DDS function module and state switching device thereof

Abstract

The invention relates to a DDS (Direct Digital Synthesizer) functional module, which comprises a shell, a double-break isolating switch and an auxiliary grounding device, and a state switching device which is used for switching three operation states of the DDS function module and preventing the double-break isolation switch and the auxiliary grounding device from being switched on at the same time is also arranged in the shell. The double-fracture isolation switch comprises an operation side static contact, an extension side static contact, a common moving contact shell and a pair of fracture conduction rods which are movably inserted into the two ends of the common moving contact shell. The auxiliary grounding device comprises a grounding static contact, a grounding moving contact shell and a grounding conduction rod movably inserted into the grounding moving contact shell; the state switching device comprises a transmission assembly which is used for driving the fracture conduction rod to stretch out or retract and driving the grounding conduction rod to retract or stretch out at the same time. According to the invention, all three operation modes required after the GIS is expanded, tested and put into operation without power failure can be satisfied, and the misoperation of simultaneous conduction of the double-break isolation switch and the auxiliary grounding device is fundamentally avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of power grid construction. Background Art

[0002] The DDS function module of the gas-insulated switchgear GIS double-break disconnector is an important GIS non-stop expansion equipment. It has received extensive attention and design and development in the context of the increasing continuity of GIS and substation operation. The equipment is equipped with two linked disconnector moving contacts and static contacts on the bus side and expansion side to form two open and closed breaks between the moving and static contacts, and an auxiliary grounding device is provided between the two breaks to ensure safe grounding during construction and expansion. Using the DDS function module constructed in the first phase, the bus side of the GIS does not need to be shut down during the second phase expansion and insulation test, thereby avoiding the bus power outage of the substation or even the simultaneous shutdown of the double busbars during the expansion project and emergency repair, greatly reducing the scope of power outage, reducing the difficulty of work approval, shortening the construction period and improving safety.

[0003] The inventor has found through research that the double-break disconnector and the auxiliary grounding device in the DDS functional module must be strictly prohibited from closing or opening at the same time to ensure safety and avoid metallic short-circuit faults. However, in the current various designs of DDS, the moving contacts of the double-break disconnector and the moving contacts of the auxiliary grounding device use external electrical locking mechanisms with relatively weak reliability and anti-false operation performance to achieve the locking of the two. In addition, in the design of most DDS functional modules, the auxiliary grounding device is only used as a manual operating device during expansion and testing rather than an operating device. At this time, it is necessary to lock the external operating mechanism and the operation and maintenance personnel need to actively follow the regulations to avoid misoperation, which further increases the uncontrollable safety hazards. There is a possibility of a malignant accident that the closing of the auxiliary grounding device under the power state causes a short circuit due to misoperation and electrical linkage failure. The above problems make the previous DDS functional modules still have the hidden dangers of misoperation and misgrounding during actual expansion, testing and normal operation, thus limiting the promotion of DDS functional modules. Summary of the invention

[0004] The object of the present invention is to provide a DDS functional module, which can achieve the purpose of satisfying its application in expansion and testing while leaving no safety hazards in normal operation through mechanical linkage between the moving contact of the double-break disconnector and the moving contact of the auxiliary grounding device.

[0005] The technical solution adopted by the present invention is: a DDS functional module, including a shell, a double-break disconnector arranged in the shell, and an auxiliary grounding device; the shell is also provided with a state switching device for switching between three operating states of the DDS functional module and preventing the double-break disconnector and the auxiliary grounding device from being closed at the same time.

[0006] The three operating states of the DDS functional module are closed state, open state, and grounded state; the closed state is that the double-break disconnector is closed and the auxiliary grounding device is open; the open state is that the double-break disconnector is open and the auxiliary grounding device is open; the grounded state is that the double-break disconnector is open and the auxiliary grounding device is closed.

[0007] The double-break disconnector includes a running-side static contact, an expansion-side static contact, and a common moving contact; the common moving contact includes a common moving contact housing and a pair of break conduction rods movably inserted at both ends of the common moving contact housing; The auxiliary grounding device includes a grounding static contact and a grounding movable contact; the grounding movable contact includes a grounding movable contact shell and a grounding conducting rod movably inserted in the grounding movable contact shell; The state switching device comprises a transmission assembly for driving the break conduction rod to extend / retract and driving the ground conduction rod to retract / extend at the same time.

[0008] The transmission assembly includes a transmission shaft 1 which is rotatably connected to a common moving contact housing via a bearing and a bearing liner to drive a fracture conducting rod to extend / retract, and a transmission shaft 2 which is rotatably connected to a grounding moving contact housing via a bearing and a bearing liner to drive a grounding conducting rod to extend / retract.

[0009] The transmission shaft 1 is provided with a gear 1, and the fracture conducting rod is provided with a rack 1 meshing with the gear 1 for transmission; the transmission shaft 2 is provided with a gear 2, and the grounding conducting rod is provided with a rack 2 meshing with the gear 2 for transmission.

[0010] The transmission shaft 1 is transmission-connected to the transmission shaft 2 via an insulating connector; the transmission shaft 2 is transmission-connected to the driving connecting rod via an insulating connector.

[0011] The state switching device also includes an operating mechanism connected to the transmission assembly.

[0012] On the other hand, the present invention provides a DDS functional module state switching device, which is used to switch between three operating states of the DDS functional module and prevent the double-break disconnector and the auxiliary grounding device from being closed at the same time; the state switching device includes a transmission component for driving the break conduction rod of the double-break disconnector to extend / retract while driving the grounding conduction rod of the auxiliary grounding device to retract / extend.

[0013] The transmission assembly includes a transmission shaft 1 which is rotatably connected to a common moving contact housing via a bearing and a bearing liner to drive a fracture conducting rod to extend / retract, and a transmission shaft 2 which is rotatably connected to a grounding moving contact housing via a bearing and a bearing liner to drive a grounding conducting rod to extend / retract.

[0014] The transmission shaft 1 is provided with a gear 1, and the fracture conducting rod is provided with a rack 1 meshing with the gear 1 for transmission; the transmission shaft 2 is provided with a gear 2, and the grounding conducting rod is provided with a rack 2 meshing with the gear 2 for transmission.

[0015] The transmission shaft 1 is transmission-connected to the transmission shaft 2 via an insulating connector; the transmission shaft 2 is transmission-connected to the driving connecting rod via an insulating connector.

[0016] The state switching device also includes an operating mechanism connected to the transmission assembly.

[0017] The present invention forms a reverse linkage between the two moving contacts of the double-break disconnector and one moving contact of the auxiliary grounding device through a gear rack and a connecting rod, that is, the opening and closing movement direction of the moving contact of the double-break disconnector is opposite to the opening and closing movement direction of the moving contact of the auxiliary grounding device, so as to realize the mechanical linkage of the two moving contacts. The present invention can realize all three operation modes required by the DDS function module during the non-stop expansion, testing and commissioning of GIS, and can fundamentally avoid the erroneous operation of the double-break disconnector and the auxiliary grounding device being turned on at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural diagram of the DDS functional module of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal structure of the DDS functional module of the present invention.

[0021] Figure 3 It is the front view of the DDS functional module of the present invention.

[0022] Figure 4 yes Figure 3 EE cross-sectional view.

[0023] Figure 5 yes Figure 3 FF cross-sectional view.

[0024] Figure 6 It is a schematic diagram of the closed state of the DDS functional module of the present invention.

[0025] Figure 7 It is a schematic diagram of the DDS functional module of the present invention in the open state.

[0026] Figure 8 It is a schematic diagram of the grounding state of the DDS functional module of the present invention.

[0027] Fig. 9 It is a schematic diagram of the disconnector from closing to opening according to the present invention.

[0028] Fig.10 It is a schematic diagram of the closing to opening operating mechanism of the isolating switch of the present invention.

[0029] Fig.11 It is a schematic diagram of the main electrical connections of the isolating switch of the present invention in the closed state.

[0030] Fig.12 It is a schematic diagram of the disconnector from opening to closing of the present invention.

[0031] Fig.13 It is a schematic diagram of the disconnector opening to closing operating mechanism of the present invention.

[0032] Fig.14 It is a schematic diagram of the main electrical connections of the isolating switch of the present invention in the open state.

[0033] Fig.15 It is a schematic diagram of the disconnecting switch of the present invention being opened to auxiliary grounding.

[0034] Fig.16 It is a schematic diagram of the disconnect switch opening to auxiliary grounding operating mechanism of the present invention.

[0035] Fig.17 It is a schematic diagram of the main electrical connections of the auxiliary grounding state of the isolating switch of the present invention.

[0036] Fig.18 It is a schematic diagram of the auxiliary grounding to the disconnection switch of the present invention.

[0037] Fig.19 It is a schematic diagram of the operating mechanism principle of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present invention.

[0039] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification. Example 1

[0040] This embodiment provides a GIS DDS functional module in which the moving contact of a double-break disconnector and the moving contact of an auxiliary grounding device are mechanically linked internally. Figure 1-5 As shown, it includes a shell 1, a double-break disconnector 2 arranged in the shell 1, and an auxiliary grounding device 3; the shell 1 is also provided with a state switching device 4 for switching between three operating states of the DDS functional module and preventing the double-break disconnector 2 and the auxiliary grounding device 3 from being closed at the same time.

[0041] The double-break disconnector 2 comprises a running-side static contact 201 , an expansion-side static contact 202 , and a common moving contact 203 ; the common moving contact 203 comprises a common moving contact housing 2031 , and a pair of break conducting rods 2032 movably inserted at both ends of the common moving contact housing 2031 .

[0042] The auxiliary grounding device 3 comprises a grounding static contact 301 and a grounding movable contact 302 ; the grounding movable contact 302 comprises a grounding movable contact shell 3021 and a grounding conducting rod 3022 movably inserted into the grounding movable contact shell 3021 .

[0043] The state switching device 4 includes a transmission assembly 41 for driving the break conduction rod 2032 to extend / retract and the ground conduction rod 2032 to retract / extend. The transmission assembly 41 includes a transmission shaft 1 4101 rotatably connected to the common moving contact housing 2031 via a bearing 4110 and a bearing bushing 4109 for driving the break conduction rod 2032 to extend / retract, and a transmission shaft 2 4102 rotatably connected to the ground moving contact housing 3021 via a bearing and a bearing bushing for driving the ground conduction rod 3022 to extend / retract.

[0044] Transmission shaft 1 4101 is provided with gear 1 4105, and the fracture conducting rod 2032 is provided with rack 1 4106 meshing with gear 1; transmission shaft 2 4102 is provided with gear 2 4107, and the ground conducting rod 3022 is provided with rack 2 meshing with gear 2. Transmission shaft 1 4101 is connected to transmission shaft 2 4102 through insulating connector 4103; transmission shaft 2 4102 is connected to driving connecting rod 4104 through insulating connector 4103.

[0045] The two moving contacts of the double-break disconnector and one moving contact of the auxiliary grounding device are reversely linked through a gear rack and a connecting rod, that is, the opening and closing movement direction of the moving contact of the double-break disconnector is opposite to the opening and closing movement direction of the moving contact of the auxiliary grounding device, so as to realize the mechanical linkage of the two moving contacts. The present invention can realize all three operation modes required by the DDS function module during the non-stop expansion, testing and commissioning of GIS, and can fundamentally avoid the erroneous operation of the double-break disconnector and the auxiliary grounding device being turned on at the same time.

[0046] The above three operation modes include: 1) Close the isolating switch (such as Figure 6 As shown): the double-break disconnector is closed and the auxiliary grounding device is opened; 2) Disconnector is open (e.g. Figure 7 As shown): the double-break disconnector is open, and the auxiliary grounding device is open; 3) Auxiliary grounding (such as Figure 8 As shown): the double-break disconnector is opened and the auxiliary grounding device is closed. This method is only used for non-stop expansion, testing or maintenance, and is not used after commissioning.

[0047] When the isolating switch is in the open state, the top of the moving contact of the double-break isolating switch is parallel to the edge of the contact shell, and the top of the moving contact of the auxiliary grounding device is also parallel to the edge of the contact shell.

[0048] The moving contact of the double-break disconnector and the moving contact of the auxiliary grounding device are arranged vertically. The two moving contacts of the double-break disconnector can contact the static contacts on the bus side and the expansion side to form a closed circuit, and the moving contact of the auxiliary grounding device can contact the static contact of the auxiliary grounding device grounded at the bottom of the shell to form a grounding. The static contacts on the bus side and the expansion side are installed in the pot insulator.

[0049] The moving contact of the double-break disconnector and the moving contact of the auxiliary grounding device are located in the contact shell and can move linearly in the contact shell. Additional movement space is added inside the contact shells of the two, so that the length of the contact shell is greater than the length of the moving contact, so that the two moving contacts of the double-break disconnector can be further retracted into the contact shell in its open state, providing a stroke for the moving contact of the auxiliary grounding device linked with it to extend and contact the grounding static contact. Similarly, this content can also make the moving contact of the auxiliary grounding device further retracted into the contact shell in its open state, providing the necessary stroke for the two moving contacts of the double-break disconnector linked with it to examine and contact the static contacts on the bus side and the expansion side.

[0050] The contact shells of the moving contacts of the double-break disconnector and the auxiliary earthing device are fixed on the housing by support insulators.

[0051] The linkage mechanism between the double-break disconnector and the moving contact of the auxiliary earthing device is a conductor, and the linkage mechanism between the moving contact and the housing operating mechanism is an insulating member.

[0052] The transmission component of the moving contact of the double-break disconnector and the auxiliary earthing device is a rack, and the operating mechanism drives the gear to drive the rack mechanism to perform linear motion.

[0053] The state switching device 4 also includes an operating mechanism connected to the transmission assembly 41 and used to drive the driving connecting rod 4104 to rotate.

[0054] The operating mechanism is divided into an electric mechanism and a manual mechanism. Among them, a rotation limit device is provided in the operating mechanism, which is composed of an operating connecting rod connected to the driving connecting rod 4104, a rotating contact and a switch-off contact. The connecting rod drives the rotating contact to rotate. The rotating contact does not contact the switch-off contact when closing the switch, and the switch-off circuit in the electric mechanism is normally connected; after the switch-off is in place, the switch-off control circuit of the electric mechanism is cut off, and the switch-off control circuit of the electric mechanism is not cut off. This function allows the DDS function module to switch between the two states of closing after commissioning and opening after commissioning when using the electric mechanism, but cannot switch to the auxiliary grounding state. The manual mechanism is used for expansion, testing or maintenance without power outage, and there is no travel limit. Even if the switch-off circuit in the electric mechanism is in place due to the switch-off, the DDS function module can switch between all three states. This setting is to ensure that the auxiliary grounding device can only be closed during expansion, testing or maintenance.

[0055] The principles of electric mechanism and manual mechanism refer to Fig.10 , 13 , 16, 19. Among them, the manual mechanism includes a crank and a motor shaft. When manual operation is required, the crank is inserted into the motor shaft and rotated to drive the motor speed gear to rotate, and then drive the drive connecting rod speed gear to rotate, and finally the drive connecting rod (4104) rotates, thereby switching the DDS to one of the three states of "closing", "opening", and "auxiliary grounding". The electric mechanism includes a motor and an opening and closing control circuit, wherein the opening control circuit includes three switch elements in series, namely, an opening operation button, an opening in place contact, and a locking node; and the closing control circuit only has two switch elements in series, namely, a closing operation button and a locking node. Only when all the switch elements in the above-mentioned opening and closing control circuits are in the closed state, will the motor be started and the speed gear will be driven to complete the opening and closing operations, switching the DDS to one of the two states of "closing" and "opening". Among them, the opening and closing signals of the locking node come from other components of the GIS, such as grounding switches, circuit breakers, etc.

[0056] See also Figure 9-11 , disconnector closed to open: This operation can be completed through manual or electric operating mechanisms and can be performed after the DDS functional module is put into operation or during expansion, testing, and maintenance.

[0057] Rotate the operating mechanism counterclockwise, and through the operating connecting rod, the gear drives the two moving contacts of the double-break disconnector to move inward, and the moving contact of the auxiliary grounding device to move outward, until the two moving contact ends of the double-break disconnector move parallel to the contact shell, and the moving contact of the auxiliary grounding device is also parallel to the contact shell. At this time, the switching of the disconnector from closing to opening is completed. At the operating mechanism, there is an opening contact. After being contacted by the shaft contact on the operating mechanism, the contact will disconnect the opening control circuit of the electric operating mechanism, and then stop the electric operation, so that the DDS cannot be switched to the auxiliary grounding state by the electric operating mechanism alone. Externally, the contact position can be indicated by the opening and closing indicator on the operating mechanism. The opening and closing indicator can indicate the three states of "closing", "opening" and "auxiliary grounding". At this time, the state is "opening". (Note: Fig. 9 , 12 The dotted lines in 15 and 18 are used to indicate the position of the front end of the moving contact).

[0058] See also Figure 12-14 , disconnector opening to closing: This operation can be completed through manual or electric operating mechanisms and can be performed after the DDS functional module is put into operation or during expansion, testing, and maintenance.

[0059] Rotate the operating mechanism clockwise, and the gear drives the two moving contacts of the double-break disconnector to move outward through the connecting rod, and the moving contact of the auxiliary grounding device moves inward, until the two moving contacts of the double-break disconnector are in good contact with the static contacts on both sides, and the moving contact of the auxiliary grounding device is completely retracted. At this time, the switching from closing to opening of the disconnector is completed.

[0060] See also Figure 15-17 , disconnect switch opens to auxiliary grounding: This operation can only be completed by the manual operating mechanism. There is a travel limiter in the electric operating mechanism to avoid this operation, and this operation is not set in the travel control software and hardware of the electric operating mechanism. At this time, the opening contact is always in contact, and the opening control circuit of the electric operating mechanism is disconnected.

[0061] Rotate the operating mechanism counterclockwise, and the gear drives the two moving contacts of the double-break disconnector to move inward through the connecting rod, and moves the moving contact of the auxiliary grounding device outward until the moving contact of the auxiliary grounding device is in good contact with the grounding static contact, and the moving contact of the double-break disconnector is completely retracted. In this process, even if the opening contact is in contact and the opening control circuit of the electric operating mechanism is cut off, the manual operating mechanism can continue to operate the moving contact to switch it to the auxiliary grounding state. At this time, the switching from the opening of the disconnector to the auxiliary grounding is completed. In this state, there are two breaks between the static contact on the bus side and the static contact on the expansion side, and there is auxiliary grounding between the two breaks. Therefore, the expansion, insulation test and maintenance work on the expansion side can be carried out safely without power outage on the bus side.

[0062] It is worth noting that even if the electric operating mechanism performs the operation of opening the disconnector to auxiliary grounding after commissioning due to product quality, operating mechanism installation errors and software and hardware setting errors, it will not cause the disconnector to short-circuit and will have no impact on the operation of the power grid.

[0063] See also Fig.19 , auxiliary grounding to disconnect switch opening: This operation can only be completed by the manual operating mechanism, and the travel control software and hardware of the electric operating mechanism do not have this operation. At this time, the opening contact is always in contact, and the opening control circuit of the electric operating mechanism is disconnected.

[0064] Rotate the operating mechanism clockwise, and the gear drives the two moving contacts of the double-break disconnector to move outward through the connecting rod, and the moving contact of the auxiliary grounding device moves inward, until the two moving contact ends of the double-break disconnector move to parallel with the contact shell, and the moving contact of the auxiliary grounding device is also parallel to the contact shell. At this time, the switching from auxiliary grounding to disconnection of the disconnector is completed. Externally, the contact position can be indicated by the opening and closing device on the operating mechanism, and the state is "open".

[0065] Aiming at the problem that the moving contact of the double-break disconnector and the moving contact of the auxiliary grounding device in the current GIS double-break disconnector function module (DDS) only has electrical interlocking, the present invention proposes a GISDDS function module that can realize mechanical linkage between the moving contact of the double-break disconnector and the moving contact of the auxiliary grounding device internally through the coaxial connecting rod and the stroke limit of the operating mechanism, while meeting the requirements of normal operation and construction test. Compared with the previous electromagnetic interlocking function module, the proposed DDS function module has higher reliability and anti-false operation performance, and has a compact structure and small space occupation, and does not require changes to the secondary circuit and operating procedures. Example 2

[0066] The present embodiment provides a DDS function module state switching device, which is used for switching between three operating states of the DDS function module and preventing the double-break disconnector 2 and the auxiliary grounding device 3 from being closed at the same time.

[0067] The state switching device includes a transmission assembly 41 for driving the break conducting rod 2032 of the double-break disconnector 2 to extend / retract and driving the grounding conducting rod 2032 of the auxiliary grounding device 3 to retract / extend. Figure 4 , Figure 5 The transmission assembly 41 includes a transmission shaft 1 4101 which is rotatably connected to the common moving contact housing 2031 through a bearing 4110 and a bearing liner 4109 to drive the break conduction rod 2032 to extend / retract, and a transmission shaft 2 4102 which is rotatably connected to the ground moving contact housing 3021 through a bearing and a bearing liner to drive the ground conduction rod 3022 to extend / retract. A gear 1 4105 is provided on the transmission shaft 1 4101, and a rack 1 4106 which meshes with the gear 1 is provided on the break conduction rod 2032; a gear 2 4107 is provided on the transmission shaft 2 4102, and a rack 2 4108 which meshes with the gear 2 is provided on the ground conduction rod 3022. The transmission shaft 1 4101 is transmission-connected to the transmission shaft 2 4102 through an insulating connector 4103; and the transmission shaft 2 4102 is transmission-connected to the driving connecting rod 4104 through an insulating connector 4103. The state switching device 4 also includes an operating mechanism connected to the transmission assembly 41 .

[0068] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A DDS functional module, characterized in that: The invention comprises a housing (1), a double-break isolating switch (2) arranged in the housing (1), and an auxiliary grounding device (3); the housing (1) is also provided with a state switching device (4) for switching three operating states of a DDS functional module and preventing the double-break isolating switch (2) and the auxiliary grounding device (3) from being closed simultaneously.

2. The DDS functional module according to claim 1, characterized in that: The three operating states of the DDS functional module are closed state, open state, and grounding state; the closed state means that the double-break disconnector is closed and the auxiliary grounding device is open; the open state means that the double-break disconnector is open and the auxiliary grounding device is open; The grounding state is that the double-break disconnector is open and the auxiliary grounding device is closed.

3. The DDS functional module according to claim 1, characterized in that: The double-break disconnector (2) comprises an operating-side static contact (201), an expansion-side static contact (202), and a common moving contact (203); the common moving contact (203) comprises a common moving contact housing (2031), and a pair of break conduction rods (2032) movably inserted at both ends of the common moving contact housing (2031); The auxiliary grounding device (3) comprises a grounding static contact (301) and a grounding movable contact (302); the grounding movable contact (302) comprises a grounding movable contact shell (3021) and a grounding conducting rod (3022) movably inserted into the grounding movable contact shell (3021); The state switching device (4) comprises a transmission assembly (41) for driving the break conduction rod (2032) to extend / retract and, at the same time, driving the ground conduction rod (2032) to retract / extend.

4. The DDS functional module according to claim 3, characterized in that: The transmission assembly (41) comprises a first transmission shaft (4101) rotatably connected to the common moving contact housing (2031) for driving the broken conducting rod (2032) to extend / retract, and a second transmission shaft (4102) rotatably connected to the grounding moving contact housing (3021) for driving the grounding conducting rod (3022) to extend / retract.

5. The DDS functional module according to claim 4, characterized in that: The transmission shaft one (4101) is provided with a gear one (4105), and the fracture conduction rod (2032) is provided with a rack one (4106) meshing with the gear one for transmission; the transmission shaft two (4102) is provided with a gear two (4107), and the ground conduction rod (3022) is provided with a rack two meshing with the gear two for transmission.

6. The DDS functional module according to claim 4, characterized in that: The transmission shaft 1 (4101) is transmission-connected to the transmission shaft 2 (4102) via the insulating connecting piece (4103); the transmission shaft 2 (4102) is transmission-connected to the driving connecting rod (4104) via the insulating connecting piece (4103).

7. The DDS functional module according to claim 3, characterized in that: The state switching device (4) also includes an operating mechanism connected to the transmission assembly (41).

8. A DDS function module state switching device, characterized in that: The state switching device is used for switching between three operating states of a DDS functional module and preventing the double-break disconnector (2) and the auxiliary grounding device (3) from being closed simultaneously; the state switching device comprises a transmission assembly (41) for driving the break conduction rod (2032) of the double-break disconnector (2) to extend / retract and driving the ground conduction rod (2032) of the auxiliary grounding device (3) to retract / extend simultaneously.

9. The DDS function module state switching device according to claim 8, characterized in that: The transmission assembly (41) comprises a first transmission shaft (4101) rotatably connected to the common moving contact housing (2031) for driving the broken conducting rod (2032) to extend / retract, and a second transmission shaft (4102) rotatably connected to the grounding moving contact housing (3021) for driving the grounding conducting rod (3022) to extend / retract.

10. The DDS function module state switching device according to claim 9, characterized in that: The transmission shaft one (4101) is provided with a gear one (4105), and the broken conductive rod (2032) is provided with a rack one (4106) meshing with the gear one for transmission; the transmission shaft two (4102) is provided with a gear two (4107), and the grounding conductive rod (3022) is provided with a rack two (4108) meshing with the gear two for transmission.

11. The DDS function module state switching device according to claim 9, characterized in that: The transmission shaft 1 (4101) is transmission-connected to the transmission shaft 2 (4102) via the insulating connecting piece (4103); the transmission shaft 2 (4102) is transmission-connected to the driving connecting rod (4104) via the insulating connecting piece (4103).

12. The DDS function module state switching device according to claim 8, characterized in that: The state switching device (4) also includes an operating mechanism connected to the transmission assembly (41).

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