Isolating switch finger, isolating switch unit and isolating switch for phase sequence conversion

Abstract

Disconnector finger, disconnector unit and disconnector for phase sequence conversion, which relate to the technical field of disconnectors and are used to solve the problems of serious wear of the finger and inflexible layout of the disconnector existing in the use of the existing phase sequence conversion disconnector. The disconnector finger includes a spring piece, a flexible connector and a contact block. One end of the spring piece is fixedly connected to one end of the flexible connector. The contact block is fixed to the other end of the flexible connector, and the other end of the flexible connector is located between the contact block and the other end of the spring piece. The disconnector unit includes a finger, and the disconnector for phase sequence conversion includes a five-phase disconnector unit. In the finger of the present invention, a flexible connector is arranged between the contact block and the spring piece. Compared with the conventional finger structure in the form of a pure copper plate, it has stronger flexibility and is relatively less affected by temperature, and can improve the current-carrying capacity and mechanical life. The disconnector for phase sequence conversion of the present invention can realize the flexible combination and layout of the disconnector units.

Description

Technical Field

[0001] The present invention relates to the technical field of disconnectors, and in particular to a disconnector finger, a disconnector unit and a disconnector for phase sequence conversion. Background Art

[0002] The high-voltage disconnector is an important switching device in the electrical systems of power plants and substations, and is used to isolate electrical equipment from the energized part to ensure the safe maintenance of the isolated electrical equipment. Some generators used in pumped storage are different from conventional thermal power and hydropower generators. Their units consist of reversible pump-turbines and motor-generators, and can realize the switching between the power generation and pumping conditions. The disconnector for phase sequence conversion supporting it should not only meet the large rated current carrying capacity, but also have the function of realizing phase sequence conversion.

[0003] At present, the technology of the disconnector for phase sequence conversion in pumped storage power stations is mainly mastered by foreign countries. Domestic has been relying on overall imports, with high purchase and maintenance costs and bringing instability to energy security. The highest rated current of the disconnector for phase sequence conversion in operation in China is 12,500 A, and the operating life is 10,000 times. With the continuous increase in the capacity of generators used in pumped storage and the continuous increase in power demand, the rated current demand may reach 16,000 A, and the operating life may reach 20,000 times or even higher.

[0004] At present, the disconnectors used for phase sequence conversion in pumped storage power stations in China mainly have the following defects in use: (1) The layout form is not flexible; the disconnectors of joint venture manufacturers mostly adopt two forms. The first is the five-phase disconnector combination type, and the layout form is two on the top and three on the bottom. The three lower phases are of an integral structure, and the two upper phases are also of an integral structure. The second is the three-phase disconnector intensive type, and the three-phase disconnectors are all located on the same chassis, and two of the disconnectors are of double-station design. Since there are only the above two different structural forms of disconnectors, it is required to design the height of the bus tunnel and the bus layout by choosing one of the existing structural methods of the phase sequence conversion disconnector at the initial stage of the power station design. (2) Poor modularity; for the phase sequence conversion disconnectors of the above two structures, due to the high integrity between multiple phases, the single-phase modularity is low, resulting in poor interchangeability of parts during maintenance, and the disassembly and assembly process is cumbersome, indirectly leading to higher maintenance costs and longer maintenance cycles. (3) Low rated current-carrying capacity; the highest rated current of the disconnectors for phase sequence conversion in operation in China is 12,500 A. With the continuous increase of the generator capacity adopted by pumped storage and the continuous increase of the power consumption demand, the rated current and the operation life demand may reach 16,000 A or even higher. (4) Low mechanical life and poor operation stability; the highest operation life of the disconnectors for phase sequence conversion in operation in China is 10,000 times. With the continuous increase of the power consumption demand, the daily operation times will be more frequent, and the operation life demand may reach 20,000 times or even higher. For the existing in-use disconnectors for phase sequence conversion, the problems that occur more frequently are damage to transmission components and wear of contact fingers. Summary of the Invention

[0005] The purpose of the present invention is to provide a contact finger of a disconnector, a disconnector unit and a disconnector for phase sequence conversion, which are used to solve the problems of serious wear of contact fingers and inflexible layout of existing phase sequence conversion disconnectors during use.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the contact finger of the disconnector includes a spring piece, a soft connecting piece and a contact block. One end of the spring piece is fixedly connected to one end of the soft connecting piece, the contact block is fixed to the other end of the soft connecting piece, and the other end of the soft connecting piece is located between the contact block and the other end of the spring piece.

[0007] Further, the soft connecting piece is formed by stacking a plurality of copper sheets, and the corresponding ends of the copper sheets are fixed as a whole.

[0008] Further, the other end of the spring piece has a folded edge, and the folded edge contacts the other end of the soft connecting piece.

[0009] The present invention also provides a disconnector unit, which includes a chassis, a static-side conductive seat, a moving-side conductive seat, a moving contact, a main knife drive assembly, an earthing knife drive assembly, an earthing knife, an earthing knife operating mechanism, and a main knife operating mechanism. The static-side conductive seat and the moving-side conductive seat are both fixed on the chassis through support insulators. The main knife operating mechanism and the earthing knife operating mechanism are both arranged on the chassis. The main knife operating mechanism is connected to the moving contact through a drive assembly. The earthing knife operating mechanism is connected to the earthing knife through the earthing knife drive assembly. One end of the moving contact is slidably connected to the moving-side conductive seat along a straight line. The ends of the moving-side conductive seat and the static-side conductive seat both have finger contacts. When the main knife operating mechanism acts, it drives one end of the moving contact to slide along the moving-side conductive seat through the main knife drive assembly, so that the other end of the moving contact contacts the finger contacts on the static-side conductive seat to achieve closing.

[0010] Further, the moving contact, the static-side conductive seat, and the moving-side conductive seat are all of cylindrical structures, and the finger contacts are uniformly arranged circumferentially at the ends of the static-side conductive seat and the moving-side conductive seat.

[0011] Further, the moving contact is slidably connected to the moving-side conductive seat through a suspension assembly. The suspension assembly includes a fixed bracket, a guide rail, a slider, and an adapter plate. The fixed bracket is fixed inside the moving-side conductive seat. The guide rail is fixed on the fixed bracket. The slider is slidably connected to the guide rail. One end of the adapter plate is fixedly connected to the slider, and the other end of the adapter plate extends inside the moving contact and is fixedly connected to the moving contact.

[0012] Further, radiators are provided on the outer walls of the static-side conductive seat and the moving-side conductive seat.

[0013] Further, the main knife drive assembly includes a transmission shaft, a driving crank arm, a lower push rod, a lower crank arm, a transmission rod, a connecting plate, an upper push rod, and an upper crank arm. The transmission shaft and the transmission rod are both rotatably connected to the chassis. One end of the transmission shaft is fixedly connected to the output end of the main knife operating mechanism. The other end of the transmission shaft is fixedly connected to one end of the driving crank arm. The other end of the driving crank arm is hinged to one end of the lower push rod. The other end of the lower push rod is hinged to one end of the lower crank arm. The other end of the lower crank arm is fixedly connected to one end of the transmission rod. The other end of the transmission rod is fixedly connected to one end of the upper crank arm. The other end of the upper crank arm is hinged to one end of the upper push rod. The other end of the upper push rod is hinged to the connecting plate. The connecting plate is fixedly connected to the moving contact.

[0014] Further, a housing is provided at the top of the chassis, and the static-side conductive seat, the moving-side conductive seat, the main knife drive assembly, the earthing knife drive assembly, the earthing knife, and the moving contact are all located inside the housing.

[0015] The present invention also provides a disconnector for phase sequence conversion, which includes a five-phase disconnector unit.

[0016] The beneficial effects of the present invention are as follows: A soft connecting member is provided between the finger contact and the contact block and the spring piece of the present invention. Compared with the conventional finger contact structure in the form of a pure copper plate, it has stronger flexibility, is relatively less affected by temperature, can improve the current-carrying capacity and mechanical life; in the disconnecting switch unit of the present invention, the moving contact is slidably connected to the moving-side conductive base. Compared with the conventional bearing-guided connection method, the gap is smaller and the load-bearing capacity is stronger, which can effectively ensure good contact between the moving contact and the finger contact and improve the mechanical service life; the disconnecting switch for phase sequence conversion of the present invention includes five independent disconnecting switch units, which can realize flexible combination and arrangement of the disconnecting switch units and effectively solve the problem of limited on-site installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional view of the single-phase disconnecting switch unit of the present invention;

[0018] Figure 2 is Figure 1 a schematic diagram after removing the upper housing and the middle housing in

[0019] Figure 3 is Figure 2 a partial enlarged view of part A in

[0020] Figure 4 is a three-dimensional view of the finger contact;

[0021] Figure 5 is Figure 4 a partial enlarged view of part B in

[0022] Figure 6 is a three-dimensional view of the main knife drive assembly;

[0023] Figure 7 is a three-dimensional assembly drawing of the suspension assembly and the moving contact;

[0024] Figure 8 is a three-dimensional view of the radiator;

[0025] Figure 9 is a side view of the earthing knife;

[0026] In the figure: 1 chassis, 11 legs, 2 housing, 21 upper housing, 211 heat sink, 22 middle housing, 221 main knife observation window, 23 lower housing, 231 earthing knife observation window, 3 earthing knife operating mechanism, 3' main knife operating mechanism, 4 support insulator, 5 earthing knife, 51 earthing knife support, 52 knife arm, 53 swing arm, 54 static contact, 6 conductive seat support, 7 static side conductive seat, 7' moving side conductive seat, 8 finger, 81 spring piece, 811 folded edge, 82 flexible connector, 821 copper sheet, 83 contact block, 84 pressing plate, 9 moving contact, 10 suspension assembly, 101 fixed support, 102 guide rail, 103 slider, 104 adapter plate, 11 main knife drive assembly, 111 upper crank arm, 112 upper push rod, 113 connecting plate, 114 lower crank arm, 115 lower push rod, 116 active crank arm, 117 transmission shaft, 118 transmission rod, 12 radiator, 121 fin, 122 copper tube. Detailed implementation mode

[0027] The finger of the disconnector, the disconnector unit and the phase sequence conversion disconnector of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] As Figure 4 、 Figure 5 shown, the finger 8 of the disconnector includes a spring piece 81, a flexible connector 82 and a contact block 83. One end of the spring piece 81 is fixedly connected to one end of the flexible connector 82, and the contact block 83 is fixed to the other end of the flexible connector 82, and the other end of the flexible connector 82 is located between the contact block 83 and the other end of the spring piece 81. The flexible connector 82 and the contact block 83 are fastened and pressed by bolts. The setting of the flexible connector 82 enables elastic connection and flexible connection between the contact block 83 and the spring piece 81. Furthermore, the whole finger 8 is relatively less affected by temperature, which can improve the overall current-carrying capacity and mechanical service life. As Figure 5 shown, the flexible connector 82 is formed by stacking a plurality of copper sheets 821, and the corresponding ends of the copper sheets 821 are welded and fixed to form a whole. The other end of the spring piece 81 has a folded edge 811. The setting of the folded edge 811 makes the other end of the spring piece 81 in a "U" shape structure, and the folded edge 811 contacts the other end of the flexible connector 82. The setting of the folded edge 811 can increase the elasticity of the spring piece 81 and enhance the contact force between the contact block 83 and the moving contact 9. The spring piece 821 constituting the flexible connector 82 includes three sections. The two sections at the ends are arranged approximately parallel, and the section in the middle connects the two sections at the ends, and the section in the middle is inclined relative to the spring piece 81. For the convenience of assembling the whole finger 8, as Figure 4 shown, a pressing plate 84 is provided at one end of the spring piece 81, and the pressing plate 84 and the flexible connector 82 sandwich one end of the spring piece 81 in the middle. During installation, bolts are inserted through the pressing plate 84 and the flexible connector 82, and one end of the finger 8 is fixedly connected to the conductive seat of the disconnector through the bolts.

[0029] The finger structure of the present invention is more flexible than the conventional finger made of pure copper plate. While improving the mechanical service life, its current-carrying capacity is enhanced.

[0030] The present invention also provides a disconnector unit including the above-mentioned finger 8, as Figure 1 , Figure 2 shown. The disconnector unit further includes a chassis 1, a housing 2, a static-side conductive seat 7, a moving-side conductive seat 7', a moving contact 9, a main knife drive assembly 11, an earthing knife drive assembly, an earthing knife 5, an earthing knife operating mechanism 3, and a main knife operating mechanism 3'. The chassis 1 is a supporting component of the disconnector unit, and legs 11 are provided at the bottom of the chassis 1. As Figure 2 shown, both the static-side conductive seat 7 and the moving-side conductive seat 7' are fixed on the chassis 1 through vertically arranged support insulators 4. As Figure 1 shown, a housing 2 is provided at the top of the chassis 1. The housing 2 includes an upper housing 21, a middle housing 22, and a lower housing 23 arranged in sequence from top to bottom. The upper housing 21 and the middle housing 22, as well as the middle housing 22 and the lower housing 23, are fixedly connected by bolts or screws. The bottom of the support insulator 4 is fixedly connected to the lower housing 23, and the top of the support insulator 4 is fixedly connected to the corresponding static-side conductive seat 7 or moving-side conductive seat 7'. As Figure 2 shown, to enhance the stability of the static-side conductive seat 7 and the moving-side conductive seat 7', a conductive seat support 6 is further provided between the side walls of the static-side conductive seat 7 and the moving-side conductive seat 7' and the lower housing 23. The conductive seat support 6 intersects with the support insulator 4, thereby enhancing the stability of the static-side conductive seat 7 and the moving-side conductive seat 7' laterally.

[0031] As Figure 2 shown, the main knife operating mechanism 3' and the earthing knife operating mechanism 3 are both arranged on the chassis 1. The main knife operating mechanism 3' is connected to the moving contact 9 through the main knife drive assembly 11, and the earthing knife operating mechanism 3 is connected to the earthing knife 5 through the earthing knife drive assembly. One end of the moving contact 9 is slidably connected to the moving-side conductive seat 7' along a straight line. The ends of the moving-side conductive seat 7' and the static-side conductive seat 7 both have fingers 8. When the main knife operating mechanism 3' acts, it drives one end of the moving contact 9 to slide along the moving-side conductive seat 7' through the main knife drive assembly 11, so that the other end of the moving contact 9 contacts the finger 8 on the static-side conductive seat 7 to achieve closing.

[0032] As Figure 2 shown, the moving contact 9, the static-side conductive seat 7, and the moving-side conductive seat 7' are all cylindrical structures and are coaxially arranged. As Figure 3As shown, the contact fingers 8 are evenly arranged circumferentially at the ends of the static-side conductive base 7 and the moving-side conductive base 7', that is, the contact fingers 8 on the static-side conductive base 7 and the moving-side conductive base 7' enclose a ring. The pressure plates 81 of the contact fingers 8 are fixedly connected to the ends of the static-side conductive base 7 and the moving-side conductive base 7' by bolts. As Figure 7 shown, the moving contact 9 is slidably connected to the moving-side conductive base 7' through a suspension assembly 10. The suspension assembly includes a fixed bracket 101, a guide rail 102, a slider 103 and an adapter plate 104. The fixed bracket 101 is fixed to the inner side of the moving-side conductive base 7'. The guide rail 102 is fixed on the fixed bracket 101. The slider 103 is slidably connected to the guide rail 102. One end of the adapter plate 104 is fixedly connected to the slider 103, and the other end of the adapter plate 104 extends to the inner side of the moving contact 9 and is fixedly connected to the moving contact 9. When the moving contact 9 is pushed axially, under the linear sliding guiding action between the slider 103 and the guide rail 102, the moving contact 9 approaches or moves away from the static-side conductive base 7 axially. When the moving contact 9 approaches the static-side conductive base 7, the end of the moving contact 9 gradually extends into the contact blocks 83 of the contact fingers 8 arranged in a ring and presses the contact blocks 83. Under the elastic action of the spring plate 81, the contact blocks 83 remain in contact with and press the moving contact 9, thereby realizing the closing of the moving-side conductive base 7' and the static-side conductive base 7. When the moving contact 9 moves away from the static-side conductive base 7, the end of the moving contact 9 gradually disengages from the contact blocks 83 of the contact fingers 8 arranged in a ring, thereby realizing the opening of the moving-side conductive base 7' and the static-side conductive base 7.

[0033] As Figure 2 shown, in order to dissipate heat from the static-side conductive base 7 and the moving-side conductive base 7', radiators 12 are provided on the outer walls of both the static-side conductive base 7 and the moving-side conductive base 7'. As Figure 8 shown, the radiator 12 includes a plurality of fins 121 and a plurality of copper tubes 122. The plurality of fins 121 are arranged in parallel at equal intervals, and the copper tubes 122 are interspersed between the fins 121. The structure of the radiator 12 is a prior art and will not be described in detail. A plurality of radiators 12 are provided on both the static-side conductive base 7 and the moving-side conductive base 7', thereby ensuring the heat dissipation effect of the static-side conductive base 7 and the moving-side conductive base 7' through the setting of the radiators 12.

[0034] As Figure 6As shown in the figure, the main knife drive assembly 11 includes a drive shaft 117, a driving crank arm 116, a lower push rod 115, a lower crank arm 114, a transmission rod 118, a connecting plate 113, an upper push rod 112, and an upper crank arm 111. The drive shaft 117 and the transmission rod 118 are both vertically arranged and are both rotatably connected to the chassis 1. One end of the drive shaft 117 is fixedly connected to the output end of the main knife operating mechanism 3'. The other end of the drive shaft 117 is fixedly connected to one end of the driving crank arm 116. The other end of the driving crank arm 116 is hingedly connected to one end of the lower push rod 115. The other end of the lower push rod 115 is hingedly connected to one end of the lower crank arm 114. The other end of the lower crank arm 114 is fixedly connected to one end of the transmission rod 118. The other end of the transmission rod 118 is fixedly connected to one end of the upper crank arm 111. The other end of the upper crank arm 111 is hingedly connected to one end of the upper push rod 112. The other end of the upper push rod 112 is hingedly connected to the middle of the connecting plate 113. The connecting plate 113 is arranged along the radial direction of the moving contact 9 and is fixedly connected to one end of the moving contact 9 away from the static side conductive seat 7. The entire main knife drive assembly 11 forms a double crank arm structure. When the main knife operating mechanism 3' acts to drive the drive shaft 117 to rotate, it drives the driving crank arm 116 to rotate in the horizontal plane, and then pushes or pulls the lower crank arm 114 to rotate around the axis of the transmission rod 118 through the lower push rod 115, thereby driving the rotation of the transmission rod 118, and then driving the upper crank arm 114 to rotate around the transmission rod 118, and then pushing or pulling the connecting plate 113 through the upper push rod 112 to drive the movement of the moving contact 9, and the movement track of the moving contact 9 is a straight line where the axis of the moving contact 9 is located. When the moving contact 9 moves, one end of the moving contact 9 moves relative to the moving side conductive seat 7', and the other end of the moving contact 9 approaches or moves away from the static side conductive seat 7.

[0035] As Figure 2 , Figure 9 shown in the figure, the grounding knife 5 includes a grounding knife support 51, a knife arm 52, a swing arm 53, and a static contact 54. The grounding knife support 51 is fixed on the lower housing 23. The lower end of the knife arm 52 is hingedly connected to the grounding knife support 51. The upper end of the knife arm 52 has a static contact 54. The swing arm 53 is made of insulating material. One end of the swing arm 53 is hingedly connected to the knife arm 52. The other end of the swing arm 53 is connected to the grounding knife operating mechanism 3 through a grounding knife drive assembly. When the grounding knife operating mechanism 3 acts, it drives the swing of the swing arm 53 through the grounding knife drive assembly, and then pulls the knife arm 52 to swing around the grounding knife support 51, thereby realizing the opening and closing of the static contact 54 with the static side conductive seat 7 or the moving side conductive seat 7'. There are two grounding knives 5, grounding knife operating mechanisms 3, and grounding knife drive assemblies. The grounding knife operating mechanism 3 and the grounding knife drive assembly are both prior arts and will not be elaborated here.

[0036] To achieve the protection of the static-side conductive base 7, the moving-side conductive base 7', the main knife drive assembly 11, the earthing knife drive assembly, the earthing knife 5, and the moving contact 9, the static-side conductive base 7, the moving-side conductive base 7', the main knife drive assembly 11, the earthing knife drive assembly, the earthing knife 5, and the moving contact 9 are all located inside the housing. To facilitate observing the opening and closing states of the earthing knife 5 and the main knife, as Figure 1 shown, an earthing knife observation window 231 is provided on the lower housing 23. To facilitate observing the opening and closing state of the main knife, a main knife observation window 221 is provided on the middle housing 22. After the housing 2 encloses the static-side conductive base 7, the moving-side conductive base 7', the main knife drive assembly 11, the earthing knife drive assembly, the earthing knife 5, and the moving contact 9, although it plays a protective role, it reduces the heat dissipation effect of the static-side conductive base 7 and the moving-side conductive base 7'. Therefore, as Figure 1 shown, heat sinks 211 are provided on the side walls of the upper housing 21. Accessories such as lightning arresters and instrument transformers can also be installed on the upper housing 21. The finger contacts 8 and the moving contacts 9 of the present invention both adopt the graphene silver plating process, which increases the conductivity while improving the surface wear resistance, and further improves the current-carrying capacity and service life.

[0037] The present invention also provides a disconnector for phase sequence conversion, including a five-phase disconnector unit, and the five-phase disconnector unit can be flexibly combined and arranged according to needs at the use site. The disconnector for phase sequence conversion can be used in the environment of a pumped-storage power station to complete the switching between the two working conditions of power generation and pumping. The disconnector for phase sequence conversion of the present invention can also be applied to other use environments to achieve phase sequence conversion through opening and closing.

[0038] The finger contact of the present invention is provided with a soft connecting piece between the contact block and the spring piece. Compared with the finger contact structure in the form of a conventional pure copper plate, it has stronger flexibility, is relatively less affected by temperature, and can improve the current-carrying capacity and mechanical life; in the disconnector unit of the present invention, the moving contact is slidably connected to the moving-side conductive base through a linear sliding structure composed of a guide rail and a slider. Compared with the conventional bearing guiding connection method, the gap is smaller and the load-bearing capacity is stronger, which can effectively ensure the good contact between the moving contact and the finger contact and improve the mechanical service life; the disconnector for phase sequence conversion of the present invention includes five independent disconnector units, which can realize the flexible combination and arrangement of the disconnector units and effectively solve the problem of limited on-site installation space.

Claims

1. A phase sequence switching isolating switch, characterized in that: The invention comprises a five-phase isolating switch unit, which comprises a chassis, a static side conductive seat, a dynamic side conductive seat, a moving contact, a main knife transmission assembly, a ground knife transmission assembly, a ground knife, a ground knife operating mechanism and a main knife operating mechanism. The static side conductive seat and the dynamic side conductive seat are fixed on the chassis through supporting insulators, the main knife operating mechanism and the ground knife operating mechanism are both arranged on the chassis, the main knife operating mechanism is connected to the moving contact through a transmission assembly, the ground knife operating mechanism is connected to the ground knife through a ground knife transmission assembly, and one end of the moving contact is slidably connected to the dynamic side conductive seat along a straight line. The ends of the moving side conductive seat and the static side conductive seat are both provided with contact fingers. When the main knife operating mechanism is actuated, one end of the moving contact is driven by the main knife transmission assembly to slide along the moving side conductive seat, so that the other end of the moving contact contacts the contact finger on the static side conductive seat to realize closing; the outer walls of the static side conductive seat and the moving side conductive seat are both provided with heat sinks; the top of the base frame is provided with an outer shell, and the static side conductive seat, the moving side conductive seat, the main knife transmission assembly, the ground knife transmission assembly, the ground knife and the moving contact are all located on the inner side of the outer shell; the outer shell comprises an upper shell, a middle shell and a lower shell which are arranged in sequence from top to bottom, a ground knife observation window is provided on the lower shell, a main knife observation window is provided on the middle shell, and a heat sink is provided on the side wall of the upper shell.

2. The isolating switch for phase sequence conversion according to claim 1, characterized in that The contact finger includes a spring sheet, a soft connector and a contact block, one end of the spring sheet is fixedly connected to one end of the soft connector, the contact block is fixed to the other end of the soft connector, and the other end of the soft connector is located between the contact block and the other end of the spring sheet.

3. The isolating switch for phase sequence conversion according to claim 2, characterized in that: The flexible connector is formed by laminating a plurality of copper sheets, and the corresponding ends of the copper sheets are fixed to form a whole.

4. The isolating switch contact finger of the isolating switch for phase sequence conversion according to claim 3 is characterized in that: The other end of the spring sheet has a folded edge, and the folded edge contacts the other end of the flexible connector.

5. The isolating switch for phase sequence conversion according to claim 1, characterized in that: The moving contact, the stationary conductive seat and the moving conductive seat are all cylindrical structures, and the contact fingers are evenly arranged along the circumferential direction at the ends of the stationary conductive seat and the moving conductive seat.

6. The isolating switch for phase sequence conversion according to claim 5, characterized in that: The moving contact is slidably connected to the moving side conductive seat through a suspension assembly, and the suspension assembly includes a fixed bracket, a guide rail, a slider and an adapter plate. The fixed bracket is fixed to the inner side of the moving side conductive seat, the guide rail is fixed on the fixed bracket, the slider is slidably connected to the guide rail, one end of the adapter plate is fixedly connected to the slider, and the other end of the adapter plate extends to the inner side of the moving contact and is fixedly connected to the moving contact.

7. The isolating switch for phase sequence conversion according to claim 1, characterized in that: The main knife transmission assembly includes a transmission shaft, an active crank arm, a lower push rod, the lower crank arm, a transmission rod, a connecting plate, an upper push rod and an upper crank arm. The transmission shaft and the transmission rod are rotatably connected to the base frame, one end of the transmission shaft is fixedly connected to the output end of the main knife operating mechanism, the other end of the transmission shaft is fixedly connected to one end of the active crank arm, the other end of the active crank arm is hinged to one end of the lower push rod, the other end of the lower push rod is hinged to one end of the lower crank arm, the other end of the lower crank arm is fixedly connected to one end of the transmission rod, the other end of the transmission rod is fixedly connected to one end of the upper crank arm, the other end of the upper crank arm is hinged to one end of the upper push rod, the other end of the upper push rod is hinged to the connecting plate, and the connecting plate is fixedly connected to the moving contact.

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