阅读说明：本技术 一种用于处理相间故障的通断机构 (On-off mechanism for processing interphase fault ) 是由 薛占钰 邢进春 于 2021-05-08 设计创作，主要内容包括：本发明公开了一种用于处理相间故障的通断机构,包括两个单刀双掷型开关和一个第三开关,单刀双掷型开关包括第一灭弧室和第二灭弧室,在第一灭弧室内设有第一静触头,在第二灭弧室内设有第二静触头,在第一灭弧室和第二灭弧室之间设有第一复合动触头,第一复合动触头一端位于第一灭弧室内,第一复合动触头另一端位于第二灭弧室内,第一复合动触头与第一静触头导通时则与第二静触头断开,第一复合动触头与第二静触头导通时则与第一静触头断开；第三开关包括第三灭弧室,在第三灭弧室内设有第三静触头和第三动触头。该通断机构结构简洁,能够实现一故障相导通并使另一故障相接大地或公用导线,而且便于与现有屏柜配套使用,具有重要的实用价值。(The invention discloses an on-off mechanism for processing an interphase fault, which comprises two single-pole double-throw type switches and a third switch, wherein each single-pole double-throw type switch comprises a first arc extinguish chamber and a second arc extinguish chamber, a first fixed contact is arranged in the first arc extinguish chamber, a second fixed contact is arranged in the second arc extinguish chamber, a first composite moving contact is arranged between the first arc extinguish chamber and the second arc extinguish chamber, one end of the first composite moving contact is positioned in the first arc extinguish chamber, the other end of the first composite moving contact is positioned in the second arc extinguish chamber, the first composite moving contact is disconnected with the second fixed contact when being conducted with the first fixed contact, and the first composite moving contact is disconnected with the first fixed contact when being conducted with the second fixed contact; the third switch comprises a third arc extinguish chamber, and a third fixed contact and a third moving contact are arranged in the third arc extinguish chamber. The on-off mechanism is simple in structure, can realize that one fault is conducted and the other fault is connected with the ground or a public wire, is convenient to be matched with the existing screen cabinet for use, and has important practical value.)

1. An on-off mechanism for handling phase-to-phase faults, comprising two single pole double throw type switches and a third switch, characterized in that: the single-pole double-throw type switch comprises a first arc extinguish chamber and a second arc extinguish chamber, wherein a first fixed contact is arranged in the first arc extinguish chamber, a second fixed contact is arranged in the second arc extinguish chamber, a first composite moving contact is arranged between the first arc extinguish chamber and the second arc extinguish chamber, one end of the first composite moving contact is positioned in the first arc extinguish chamber, the other end of the first composite moving contact is positioned in the second arc extinguish chamber, the first composite moving contact is disconnected with the second fixed contact when being conducted with the first fixed contact, and the first composite moving contact is disconnected with the first fixed contact when being conducted with the second fixed contact; the third switch comprises a third arc extinguish chamber, and a third fixed contact and a third moving contact are arranged in the third arc extinguish chamber.

2. The on-off mechanism for handling an inter-phase fault according to claim 1, wherein the single-pole double-throw type switch is located in a first insulating sleeve, the first insulating sleeve is respectively communicated with a first supporting tube, a second supporting tube and a third supporting tube, a first conductive joint is arranged at one end of the first supporting tube and electrically connected with the first fixed contact, a second conductive joint is arranged at one end of the second supporting tube and electrically connected with the first compound moving contact, a third conductive joint is arranged at one end of the third supporting tube and electrically connected with the second fixed contact, a first driving rod is further arranged on the first insulating sleeve and connected with the first compound moving contact and can drive the first compound moving contact to move; the third switch is positioned in the second insulating sleeve, the second insulating sleeve is respectively communicated with the fourth branch cylinder and the fifth branch cylinder, one end of the fourth branch cylinder is provided with a fourth conductive joint, the fourth conductive joint is electrically connected with the third fixed contact, one end of the fifth branch cylinder is provided with a fifth conductive joint, the fifth conductive joint is electrically connected with the third moving contact, the second insulating sleeve is further provided with a second driving rod in a penetrating mode, and the second driving rod is connected with the third moving contact and can drive the third moving contact to move.

3. The switching mechanism for handling a phase-to-phase fault as claimed in claim 2, wherein a first bracket is disposed in said first insulating sleeve, and the first bracket is fixedly connected to said first composite movable contact and said first driving rod, respectively.

4. The on-off mechanism for handling a phase-to-phase fault of claim 1, wherein the first compound movable contact is compounded by a first movable contact and a second movable contact via a flange connection.

5. The on-off mechanism for handling a phase-to-phase fault according to claim 2, wherein said first drive lever is connected to a first swing arm, said first swing arm being connected to and driven by said first energy storing mechanism, said second drive lever being connected to a second swing arm, said second swing arm being connected to and driven by said second energy storing mechanism.

6. The on-off mechanism for handling the phase-to-phase fault according to claim 5, wherein the first energy storage mechanism, the second energy storage mechanism, the two single-pole double-throw type switches, and the third switch are mounted on a slide table.

Technical Field

The invention relates to a device for switching on and off a circuit, in particular to a switching-on and switching-off mechanism for processing interphase short circuit faults.

Background

At present, the problems of complex operation, untimely operation, inaccurate positioning and the like exist in the processing of interphase short circuit faults of a power supply system, and the power supply quality is influenced. The invention patent application 202011453631.0, the invention patent application 202011453632.5, the invention patent application 202110420475.6 and the invention patent 202110420952.9 provide a method for processing an interphase short circuit of a power supply system, according to which, when the interphase short circuit occurs, a fault phase is maintained to be conducted and the other fault phase is tripped, then the other fault phase is connected with the earth or a public conductor, then a charged phase is connected with the earth or the public conductor to form a closed loop with the two fault phases connected through the short circuit and generate current or current pulse, and then the current duration or the current pulse number is detected through a controlled switch and tripped to cut off the fault. At present, the operation of cutting off and conducting the circuit is generally completed in the screen cabinet, therefore, the on-off device suitable for the operation of the screen cabinet is provided to maintain the conduction of one fault phase and connect the other fault phase with the ground or a public conductor, and the on-off device has important significance for promoting the landing and popularization of the method.

Disclosure of Invention

The invention aims to provide an on-off mechanism for processing interphase short circuit faults, which has a simple structure, can realize the conduction of one fault phase and connect the other fault phase with the ground or a public wire, is convenient to be matched with the conventional screen cabinet for use, and has important practical value.

In order to achieve the purpose, the invention adopts the following technical scheme:

an on-off mechanism for processing an interphase fault comprises two single-pole double-throw type switches and a third switch, wherein each single-pole double-throw type switch comprises a first arc extinguish chamber and a second arc extinguish chamber, a first fixed contact is arranged in each first arc extinguish chamber, a second fixed contact is arranged in each second arc extinguish chamber, a first composite moving contact is arranged between each first arc extinguish chamber and each second arc extinguish chamber, one end of each first composite moving contact is located in each first arc extinguish chamber, the other end of each first composite moving contact is located in each second arc extinguish chamber, each first composite moving contact is disconnected from the corresponding second fixed contact when being connected with the corresponding first fixed contact, and each first composite moving contact is disconnected from the corresponding first fixed contact when being connected with the corresponding second fixed contact; the third switch comprises a third arc extinguish chamber, and a third fixed contact and a third moving contact are arranged in the third arc extinguish chamber.

Preferably, the single-pole double-throw type switch is located in a first insulating sleeve, the first insulating sleeve is respectively communicated with a first support cylinder, a second support cylinder and a third support cylinder, one end of the first support cylinder is provided with a first conductive joint, the first conductive joint is electrically connected with the first fixed contact, one end of the second support cylinder is provided with a second conductive joint, the second conductive joint is electrically connected with the first composite moving contact, one end of the third support cylinder is provided with a third conductive joint, the third conductive joint is electrically connected with the second fixed contact, a first driving rod penetrates through the first insulating sleeve, and the first driving rod is connected with the first composite moving contact and can drive the first composite moving contact to move; the third switch is positioned in the second insulating sleeve, the second insulating sleeve is respectively communicated with the fourth branch cylinder and the fifth branch cylinder, one end of the fourth branch cylinder is provided with a fourth conductive joint, the fourth conductive joint is electrically connected with the third fixed contact, one end of the fifth branch cylinder is provided with a fifth conductive joint, the fifth conductive joint is electrically connected with the third moving contact, the second insulating sleeve is further provided with a second driving rod in a penetrating mode, and the second driving rod is connected with the third moving contact and can drive the third moving contact to move.

Preferably, a first support is arranged in the first insulating sleeve, and the first support is fixedly connected with the first composite moving contact and the first driving rod respectively.

Preferably, the first compound moving contact is formed by combining a first moving contact and a second moving contact through flange connection.

Preferably, the first drive rod is connected to a first swing arm, the first swing arm is connected to and driven by the first energy storage mechanism, the second drive rod is connected to a second swing arm, and the second swing arm is connected to and driven by the second energy storage mechanism.

Preferably, the first energy storage mechanism, the second energy storage mechanism, the two single-pole double-throw type switches and the third switch are mounted on the sliding table.

In the technical scheme, the first composite moving contact of the single-pole double-throw type switch is conducted with the second fixed contact when being disconnected with the first fixed contact, so that the other fault phase is disconnected and simultaneously connected with the ground or a public wire, and the conduction of one fault phase is maintained only by the fact that the switch of the fault phase does not act. If the three phases are short-circuited, the third phase can be tripped (i.e. the third switch in the present invention can be tripped), so that the method of patent application 202011453631.0 and patent application 202011453632.5 is to maintain the conduction of one failed phase and to ground the other failed phase (or to the common conductor). The third switch in the on-off device can be a single-pole single-throw type switch, and the on-off device is designed to complete the functions more optimally, so that the structure is simple, and the manufacturing cost is well controlled; the third switch may also be a single-pole double-throw switch, but an arc-extinguishing chamber is added accordingly, which increases the cost, but the control logic is relatively simpler. The on-off device is matched with the sliding table for use, can be well matched with the cart type switch operation of the existing screen cabinet, and has important practical and popularization values.

Drawings

FIG. 1 is a schematic diagram of the principles of the present invention;

FIG. 2 is a front view of the present invention in a schematic configuration;

figure 3 is a schematic side view of the structure of the present invention.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings and examples, which are provided for illustration of the present invention and are not intended to limit the scope of the present invention.

The handcart type indoor alternating current vacuum circuit breaker is improved on the basis of three vacuum arc-extinguishing chambers of the existing S1-12 handcart type indoor alternating current vacuum circuit breaker, and two vacuum arc-extinguishing chambers are added to realize the function of a five-pole switch. Specifically, as shown in fig. 1, 2 and 3, the present turning-on and turning-off device includes two single-pole double-throw type switches 100 and one third switch 99. The single-pole double-throw type switch 100 comprises a first arc-extinguishing chamber 12 and a second arc-extinguishing chamber 9, secured inside the first arc-extinguishing chamber 12A first fixed contact 122 is fixed, and a part of the first fixed contact 122 is located outside the first arc extinguish chamber and is used for being connected with the phase line. A second stationary contact 902 is fixed in the second arc extinguish chamber 9, and a part of the second stationary contact is located outside the second arc extinguish chamber and is used for being connected with the ground or a common wire. A first compound moving contact 123 is arranged between the first arc extinguish chamber 12 and the second arc extinguish chamber 9, one end of the first compound moving contact 123 is positioned in the first arc extinguish chamber 12, the other end of the first compound moving contact 123 is positioned in the second arc extinguish chamber 9, when the first compound moving contact 123 moves upwards, the first compound moving contact 123 can be in contact with the first fixed contact 122 and be switched on, and be separated from the second fixed contact 902 and be switched off, when the first compound moving contact 123 moves downwards, the first compound moving contact 123 can be in contact with the second fixed contact 902 and be switched off, and the first compound moving contact 123 is connected with the phase line. The above-mentioned conditions correspond to the respective switch K in FIG. 1 in phase A_AThe state in which phase line a1 is in conduction with phase line a2 (disconnected from earth or the common conductor), or switch K_ADA state in which phase line a2 is in conduction with the earth (or common conductor) (disconnected from phase line a 1). Alternatively, the above-mentioned cases correspond to the switches K in fig. 1 in the C phase, respectively_CThe state in which phase C1 is in conduction with phase C2 (disconnected from earth or the common conductor), or switch K_CDA state in which phase line C2 is in conduction with the ground (or common conductor) (disconnected from phase line C1). The third switch 99 includes a third arc extinguish chamber 991, and a third fixed contact and a third movable contact 992 are fixed in the third arc extinguish chamber. When the third switch 99 is closed, it corresponds to the switch K in FIG. 1_BConducting phase line B1 and phase line B2.

In a preferred embodiment, three insulating sleeves are provided, wherein two single-pole double-throw type switches 100 are respectively placed in two first insulating sleeves 1, the first insulating sleeves 1 are respectively in sealed communication with a first supporting tube 101, a second supporting tube 102 and a third supporting tube 103 along three directions, a first conductive joint 13 is arranged at one end of the first supporting tube 101, the first conductive joint 13 is electrically connected with a first fixed contact 122 through a conductive leading-out plate 121, a second conductive joint 14 is arranged at one end of the second supporting tube 102, and the second conductive joint 14 is in flexible connection with a first composite movable contact 123 through a flexible wire 11 so as to match up-and-down movement of the first composite movable contact and realize electric conduction. A third conductive contact 15 is disposed at one end of the third support 103, and the third conductive contact 15 is electrically connected to the second stationary contact 902 through a conductive end plate 901. The first conductive joint 13, the second conductive joint 14 and the third conductive joint 15 are used for being inserted into corresponding electric connection seats on a screen cabinet, so that the first fixed contact 122, the second fixed contact 902 and the first composite movable contact 123 are communicated with an external circuit, which is the same as the operation mode of the existing S1-12 handcart type indoor alternating current vacuum circuit breaker, therefore, the on-off device can adapt to the operation of the screen cabinet, accords with the operation regulations and safety standards of the screen cabinet, and greatly improves the operation safety. Similarly, the third switch 99 is disposed in the second insulating sleeve, the second insulating sleeve is correspondingly provided with a fourth supporting tube and a fifth supporting tube, the fourth supporting tube is provided with a fourth conductive connector for electrically connecting with the third stationary contact, and the fifth supporting tube is provided with a fifth conductive connector for electrically connecting with the third moving contact 992. Two first insulating sleeves 1, second insulating sleeve are installed on insulating sleeve supporting seat 3.

In one embodiment, a first driving rod is further disposed on the first insulating sleeve 1, and the first driving rod 7 is connected to the first compound movable contact 123 and can drive the first compound movable contact to move. In one embodiment, a first support 8 is provided, and one end of the first support 8 is fixedly connected to the first driving rod 7, and the other end of the first support 8 is fixedly connected to the first composite movable contact 123, so as to transmit the motion of the first driving rod to the first composite movable contact 123. The second driving rod 6 penetrates through the second insulating sleeve and is fixedly connected with the third moving contact 992, so that the third moving contact can be driven to move.

In one embodiment, the first composite moving contact 123 is formed by combining a first moving contact 904 and a second moving contact 903 connected through a flange 10. The first bracket 8 and the flexible conductor 11 are also fixed to the flange.

In one embodiment, the first drive rod 7 is connected to a first swing arm 16, the first swing arm 16 is connected to and driven by the first stored energy mechanism 2, and the second drive rod 6 is connected to a second swing arm, the second swing arm is connected to and driven by the second stored energy mechanism. The first energy storage mechanism 2, the second energy storage mechanism, the two single-pole double-throw type switches 100 and the third switch 99 are installed on the sliding table 4, and the screen cabinet can be pushed in through the sliding table 4, so that the conductive connectors are connected with the conductive connecting seats, and the conductive connectors are disconnected with the conductive connecting seats when the sliding table 4 is pulled out.

In use, when the sliding table 4 is pushed into the screen cabinet, each conductive connector is combined with the corresponding conductive connecting seat, the first composite moving contact 123 is conducted with the first fixed contact 122, and the third moving contact 992 is conducted with the third fixed contact. By the time a phase-to-phase fault needs to be handled in accordance with the methods of patent application 202011453631.0 and 202011453632.5, then, according to the information fed back by the protection device of the power system and the preset logic of the on-off device, the operation is started, for example, the phase AB is shorted between phases, the third switch 99 of the phase B is kept on, the first compound moving contact 123 of the single-pole double-throw type switch 100 moves downward, so as to be disconnected from the first fixed contact and be connected with the second fixed contact (thus, an a-phase outgoing line connected with the first compound moving contact 123 is disconnected with an a-phase outgoing line connected with a bus, the a-phase outgoing line connected with the first compound moving contact 123 is connected with the ground or a public conductor, and a live phase or a system neutral point of the bus is connected with the ground or the public conductor by matching with other devices, so that current pulse or continuous current can be generated, and a fault point can be cut off by using the controlled switch). If the ABC three-phase interphase short circuit occurs, the third switch of the B phase can be tripped, the single-pole double-throw type switch 100 of the C phase is maintained to be continuously conducted, and the single-pole double-throw type switch 100 of the A phase is switched to be grounded or connected to a common conductor.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.