A trolley mechanism for handling interphase short circuit in dual power supply system

Abstract

The present invention discloses a trolley mechanism for processing interphase short circuit of a dual power supply system, including a trolley seat, on which a first switch group, a second switch group and a third switch group are arranged in layers, wherein the first switch group includes three first single-phase switches arranged in the same layer, and the three first single-phase switches include a first static contact and a first moving contact arranged horizontally; the second switch group includes two second single-phase switches arranged in the same layer, and the two second single-phase switches include a second static contact and a second moving contact arranged vertically; the third switch group includes two third single-phase switches arranged in the same layer, and the two third single-phase switches include a third static contact and a third moving contact arranged horizontally. The trolley mechanism can realize the conduction of a fault phase and make the other fault phase connected to the earth or a common wire at either end of the cut-off point, and the device has a simple structure, is suitable for use with a screen cabinet, and has promotion value.

Description

Technical Field

[0001] The invention relates to a device for switching a circuit on and off, in particular to a trolley mechanism for handling interphase faults in a dual power supply system and used in a panel cabinet. 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 phase-to-phase short circuits 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 phase-to-phase 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 realize the operation of grounding or connecting the other faulty phase to a 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 trolley mechanism for handling interphase short circuit in a dual power supply system. The trolley mechanism can realize conduction of a 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, is suitable for use with a panel cabinet, and has promotion value.

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

[0005] A trolley mechanism for handling interphase short circuits in a dual power supply system comprises a trolley seat, a first switch group, a second switch group and a third switch group arranged in layers on the trolley seat, wherein the first switch group comprises three first single-phase switches arranged in the same layer, and the three first single-phase switches comprise a first static contact and a first moving contact arranged horizontally; the second switch group comprises two second single-phase switches arranged in the same layer, and the two second single-phase switches comprise a second static contact and a second moving contact arranged vertically; the third switch group comprises two third single-phase switches arranged in the same layer, and the two third single-phase switches comprise a third static contact and a third moving contact arranged horizontally; one end of the two second single-phase switches and the two third single-phase switches are connected to a grounding terminal, and the other ends of the two second single-phase switches and the two third single-phase switches are used to be connected to the moving contact ends of any two first single-phase switches and the static contact ends of any two first single-phase switches.

[0006] Preferably, a first arc extinguishing chamber is provided outside the three first static contacts and the first moving contact, a second arc extinguishing chamber is provided outside the two second static contacts and the second moving contact, and a third arc extinguishing chamber is provided outside the two third static contacts and the third moving contact.

[0007] Preferably, three insulating sleeves are provided on the vehicle seat, one of the insulating sleeves is provided with the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber, another insulating sleeve is provided with the first arc extinguishing chamber and the second arc extinguishing chamber, and the third insulating sleeve is provided with the first arc extinguishing chamber and the third arc extinguishing chamber.

[0008] Or preferably, three insulating sleeves are provided on the vehicle seat, one of the insulating sleeves is provided with the first arc extinguishing chamber, another insulating sleeve is provided with the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber, and the third insulating sleeve is provided with the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber.

[0009] Preferably, the moving contact ends of the two second single-phase switches and the two third single-phase switches are connected to the grounding terminal, and the static contact ends of the two second single-phase switches are connected to the moving contact ends of the two first single-phase switches. Three wiring plugs are provided on each of the insulating sleeves, namely, upper, middle and lower. The upper wiring plug is connected to the first static contact, the middle wiring plug is connected to the first moving contact, and the three lower wiring plugs are respectively connected to the two third static contacts and the grounding terminal.

[0010] Preferably, a bracket is provided on the vehicle seat, and a first support shaft, a second support shaft and a third support shaft are coaxially provided on the bracket, a first support shaft is provided with a first transmission arm, the first transmission arm is connected to the first push-pull rod, and the first push-pull rod is connected to one of the first moving contacts, a second support shaft is provided with a second transmission arm, the second transmission arm is connected to the second push-pull rod, and the second push-pull rod is connected to another of the first moving contacts, a third support shaft is provided with a third transmission arm, the third transmission arm is connected to the third push-pull rod, and the third push-pull rod is connected to the third of the first moving contacts, the first transmission arm is connected to the first power source, the second transmission arm is connected to the second power source, and the third transmission arm is connected to the third power source.

[0011] Preferably, a fourth support shaft is provided on the bracket, and a fourth transmission arm and a fifth transmission arm are provided on the fourth support shaft, the fourth transmission arm is connected to the fourth swing rod, and the fourth swing rod is connected to one of the second moving contacts; the fifth transmission arm is connected to the fifth swing rod, and the fifth swing rod is connected to another of the second moving contacts, the fourth transmission arm is connected to the fourth power source, and the fifth transmission arm is connected to the fifth power source.

[0012] Preferably, a fifth support shaft is provided on the bracket, and a sixth transmission arm and a seventh transmission arm are provided on the fifth support shaft, the sixth transmission arm is connected to the sixth push-pull rod, and the sixth push-pull rod is connected to one of the third moving contacts; the seventh transmission arm is connected to the seventh push-pull rod, and the seventh push-pull rod is connected to another of the third moving contacts, the sixth transmission arm is connected to the sixth power source, and the seventh transmission arm is connected to the seventh power source.

[0013] Preferably, key holes and locking mechanisms are provided on the first support shaft, the second support shaft and the third support shaft; the first power source, the second power source, the third power source, the fourth power source, the fifth power source, the sixth power source and the seventh power source are all spring energy storage mechanisms and motors or electromagnetic energy storage mechanisms and motors.

[0014] 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 one fault phase and cut off the other fault phases. The two single-phase switches of the second switch group and the two single-phase switches of the third switch group are respectively connected between the two sides of the first switch group and the ground, so that a single-phase switch in the first switch group can be grounded at the upper or lower end of the switch, which creates conditions for manufacturing a detection circuit including a short-circuit fault point and two fault phase conductors. The layered arrangement and horizontal and vertical settings of the arc extinguishing chamber in the handcart mechanism are reasonable, and the structure is as simple as possible and cost-saving while ensuring the realization of the above functions, which has important practical and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the left view of the trolley mechanism;

[0016] Figure 2 yes Figure 1 Sectional view along AA direction (power source omitted);

[0017] Figure 3 yes Figure 1 Sectional view along CC direction (power source omitted);

[0018] Figure 4 yes Figure 1 Sectional view along BB direction (power source omitted);

[0019] Figure 5 It is the right side view of the trolley mechanism (power source omitted);

[0020] Figure 6 It is a schematic diagram of the trolley mechanism with two wiring plugs reduced at the lower level;

[0021] Figure 7 yes Figure 1 Wiring diagram of the trolley mechanism in a three-phase circuit (A L , B L , C L Indicates the left side of the ABC three-phase of the first switch group, A R , B R , C R represents the right side of the ABC three-phase of the first switch group);

[0022] Figure 8 is with Figure 7 Schematic diagram of the structural connection relationship of the arc extinguishing chamber part of the trolley mechanism corresponding to the wiring principle;

[0023] Fig. 9 yes Figure 1 Schematic diagram of the three-dimensional structure distribution of the arc extinguishing chamber of the middle hand car mechanism;

[0024] Fig.10 This is another wiring diagram of the car mechanism in a three-phase circuit (A L , B L , C L Indicates the left side of the ABC three-phase of the first switch group, A R , B R , C R represents the right side of the ABC three-phase of the first switch group);

[0025] Fig.11 is with Fig.10 Schematic diagram of the structural connection relationship of the arc extinguishing chamber part of the trolley mechanism corresponding to the wiring principle;

[0026] Fig.12 yes Fig.11 Schematic diagram of the three-dimensional structural distribution of the arc extinguishing chamber of the trolley mechanism corresponding to the structural connection relationship. DETAILED DESCRIPTION

[0027] 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.

[0028] As shown in the accompanying drawings, the trolley mechanism includes a seat 1, a bracket 2 is provided on the seat 1, three vertically parallel insulating sleeves 301, 302, 303 are installed on the bracket 2, and a first arc extinguishing chamber 401 (corresponding to the first single-phase switch 40), a second arc extinguishing chamber 501 (corresponding to the second single-phase switch 50) and a grounding terminal 601 are provided from top to bottom in the insulating sleeve 301, wherein the first arc extinguishing chamber 401 is arranged horizontally, and a first static contact 4011 and a first moving contact 4012 are provided therein, the first static contact 4011 is electrically connected to a wiring plug 4013, and the first moving contact 4012 and a wiring plug 4014 connect the wire and the conductive rod. The second arc extinguishing chamber 501 is vertically arranged, and is provided with a second static contact 5011 and a second moving contact 5012. The second static contact 5011 is electrically connected to the first moving contact 4012. The second moving contact 5012 is connected to the grounding terminal 601 via a wire, and the grounding terminal 601 is connected to the wiring plug 4015 via a conductive rod. The wiring plug 4013, the wiring plug 4014 and the wiring plug 4015 are arranged on one side of the insulating sleeve 301 in the upper, middle and lower parts, and are used to be connected to the wiring socket on the panel cabinet.

[0029] The insulating sleeve 302 is provided with a first arc extinguishing chamber 402 (corresponding to the first single-phase switch 41), a second arc extinguishing chamber 502 (corresponding to the second single-phase switch 51) and a third arc extinguishing chamber 602 (corresponding to the third single-phase switch 60) from top to bottom, wherein the first arc extinguishing chamber 402 is arranged horizontally, and a first static contact 4021 and a first moving contact 4022 are arranged therein, the first static contact 4021 is electrically connected to the wiring plug 4023, and the first moving contact 4022 is connected to the wiring plug 4024 via a wire and a conductive rod. The second arc extinguishing chamber 502 is arranged vertically, and a second static contact 5021 and a second moving contact 5022 are arranged therein, the second static contact 5021 is connected to the first moving contact 4022 via a wire, and the second moving contact 5022 is connected to the grounding terminal 601 via a wire. The third arc extinguishing chamber 602 is arranged horizontally, and is provided with a third static contact 6021 and a third moving contact 6022. The third static contact 6021 is connected to the wiring plug 4025, and the third moving contact 6022 is connected to the ground terminal 601 via a wire. The wiring plug 4023, the wiring plug 4024 and the wiring plug 4025 are arranged on one side of the insulating sleeve 302 in the upper, middle and lower parts, and are used to be connected to the wiring socket on the panel cabinet.

[0030] A first arc extinguishing chamber 403 (corresponding to the first single-phase switch 42) and a third arc extinguishing chamber 603 (corresponding to the third single-phase switch 61) are arranged from top to bottom in the insulating sleeve 303, wherein the first arc extinguishing chamber 403 is arranged horizontally, and a first static contact 4031 and a first moving contact 4032 are arranged therein, the first static contact 4031 is electrically connected to the wiring plug 4033, and the first moving contact 4032 is connected to the wiring plug 4034 via a wire and a conductive rod. The third arc extinguishing chamber 603 is arranged horizontally, and a third static contact 6031 and a third moving contact 6032 are arranged therein, the third static contact 6031 is connected to the wiring plug 4035, and the third moving contact 6032 is connected to the grounding terminal 601 via a wire. The wiring plug 4033, the wiring plug 4034 and the wiring plug 4035 are arranged on one side of the insulating sleeve 303 in the upper, middle and lower parts, and are used to be connected to the wiring socket on the panel cabinet.

[0031] Three first support shafts 201, 202 and 203 are coaxially arranged on the bracket 2. A first transmission arm 2011 is fixedly arranged on the first support shaft 201. One end of the first transmission arm 2011 is connected to a first power source (not shown in the figure), and the other end is connected to a first push-pull rod 2012. The first push-pull rod 2012 is connected to a first moving contact 4012. A second support shaft 202 is arranged on the outer sleeve of the first support shaft 201. A second transmission arm 2021 is fixedly arranged on the second support shaft 202. One end of the second transmission arm 2021 is connected to a second power source, and the other end is connected to a second push-pull rod 2022. The second push-pull rod 2022 is connected to a first moving contact 4022. The third support shaft 203 is disposed on the outer sleeve of the second support shaft 202, and a third transmission arm 2031 is fixedly mounted on the third support shaft 203. One end of the third transmission arm 2031 is connected to the third power source, and the other end is connected to the third push-pull rod 2032. The third push-pull rod 2032 is connected to the first moving contact 4032. In this way, the first transmission arm 2011, the second transmission arm 2021 and the third transmission arm 2031 can respectively drive the first moving contacts 4012, 4022 and 4032 to move so as to separate from or contact the corresponding first static contacts. A common key hole 204 is provided on the first support shaft 201, the second support shaft 202 and the third support shaft 203, and a locking mechanism 207 is also provided at the key hole 204. The locking mechanism 207 is provided with a locking pin and can drive the locking pin to be inserted into the key hole 204 so that the first support shaft 201, the second support shaft 202 and the third support shaft 203 can rotate synchronously. At this time, the three first single-phase switches act synchronously. When power is supplied to the line, this synchronous action can make the three-phase line conduct synchronously.

[0032] The wiring plugs on the three insulating sleeves 301, 302 and 303 are distributed in three layers: upper, middle and lower. The wiring plugs 4013, 4023 and 4033 are located in the upper layer, the wiring plugs 4014, 4024 and 4034 are located in the middle layer, and the wiring plugs 4015, 4025 and 4035 are located in the lower layer. The panel cabinet is also provided with wiring sockets combined with these wiring plugs. The wiring sockets corresponding to the wiring plugs 4013, 4023 and 4033 and the wiring plugs 4014, 4024 and 4034 are the incoming and outgoing sockets of the three-phase line. The wiring socket corresponding to the wiring plug 4015 is connected to the working ground line, and the wiring socket corresponding to the wiring plug 4025 is connected to the wiring socket corresponding to the wiring plug 4023 through a wire, which is equivalent to connecting the second static contact 5021 and the third static contact 6021 at both ends of the first single-phase switch 41, and the first moving contact 4012 of the first single-phase switch 40 is connected to the second static contact 5011, and the first static contact 4031 of the first single-phase switch 42 is connected to the third static contact 6031 through the two wiring sockets on the screen cabinet and the wire between the wiring sockets. In this way, one phase of the three-phase line can be grounded at the upper or lower port of the first switch group (including the above three first single-phase switches; two second single-phase switches form the second switch group, and two third single-phase switches form the third switch group), and the other two phases can be grounded from the upper port and the other from the lower port, so as to meet the wiring requirements for handling phase-to-phase short circuit faults in the dual power supply system.

[0033] In another embodiment, only the upper wiring plugs 4013, 4023, 4033 and the middle wiring plugs 4014, 4024, 4034 and the lower wiring plug 4015 for connecting to the ground may be provided, without providing the lower wiring plugs 4025 and 4035. This is because the two wiring plugs are used to connect the two third static contacts 6021 and 6031 to the first static contact 4021 and the first static contact 4031 respectively through wiring from the panel cabinet outside the trolley mechanism. Therefore, corresponding connections can also be made from the inside of the trolley mechanism using insulated cables, and thus there is no need to provide the wiring plugs 4025 and 4035.

[0034] A fourth support shaft 205 is provided on the bracket 2, and a fourth transmission arm 2051 and a fifth transmission arm 2052 are fixedly mounted on the fourth support shaft 205, the fourth transmission arm 2051 is connected to a fourth swing rod 2055, the middle of the fourth swing rod 2055 is rotatably mounted on a rotating shaft 2053, and the other end is connected to the second moving contact 5012, the fifth transmission arm 2052 is connected to a fifth swing rod 2056, the middle of the fifth swing rod 2056 is rotatably mounted on a rotating shaft 2054, and the other end is connected to the second moving contact 5022. The fourth transmission arm 2051 and the fifth transmission arm 2052 are connected to a fourth power source and a fifth power source (not shown in the figure), respectively.

[0035] A fifth support shaft 206 is also provided on the bracket 2, and a sixth transmission arm 2061 and a seventh transmission arm 2062 are fixedly mounted on the fifth support shaft 206, and the sixth transmission arm 2061 and the seventh transmission arm 2062 drive the third moving contacts 6022 and 6032 respectively through a sixth push-pull rod 2063 and a seventh push-pull rod 2064. The sixth transmission arm 2061 and the seventh transmission arm 2062 are respectively connected to a sixth power source and a seventh power source (not shown in the figure).

[0036] The wiring schematic diagram and the arc extinguishing chamber structural connection diagram of the above embodiment are respectively as follows: Figure 7 and Figure 8 As shown, the two sides of the first single-phase switch 41 are respectively connected to the second single-phase switch 51 and the third single-phase switch 60 to achieve controllable grounding. The first single-phase switch 40 is controllable grounded through the second single-phase switch 50 at the lower end of the switch (moving contact end), and the first single-phase switch 42 is controllable grounded through the third single-phase switch 61 at the upper end of the switch (static contact end).

[0037] As another embodiment, the wiring principle diagram and the arc extinguishing chamber structure connection relationship diagram are shown in FIG. Fig.10 and Fig.11 As shown, the second single-phase switch 50 and the third single-phase switch 60 and the second single-phase switch 51 and the third single-phase switch 61 are respectively arranged on both sides of the two first single-phase switches 40 and 42 to realize the controllable grounding of the two first single-phase switches 40 and 42 on both sides. According to the wiring principle, a first single-phase switch 40, a second single-phase switch 50 and a third single-phase switch 60 of the trolley mechanism are placed in an insulating sleeve, another first single-phase switch 42, another second single-phase switch 51 and another third single-phase switch 61 are placed in another insulating sleeve, and the third first single-phase switch 41 and the grounding terminal 601 are placed in the third insulating sleeve. On this basis, corresponding wiring plugs and driving parts are arranged, which are the same or similar to the above-mentioned embodiments and will not be repeated.

[0038] The first power source, the second power source, the third power source, the fourth power source, the fifth power source, the sixth power source and the seventh power source are all spring energy storage mechanisms and motors or electromagnetic energy storage mechanisms and motors.

[0039] The trolley mechanism is arranged in a dual-power three-phase power supply system. When an interphase short circuit occurs, the three first single-phase switches can be controlled to be on and off respectively, so that one faulty phase can be maintained on and the remaining faulty phases can be cut off. The two second single-phase switches and the two third single-phase switches can ground the cut-off faulty phase from either end of the cut-off point of the faulty phase by the first single-phase switch, so that it can be used to handle the interphase short circuit of the dual-power supply system (the specific handling method can refer to the invention patent application 2021112516181).

[0040] 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 trolley mechanism for handling interphase short circuit in a dual power supply system, comprising a trolley seat, on which a first switch group, a second switch group and a third switch group are arranged in layers, characterized in that: The first switch group includes three first single-phase switches arranged on the same layer, the three first single-phase switches include first static contacts and first moving contacts arranged horizontally, and first arc extinguishing chambers are respectively provided outside the three first static contacts and first moving contacts; the second switch group includes two second single-phase switches arranged on the same layer, the two second single-phase switches include second static contacts and second moving contacts arranged vertically, and second arc extinguishing chambers are respectively provided outside the two second static contacts and second moving contacts; the third switch group includes two third single-phase switches arranged on the same layer, the two third single-phase switches include third static contacts and third moving contacts arranged horizontally, and third arc extinguishing chambers are respectively provided outside the two third static contacts and the third moving contacts; one end of the two second single-phase switches and the two third single-phase switches is connected to the grounding terminal, and the two second single-phase switches are grounded. The other end of the two third single-phase switches is used to be connected to the moving contact ends of any two of the first single-phase switches and the static contact ends of any two of the first single-phase switches; a bracket is provided on the vehicle seat, and a first support shaft, a second support shaft and a third support shaft are coaxially provided on the bracket, a first support shaft is provided with a first transmission arm, the first transmission arm is connected to the first push-pull rod, and the first push-pull rod is connected to one of the first moving contacts, a second support shaft is provided with a second transmission arm, the second transmission arm is connected to the second push-pull rod, and the second push-pull rod is connected to another first moving contact, a third support shaft is provided with a third transmission arm, the third transmission arm is connected to the third push-pull rod, and the third push-pull rod is connected to the third of the first moving contacts, the first transmission arm is connected to the first power source, the second transmission arm is connected to the second power source, and the third transmission arm is connected to the third power source.

2. The trolley mechanism for handling interphase short circuit in a dual power supply system according to claim 1, characterized in that: Three insulating sleeves are provided on the vehicle seat, one of the insulating sleeves contains the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber, another insulating sleeve contains the first arc extinguishing chamber and the second arc extinguishing chamber, and the third insulating sleeve contains the first arc extinguishing chamber and the third arc extinguishing chamber.

3. The trolley mechanism for handling interphase short circuit in a dual power supply system as claimed in claim 2, characterized in that: The moving contact ends of the two second single-phase switches and the two third single-phase switches are connected to the ground terminal, and the two second single-phase switches The static contact end of the switch is connected to the moving contact ends of the two first single-phase switches, and each of the insulating sleeves is divided into: Three wiring plugs are arranged in the middle and the lower part, wherein the upper wiring plug is connected to the first static contact, the middle wiring plug is connected to the first moving contact, and the three lower wiring plugs are respectively connected to the two third static contacts and the grounding terminal.

4. The trolley mechanism for handling interphase short circuit in a dual power supply system according to claim 1, characterized in that: Three insulating sleeves are provided on the vehicle seat, one of the insulating sleeves is provided with the first arc extinguishing chamber, another insulating sleeve is provided with the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber, and the third insulating sleeve is provided with the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber.

5. The trolley mechanism for handling interphase short circuit in a dual power supply system as claimed in claim 4, characterized in that: The moving contact ends of the two second single-phase switches and the two third single-phase switches are connected to the grounding terminal, and the static contact ends of the two second single-phase switches are connected to the moving contact ends of the two first single-phase switches. Three wiring plugs are provided on each of the insulating sleeves, namely, upper, middle and lower. The upper wiring plug is connected to the first static contact, the middle wiring plug is connected to the first moving contact, and the three lower wiring plugs are respectively connected to the two third static contacts and the grounding terminal.

6. The trolley mechanism for handling interphase short circuit in a dual power supply system as claimed in claim 1, characterized in that: A fourth support shaft is provided on the bracket, and a fourth transmission arm and a fifth transmission arm are provided on the fourth support shaft. The fourth transmission arm is connected to the fourth swing rod, and the fourth swing rod is connected to one of the second moving contacts; the fifth transmission arm is connected to the fifth swing rod, and the fifth swing rod is connected to another of the second moving contacts. The fourth transmission arm is connected to the fourth power source, and the fifth transmission arm is connected to the fifth power source.

7. The trolley mechanism for handling interphase short circuit in a dual power supply system as claimed in claim 6, characterized in that: A fifth support shaft is provided on the bracket, and a sixth transmission arm and a seventh transmission arm are provided on the fifth support shaft. The sixth transmission arm is connected to the sixth push-pull rod, and the sixth push-pull rod is connected to one of the third moving contacts; the seventh transmission arm is connected to the seventh push-pull rod, and the seventh push-pull rod is connected to another of the third moving contacts, the sixth transmission arm is connected to the sixth power source, and the seventh transmission arm is connected to the seventh power source.

8. The trolley mechanism for handling interphase short circuit in a dual power supply system as claimed in claim 7, characterized in that: Key holes and locking mechanisms are provided on the first support shaft, the second support shaft and the third support shaft; the first power source, the second power source, the third power source, the fourth power source, the fifth power source, the sixth power source and the seventh power source are all spring energy storage mechanisms and motors or electromagnetic energy storage mechanisms and motors.

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