Transformer neutral point isolation switch

Abstract

The invention discloses a transformer neutral point isolation switch, and belongs to the technical field of neutral point isolation. A transformer neutral point disconnecting switch comprises a supporting stand column and further comprises fixed channel steel. The conductive structure comprises a connecting steel plate rotatably connected to the top of the insulator, a moving contact installed on the outer side of the connecting steel plate, a contact piece installed on the inner side of the moving contact, a static contact which sleeves the outer side of the moving contact and is in threaded connection with the connecting steel plate, a grounding switch installed between the moving contact and the connecting steel plate, and a grounding rod sliding in the grounding switch. The rotating plate is arranged at the lower part of the grounding rod; the transmission assembly is arranged at one end of the rotating plate; the connecting steel plate is quickly and mechanically separated from the moving contact and the static contact through the bearing seat, the action is quick, the rotating plate and the grounding rod connected with the rotating plate are linked to rotate inwards together and accurately move to the position of the grounding switch, and compressed air is introduced into the contact piece to physically lengthen the electric arc, so that the electric arc is prevented from being damaged. And the arc discharge phenomenon is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of neutral point isolation, and in particular to a transformer neutral point isolation switch. Background Art

[0002] Neutral point isolating switches are generally used for grounding the neutral point of transformers. They are single-phase and electrically operated. Ordinary isolating switches include main and ground switches, three-phase. Neutral point isolating switches can prevent damage to transformers caused by increased neutral point voltage of transformers due to system failures. Traditional neutral point isolating switches have a single range of behavior, and different voltage specifications can only be applied to corresponding voltage specifications. If the voltage specifications of the isolating switches do not match, the switch device needs to be replaced. The isolating switch connected to the neutral point of the transformer is mainly used to isolate the neutral point of the transformer. When a transformer fails, the neutral point connection of the transformer can be quickly disconnected to isolate the transformer from the power grid to prevent the fault from expanding. At the same time, it can also prevent faults in other parts of the power grid from affecting the transformer.

[0003] After searching, the Chinese patent application number CN203983956U discloses a transformer neutral point isolating switch device, which integrates neutral rod gap, gap current transformer, isolating switch, lightning arrester and mounting bracket and other electrical equipment into a transformer neutral point complete set of equipment. Users can choose a pure gap transformer neutral point overvoltage protection scheme, or a gap and lightning arrester working in parallel for coordinated protection. The lightning arrester and the isolating switch can be flexibly assembled according to the needs of the project, and the operating mechanism of the isolating switch can be selected manual or electric.

[0004] The above patent still has the following deficiencies: the neutral point disconnector of this device does not have an arc extinguishing device. When the disconnector is operated under load, if the voltage between the contacts is high enough and the current is large enough, an arc may be generated. The long-term existence of the arc may also cause the burning or even explosion of electrical equipment, posing a threat to the safe operation of the power system; and after disconnecting the disconnector, the neutral point of the transformer needs to be grounded and the grounding switch needs to be closed. If this process is omitted, it will cause significant economic losses. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of arc caused by moving contacts when the circuit is broken. Since the neutral point disconnector does not have an arc extinguishing device, when the disconnector is operated under load, if the voltage between the contacts is high enough and the current is large enough, an arc may be generated. The long-term existence of the arc may also cause the burning or even explosion of electrical equipment, posing a threat to the safe operation of the power system. After the disconnector is disconnected, the neutral point of the transformer needs to be grounded and the grounding switch needs to be closed. If this process is omitted, it will cause significant economic losses. A transformer neutral point disconnector is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A transformer neutral point isolating switch comprises a supporting column and also comprises: A fixed channel steel is arranged on the top of the supporting column, and an insulator is also arranged on one side of the top of the fixed channel steel, a bearing seat is connected to one side of the bottom of the insulator, and a roller bearing is connected to the top of the bearing seat; A conductive structure is arranged on the top of the insulator, wherein the conductive structure includes a connecting steel plate rotatably connected to the top of the insulator, a moving contact installed on the outside of the connecting steel plate, a contact piece installed on the inside of the moving contact, a stationary contact sleeved on the outside of the moving contact and threadedly connected to the adjacent connecting steel plate, a grounding switch installed between the moving contact and the connecting steel plate, a grounding rod sliding inside the grounding switch, a rotating plate installed at the bottom of the grounding rod, and a transmission assembly arranged at one end of the rotating plate; An adjusting structure, arranged on one side of the roller bearing, for closing or opening the moving contact and the stationary contact; An outward expansion bracket is arranged on one side of the adjustment structure, a hinged ear plate is arranged on one side of the bottom of the outward expansion bracket, a guide slide bar is sleeved on one side of the central axis of the hinged ear plate, a limit frame is arranged on the outer side of the guide slide bar, and the limit frame is installed on one side of the bottom of the fixed channel steel; The arc extinguishing structure is arranged on the outside of the moving contact and is used for longitudinal arc blowing after the moving contact and the static contact are separated; The stepper motor is arranged at one side of the bottom of the transmission assembly, and a support plate is arranged on the top of the stepper motor. The support plate is installed on the inner side of the fixed channel steel, and the support plate is connected to the bottom of the transmission assembly.

[0007] As a preferred technical solution of the present application, the transmission assembly includes a linear shaft fixed on one side of a rotating plate, a positioning frame installed at one end of the linear shaft and connected to the inner side of a fixed channel steel, an eccentric gear installed on the outside of the linear shaft, a main gear installed on the outer tooth side of the eccentric gear, a transmission shaft installed at the bottom of the main gear, a rotating table sleeved on the outside of the transmission shaft, a lifting support installed on one side of the bottom of the rotating table, and a sealing cover installed on one side of the top of the lifting support.

[0008] As the preferred technical solution of the present application, the adjustment structure includes transverse brackets fixed on both sides of the rotating table, a hinge joint 1 installed on the outside of the transverse bracket, a transmission connecting rod installed on the outside of the central axis of the hinge joint 1, a hinge joint 2 installed on the outside of the transmission connecting rod, and a U-shaped bracket installed on the outside of the hinge joint 2 and fixed to the outside of the roller bearing.

[0009] As a preferred technical solution of the present application, the arc extinguishing structure includes an arc extinguishing hood fixed on the outside of the moving contact, an air blowing pipe installed on one side of the arc extinguishing hood, a telescopic hose installed on one side of the air blowing pipe, an air intake bend installed on the outside of the telescopic hose, a fixing frame installed on one side of the air intake bend and connected to the limit frame, and an arc-shaped binding plate installed on one side of the fixing frame and sliding on the outside of the telescopic hose.

[0010] As a preferred technical solution of the present application, the rotating plate forms a rotating structure through the linear shaft and the grounding rod.

[0011] As a preferred technical solution of the present application, the connecting steel plate forms a rotating structure with the moving contact and the static contact through a roller bearing.

[0012] As a preferred technical solution of the present application, the limiting frame and the bottom side of the guide slide rod are embedded structures, and the guide slide rod forms a sliding structure between the hinged ear plate and the outward expansion bracket.

[0013] As a preferred technical solution of the present application, the eccentric gears are distributed at equal intervals on the vertical center line of the linear shaft, and two adjacent air blow pipes are vertically distributed on the side of the arc extinguishing cover close to the static contact, and the air blow pipe forms a telescopic structure through the telescopic hose and the air inlet bend pipe.

[0014] As a preferred technical solution of the present application, the sealing covers are distributed at equal intervals on the top of the main gear, and the sealing covers are sleeved on the top of the main gear and do not interfere with the moving path of the transmission connecting rod.

[0015] Compared with the prior art, the present invention provides a transformer neutral point isolating switch, which has the following beneficial effects: 1. The transformer neutral point isolating switch cleverly forms a rotating structure between the connecting steel plate through the bearing seat and the moving contact and the static contact, ensuring the stability and flexibility of the rotation. When the main gear is driven, it can effectively transmit the rotational motion to the rotating table installed on it. After receiving the rotational power of the main gear, the rotating table can quickly and forcefully pull the moving contact through a specific transmission connection mechanism to achieve rapid mechanical separation from the static contact. This process not only moves quickly, but also has a precise separation effect, ensuring rapid disconnection and safe isolation of the neutral point; 2. When the moving contact and the static contact of the transformer neutral point disconnector are separated, the linear axis not only drives the above-mentioned separation action, but also cleverly links an additional mechanism: it drives the rotating plate and the grounding rod connected to it to rotate inward. This rotation action ensures that the grounding rod can move accurately to the position of the grounding switch and fit tightly with the grounding switch under the action of mechanical force, without the need for additional operating steps or time delays, greatly improving the safety and efficiency of electrical operations; 3. The neutral point isolating switch of the transformer, the close fit between the grounding rod and the grounding switch, forms a low-impedance conductive path, effectively conducting the residual charge in the power system into the earth, preventing the floating potential or arc discharge caused by the disconnection of the equipment, and providing a safer working environment for the operation and maintenance personnel; 4. When the moving contact and the static contact of the neutral point disconnector of the transformer are separated, high-pressure compressed air is introduced into the air inlet elbow. With the strong blowing of compressed air, the arc is physically elongated by the airflow. As the deionization effect of the arc continues to increase, it can no longer continue to exist and is completely extinguished in a very short time. This process not only protects the contacts from arc erosion, but also significantly improves the life and reliability of the disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a transformer neutral point isolating switch proposed by the present invention; Figure 2 A distribution diagram of a limit plate and an external expansion bracket of a transformer neutral point isolating switch proposed by the present invention; Figure 3 This is a diagram showing the closing effect of a moving contact and a stationary contact of a transformer neutral point isolating switch proposed by the present invention; Figure 4 A schematic diagram of a transformer neutral point isolation arc extinguishing structure proposed by the present invention; Figure 5 A connection diagram of a grounding rod and abutment switch of a transformer neutral point isolating switch proposed by the present invention; Figure 6 A schematic diagram of the structure of a transformer neutral point isolating switch grounding switch proposed by the present invention; Figure 7 A schematic diagram of the structure of a transformer neutral point isolating switch transmission assembly proposed by the present invention; Figure 8 A transformer neutral point isolating switch proposed by the present invention Figure 2 The structural diagram of part A in the figure; Fig. 9 A transformer neutral point isolating switch proposed by the present invention Figure 4 Schematic diagram of the structure of part B.

[0017] In the figure: 1. Support column; 2. Fixed channel steel; 21. Insulator; 22. Bearing seat; 23. Roller bearing; 3. Conductive structure; 301. Connecting steel plate; 302. Moving contact; 303. Contact piece; 304. Static contact; 305. Earthing switch; 306. Earthing rod; 307. Rotating plate; 308. Linear axis; 309. Positioning frame; 3011. Heterochromatic gear; 3012. Main gear; 3013. Transmission shaft; 3014. Rotating table; 3015 , lifting support; 3016, sealing cover; 4, adjustment structure; 41, horizontal bracket; 42, hinged head 1; 43, transmission connecting rod; 44, hinged head 2; 45, U-shaped bracket; 5, outward expansion bracket; 51, hinged ear plate; 52, guide slide bar; 53, limit frame; 6, arc extinguishing structure; 61, arc extinguishing cover; 62, air blowing pipe; 63, telescopic hose; 64, air intake elbow; 65, fixing frame; 66, arc-shaped binding sheet; 7, stepping motor; 71, support plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention. Example

[0019] like Figures 1 to 9 As shown, a transformer neutral point disconnector includes a support column 1 and also includes: The fixed channel steel 2 is arranged on the top of the supporting column 1, and an insulator 21 is also arranged on one side of the top of the fixed channel steel 2, a bearing seat 22 is connected to one side of the bottom of the insulator 21, a roller bearing 23 is connected to the top of the bearing seat 22, and the roller bearing 23 is rotatably connected to the insulator 21; the fixed channel steel 2 is connected to the bearing seat 22 through the supporting column 1, and the fixed channel steel 2 is connected to the bearing seat 22 so that the roller bearing 23 can rotate freely on the bearing seat 22; The conductive structure 3 is arranged on the top of the insulator 21, wherein the conductive structure 3 includes a connecting steel plate 301 rotatably connected to the top of the insulator 21, a moving contact 302 installed on the outside of the connecting steel plate 301, a contact piece 303 installed on the inside of the moving contact 302, a stationary contact 304 sleeved on the outside of the moving contact 302 and threadedly connected to the adjacent connecting steel plate 301, a grounding switch 305 installed between the moving contact 302 and the connecting steel plate 301, a grounding rod 306 sliding inside the grounding switch 305, a rotating plate 307 installed at the bottom of the grounding rod 306, and a transmission assembly arranged at one end of the rotating plate 307; when the moving contact 302 and the stationary contact 304 driven by the connecting steel plate 301 are separated, the rotating plate 307 can drive the grounding rod 306 to synchronously contact the grounding switch 305; The adjustment structure 4 is arranged on one side of the roller bearing 23, and is used to close or disconnect the moving contact 302 and the stationary contact 304; so as to facilitate the flexible switching of the moving contact 302 and the stationary contact 304; The outward expansion bracket 5 is arranged on one side of the adjustment structure 4, and a hinged ear plate 51 is arranged on one side of the bottom of the outward expansion bracket 5. A guide slide bar 52 is sleeved on one side of the central axis of the hinged ear plate 51. A limit frame 53 is arranged on the outer side of the guide slide bar 52, and the limit frame 53 is installed on one side of the bottom of the fixed channel steel 2; the guide slide bar 52 always moves inside the limit frame 53, so as to facilitate the synchronous switching of three groups of symmetrical moving contacts 302 and static contacts 304.

[0020] The arc extinguishing structure 6 is arranged on the outer side of the moving contact 302 and is used for longitudinally blowing the arc after the moving contact 302 and the stationary contact 304 are separated, so that the compressed air can be blown vertically to the moving contact 302 and the stationary contact 304 .

[0021] The stepper motor 7 is arranged at one side of the bottom of the transmission assembly, and a support plate 71 is arranged at the top of the stepper motor 7. The support plate 71 is installed on the inner side of the fixed channel steel 2, and the support plate 71 is connected to the bottom of the transmission assembly. The stepper motor 7 can directly drive the single-side main gear 3012 to facilitate the synchronous on and off of the moving contact 302 and the static contact 304 above the fixed channel steel 2; like Figure 7As shown, in one embodiment: the transmission assembly includes a linear shaft 308 fixed to one side of the rotating plate 307, a positioning frame 309 installed at one end of the linear shaft 308 and connected to the inner side of the fixed channel steel 2, an eccentric gear 3011 installed on the outer side of the linear shaft 308, a main gear 3012 installed on the outer tooth side of the eccentric gear 3011, a transmission shaft 3013 installed at the bottom of the main gear 3012, a rotating table 3014 sleeved on the outer side of the transmission shaft 3013, and a rotating table 3014 installed on the rotating table 3014. The lifting support 3015 is on the bottom side, and the sealing cover 3016 is installed on the top side of the lifting support 3015, wherein the rotating table 3014 is rotatably connected to the lifting support 3015, the lifting support 3015 is fixedly connected to the support plate 71, the output shaft of the stepper motor 7 passes through the support plate 71 and the lifting support 3015 and is fixedly connected to the transmission shaft 3013, the main gear 3012 and the eccentric gear 3011 are both in the sealing cover 3016 to prevent rust, so as to facilitate daily maintenance by the staff.

[0022] like Figure 7 As shown, in one embodiment: the adjustment structure 4 includes a transverse bracket 41 fixed on both sides of the rotating table 3014, a hinge head 42 installed on the outside of the transverse bracket 41, a transmission link 43 installed on the outside of the central axis of the hinge head 42, a hinge head 44 installed on the outside of the transmission link 43, and a U-shaped bracket 45 installed on the outside of the hinge head 44 and fixed to the outside of the roller bearing 23. The two transmission links 43 are pulled inward and outward through the rotating table 3014 to control the rotation of the bearing seat 22, so that a group of connecting steel plates 301 on the opposite side can rotate away from or towards each other and control the connection and disconnection of the moving contact 302 and the static contact 304.

[0023] like Fig. 9 and Figure 4 As shown, in one embodiment: the arc extinguishing structure 6 includes an arc extinguishing cover 61 fixed on the outside of the moving contact 302, an air blowing pipe 62 installed on one side of the arc extinguishing cover 61, a telescopic hose 63 installed on one side of the air blowing pipe 62, an air inlet elbow 64 installed on the outside of the telescopic hose 63, a fixing frame 65 installed on one side of the air inlet elbow 64 and connected to the limit frame 53, and an arc-shaped binding piece 66 installed on one side of the fixing frame 65 and sliding on the outside of the telescopic hose 63. Through the telescopic structure of the telescopic hose 63, the moving contact 302 can achieve a synchronous displacement compensation effect when moving.

[0024] like Figure 5 and Figure 6As shown, in one embodiment: the rotating plate 307 forms a rotating structure with the grounding rod 306 through the linear shaft 308, and the bottom of the grounding rod 306 is slidably connected to the fixed channel steel 2, which will not affect the rotation of the grounding rod 306. The rotating plates 307 are connected by the linear shaft 308 to facilitate the synchronous rotation of the three groups of rotating plates 307, and ensure that the three groups of parallel grounding rods 306 always maintain the same direction.

[0025] like Figure 2 and Figure 5 As shown, in one embodiment: the connecting steel plate 301 forms a rotating structure with the moving contact 302 and the stationary contact 304 through the roller bearing 23.

[0026] like Figure 2 and Figure 8 As shown, in one embodiment: the limit frame 53 and the bottom side of the guide slide bar 52 are embedded in a structure, and the guide slide bar 52 forms a sliding structure with the outward expansion bracket 5 through the hinged ear plate 51. The guide slide bar 52 always pushes the outward expansion bracket 5 inside the limit frame 53 to prevent the surface of the guide slide bar 52 from rusting.

[0027] like Figure 3 and Figure 7 As shown, in one embodiment: the eccentric gears 3011 are evenly spaced on the vertical center line of the linear shaft 308, and the adjacent eccentric gears 3011 are meshedly connected with the main gear 3012, and the three groups of eccentric gears 3011 are used to jointly complete the flexible switching of the three groups of grounding rods 306 and the three groups of grounding switches 305.

[0028] like Figure 4 and Fig. 9 As shown, in one embodiment: the air blowing pipe 62 is vertically distributed on one side of the arc extinguishing cover 61 close to the static contact 304 , and the air blowing pipe 62 forms a telescopic structure with the air inlet elbow 64 through the telescopic hose 63 .

[0029] like Figure 1 and Figure 3 As shown, in one embodiment: the sealing covers 3016 are evenly spaced on the top of the support plate 71, the sealing covers 3016 are sleeved on the top of the main gear 3012 and do not interfere with the moving path of the transmission connecting rod 43, and a groove larger than the thickness of the transmission connecting rod 43 is provided at the bottom of the sealing cover 3016 to allow the transmission connecting rod 43 to slide flexibly and avoid getting stuck.

[0030] Specifically, when a neutral point isolating switch of a transformer is in use: the supporting column 1 is placed on the ground, and the compressed air pipeline is connected to the air intake elbow 64. When the isolating switch is started, the control button of the high-voltage frequency conversion cabinet can be pressed to start the stepper motor 7 at the bottom of the support plate 71, and the motor shaft drives the transmission shaft 3013 to rotate, and the transmission shaft 3013 drives the main gear 3012 and the rotating table 3014 sleeved on the outside to rotate. During this process, the rotating table 3014 can be started to pull the outer horizontal bracket 41, and the horizontal bracket 41 pulls the transmission connecting rod 43 through the outer hinge head 1 42, and the transmission connecting rod 43 pulls the hinge head 2 44 inward along the hinge, and the hinge head 2 44 drives the outer U-shaped bracket 45 to rotate in the direction of the rotating table 3014, and the U The shaped bracket 45 drives the roller bearing 23 and the bearing seat 22 below to rotate, and the bearing seat 22 drives the insulator 21 and the connecting steel plate 301 above to rotate. The connecting steel plate 301 expands the moving contact 302 outward, so that the moving contact 302 is separated from the static contact 304. At this time, compressed air is introduced into the air inlet elbow 64, and the compressed air enters the blowing pipe 62 through the telescopic hose 63, and blows vertically and longitudinally on the surface of the contact piece 303 of the moving contact 302 and the static contact 304 through the outer side of the arc extinguishing cover 61. With the strong blowing of compressed air, the arc between the contact piece 303 of the moving contact 302 and the static contact 304 is rapidly cooled, and its temperature drops sharply, resulting in a slowdown in the ionization process inside the arc and a reduction in the number of free electrons and ions. At the same time, the effect of the airflow also physically lengthens the arc, further increasing the resistance of the arc, reducing the arc current and improving stability. This dual effect of cooling and stretching creates a strong deionization effect, that is, the charged particles in the arc are quickly dispersed and can no longer maintain a continuous discharge channel. Eventually, as the deionization effect of the arc continues to increase, it can no longer continue to exist and is completely extinguished in a very short time.

[0031] While the moving contact 302 and the stationary contact 304 are separated, the main gear 3012 can drive the eccentric gear 3011 above the lifting support 3015, and the eccentric gear 3011 drives the linear shaft 308 to rotate, and the linear shaft 308 drives the rotating plate 307 and the grounding rod 306 connected thereto to rotate inward together. This rotation action ensures that the grounding rod 306 can accurately move to the position of the grounding switch 305 and fit tightly with the grounding switch 305 under the action of mechanical force. This design allows the grounding process to proceed synchronously with the separation action of the contacts. The close fit of the grounding rod 306 and the grounding switch 305 forms a low-impedance conductive path, which effectively conducts the residual charge in the power system into the earth, and prevents the floating potential or arc discharge caused by the disconnection of the equipment.

[0032] In addition, when a group of moving contacts 302 separates from the stationary contact 304, the outward expansion bracket 5 outside the roller bearing 23 can not only rotate outward synchronously, but the bottom extension part of the outward expansion bracket 5 can also cleverly penetrate into the inner side of the limit frame 53. This structure ensures the accuracy and stability of the action. Inside the limit frame 53, the extension part pushes the guide slide 52 outward along the central axis of the hinged ear plate 51. This driving force is effectively transmitted, so that the guide slide 52 can synchronously and smoothly push the outward expansion bracket 5 on the other side, so that the three groups of outward expansion brackets 5 form a tight interlocking connection. They cooperate with each other to ensure that when one group of moving contacts 302 begins to separate from the stationary contact 304, the other two groups of moving contacts 302 can also perform the separation operation synchronously. This synchronization not only improves the operating efficiency of the equipment, but also greatly enhances its reliability and safety.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A transformer neutral point disconnector, comprising a support column (1), characterized in that: Also includes: A fixed channel steel (2) is arranged on the top of the supporting column (1), and an insulator (21) is also arranged on one side of the top of the fixed channel steel (2), a bearing seat (22) is connected to one side of the bottom of the insulator (21), and a roller bearing (23) is connected to the top of the bearing seat (22); A conductive structure (3) is arranged on the top of the insulator (21), wherein the conductive structure (3) comprises a connecting steel plate (301) rotatably connected to the top of the insulator (21), a moving contact (302) installed on the outside of the connecting steel plate (301), a contact piece (303) installed on the inside of the moving contact (302), a stationary contact (304) sleeved on the outside of the moving contact (302) and threadedly connected to the adjacent connecting steel plate (301), an earthing switch (305) installed between the moving contact (302) and the connecting steel plate (301), an earthing rod (306) sliding inside the earthing switch (305), a rotating plate (307) installed at the bottom of the earthing rod (306), and a transmission assembly arranged at one end of the rotating plate (307); An adjustment structure (4) is arranged on one side of the roller bearing (23) and is used to close or open the moving contact (302) and the stationary contact (304); An outward expansion bracket (5) is arranged on one side of the adjustment structure (4); The arc extinguishing structure (6) is arranged on the outside of the moving contact (302) and is used for longitudinally blowing the arc after the moving contact (302) and the stationary contact (304) are separated.

2. A transformer neutral point isolating switch according to claim 1, characterized in that: The transmission assembly comprises a linear shaft (308) fixed to one side of a rotating plate (307), a positioning frame (309) installed at one end of the linear shaft (308) and connected to the inner side of a fixed channel steel (2), an eccentric gear (3011) installed on the outer side of the linear shaft (3010), a main gear (3012) installed on the outer teeth side of the eccentric gear (3011), a transmission shaft (3013) installed at the bottom of the main gear (3012), a rotating platform (3014) sleeved on the outer side of the transmission shaft (3013), a lifting support (3015) installed on one side of the bottom of the rotating platform (3014), and a sealing cover (3016) installed on one side of the top of the lifting support (3015).

3. A transformer neutral point isolating switch according to claim 2, characterized in that: The adjustment structure (4) comprises a transverse support (41) fixed on both sides of the rotating platform (3014), a hinge head (42) installed on the outside of the transverse support (41), a transmission connecting rod (43) installed on the outside of the central axis of the hinge head (42), a hinge head (44) installed on the outside of the transmission connecting rod (43), and a U-shaped support (45) installed on the outside of the hinge head (44) and fixed to the outside of the roller bearing (23).

4. A transformer neutral point isolating switch according to claim 3, characterized in that: The arc extinguishing structure (6) comprises an arc extinguishing cover (61) fixed on the outside of the moving contact (302), an air blowing pipe (62) installed on one side of the arc extinguishing cover (61), a telescopic hose (63) installed on one side of the air blowing pipe (62), an air intake elbow (64) installed on the outside of the telescopic hose (63), a fixing frame (65) installed on one side of the air intake elbow (64) and connected to the limit frame (53), and an arc-shaped binding sheet (66) installed on one side of the fixing frame (65) and sliding on the outside of the telescopic hose (63).

5. A transformer neutral point isolating switch according to claim 4, characterized in that: A stepper motor (7) is arranged at one side of the bottom of the transmission assembly, and a support plate (71) is arranged on the top of the stepper motor (7), the support plate (71) is installed on the inner side of the fixed channel steel (2), and the support plate (71) is connected to the bottom of the transmission assembly.

6. A transformer neutral point isolating switch according to claim 2, characterized in that: The rotating plate (307) forms a rotating structure with the grounding rod (306) via a linear shaft, and the connecting steel plate (301) forms a rotating structure with the moving contact (302) and the stationary contact (304) via a roller bearing (23).

7. A transformer neutral point isolating switch according to claim 1, characterized in that: A hinged ear plate (51) is provided on one side of the bottom of the outward expansion bracket (5), a guide slide bar (52) is sleeved on one side of the central axis of the hinged ear plate (51), a limit frame (53) is provided on the outer side of the guide slide bar (52), the limit frame (53) is installed on one side of the bottom of the fixed channel steel (2), the limit frame (53) and the bottom side of the guide slide bar (52) are embedded in each other, and the guide slide bar (52) forms a sliding structure through the hinged ear plate (51) and the outward expansion bracket (5).

8. The transformer neutral point isolating switch according to claim 3, characterized in that: The eccentric gears (3011) are distributed at equal intervals on the vertical center line of the linear shaft (308), and two adjacent groups of the eccentric gears (3011) are meshedly connected with the main gear (3012).

9. A transformer neutral point isolating switch according to claim 4, characterized in that: The air blowing pipe (62) is vertically distributed on a side of the arc extinguishing cover (61) close to the static contact, and the air blowing pipe (62) forms a telescopic structure with the air inlet elbow (64) through a telescopic hose (63).

10. A transformer neutral point isolating switch according to claim 3, characterized in that: The sealing covers (3016) are distributed at equal intervals on the top of the main gear (3012); the sealing covers (3016) are sleeved on the top of the main gear (3012) and do not interfere with the moving path of the transmission connecting rod (43).

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