Power distribution network ground fault phase active step-down arc extinction complete device

Abstract

The utility model relates to the technical field of emergency protection circuit devices, in particular to an active step-down arc extinction complete device for a ground fault phase of a power distribution network. The power distribution network ground fault phase active step-down arc extinction complete equipment comprises a shell, and a grounding transformer, a lightning arrester, a double-winding voltage transformer, a single-winding voltage transformer, a current transformer, a vacuum contactor, a high-voltage fuse and a damping resistor which are arranged in the shell and are electrically connected with one another, the shell is a box body comprising a left side sub-box and a right side sub-box which are detachably connected with each other, the grounding transformer is arranged in the left side sub-box, and the arc suppression coil measurement and control cabinet is arranged in the right side sub-box. The power distribution network ground fault phase active step-down arc extinction complete equipment solves the problem that the installation and transfer processes of the complete equipment are affected and limited due to the fact that the overall dimension of the complete equipment in the prior art is large.

Description

Technical Field

[0001] This utility model relates to the technical field of emergency protection circuit devices, and in particular to a complete set of devices for active voltage reduction and arc suppression in the grounding fault phase of a power distribution network. Background Technology

[0002] To address issues such as power outages, arcing fires, overvoltages, and electric shocks caused by single-phase grounding faults in distribution networks, a novel active voltage reduction and arc suppression device for grounding fault phases in distribution networks, titled "Active Voltage Reduction and Arc Suppression Device for Phases with Grounding Faults in Distribution Networks with Phase Power Supply Feeding to Neutral Point and Its Application," was described in the Chinese journal *High Voltage Engineering*, Volume 48, Issue 9, pages 3356-3366, published on September 30, 2022. This device primarily consists of a single-phase injection transformer and a grounding transformer (or injection transformer). The system consists of a grounding transformer group, an arc suppression coil, a switching cabinet, an arc suppression monitoring and control device, and related equipment such as a primary 10kV disconnector, fuses, surge arresters, and voltage transformers. The grounding transformer primarily provides neutral point and secondary line voltage to the distribution network. The single-phase injection transformer has an adjustable turns ratio for flexibly adjusting the voltage of the faulty phase. The switching cabinet mainly includes contactors for switching secondary line voltages. The arc suppression monitoring and control device mainly performs system parameter measurement, ground fault analysis, switching of the complete set of equipment, and control of the arc suppression coil's tap position. This structure enables the active voltage reduction arc suppression device for ground fault phases in the distribution network to eliminate the neutral point grounding system via the adjustable-turn arc suppression coil when a single-phase ground fault occurs. The active voltage reduction arc suppression device can be used in conjunction with the adjustable-turn arc suppression coil, connected to the same neutral point and operating in parallel with the arc suppression coil. The arc suppression coil compensates for the system capacitive current, while the active voltage reduction arc suppression device compensates for the residual current flowing through the fault point, thus achieving the effect of active voltage reduction arc suppression.

[0003] From "Active Voltage Reduction and Arc Extinguishing Device for Phase Faults in Distribution Networks with Phase Power Supply Feeded to Neutral Point and Its Application" Figure 3 It is known that a grounding transformer and an adjustable-turn arc suppression coil are installed in the low-voltage control room of the prefabricated substation power supply type complete set of equipment. Because the grounding transformer and the adjustable-turn arc suppression coil are large in size and volume, the structure and size of the low-voltage control room are also large. This makes it impossible for the prefabricated substation power supply type complete set of equipment to pass through small doors or narrow spaces during actual installation. As a result, the prefabricated substation power supply type complete set of equipment is easily affected and restricted by its external dimensions, which restricts the installation and transportation process of the equipment. Utility Model Content

[0004] The purpose of this utility model is to provide a complete set of active voltage reduction and arc suppression devices for ground fault phases in distribution networks, which solves the problem that the large size of the complete set of devices in the prior art makes it impossible for the active voltage reduction and arc suppression devices for ground fault phases in distribution networks to pass through the small door at the installation site, thus affecting and restricting the installation and transportation process of the device.

[0005] To solve the above problems, the active voltage reduction and arc suppression device for ground fault phases in power distribution networks of this utility model adopts the following technical solution:

[0006] An active voltage reduction and arc suppression system for a single-phase ground fault in a power distribution network includes a housing and a neutral point grounding main circuit installed inside the housing. The neutral point grounding main circuit includes a grounding transformer, with the high-voltage neutral point of the grounding transformer connected to an adjustable-turn arc suppression coil. A disconnecting switch and a voltage transformer are connected in series between the high-voltage neutral point and the adjustable-turn arc suppression coil. The adjustable-turn arc suppression coil is grounded after being connected to a damping resistor, and a current transformer is configured on the grounding path of the damping resistor. The active voltage reduction and arc suppression system also includes an arc suppression coil control cabinet that controls the adjustable-turn arc suppression coil to achieve full voltage and current compensation for single-phase ground faults. The low-voltage side of the grounding transformer, the adjustable-turn arc suppression coil, the voltage transformer, and the secondary terminals of the current transformer are all connected to the arc suppression coil control cabinet. The housing is a split-type structure including left and right sub-boxes. The grounding transformer and the disconnecting switch are installed in the left sub-box, while the adjustable-turn arc suppression coil, the damping resistor, and the arc suppression coil control cabinet are installed in the right sub-box.

[0007] Furthermore, the different windings included in the adjustable arc suppression coil are arranged side by side in the left-right direction of the right-side sub-box, and the arc suppression coil control cabinet is located on the front side of the right-side sub-box near the door.

[0008] Furthermore, the damping resistor is positioned above the adjustable arc suppression coil.

[0009] Furthermore, the three-phase windings of the grounding transformer are arranged in the front-to-back direction of the left sub-box to make full use of the space in the front-to-back direction of the left sub-box.

[0010] Furthermore, the three-phase leads of the high-voltage side of the grounding transformer are connected in sequence to a high-voltage fuse and a double-winding voltage transformer, and are grounded by a grounding busbar. The high-voltage fuse and the double-winding voltage transformer are arranged in rows on the left side wall of the left side sub-box, one in front of the other, and one in the middle.

[0011] Furthermore, the disconnecting switch is located on the right side of the grounding transformer and near the front wall of the left sub-box. An operating handle for operating the disconnecting switch is provided on the outer side of the front wall. The operating handle is internally connected to the moving contact of the disconnecting switch through a transmission structure.

[0012] Furthermore, a surge arrester is connected to the high-voltage neutral point of the grounding transformer before connecting to the disconnecting switch. The surge arrester is located in the left sub-box and behind the disconnecting switch.

[0013] Furthermore, both sides of the left and right sub-compartments used for splicing are open structures to facilitate wiring between the left and right sub-compartments.

[0014] Furthermore, both the left and right sub-compartments are equipped with hoisting structures at their tops.

[0015] This invention, a pioneering creation, relates to an active voltage reduction and arc suppression system for ground fault phases in distribution networks. The beneficial effects of this system are as follows: The enclosure comprises a left and right sub-enclosure with a split, modular structure. The grounding transformer and disconnector, along with related equipment, are housed in the left sub-enclosure, while the adjustable arc suppression coil, damping resistor, and arc suppression coil control cabinet are located in the right sub-enclosure. This effectively isolates high-voltage and low-voltage electrical components, improving the safety of the active voltage reduction and arc suppression system for ground fault phases in distribution networks. Furthermore, the split structure allows for separate passageways through narrow doors during installation, enabling the left and right sub-enclosures to be assembled into a single unit. This enhances the flexibility and applicability of the enclosure, facilitating installation and transportation. Attached Figure Description

[0016] Figure 1 A schematic diagram of the active voltage reduction and arc suppression device for ground fault phases in power distribution networks provided by this utility model, with the top cover removed;

[0017] Figure 2 A schematic diagram of the box body provided by this utility model without the door panel;

[0018] Figure 3 for Figure 2 A structural diagram with the top right panel removed from the oblique, upward view.

[0019] Figure 4 A schematic diagram of the structure of the active voltage reduction and arc suppression device for grounding fault phase in the power distribution network provided by this utility model, with the top cover removed from the rear top view.

[0020] Figure 5 yes Figure 4 Enlarged schematic diagram of section A in the middle.

[0021] In the diagram: 2. Enclosure; 21. Left sub-enclosure; 22. Right sub-enclosure; 3. Grounding transformer; 4. Surge arrester; 5. Double-winding voltage transformer; 6. Single-winding voltage transformer; 8. Vacuum contactor; 9. High-voltage fuse; 10. Damping resistor; 11. Adjustable-turn arc suppression coil; 12. Arc suppression coil control cabinet; 13. Disconnecting switch; 14. Lifting connection ring; 15. Operating handle. Detailed Implementation

[0022] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0023] The original integrated housing has been improved into a split left and right compartment. The left and right compartments can be combined and disassembled. The grounding transformer and related equipment are placed in the left compartment, and the arc suppression coil control cabinet and related equipment are placed in the right compartment. This allows two large devices to be housed in two separate cabinets, enabling flexible combination or disassembly of the left and right compartments during disassembly, assembly, and transportation. After disassembly, the left and right compartments can be accessed through small doors at the installation site, ensuring that the entire active voltage reduction and arc suppression system for grounding fault phases in the distribution network is not affected or limited by the overall size.

[0024] Based on the main concepts above, different embodiments are provided below for illustration.

[0025] An embodiment of the active voltage reduction and arc suppression complete set of equipment for ground fault phases in power distribution networks according to this utility model is as follows:

[0026] In a basic scheme, refer to Figure 1-4 As shown, the system includes a housing 2 and a neutral point grounding main circuit installed inside the housing 2. The neutral point grounding main circuit includes a grounding transformer 3. The high-voltage neutral point of the grounding transformer 3 is connected to an adjustable-turn arc-suppression coil 11. A disconnecting switch 13 and a voltage transformer are connected in series between the high-voltage neutral point and the adjustable-turn arc-suppression coil 11. The adjustable-turn arc-suppression coil 11 is grounded after being connected to a damping resistor 10. A current transformer is configured on the grounding path of the damping resistor 10. The active voltage reduction arc-suppression complete set of equipment also includes a control unit for the adjustable-turn arc-suppression coil. 11. An arc suppression coil control cabinet 12 is used to achieve full compensation of voltage and current for single-phase grounding faults. The low-voltage side of the grounding transformer 3, the adjustable-turn arc suppression coil 11, the voltage transformer and the secondary terminals of the current transformer are all connected to the arc suppression coil control cabinet 12. The cabinet 2 is a split-type splicing structure including left and right sub-cabinets. The grounding transformer 3 and the disconnecting switch 13 are installed in the left sub-cabinet 21, and the adjustable-turn arc suppression coil 11, the damping resistor 10 and the arc suppression coil control cabinet 12 are installed in the right sub-cabinet 22.

[0027] In this embodiment, the enclosure 2 includes a left sub-enclosure 21 and a right sub-enclosure 22 with a split-type structure. The grounding transformer 3 and disconnector 13, along with other related equipment, are housed in the left sub-enclosure 21, while the adjustable-turn arc-suppression coil 11, damping resistor 10, and arc-suppression coil control cabinet 12 are housed in the right sub-enclosure 22. This separates the primary and secondary equipment physically, improving the safety of the active voltage reduction and arc-suppression system for ground fault phases in the distribution network. Furthermore, the split structure of the enclosure 2 allows the left and right sub-enclosures to be individually installed through narrow doors during installation. After entering the space within these doors, the left and right sub-enclosures are then combined into a single unit, enhancing the flexibility and applicability of the active voltage reduction and arc-suppression system for ground fault phases in the distribution network, and facilitating installation and transportation.

[0028] On the other hand, placing the arc suppression coil control cabinet 12 inside the enclosure 2 can improve the integrity and integration of the active voltage reduction arc suppression complete set of equipment for ground fault phases in the power distribution network, making the relative positions of the various electrical devices inside closer, thereby reducing the length of the connecting wires between them and reducing costs.

[0029] On the other hand, in embodiments where the arc suppression coil control cabinet 12 and the enclosure 2 are set up independently, the arc suppression coil control cabinet 12 needs to occupy a certain amount of space, resulting in a large area and space occupied by the entire distribution network ground fault active voltage reduction arc suppression complete set of equipment 1. Therefore, setting the arc suppression coil control cabinet 12 inside the enclosure 2 improves space utilization, thereby reducing the area and space occupied by the distribution network ground fault phase active voltage reduction arc suppression complete set of equipment, thus improving its applicability.

[0030] In actual production, the corresponding equipment is installed in the right sub-box 22 and the left sub-box 21 before the distribution network ground fault phase active voltage reduction and arc suppression complete set of equipment leaves the factory. Therefore, in the actual installation site, it is only necessary to move the left sub-box 21 and the right sub-box 22 to the required positions respectively, and then install and combine the left sub-box 21 and the right sub-box 22. This reduces the labor intensity of manual labor in the installation or disassembly process, and also facilitates the transportation and storage of the box 2.

[0031] In an optional embodiment of this utility model, threaded mounting holes are provided on the side where the right sub-box 22 and the left sub-box 21 are connected to each other, and the right sub-box 22 and the left sub-box 21 are connected by screws, which facilitates the assembly and disassembly of the box body 2.

[0032] In one embodiment, the high-voltage current in the neutral point main circuit is divided into three phases, so a three-phase winding is provided on the grounding transformer 3. The three-phase winding of the grounding transformer 3 is located in the left side distribution box 21 and arranged in the front-to-back direction within the left side distribution box 21. This allows for sufficient space on both sides of the grounding transformer 3 after its installation, facilitating the installation of other equipment.

[0033] Further, refer to Figure 1 and Figure 2 The three-phase windings of the grounding transformer 3 are equipped with three-phase leads for drawing out current. The three-phase leads on the high-voltage side of the grounding transformer 3 are connected to the upper ends of three high-voltage fuses 9 via copper busbars. The lower ends of the high-voltage fuses 9 are then connected to the upper ends of three corresponding double-winding voltage transformers 5 via copper busbars. The three high-voltage fuses 9 are arranged in a front-to-back direction on the left side wall of the left sub-box 21. The three double-winding voltage transformers 5 are also arranged in a front-to-back direction on the left side wall of the left sub-box 21. The double-winding voltage transformers 5 are finally grounded through the grounding busbar. Therefore, the high-voltage fuses 9 and double-winding voltage transformers 5 need to be arranged vertically. Since the three-phase windings of the grounding transformer 3 have some space to avoid in the left-to-right direction, the high-voltage fuses 9 and double-winding voltage transformers 5 are set on the left side wall of the left sub-box and arranged vertically to make full use of the space on the left side of the left sub-box 21, improve space utilization and integration, and reduce the size of the box 2.

[0034] In this embodiment, the high-voltage fuse 9 is used to provide fusible protection for the active voltage reduction and arc suppression complete set of equipment for the ground fault phase of the distribution network. When a fault or short circuit occurs in the distribution network circuit, the fusible metal on the high-voltage fuse 9 will melt due to excessive current, thereby achieving a protective effect.

[0035] Further, refer to Figure 2 and Figure 5By placing the disconnect switch 13 on the right side of the grounding transformer 3, the space on the right side of the grounding transformer 3 can be utilized more efficiently, improving the space utilization within the enclosure 2 and making the internal structure of the enclosure 2 more compact, thereby reducing the structural size of the enclosure 2. Positioning the disconnect switch 13 near the front wall of the left sub-enclosure 21 facilitates connection between the disconnect switch 13 and the operating handle 15 located on the outside of the left sub-enclosure 21. The operating handle 15 is connected to the moving contact of the disconnect switch 13 via a transmission structure, allowing the user to control the closing of the disconnect switch 13. On one hand, the user's control of the disconnect switch 13 within the enclosure 2 via the operating handle 15 is simple and convenient, facilitating operation; on the other hand, the user can complete the switching action by controlling the operating handle 15 without opening the cabinet door of the left sub-enclosure 21, improving safety. Furthermore, the fact that both the operating handle 15 and the disconnect switch 13 are located on the right side of the grounding transformer 3 allows the user to be positioned away from high-voltage equipment such as the grounding transformer 3, improving the safety of the operation process.

[0036] In this embodiment, the grounding transformer 3 has a high-voltage side neutral point provided by its own structure. The high-voltage side neutral point of the grounding transformer 3 is connected to the upper end of the disconnecting switch 13 via a copper busbar. The disconnecting switch 13 can easily cut off the power supply when a fault occurs in the distribution network, thereby achieving the protection effect of an active voltage reduction and arc suppression system for ground fault phases in the distribution network. At the same time, it can also protect the safety of personnel during maintenance.

[0037] The lower end of the disconnecting switch 13 is connected to the upper end of the single-winding voltage transformer 6 via a copper busbar, and the lower end of the single-winding voltage transformer 6 is grounded. The voltage data at this location is detected through the single-winding voltage transformer 6.

[0038] Further, refer to Figure 5 A surge arrester 4 is connected before the disconnecting switch 13 at the high-voltage neutral point of the grounding transformer 3. The surge arrester 4 is located in the left sub-box 21 and is situated behind the disconnecting switch 13. Because the grounding transformer 3 is located in the left sub-box 21, the space reserved on the right side of the grounding transformer 3 can also be used to install the surge arrester 4. This further utilizes the space on the right side of the grounding transformer 3, optimizes the spatial layout within the left sub-box 21, improves the integration and space utilization of the enclosure 2, and reduces the overall size of the enclosure 2.

[0039] In this embodiment, surge arrester 4 is also connected to the upper end of disconnector switch 13. Surge arrester 4 is mainly used to quickly conduct voltage to the ground through its nonlinear resistance characteristics when the active voltage reduction and arc suppression system of the ground fault phase in the distribution network is struck by lightning or has internal overvoltage, thus protecting the active voltage reduction and arc suppression system of the ground fault phase in the distribution network.

[0040] In one embodiment, reference Figure 3 The adjustable-turn arc suppression coil 11 is installed inside the right-side compartment 22, and the different windings of the adjustable-turn arc suppression coil 11 are arranged side by side in the left-right direction of the right-side compartment 22. This saves space in the front-back and vertical directions inside the right-side compartment 22, facilitating the installation of other equipment. Specifically, the arc suppression coil control cabinet 12 is installed in the front space of the left-side compartment 21, which is cleared by the adjustable-turn arc suppression coil 11, to improve the space utilization rate inside the box 2, making the overall structure more compact, thereby reducing the size and volume of the box 2, while also facilitating monitoring and operation.

[0041] In this embodiment, the arc suppression coil control cabinet 12 is mainly used to detect the operating status of the power distribution network system in real time and to control the adjustable-turn arc suppression coil 11 to accurately identify and select the faulty line. The adjustable-turn arc suppression coil 11 is mainly used to compensate for the capacitor current by providing an inductive current in the opposite direction to the capacitor current at the fault point when a single-phase ground fault occurs in the power distribution network, thereby achieving the effect of eliminating the arc protection circuit.

[0042] Further, refer to Figure 1 and Figure 3 The adjustable-turn arc suppression coil 11 is set on the bottom plate of the right-side distribution box 22. A damping resistor bracket is set above the adjustable-turn arc suppression coil 11 in the vertical direction. A damping resistor 10 is installed on the damping resistor bracket. The damping resistor 10 makes full use of the space above the adjustable-turn arc suppression coil 11, optimizes the spatial layout in the right-side distribution box 22, and improves the integration of the active voltage reduction arc suppression complete set of equipment for ground fault phases in the distribution network.

[0043] In this embodiment, the upper end of the single-winding voltage transformer 6 is connected to the A end of the adjustable-turn arc suppression coil 11 via a copper busbar or a high-voltage cable. The X end of the adjustable-turn arc suppression coil 11 is connected to the damping resistor 10 at the top via a high-voltage cable, and the damping resistor 10 is grounded via a grounding wire. The damping resistor 10 is used to prevent the adjustable-turn arc suppression coil 11 from being damaged by resonant voltage through its own resistance characteristics.

[0044] Furthermore, the end of the damping resistor 10 is grounded through a grounding wire passing through the current transformer. The secondary terminals of the grounding transformer 3, the adjustable-turn arc suppression coil 11, the single-winding voltage transformer 6, and the current transformer are connected to the interior of the arc suppression coil control cabinet 12 via cables. In the distribution network system, when a single-phase ground fault occurs, the fault current will form a loop through the ground, generating a zero-sequence current. The current transformer can capture this current change and generate an electrical signal at its secondary terminal. Therefore, the secondary terminal of the current transformer is connected inside the arc suppression coil control cabinet 12, allowing personnel to understand the system fault situation through the arc suppression coil control cabinet 12.

[0045] Furthermore, the left and right sub-compartments 21 and 22 each have open sides, facilitating electrical connections between the equipment within them and preventing any interference with these connections. The open design also allows for easy connection and installation between the left and right sub-compartments 21 and 22, providing users with a clear view of the installation process. After the left and right sub-compartments 21 and 22 are assembled, they form a complete enclosed enclosure 2.

[0046] In this embodiment, the left compartment 21 and the right compartment 22 can be completely open openings formed by directly not setting side panels on the two opposite sides. In another embodiment, a partial partition structure can be provided on one of the two opposite sides of the left compartment 21 and the right compartment 22 to form a partially open opening structure.

[0047] refer to Figure 2 Lifting structures are installed at the top of both the left sub-cabinet 21 and the right sub-cabinet 22. The preferred lifting structure is a lifting connecting ring 14, which facilitates the lifting and movement of the enclosure 2 by external equipment, thus simplifying the installation of the enclosure 2. Besides the aforementioned installation of the lifting connecting ring 14, the lifting structure can also be a hook installed at the top of the left sub-cabinet 21 and the pressure cabinet.

[0048] Lifting structures can be installed on the top and / or outer surfaces of the left sub-compartment 21 and the right sub-compartment 22. In one scenario, multiple lifting structures are installed on the top surfaces of the left sub-compartment 21 and the right sub-compartment 22. In another scenario, multiple lifting structures are installed on the outer surfaces of the left sub-compartment 21 and the right sub-compartment 22.

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. The scope of patent protection of this utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of this utility model shall also be included within the scope of protection of this utility model.

Claims

1. A complete set of power distribution network grounding fault phase active voltage reduction arc extinction device, characterized in that, The system includes a housing and a neutral point grounding main circuit installed inside the housing. The neutral point grounding main circuit includes a grounding transformer. The high-voltage neutral point of the grounding transformer is connected to an adjustable-turn arc suppression coil. A disconnecting switch and a voltage transformer are connected in series between the high-voltage neutral point and the adjustable-turn arc suppression coil. The adjustable-turn arc suppression coil is grounded after being connected to a damping resistor. A current transformer is configured on the grounding path of the damping resistor. The active voltage reduction arc suppression complete set of equipment also includes an arc suppression coil measurement and control cabinet that controls the adjustable-turn arc suppression coil to achieve full compensation of voltage and current for single-phase grounding faults. The low-voltage side of the grounding transformer, the adjustable-turn arc suppression coil, the voltage transformer, and the secondary terminals of the current transformer are all connected to the arc suppression coil measurement and control cabinet. The housing is a split-type splicing structure including left and right sub-boxes. The grounding transformer and disconnecting switch are installed in the left sub-box, and the adjustable-turn arc suppression coil, damping resistor, and arc suppression coil measurement and control cabinet are installed in the right sub-box.

2. The complete set of power distribution network grounding fault phase-voltage-reducing arc-extinguishing device according to claim 1, characterized in that, The different windings contained in the adjustable arc suppression coil are arranged side by side in the left and right direction of the right side compartment, and the arc suppression coil control cabinet is located on the front side of the right side compartment near the door.

3. The complete set of power distribution network grounding fault phase active voltage reduction arc extinction device according to claim 2, characterized in that, The damping resistor is positioned above the adjustable arc suppression coil.

4. The complete set of power distribution network grounding fault phase-voltage-reducing arc-extinguishing device according to claim 1, characterized in that, The three-phase windings of the grounding transformer are arranged in the front-to-back direction of the left sub-box to make full use of the space in the front-to-back direction of the left sub-box.

5. The complete set of power distribution network grounding fault phase-voltage-reducing arc-extinguishing device according to claim 4, characterized in that, The high-voltage side three-phase leads of the grounding transformer are connected in sequence to a high-voltage fuse and a double-winding voltage transformer, and are grounded by a grounding busbar. The high-voltage fuse and the double-winding voltage transformer are arranged in rows on the left side wall of the left side sub-box, one in front of the other, and one in the middle.

6. The complete set of power distribution network ground fault phase active voltage reduction arc extinction device according to claim 5, characterized in that, The disconnecting switch is located on the right side of the grounding transformer and near the front wall of the left sub-box. An operating handle for operating the disconnecting switch is provided on the outer side of the front wall. The operating handle is internally connected to the moving contact of the disconnecting switch through a transmission structure.

7. The complete set of power distribution network ground fault phase active voltage reduction arc extinction device according to claim 6, characterized in that, The high-voltage neutral point of the grounding transformer is connected to a surge arrester before the disconnecting switch. The surge arrester is located in the left sub-box and behind the disconnecting switch.

8. The complete set of power distribution network grounding fault phase active voltage reduction arc extinction device according to any one of claims 1-7, characterized in that, Both sides of the left and right sub-compartments used for splicing are open structures to facilitate wiring between the left and right sub-compartments.

9. The complete set of power distribution network grounding fault phase active voltage reduction arc extinction device according to any one of claims 1-7, characterized in that, Both the left and right sub-compartments are equipped with hoisting structures at their tops.

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