacts.

[0029] The first arc extinguishing chamber 101 and the single-pole double-throw switch 201 are arranged up and down and installed in the first insulating sleeve 4, the first arc extinguishing chamber 102 is installed in the second insulating sleeve 5, and the first arc extinguishing chamber 103 and the single-pole double-throw switch 202 are arranged up and down and installed in the third insulating sleeve 6. The first insulating sleeve 4 is also provided with two first wiring plugs 401 and 402, and the first wiring plugs 401 and 402 are respectively used for connecting to connect the moving and static contacts of the first arc extinguishing chamber 101 to one phase of the three-phase line. The second insulating sleeve 5 is also provided with two second wiring plugs 501 and 502, and the second wiring plugs 501 and 502 are respectively used for connecting to connect the moving and static contacts of the first arc extinguishing chamber 102 to the second phase of the three-phase line. The third insulating sleeve 6 is also provided with two third wiring plugs 601 and 602, and the third wiring plugs 601 and 602 are respectively used for connecting to connect the moving and static contacts of the first arc extinguishing chamber 103 to the third phase of the three-phase line. The first insulating sleeve 4, the second insulating sleeve 5 and the third insulating sleeve 6 are all installed on the mobile platform 7. A rotating wheel 81 is installed under the mobile platform 7, which can be installed on the screen cabinet and pushed and pulled, so that the above-mentioned wiring plugs can be inserted into the corresponding screen cabinet wiring sockets.

[0030] The second group of single-phase switches 3 is supported and installed on the mobile platform 7 via the insulating support seat 300. The fourth static contact 3011 and the fourth static contact 3021 are connected to the fourth wiring plug 8 via the common copper bus 3029. The fourth wiring plug 8 can be plugged into the grounding wire socket of the screen cabinet.

[0031] The three first moving contacts of the first group of single-phase switches 1, the two composite moving contacts of the single-pole double-throw switch 2, and the two fourth moving contacts of the second group of single-phase switches 3 can all be controlled separately by a common spring energy storage mechanism. For example, the spring energy storage mechanism can be used to drive the moving contact and the static contact to separate and thus cut off the circuit. The motor can also be used to drive the moving contact and the static contact to contact and thus conduct the circuit.

[0032] As a preferred embodiment, the present invention uses a first transmission mechanism and a first power source to respectively drive the three first moving contacts 1012, 1022, and 1032. The first transmission mechanism includes a first rotating sleeve 13 disposed transversely on the bracket 11, a second rotating sleeve 14 is coaxially disposed outside the first rotating sleeve 13, and a third rotating sleeve 15 is coaxially disposed outside the second rotating sleeve 14. The first transmission arm 19 is V-shaped and the middle part is fixedly installed on the first rotating sleeve 13. One end of the first transmission arm 19 is connected to the first power source (not shown in the figure), and the other end is connected to one end of the first push-pull rod 16. The other end of the first push-pull rod 16 is connected to one end of the first swing rocker 17. The middle of the first swing rocker 17 is installed on the rotating shaft 18, and the rotating shaft 18 is fixed on the bracket 11. The other end of the first swing rocker 17 is slidably connected to the first moving contact 1012 through a strip hole. In this way, when the first power source presses down on one end of the first transmission arm 19, the first transmission arm 19 drives the first rotating sleeve to rotate and the other end of the first transmission arm 19 to rotate upward, while pulling the first push-pull rod 16 to move upward, thereby causing the first rocker 17 to rotate and pull the first moving contact 1012 down to separate the first moving contact 1012 from the first static contact 1011. Similarly, the first moving contact 1022 is also driven by another separately arranged first power source, the first transmission arm 20, the first push-pull rod 21 and the corresponding first swing rocker, and the first moving contact 1032 is also driven by a separately arranged third first power source, the first transmission arm 22, the first push-pull rod 23 and the corresponding first swing rocker. In this way, the first group of single-phase switches can perform phase-by-phase on-off control. The first power source is a spring energy storage mechanism and a motor drive mechanism commonly used in the prior art, or an electromagnetic energy storage mechanism and a motor mechanism.

[0033] Furthermore, in a specific embodiment, the first rotating sleeve 13, the second rotating sleeve 14 and the third rotating sleeve 15 have a key hole 24 on one side. When the key hole 24 is inserted into the locking pin 26, the three sleeves can be locked together and move synchronously, so that synchronous disconnection or synchronous closing can be ensured in daily power supply and power failure operations. The locking pin 26 can be inserted or removed by the electromagnetic locking mechanism 89 ( Figure 6 and Figure 7 The key hole 24 may also be provided on the side of the end portion, and the locking pin may be inserted from the side along the axis ( Figure 8 , Fig. 9 ).

[0034] In one embodiment, the present invention uses a second transmission mechanism and a second power source to drive two composite moving contacts. The second transmission mechanism includes a support shaft 25 disposed transversely on the bracket 11, a second transmission arm 27 is V-shaped and rotatably mounted on the support shaft 25, one end of the second transmission arm 27 is connected to a second power source (not shown in the figure), and the other end is connected to one end of a second push-pull rod 28, the other end of the second push-pull rod 28 is connected to one end of a second swing rocker 29, the middle of the second swing rocker 29 is mounted on a rotating shaft 30, the rotating shaft 30 is fixed to the bracket 11, and the other end of the second swing rocker 29 is slidably rotatably connected to the composite moving contact 2017 through a strip hole, so that when the second power source presses down one end of the second transmission arm 27, the second transmission arm 27 rotates around the support shaft 25 and the other end of the second transmission arm 27 rotates upward, while pulling the second push-pull rod 28 to move upward, thereby rotating the second swing rocker 29 and pulling the composite moving contact 2017 downward, so that the composite moving contact 2017 is separated from the second static contact and contacts the third static contact. Similarly, the composite moving contact 2027 is also driven by another separately arranged second power source, a second transmission arm, a second push-pull rod and a corresponding second swing rocker. The second power source is a spring energy storage mechanism and a motor drive mechanism, or an electromagnetic energy storage mechanism and a motor mechanism commonly used in the prior art.

[0035] In one embodiment, the present invention uses a third transmission mechanism and a third power source to drive the second group of single-phase switches. The third transmission mechanism includes a support shaft 31 arranged horizontally on the bracket 11, a third transmission arm 33 is V-shaped and the middle part is rotatably mounted on the support shaft 31, one end of the third transmission arm 33 is connected to the third power source (not shown in the figure), and the other end is connected to one end of the third push-pull rod 34, and the other end of the third push-pull rod 34 is connected to the fourth moving contact 3012. When the third power source presses down one end of the third transmission arm 33, the other end of the third transmission arm 33 rotates upward, and at the same time pulls the third push-pull rod 34 to move upward, thereby pulling up the fourth moving contact 3012 so that the fourth moving contact 3012 is separated from the fourth static contact. When the third power source pulls up the third transmission arm, the fourth moving contact can be brought into contact with the fourth static contact. The other moving contact 3022 also adopts the same driving method. The third power source is a spring energy storage mechanism and a motor drive mechanism commonly used in the prior art, or an electromagnetic energy storage mechanism and a motor mechanism.

[0036] The accompanying drawings show a circuit connection principle diagram and a working state principle diagram when the on-off device is installed in a dual power supply system, indicating that the on-off device can maintain the conduction of a faulty phase and cut off the remaining faulty phases, and can also ground the cut-off faulty phase from either end of the cut-off point, so that it can be used to deal with phase-to-phase short circuits in dual power supply systems (the specific processing method can refer to invention patent application 2021112516181).

[0037] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A switching mechanism for handling interphase faults in a dual power supply system, comprising a first set of single-phase switches, two single-pole double-throw switches and a second set of single-phase switches, characterized in that: The first group of single-phase switches includes three first single-phase switches, the three first single-phase switches are all provided with a first static contact and a first moving contact, the first static contact and the first moving contact are provided with a first arc extinguishing chamber, and the three first moving contacts are respectively driven by a first driving mechanism; the two single-pole double-throw switches each include a second static contact and a third static contact, a composite moving contact is provided between the second static contact and the third static contact, a second arc extinguishing chamber is provided outside one end of the second static contact and the composite moving contact, a third arc extinguishing chamber is provided outside the other end of the third static contact and the composite moving contact, and the two composite moving contacts are driven by a second driving mechanism to conduct with the second static contact or the third static contact; the second group of single-phase switches includes two fourth single-phase switches, the two fourth single-phase switches are all provided with a fourth static contact and a fourth moving contact, the fourth static contact and the fourth moving contact are provided with a fourth arc extinguishing chamber, and the two fourth moving contacts are respectively driven by a third driving mechanism; The second stationary contact and the third stationary contact of the two single-pole double-throw switches are respectively connected to the first stationary contact and the first moving contact of the two first single-phase switches in the first group of single-phase switches; the composite moving contact of the two single-pole double-throw switches is respectively connected to the fourth stationary contact or the fourth moving contact of the two fourth single-phase switches in the second group of single-phase switches; One of the first single-phase switches and one of the single-pole double-throw switches are located in a first insulating sleeve, another of the first single-phase switch and another of the single-pole double-throw switch are located in a third insulating sleeve, and a third of the first single-phase switches is located in a second insulating sleeve; wiring plugs are provided on the first insulating sleeve, the second insulating sleeve and the third insulating sleeve, the first insulating sleeve, the second insulating sleeve and the third insulating sleeve are installed on a mobile platform, and the second group of single-phase switches is also installed on the mobile platform.

2. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The first driving mechanism includes a first transmission mechanism and a first power source. The first transmission mechanism includes three first swing rods, three first push-pull rods and three first transmission arms. One end of the first swing rod is connected to one end of the first push-pull rod, the other end of the first swing rod is connected to the first moving contact, and the other end of the first push-pull rod is connected to the first transmission arm. The three first transmission arms are respectively fixed on three coaxially arranged rotating sleeves, and the three first transmission arms are respectively connected to the first power source.

3. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The second driving mechanism includes a second transmission mechanism and a second power source, and the second transmission mechanism includes two second swing rods, two second push-pull rods and two second transmission arms. One end of the second swing rod is connected to one end of the second push-pull rod, and the other end of the second swing rod is connected to the composite moving contact, and the other end of the second push-pull rod is connected to the second transmission arm. The two second transmission arms are coaxially rotatable and are respectively connected to the second power source.

4. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The third driving mechanism includes a third transmission mechanism and a third power source. The third transmission mechanism includes two third push-pull rods and two third transmission arms. One end of the third push-pull rod is connected to the third transmission arm, and the other end of the third push-pull rod is connected to the fourth moving contact. The two third transmission arms are coaxially rotatable and respectively connected to the third power source.

5. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 2, characterized in that: The first power source is a first spring energy storage mechanism and a first motor.

6. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 3, characterized in that: The second power source is a second spring energy storage mechanism and a second motor.

7. The on-off mechanism for handling interphase faults in a dual power supply system according to claim 4, characterized in that: The third power source is a third spring energy storage mechanism and a third motor.

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