A pole-mounted on-off mechanism for handling interphase faults in a dual power supply system

Abstract

The present invention discloses a pole-mounted on-off mechanism for handling interphase faults in a dual-power supply system. By arranging a first switch group containing three single-phase switches, a second switch group containing two single-pole double-throw switches, and a fourth switch group containing two single-phase 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 a cut-off point. The invention is also convenient to use on a pole and has important practical value.

Description

Technical Field

[0001] The invention relates to a device for switching a circuit on and off, in particular to a switching mechanism used on a pole for handling 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 remove the interphase short circuit fault. In specific processing, it is necessary to cut off the line on the power pole and maintain the conduction of one faulty phase, and it is also necessary to realize the operation of grounding or connecting the other faulty phase to the common wire from both sides of the cut-off point, which requires a switching device that can realize the above operations. Summary of the invention

[0003] The purpose of the present invention is to provide a pole-mounted 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. The device has a simple structure and is easy to use on the pole, and has important promotion value.

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

[0005] A pole-mounted on-off mechanism for handling interphase faults in a dual power supply system, comprising a first switch group, a second switch group and a fourth switch group arranged in layers, wherein the first switch group comprises three first single-phase switches arranged in parallel on the same layer, the second switch group comprises two single-pole double-throw switches arranged in parallel on the same layer, the fourth switch group comprises two fourth single-phase switches arranged in parallel on the same layer, the three first single-phase switches each comprise a first static contact and a first moving contact, the three first moving contacts are respectively driven by three first drive shafts arranged coaxially; the two single-pole double-throw switches each comprise 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, and the two composite moving contacts are respectively driven by two coaxially arranged second drive shafts; the two fourth single-phase switches each include a fourth static contact and a fourth moving contact, and the two fourth moving contacts are respectively driven by two coaxially arranged fourth drive shafts; the second static contact and the third static contact of the two single-pole double-throw switches are respectively connected to the first static contact and the first moving contact of the two first single-phase switches in the first switch group; the composite moving contacts of the two single-pole double-throw switches are respectively connected to the fourth static contact or the fourth moving contact of the two fourth 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, it also includes a main case and a sub-case, the first switch group, the second switch group and the fourth switch group are located in the main case, the three first drive shafts, the two second drive shafts and the two fourth drive shafts are arranged in the main case and the sub-case, and a first power source for driving the first drive shaft, a second power source for driving the second drive shaft and a third power source for driving the fourth drive shaft are provided in the sub-case.

[0008] Preferably, the first drive shaft is connected to the first transmission arm, the first transmission arm is connected to the first push-pull rod, the first push-pull rod is connected to the first moving contact, the second drive shaft is connected to the second transmission arm, the second transmission arm is connected to the second push-pull rod, the second push-pull rod is connected to the second rocker rod, the second rocker rod is connected to the composite moving contact, the fourth drive shaft is connected to the fourth transmission arm, the fourth transmission arm is connected to the fourth push-pull rod, and the fourth push-pull rod is connected to the fourth moving contact.

[0009] Preferably, the first power source is a first spring energy storage mechanism and a first motor.

[0010] Preferably, the second power source is a second spring energy storage mechanism and a second motor.

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

[0012] Preferably, key holes and locking pins are provided on the three first drive shafts.

[0013] In the above technical solution, the first switch group is responsible for controlling the on and off of the three-phase line, which can maintain the conduction of a faulty phase and cut off the remaining faulty phases. The two single-pole double-throw switches of the second switch group cooperate with the fourth switch group to realize the grounding or common wire connection of two phases in the three-phase line 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 main box and the auxiliary box of the device cooperate with each other to realize the arrangement of the drive mechanism. While ensuring the realization of the above functions, the structure is as simple as possible and saves costs. It can well replace the current three-phase circuit breaker on the column, thereby playing the dual role of a circuit breaker and a mechanism for handling short-circuit faults, and has important practical and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the present invention;

[0015] Figure 2 yes Figure 1 Sectional view along CC direction (power source omitted);

[0016] Figure 3 yes Figure 1 Sectional view along BB direction (power source omitted);

[0017] Figure 4 yes Figure 1 Section view along AA direction;

[0018] Figure 5 It is a schematic diagram of the distribution structure of the first switch group, the second switch group and the fourth switch group of the on-off device;

[0019] Figure 6 Schematic diagram of radially arranged key holes and locking pins (unlocked);

[0020] Figure 7 Schematic diagram of radially arranged key holes and locking pins (locked);

[0021] Figure 8 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);

[0022] Fig. 9 is with Figure 8 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

[0023] 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.

[0024] As shown in the accompanying drawings, the switching device includes a main box body 100 and a sub-box body 101. A first switch group 1, a second switch group 2 and a fourth switch group 3 are arranged in the main box body 100. The first switch group 1, the second switch group 2 and the fourth switch group 3 are arranged in three layers of upper, middle and lower. The first switch group 1 includes three first single-phase switches that are in the same layer and arranged in parallel. The three first single-phase switches include three first arc extinguishing chambers 101, 102, and 103. The three first arc extinguishing chambers 101, 102, and 103 are arranged in parallel laterally. A first static contact 1011 and a first moving contact 1012 are arranged in the first arc extinguishing chamber 101, a first static contact 1021 and a first moving contact 1022 are arranged in the first arc extinguishing chamber 102, and a first static contact 1031 and a first moving contact 1032 are arranged in the first arc extinguishing chamber 103. The second switch group 2 includes two single-pole double-throw switches located in the same layer and arranged in parallel, namely, 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 on the second arc extinguishing chamber 2011, and a third static contact 2016 is provided on the third arc extinguishing chamber 2012. 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 reciprocate 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 on the second arc extinguishing chamber 2021, a third static contact 2026 is provided on the third arc extinguishing chamber 2022, and a composite moving contact 2027 is provided between the second arc extinguishing chamber 2021 and the third arc extinguishing chamber 2022. The composite moving contact 2027 can reciprocate to selectively contact and conduct with the second static contact 2025 and the third static contact 2026. The fourth switch group 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.

[0025] The second static contact 2015 and the third static contact 2016 of the single-pole double-throw switch 201 are connected to the first static contact 1011 and the first moving contact 1012 via wires, respectively, the composite moving contact 2017 is connected to the fourth moving contact 3012, and the fourth static contact 3011 is used to connect to the earth or a common wire (or the composite moving contact 2017 is connected to the fourth static contact 3011, and the fourth moving contact 3012 is used to connect to the earth 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 to the first static contact 1031 and the first moving contact 1032 via wires, respectively, the composite moving contact 2027 is connected to the fourth moving contact 3022, and the fourth static contact 3021 is used to connect to the earth or a common wire (or the composite moving contact 2027 is connected to the fourth static contact 3021, and the fourth moving contact 3022 is used to connect 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 bus 3029 for grounding.

[0026] The three first moving contacts of the first switch group 1, the two composite moving contacts of the single-pole double-throw switch of the second switch group 2, and the two fourth moving contacts of the fourth switch group 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.

[0027] 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 drive shaft 13 transversely arranged on the main housing 100, a second drive shaft 14 coaxially arranged outside the first drive shaft 13, and a third drive shaft 15 coaxially arranged outside the second drive shaft 14. The first drive shaft 13, the second drive shaft 14, and the third drive shaft 15 pass through the main housing 100 and enter the auxiliary housing 101, and are then respectively connected to the first power source. One end of the first transmission arm 19 is fixedly mounted on the first drive shaft 13, and the other end is connected to one end of the first push-pull rod 16, and the other end of the first push-pull rod 16 is connected to the first moving contact 1012. One end of the first drive shaft 13 located in the auxiliary box is connected to the first power source (not shown in the figure), so that when the first power source drives the first drive shaft to rotate, the first transmission arm 19 will drive the first push-pull rod 16 to move upward, and then pull the first moving contact 1012 so that the first moving contact 1012 is separated from the first static contact 1011. Similarly, the first moving contact 1022 is also driven by another first power source, the first transmission arm and the first push-pull rod that are separately arranged, and the first moving contact 1032 is also driven by the third first power source, the first transmission arm 22, and the first push-pull rod 23 that are separately arranged. In this way, the first switch group 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.

[0028] Furthermore, in a specific embodiment, the first drive shaft 13, the second drive shaft 14 and the third drive shaft 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 ).

[0029] 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 fourth drive shaft 27 arranged horizontally on the main housing 100, and a fifth drive shaft 28 is coaxially arranged outside the fourth drive shaft 27. The fourth drive shaft 27 and the fifth drive shaft 28 pass through the main housing 100 and enter the auxiliary housing 101, and then are respectively connected to the second power source. One end of the second transmission arm 29 is fixedly mounted on the fourth drive shaft 27, and the other end is connected to one end of the second push-pull rod 30, and the other end of the second push-pull rod 30 is connected to one end of the second swing rod 41, and the other end of the second swing rod 41 is connected to the composite moving contact 2017, and the middle part of the second swing rod is mounted on the rotating shaft, and the rotating shaft is fixed in the main housing. The fourth drive shaft 27 is located at one end of the auxiliary housing and is connected to the second power source (not shown in the figure), so that when the second power source drives the fourth drive shaft 27 to rotate, the second transmission arm 29 will drive the second push-pull rod 30 to move, and then pull the composite moving contact 2017 to move, so that the composite moving contact 2017 is separated from the second static contact and contacts with the third static contact, or separated from the third static contact and contacts with the second static contact. The second transmission arm 31 is fixedly mounted on the fifth drive shaft 28, and the second transmission arm 31 is connected to one end of the second push-pull rod 32, and the other end of the second push-pull rod 32 is connected to one end of another second swing rod 43, and the other end of the second swing rod 43 is connected to the composite moving contact 2027, and the middle part of the second swing rod 43 is installed on another rotating shaft, which is also fixed in the main housing. One end of the fifth drive shaft 28 located in the auxiliary box 101 is connected to the second power source, so that the movement of the composite moving contact 2027 can be controlled by the fifth drive shaft 28, so as to selectively contact the second static contact or the third static contact. The second 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.

[0030] In one embodiment, the present invention uses a fourth transmission mechanism and a third power source to drive the fourth switch group. The fourth transmission mechanism includes a sixth drive shaft 33 arranged transversely on the main box 100, and a seventh drive shaft 34 is coaxially arranged outside the sixth drive shaft 33. The sixth drive shaft 33 and the seventh drive shaft 34 pass through the main box 100 and enter the auxiliary box 101, and then are respectively connected to the third power source. One end of the third transmission arm 35 is fixedly mounted on the sixth drive shaft 33, and the other end is connected to one end of the third push-pull rod 36, and the other end of the third push-pull rod 36 is connected to the fourth moving contact 3012. The sixth drive shaft 33 is located at one end of the auxiliary box and is connected to the third power source (not shown in the figure). In this way, when the third power source drives the sixth drive shaft 33 to rotate, the third transmission arm 35 will drive the third push-pull rod 36 to move, and then pull the fourth moving contact 3012 to move, so that the fourth moving contact 3012 is separated or contacted with the fourth static contact. The third transmission arm 37 is fixedly mounted on the seventh drive shaft 34, the third transmission arm 37 is connected to the third push-pull rod 38, the third push-pull rod 38 is connected to the fourth moving contact 3022, and one end of the seventh drive shaft 34 located in the auxiliary box 101 is connected to the third power source, so that the movement of the fourth moving contact 3022 can be controlled by the seventh drive shaft 34, so that it can be in contact with or disconnected from the fourth static contact 3021. 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.

[0031] 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).

[0032] 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 pole-mounted switching mechanism for handling interphase faults in a dual power supply system, comprising a first switch group, a second switch group and a fourth switch group arranged in layers, characterized in that: The first switch group includes three first single-phase switches arranged on the same layer, the second switch group includes two single-pole double-throw switches arranged on the same layer, and the fourth switch group includes two fourth single-phase switches arranged on the same layer. The three first single-phase switches all include a first static contact and a first moving contact, and the first static contact and the first moving contact are provided with a first arc extinguishing chamber; the three first moving contacts are driven by three first drive shafts arranged coaxially respectively; the two single-pole double-throw switches all include a second static contact and a third static contact, and a composite moving contact is provided between the second static contact and the third static contact, and the two composite moving contacts are driven by two second drive shafts arranged coaxially respectively, and the second static contact and the composite moving contact are provided with a second arc extinguishing chamber at one end, and the third static contact and the composite moving contact are provided with a third arc extinguishing chamber at the other end; the two fourth single-phase switches all include a fourth static contact and a fourth moving contact, and the two fourth moving contacts are driven by two fourth drive shafts arranged coaxially respectively, and the fourth static contact and the fourth moving contact are provided with a fourth arc extinguishing chamber; 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 switch group; 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; It also includes a main case and a sub-case, the first switch group, the second switch group and the fourth switch group are located in the main case, the three first drive shafts, the two second drive shafts and the two fourth drive shafts are arranged in the main case and the sub-case, and a first power source for driving the first drive shaft, a second power source for driving the second drive shaft and a third power source for driving the fourth drive shaft are arranged in the sub-case.

2. The pole-mounted on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The first drive shaft is connected to the first transmission arm, the first transmission arm is connected to the first push-pull rod, the first push-pull rod is connected to the first moving contact, the second drive shaft is connected to the second transmission arm, the second transmission arm is connected to the second push-pull rod, the second push-pull rod is connected to the second swing rod, the second swing rod is connected to the composite moving contact, the fourth drive shaft is connected to the fourth transmission arm, the fourth transmission arm is connected to the fourth push-pull rod, and the fourth push-pull rod is connected to the fourth moving contact.

3. The pole-mounted on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The first power source is a first spring energy storage mechanism and a first motor.

4. The pole-mounted on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The second power source is a second spring energy storage mechanism and a second motor.

5. The pole-mounted on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: The third power source is a third spring energy storage mechanism and a third motor.

6. The pole-mounted on-off mechanism for handling interphase faults in a dual power supply system according to claim 1, characterized in that: Key holes and locking pins are provided on the three first drive shafts.

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