A pole mechanism for processing inter-phase short circuit of dual power supply system

Abstract

The application discloses a pole mechanism for processing interphase short circuit of a dual-power supply system, which comprises a switch box, a first switch group, a second switch group and a third switch group are arranged in the switch box, the first switch group comprises three first single-phase switches, the second switch group comprises two second single-phase switches, the third switch group comprises two third single-phase switches, one end of the two second single-phase switches and the two third single-phase switches is connected with a grounding terminal, and the other end of the two second single-phase switches and the two third single-phase switches is connected with two first static contact terminals and two first dynamic contact terminals of any two first single-phase switches respectively. The pole mechanism can realize that one fault phase is conducted and the other fault phase is connected with the ground or a public conductor at any end of the cut-off point, the device structure is simple, the pole mechanism is suitable for use on a pole and has popularization value.

Description

Technical Field

[0001] This invention relates to a device for switching a circuit on and off, and more specifically to a column-mounted mechanism for handling phase-to-phase faults in a dual-power supply system and used on a column. Background Technology

[0002] Currently, the handling of phase-to-phase short-circuit faults in power supply systems suffers from problems such as cumbersome operation, untimely response, and inaccurate location, affecting power supply quality. Invention patent applications 202011453631.0, 202011453632.5, 202110420475.6, and 202110420952.9 provide methods for handling phase-to-phase short circuits in power supply systems. According to this method, when a phase-to-phase short circuit occurs, one faulty phase is kept conducting while the other faulty phases are tripped. Then, another faulty phase is connected to ground or a common conductor, and a live phase is connected to ground or a common conductor, thus forming a closed loop with the two faulty phases connected by the short circuit and generating current or current pulses. Then, a controlled switch detects the current duration or the number of current pulses and trips the circuit breaker to clear the fault. Based on the aforementioned patent applications, invention patent application 202111251618.1 provides a method for handling phase-to-phase short circuits in a dual-power three-phase power system. This method involves creating detection circuits on both sides of the fault point to clear the phase-to-phase short circuit fault. Specifically, this requires achieving the operation of cutting off the line while maintaining the conduction of one faulty phase in a pole-mounted environment such as a utility pole. It also requires enabling the other faulty phase to be grounded or connected to a common conductor from both sides of the cutting point. This necessitates a switching device capable of performing these operations. Summary of the Invention

[0003] The purpose of this invention is to provide a pole-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system. This pole-mounted mechanism can enable one faulty phase to conduct and connect the other faulty phase to the ground or a common conductor at either end of the disconnection point. The device has a simple structure, is suitable for use on poles, and has promotional value.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A pole-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system includes a switch box. The switch box contains a first switch group, a second switch group, and a third switch group. The first switch group includes three first single-phase switches, each including a first stationary contact and a first moving contact. The second switch group includes two second single-phase switches, each including a second stationary contact and a second moving contact. The third switch group includes two third single-phase switches, each including a third stationary contact and a third moving contact. One end of each of the two second and three third single-phase switches is connected to a grounding terminal, and the other end of each switch is connected to the two first stationary contacts and the two first moving contacts of any two first single-phase switches.

[0006] Preferably, the three first stationary contacts and the first moving contact are arranged horizontally, the two second stationary contacts and the second moving contact are arranged vertically, and the two third stationary contacts and the third moving contact are arranged horizontally. The two second stationary contacts are electrically connected to the two first moving contacts respectively, and the two third stationary contacts are electrically connected to the two first stationary contacts respectively.

[0007] Preferably, a support beam is also provided inside the switch box, a second push-pull rod that drives the second moving contact to slide through the support beam, a third push-pull rod that drives the third moving contact to slide through the support beam, and the second moving contact and the third moving contact are electrically connected to the grounding terminal.

[0008] Preferably, a first arc-extinguishing chamber is provided outside each of the three first stationary contacts and the first moving contact, a second arc-extinguishing chamber is provided outside each of the two second stationary contacts and the second moving contact, and a third arc-extinguishing chamber is provided outside each of the two third stationary contacts and the third moving contact.

[0009] Preferably, the supporting beam, the second push-pull rod, and the third push-pull rod are all conductors, the supporting beam is electrically connected to the grounding terminal, and the second push-pull rod and the third push-pull rod are in conductive contact with the supporting beam.

[0010] Preferably, the two first stationary contacts and the two third stationary contacts are connected and fixed via a conductive support plate.

[0011] Preferably, three first drive shafts are coaxially arranged on the switch box, each of the three first drive shafts is fixed with a first drive arm, the three first drive arms are respectively connected to three first push-pull rods, the three first push-pull rods are respectively connected to three first moving contacts, and the three first drive shafts extend out of the switch box and are respectively connected to three first power sources.

[0012] Preferably, the switch box is provided with three conductive sleeves, the three first push-pull rods pass through the three conductive sleeves respectively and are conductively connected to the three conductive sleeves, the three first push-pull rods are conductively connected to the three first moving contacts respectively, and the two second stationary contacts are conductively connected to the two conductive sleeves respectively.

[0013] Preferably, two second drive shafts are coaxially arranged on the switch box, each with a second drive arm fixed on it. The two second drive arms are respectively connected to two second push-pull rods, and the two second drive shafts extend out of the switch box and are respectively connected to two second power sources. Two third drive shafts are coaxially arranged on the switch box, each with a third drive arm fixed on it. The two third drive arms are respectively connected to two third push-pull rods, and the two third drive shafts extend out of the switch box and are respectively connected to two third power sources.

[0014] Preferably, the three first drive shafts are provided with keyholes and locking mechanisms.

[0015] Preferably, the first power source, the second power source, and the third power source are all spring energy storage mechanisms and motors or electromagnetic energy storage mechanisms and motors.

[0016] In the above technical solution, the first switch group is responsible for controlling the on / off state of the three-phase line, which can maintain the conduction of one faulty phase and disconnect the other faulty 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. In this way, one of the single-phase switches in the first switch group can be grounded at the upper or lower end of the switch, which creates the conditions for creating a detection circuit that includes the short-circuit fault point and the two faulty phase conductors. The single-phase switches in this pole-mounted mechanism are arranged in layers and reasonably set horizontally and vertically. While ensuring the above functions are achieved, the structure is as simple as possible and the cost is saved, which has important practical and promotional value. Attached Figure Description

[0017] Figure 1 This is the front view of the column-mounted mechanism;

[0018] Figure 2 yes Figure 1 Cross-sectional view along the MM direction (power source omitted);

[0019] Figure 3 yes Figure 1 Cross-sectional view along the NN direction;

[0020] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure distribution of the arc-extinguishing chamber of the mechanism on the central column;

[0021] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure of the arc-extinguishing chamber of the mechanism on the central column from another angle;

[0022] Figure 6 yes Figure 1 Wiring diagram of column-mounted mechanism in three-phase circuit (A) L B L C L This indicates the left side of the ABC three-phase group of the first switch group, A. R B R C R (Indicates the right side of the three phases A, B, and C of the first switch group).

[0023] Figure 7 Is with Figure 6 A schematic diagram of the structural connection relationship of the arc-extinguishing chamber part of the column-mounted mechanism corresponding to the wiring principle;

[0024] Figure 8 This is a schematic diagram of the three-dimensional structure distribution of the arc-extinguishing chamber in another embodiment;

[0025] Figure 9 yes Figure 8 The wiring diagram shown is for a three-phase circuit. (A) L B L C L This indicates the left side of the ABC three-phase group of the first switch group, A. R B R C R (Indicates the right side of the three phases A, B, and C of the first switch group).

[0026] Figure 10 Is with Figure 9 A schematic diagram of the structural connection relationship of the arc-extinguishing chamber part of the column-mounted mechanism corresponding to the wiring principle. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] As shown in the attached diagram, the column-mounted mechanism includes a switch box 1, within which a first switch group 2, a second switch group 3, and a third switch group 4 are arranged in layers. The first switch group 2 includes three single-phase switches 201, 202, and 203 arranged on the same layer. The first single-phase switch 201 has a first arc-extinguishing chamber 210, which is horizontally arranged and contains a first stationary contact 2011 and a first moving contact 2012. The first single-phase switch 202 also has a first arc-extinguishing chamber 211, which is horizontally arranged and contains a first stationary contact 2021 and a first moving contact 2022. The first single-phase switch 203 has a first arc-extinguishing chamber 212, which is horizontally arranged and contains a first stationary contact 2031 and a first moving contact 2032. The first stationary contacts 2011, 2021, and 2031 are connected to the three incoming terminals 220 on the switch box 1, respectively. The first moving contacts 2012, 2022, and 2032 are connected to the three outgoing terminals 221 on the switch box 1. Thus, the three first single-phase switches 201, 202, and 203 can control the on / off state of any phase of the three-phase circuit. If these three first single-phase switches are locked by a locking mechanism, they can also synchronously control the on / off state of the three-phase circuit, making them suitable for use as three-phase circuit breakers. The second switch group 3 includes two second single-phase switches 301 and 302 arranged on the same floor. The second single-phase switch 301 has a second arc-extinguishing chamber 311, which is vertically arranged and contains a second stationary contact 3011 and a second moving contact 3012. The second switch 302 has a second arc-extinguishing chamber 312, which is vertically arranged and contains a second stationary contact 3021 and a second moving contact 3022. The third switch group 4 includes two third switches 401 and 402 arranged on the same floor. The third switch 401 has a third arc-extinguishing chamber 411, which is arranged laterally and contains a third stationary contact 4011 and a third moving contact 4012. The third switch 402 has a third arc-extinguishing chamber 412, which is arranged laterally and contains a third stationary contact 4021 and a third moving contact 4022.

[0029] A support beam 5 is provided inside the switch box 1. The support beam 5 is basically coplanar with the two second single-phase switches 301 and 302 in the vertical direction and basically coplanar with the two third single-phase switches 401 and 402 in the horizontal direction. Two guide holes 511 and 512 are provided vertically on the support beam 5. One end of the second push-pull rod 521 is connected to the second moving contact 3012 and passes vertically through the guide hole 511. The second push-pull rod 521 is also connected to the second transmission arm 522. One end of the second push-pull rod 523 is connected to the second moving contact 3022 and passes vertically through the guide hole 512. The second push-pull rod 523 is also connected to the second transmission arm 524. Two guide holes 513 and 514 are provided laterally on the support beam 5. One end of the third push-pull rod 525 is connected to the third moving contact 4012 and passes laterally through the guide hole 513. The third push-pull rod 525 is also connected to the third transmission arm 526. One end of the third push-pull rod 527 is connected to the third moving contact 4022 and passes laterally through the guide hole 514. The third push-pull rod 527 is also connected to the third transmission arm 528.

[0030] Three first drive shafts 611, 612, and 613 are coaxially arranged inside the switch box 1. A first drive arm 614 is mounted on the first drive shaft 611, and the first drive arm 614 is connected to a first push-pull rod 615. The first push-pull rod 615 is connected to a first moving contact 2012. A first drive shaft 612 is coaxially arranged outside the first drive shaft 611. A first drive arm 616 is mounted on the first drive shaft 612, and the first drive arm 616 is connected to a first push-pull rod 617. The first push-pull rod 617 is connected to a first moving contact 2022. A first drive shaft 613 is coaxially arranged outside the first drive shaft 612. A first drive arm 618 is mounted on the first drive shaft 613, and the first drive arm 618 is connected to a first push-pull rod 619. The first push-pull rod 619 is connected to a first moving contact 2032. Three first drive shafts 611, 612, and 613 extend from one side of the switch box 1 and enter the drive box 7, respectively, and are connected to three first power sources (not shown in the figure). The three first power sources can drive three first moving contacts 2012, 2022, and 2032 respectively through the three first drive shafts, thereby causing the three first moving contacts to contact or separate from the three first stationary contacts 2011, 2021, and 2031. In this way, the on / off state of any phase of the three-phase line can be controlled separately. In one embodiment, a keyhole 8 and a locking mechanism 9 are provided at the radially overlapping part of the three first drive shafts 611, 612, and 613. The locking mechanism 9 is provided with a locking pin. When the locking pin is inserted into the keyhole 8, the three first drive shafts are locked and moved synchronously. At this time, the three first single-phase switches 201, 202, and 203 can move synchronously, for example, to provide synchronous power supply (at this time, they can be used as three-phase circuit breakers).

[0031] Two second drive shafts 10 and 11 are also provided on the switch box 1. The second drive shaft 10 is coaxially sleeved on the outside of the second drive shaft 11. The aforementioned second drive arm 522 is fixedly installed on the second drive shaft 10, and the second drive arm 524 is fixedly installed on the second drive shaft 11. The second drive shafts 10 and 11 pass out of the switch box 1 and enter the drive box 7, and are respectively connected to two second power sources.

[0032] Two third drive shafts 12 and 13 are also provided on the switch box 1. The third drive shaft 12 is coaxially sleeved outside the third drive shaft 13. The aforementioned third drive arm 526 is fixedly installed on the third drive shaft 12, and the third drive arm 528 is fixedly installed on the third drive shaft 13. The third drive shafts 12 and 13 extend out of the switch box 1 and enter the drive box 7, and are respectively connected to two third power sources. To better utilize space, the attached figure shows the second and third drive shafts as coaxial.

[0033] In one embodiment, three outgoing terminals 221 are connected to three conductive sleeves 710, 711, and 712, respectively. The second stationary contact 3011 is fixedly connected to the conductive sleeve 710, and the second stationary contact 3021 is also fixedly connected to the conductive sleeve 711. The first push-pull rod 615 passes laterally through the conductive sleeve 710 and is electrically connected to it. The first push-pull rod 617 passes laterally through the conductive sleeve 711 and is electrically connected to it. The first push-pull rod 619 passes laterally through the conductive sleeve 712 and is electrically connected to it. This ensures that the first moving contact 2012 is electrically connected to the second stationary contact 3011 and one outgoing terminal, the first moving contact 2022, the second stationary contact 3021, and another outgoing terminal are electrically connected, and the first moving contact 2032 is electrically connected to the third outgoing terminal.

[0034] In order to connect the two second moving contacts 3012, 3022 and the two third moving contacts 4012, 4022 to the grounding terminal 30, the support beam 5 is made of conductor and is connected to the grounding terminal 30. The two second moving contacts 3012, 3022 and the two third moving contacts 4012, 4022 are all in conductive contact with the support beam 5.

[0035] In one embodiment, the first stationary contact 2021 is electrically connected and fixed to the third stationary contact 4011 via a conductive support plate 21, and the first stationary contact 2031 is electrically connected and fixed to the third stationary contact 4021 via a conductive support plate 22. This serves both to connect the circuit and to fix the two third single-phase switches 401 and 402. This allows for controllable grounding of the two ends of a first single-phase switch 202 via a second single-phase switch 302 and a third single-phase switch 401, respectively. Furthermore, the first single-phase switch 201 is controllably grounded via the second single-phase switch 301, and the first single-phase switch 203 is controllably grounded via the third single-phase switch 402, thus providing the necessary equipment for handling phase-to-phase short circuits (see invention patent application 2021112516181 for the principle). The wiring diagram corresponding to this structure and the structural wiring relationship diagram of the arc-extinguishing chamber are shown below. Figure 6 and Figure 7 As shown.

[0036] In another embodiment, the first stationary contact 2011 and the third stationary contact 4011 are connected via a conductive support plate 50, and the first moving contact 2012 is connected to the second stationary contact 3011; the first stationary contact 2031 and the third stationary contact 4021 are connected via a conductive support plate 60, and the first moving contact 2032 is connected to the second stationary contact 3021. This allows the first single-phase switch 201 to be controllably grounded from both sides via the second single-phase switch 301 and the third single-phase switch 401, and the first single-phase switch 203 to be controllably grounded from both sides via the second single-phase switch 302 and the third single-phase switch 402. This also achieves the purpose of selectively grounding two phases from both sides of the first switch group. A schematic diagram of the three-dimensional structural distribution, wiring diagram, and arc-extinguishing chamber connection relationship corresponding to this structure are shown below. Figure 8 , Figure 9 and Figure 10 As shown.

[0037] The first, second, and third power sources mentioned above are all spring energy storage mechanisms and motors or electromagnetic energy storage mechanisms and motors.

[0038] This column-mounted mechanism is installed in a dual-power three-phase power supply system. When a phase-to-phase short-circuit fault occurs, the three first single-phase switches can control the on / off state of the faulty phases respectively, thus maintaining the conduction of one faulty phase and cutting off the remaining faulty phases. The two second single-phase switches and the two third single-phase switches can ground the disconnected faulty phase from either end of the disconnection point of the first single-phase switch to the faulty phase, thereby enabling it to be used to handle phase-to-phase short circuits in a dual-power supply system (for specific handling methods, please refer to invention patent application 2021112516181).

[0039] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pole-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system, comprising a switch box, wherein a first switch group, a second switch group, and a third switch group are disposed within the switch box, characterized in that, The first switch group includes three first single-phase switches, each of which includes a first stationary contact and a first moving contact; the second switch group includes two second single-phase switches, each of which includes a second stationary contact and a second moving contact; the third switch group includes two third single-phase switches, each of which includes a third stationary contact and a third moving contact; one end of each of the two second single-phase switches and the two third single-phase switches is connected to a grounding terminal, and the other end of each of the two second single-phase switches and the two third single-phase switches is respectively connected to the two first stationary contact ends of any two first single-phase switches and the two first moving contact ends of any two first single-phase switches; Three first stationary contacts and one first moving contact are arranged horizontally, two second stationary contacts and two second moving contacts are arranged vertically, and two third stationary contacts and three moving contacts are arranged horizontally. The two second stationary contacts are electrically connected to the two first moving contacts respectively, and the two third stationary contacts are electrically connected to the two first stationary contacts respectively. The switch box is also provided with a support beam, the second push-pull rod that drives the second moving contact slides through the support beam, the third push-pull rod that drives the third moving contact slides through the support beam, and the second moving contact and the third moving contact are electrically connected to the grounding terminal. The switch box is coaxially provided with three first transmission shafts, each of which is fixed with a first transmission arm. The three first transmission arms are respectively connected to three first push-pull rods, and the three first push-pull rods are respectively connected to three first moving contacts. The three first transmission shafts pass through the switch box and are respectively connected to three first power sources. The switch box is provided with three conductive sliding sleeves. The three first push-pull rods pass through the three conductive sliding sleeves respectively and are conductively connected to the three conductive sliding sleeves. The three first push-pull rods are conductively connected to the three first moving contacts respectively. The two second stationary contacts are conductively connected to the two conductive sliding sleeves respectively. Two second drive shafts are coaxially arranged on the switch box. A second drive arm is fixed on each of the two second drive shafts. The two second drive arms are respectively connected to two second push-pull rods. The two second drive shafts pass through the switch box and are respectively connected to two second power sources. Two third drive shafts are coaxially arranged on the switch box. A third drive arm is fixed on each of the two third drive shafts. The two third drive arms are respectively connected to two third push-pull rods. The two third drive shafts pass through the switch box and are respectively connected to two third power sources.

2. The column-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system as described in claim 1, characterized in that, A first arc-extinguishing chamber is provided outside each of the three first stationary contacts and the first moving contact; a second arc-extinguishing chamber is provided outside each of the two second stationary contacts and the second moving contact; and a third arc-extinguishing chamber is provided outside each of the two third stationary contacts and the third moving contact.

3. The column-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system as described in claim 1, characterized in that, The supporting beam, the second push-pull rod, and the third push-pull rod are all conductors. The supporting beam is electrically connected to the grounding terminal, and the second push-pull rod and the third push-pull rod are in conductive contact with the supporting beam.

4. The column-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system as described in claim 1, characterized in that, The two first stationary contacts and the two third stationary contacts are connected and fixed via a conductive support plate.

5. The column-mounted mechanism for handling phase-to-phase short circuits in a dual-power supply system as described in claim 1, characterized in that, The three first drive shafts are provided with keyholes and locking mechanisms.

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