Vacuum arc-extinguishing chamber device of three-phase common-box high-voltage environment-friendly GIS (Gas Insulated Switchgear) and voltage-sharing capacitor angle adjusting method thereof

Abstract

The invention provides a vacuum arc-extinguishing chamber device of a three-phase common-box high-voltage environment-friendly GIS (Gas Insulated Switchgear) and a voltage-sharing capacitance angle adjusting method of the vacuum arc-extinguishing chamber device. The device comprises a GIS tank body and three vacuum arc-extinguishing chambers arranged in the GIS tank body, a main rotating shaft is sleeved outside a movable end cover of each vacuum arc-extinguishing chamber, a subordinate rotating shaft is arranged outside a static end cover, and the main rotating shaft and the subordinate rotating shaft are connected through a connecting rod; the connecting rod is connected in series with a voltage-sharing capacitor, and two ends of the voltage-sharing capacitor are provided with voltage-sharing rings; an electric field intensity sensor is arranged at the joint of the connecting rod and the main rotating shaft; an annular driving unit is further arranged at the end part of the outer side of the movable end cover; the annular driving unit drives the main rotating shaft to rotate and drives the slave rotating shaft to rotate; a control unit is further arranged in the GIS tank body and used for receiving field intensity data sensed by the electric field intensity sensor and controlling the annular driving unit to rotate. The adjusting method comprises the following steps: the annular driving unit controls the rotating shaft and drives the voltage-sharing capacitor to rotate, so that the electric field intensity distribution of each phase of vacuum arc-extinguishing chamber is optimal, and electric field voltage sharing and insulation performance optimization are realized.

Description

Technical Field

[0001] This invention relates to the field of vacuum interrupter technology, and in particular to a vacuum interrupter device for a three-phase common-box high-voltage environmentally friendly GIS and a method for adjusting the angle of its equalizing capacitor. Background Technology

[0002] The global power industry is facing severe environmental pressures. SF6 gas, as an excellent insulating and arc-quenching medium in traditional high-voltage switchgear, has a global warming potential (GWP) more than 23,500 times that of CO2 and an atmospheric lifetime of up to 3,200 years. The international community and many countries have introduced policies to restrict or phase out the use of sulfur hexafluoride (SF6). Against this backdrop, "fluorine-free" technology has become an inevitable trend in the development of high-voltage switchgear, with the technical route of using vacuum interrupters supplemented by environmentally friendly gases such as dry air and nitrogen for insulation showing great promise.

[0003] In the prior art, in the invention entitled "A High-Voltage Vacuum Interruptor Internal Voltage Equalizing Shield Structure" (publication number CN 120637149 A), the influence of the internal voltage equalizing shield's capacitance to ground on the potential bias is reduced to minimize the voltage concentration phenomenon that occurs when the vacuum interruptor is applied to a circuit breaker. Compared with single-phase interruptors, three-phase interruptors can guarantee higher voltage levels. However, in high-voltage, fluorine-free, environmentally friendly three-phase common-enclosure GIS, integrating vacuum interruptors in parallel within the same gas chamber faces two challenges: First, the relatively low insulation strength of environmentally friendly gases amplifies the problems of insufficient voltage equalization between breaks and decreased phase-to-phase insulation strength within the limited enclosure space, severely restricting the promotion of this technology to higher voltage levels. Second, to optimize the electric field distribution of the three-phase vacuum interruptor, the positions of each phase need to be repeatedly adjusted to find the optimal angle that minimizes the maximum electric field strength, thereby improving the breaking capacity. However, how the external capacitor rotates outside the vacuum interruptor becomes a major obstacle. Therefore, this invention proposes a vacuum interrupter device for a three-phase common-box high-voltage environmentally friendly GIS and a method for adjusting the angle of its equalizing capacitor. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a vacuum interrupter device for a three-phase common-enclosure high-voltage environmentally friendly GIS and a method for adjusting the angle of its equalizing capacitor.

[0005] To achieve the above objectives, the first aspect of the present invention provides a vacuum interrupter device for a three-phase common-box high-voltage environmental protection GIS, comprising: a GIS tank and three vacuum interrupters installed inside the GIS tank, each vacuum interrupter corresponding to one phase of the power system; Each vacuum interrupter has a main rotating shaft fitted over the moving end cover and a subordinate rotating shaft fitted over the stationary end cover. The main rotating shaft and the subordinate rotating shaft are connected by a connecting rod. A voltage equalizing capacitor is connected in series on the connecting rod, and voltage equalizing rings are provided at both ends of the voltage equalizing capacitor. An electric field strength sensor is provided at the connection between the connecting rod and the main rotating shaft; An annular drive unit is also provided at the outer end of the moving end cap. The annular drive unit is placed inside the outer shield of the moving end of each vacuum interrupter. The annular drive unit drives the main rotating shaft to rotate, thereby driving the subordinate rotating shaft to rotate. The GIS tank is also equipped with a control unit, which is used to receive the field strength data sensed by the electric field strength sensor, and control the ring drive unit corresponding to each vacuum interrupter to work according to the field strength data, so as to drive the main rotating shaft to rotate and drive the equalizing capacitor to rotate.

[0006] The above solution, by arranging the three-phase arc-extinguishing chambers in a common enclosure and connecting the voltage-equalizing capacitors in series on the connecting rods, not only ensures reliable voltage equalization and sufficient interphase insulation strength between the breaks within the compact enclosure space, but also makes it possible for this technology to break through voltage level limitations and be applied on a large scale in higher voltage fields; it also solves the problem of coordinated rotation between the external voltage-equalizing capacitors and the arc-extinguishing chamber body.

[0007] In one possible embodiment, the ceramic shell and the outer side of the main shield of the vacuum interrupter are provided with multiple subordinate rotating shafts, each subordinate rotating shaft is provided with a support member, and the support member is connected to the connecting rod to drive the connecting rod to rotate smoothly.

[0008] Because the connecting rod is prone to bending, torsional vibration or swaying when rotating due to its own weight, eccentric load or uneven drive, resulting in unstable rotation and inaccurate positioning, multiple subordinate rotating shafts and their supporting components are set to provide multiple rotation fulcrums for the connecting rod, so as to drive the connecting rod to rotate smoothly.

[0009] In one possible embodiment, the connecting rod is composed of multiple connecting rod segments, and four columnar equalizing capacitors are connected in series on the connecting rod. Each columnar equalizing capacitor has a connecting terminal at both ends, and the connecting terminal is connected to the connecting rod segment. An equalizing ring is provided at the connection between the connecting rod segment and the connecting terminal.

[0010] The above-described scheme utilizes four series-connected capacitors to achieve precise graded voltage equalization of the axial potential of the arc-extinguishing chamber, while the fixed radial coupling distance creates a stable external compensation electric field. This dual effect minimizes electric field distortion and significantly improves insulation reliability. Localized problems in a single connecting rod or capacitor unit typically do not lead to catastrophic overall failure, resulting in better mechanical redundancy.

[0011] The second aspect of this invention provides a method for adjusting the angle of the equalizing capacitor in a vacuum interrupter device of a three-phase common-enclosure high-voltage environmental GIS, implemented according to the device described in the first aspect of this invention. The control unit receives field strength data sensed by the electric field strength sensor and controls the corresponding annular drive unit of each vacuum interrupter to operate based on the field strength data, thereby driving the main rotating shaft to rotate and causing the equalizing capacitor to rotate to the angle where the electric field strength sensor senses the minimum value. The steps include: The main rotating shafts of the three vacuum interrupters are controlled to rotate at preset angle intervals within a set angle range, and the electric field intensity of each phase is recorded at each interval angle to form a corresponding electric field intensity data set. The set angle range is from 0 to 180 degrees. From all electric field intensity data sets, find the global minimum electric field intensity value as the first target value, and filter out all electric field intensity data sets that contain the first target value; In the data groups retained after the first round of screening, the second smallest global field strength value is searched as the second target value, and data groups containing the second target value are selected. In the data set retained after the second round of screening, the third smallest global field strength value is selected as the third target value; By mapping the first target value, the second target value, and the third target value to the corresponding three phases, the combination of three-phase rotation angles that minimizes the overall electric field strength can be determined. The ring drive unit corresponding to each vacuum interrupter is controlled by the three-phase rotation angle group to drive the main rotating shaft to rotate, thereby driving the equalizing capacitor to rotate to the corresponding rotation angle.

[0012] The above method finds the point where the maximum electric field strength inside the vacuum interrupter is minimized. The point where the electric field strength is minimized has the highest degree of symmetry, which means that the peak value of the electric field is effectively suppressed, the electric stress on the insulating medium is significantly reduced, and thus the aging of the insulation is delayed. The symmetrical and uniform electric field can stabilize the shape and movement path of the arc, making the arc easier to extinguish when it crosses zero, and improving the breaking success rate.

[0013] By optimizing the electric field inside the vacuum interrupter, the insulation strength and arc-extinguishing efficiency are essentially improved at the source; this not only enhances the performance and lifespan of the equipment itself, but also improves the reliability and safety of circuit breaker operation in the power system.

[0014] In one possible embodiment, if the multisets of the first target value, the second target value, and the third target value in the multiple sets of electric field intensity data are equal, the control unit selects the combination arranged in the first preset order as the optimal rotation angle combination.

[0015] The above scheme ensures the uniqueness and reproducibility of the optimal angle selection, enabling the system to quickly reset to the initial electric field position with minimal offset after adjustment, thus reducing operational complexity and the risk of accumulated errors.

[0016] In one possible embodiment, at the initial position, the centers of each vacuum interrupter and the corresponding equalizing capacitor are all on the same circumference centered on the center of the tank. The control unit rotates the equalizing capacitors corresponding to each interrupter phase by phase or simultaneously in a clockwise direction.

[0017] In the above scheme, the arc-extinguishing chamber and the capacitor are located on the same circumference, which can ensure high symmetry of the electric field of each phase, which is conducive to suppressing partial discharge and improving the overall insulation strength; the same distance and symmetrical arrangement reduce interphase interference, making the electric field consistency of the multiphase system better; the circumferential layout makes full use of the internal space of the tank, which is conducive to the compact design of the equipment. Phase-by-phase rotation is suitable for scenarios requiring sequential adjustment or avoiding simultaneous impact; simultaneous rotation is suitable for rapid overall adjustment, with all phases adjusted synchronously and a fast response speed. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a single-phase arc-extinguishing chamber structure provided in an embodiment of the present invention; Figure 2 This is a front view of the single-phase arc-extinguishing chamber structure provided in an embodiment of the present invention; Figure 3 This is a top view of the three-phase arc-extinguishing chamber structure provided in an embodiment of the present invention; Figure 4 The voltage distribution equivalent circuit diagram provided in the embodiment of the present invention; Figure 5 This is a comparison diagram of the potential distribution effects of the present invention between a traditional unidirectional 126kV and a three-phase common-enclosure 126kV. Figure 6 This is a comparison diagram of the maximum external electric field intensity when a 126kV excitation is applied at different angles according to the present invention. Figure 7 This is a vector diagram of the main view of the single-phase arc-extinguishing chamber structure provided in an embodiment of the present invention.

[0019] In the diagram, 1-moving end support; 2-moving end guide rod; 3-ring drive unit; 4-moving end cover; 5-electric field strength sensor; 6-equalizing ring; 7-equalizing capacitor; 8-connecting rod; 9-support component; 10-stationary end guide rod; 11-stationary end cover; 12-stationary end support; 13-bottom support; 14-moving end outer shield; 15-bellows; 16-moving end shield; 17-moving side suspension shield; 18-main shield; 19-moving contact; 20-stationary contact; 21-stationary side suspension shield; 22-stationary end shield; 23-stationary end outer shield; 24-main rotating shaft; 25-subordinate rotating shaft; 26-ceramic shell. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below through specific embodiments. Example 1

[0021] The first aspect of this invention provides a vacuum interrupter device for a three-phase common-enclosure high-voltage environmentally friendly GIS, with reference to... Figure 1 , Figure 2 and Figure 7 It includes: a GIS tank and three vacuum interrupters installed inside the GIS tank, each vacuum interrupter corresponding to one phase of the power system; Each vacuum interrupter has a main rotating shaft 24 fitted over the moving end cover 4 and a subordinate rotating shaft 25 fitted over the stationary end cover 11. The main rotating shaft 24 and the subordinate rotating shaft 25 are connected by a connecting rod 8. A voltage equalizing capacitor 7 is connected in series on the connecting rod 8, and voltage equalizing rings 6 are provided at both ends of the voltage equalizing capacitor 7. An electric field strength sensor 5 is provided at the connection between the connecting rod 8 and the main rotating shaft 24; The outer end of the moving end cap 4 is also provided with an annular drive unit 3. The annular drive unit 3 is placed inside the outer shield 14 of the moving end of each vacuum interrupter. The annular drive unit 3 drives the main rotating shaft 24 to rotate, thereby driving the subordinate rotating shaft 25 to rotate. The GIS tank is also equipped with a control unit, which is used to receive the field strength data sensed by the electric field strength sensor 5, and control the ring drive unit 3 corresponding to each vacuum interrupter to work according to the field strength data, so as to drive the main rotating shaft 24 to rotate and drive the equalizing capacitor 7 to rotate.

[0022] refer to Figure 1The vacuum interrupter includes a moving end guide rod 2. One end of the moving end guide rod 2 is connected to a moving contact 19. The other end of the moving end guide rod 2 passes sequentially through the annular drive unit 3, the moving end cover 4, the moving end shield 16, the moving side floating shield 17, and the main shield 18, and is fixedly connected to the moving end guide rod 2. The moving end shield 16 is fixed to the center of the moving end cover 4 by welding. The moving end cover 4 is sealed to one end of the bellows 15, and the other end of the bellows 15 is sealed to the moving end guide rod 2. The moving end shield 16 is sleeved on the outside of the bellows 15. The bottom of the annular drive unit 3 is provided with a groove, and the moving end cover 4 is embedded in the groove. The moving end shield 16 is connected to the moving end cover 4 and nested with the moving side floating shield 17. The vacuum interrupter includes a stationary end guide rod 10, one end of which is connected to a stationary contact 20, and the other end of which passes sequentially through a stationary end cover 11, a stationary end shield 22, a stationary side floating shield 21, and a main shield 18; a stationary end support 12 is connected to a stationary end outer shield 23, the top of which has a groove, and the stationary end cover 11 is embedded in the groove; the stationary end shield 22 is connected to the stationary end cover 11 and nested with the stationary side floating shield 21. To seal the vacuum interrupter device, a ceramic shell 26 and a main shield 18 are provided on the outside of the vacuum interrupter. The ceramic shell 26 is connected to the moving end cover 4, the moving side floating shield 17, the main shield 16, the stationary side floating shield 21, the main shield 18 and the stationary end cover 11 by welding. The material between the main shields 16 is metal.

[0023] refer to Figure 3 The three vacuum interrupters are fixed to the bottom of the GIS tank by their respective bottom supports 13.

[0024] The components mentioned in the above solution are the same as those and connection methods mentioned in the prior art. The difference is that this embodiment has the main rotating shaft 24, the subordinate rotating shaft 25, the ring drive unit 3, and the installation method of the ring drive unit 3 driving the connecting rod 8 to rotate.

[0025] It should be noted that the three vacuum interrupters are fixed to the bottom of the GIS tank by their respective bottom supports 13, so the three vacuum interrupters are stationary. The main rotating components are the moving end cover 4, the connecting rod 8, and the electric field strength sensor 5 and the equalizing capacitor 7 on the connecting rod 8.

[0026] Reference Figure 5Under the same 550 kV lightning impulse conditions, the location of the maximum electric field strength in the external space of the arc-extinguishing chamber remains unchanged under different assembly angles of the columnar capacitor. Therefore, the electric field strength sensor 5 is installed at the location where the maximum electric field strength occurs. Since the point with the maximum electric field strength is the most vulnerable and most likely to break down point in the entire insulation system, ensuring the safety of the most dangerous point is equivalent to fundamentally ensuring the insulation safety of the entire device.

[0027] This embodiment uses a three-phase integrated arc-extinguishing chamber. The phase-to-phase shielding makes the electric field more uniform and the voltage threshold higher, enabling it to achieve a higher voltage level and stronger breaking capacity than the traditional distributed arrangement within the same volume.

[0028] In one possible embodiment, the ceramic shell 26 of the vacuum interrupter and the outer side of the main shield 18 are provided with a plurality of subordinate rotating shafts 25, and each subordinate rotating shaft 25 is provided with a support member 9. The support member 9 is connected to the connecting rod 8 to drive the connecting rod 8 to rotate smoothly.

[0029] The connecting rod is composed of multiple connecting rod segments, and four columnar equalizing capacitors are connected in series on the connecting rod. Each columnar equalizing capacitor has a connecting terminal at both ends. The connecting terminal is connected to the connecting rod segment, and the equalizing ring is also provided at the connection between the connecting rod segment and the connecting terminal.

[0030] In this embodiment, the columnar voltage equalizing capacitor 7 is made of ceramic material, and copper voltage equalizing rings 6 are welded to both the upper and lower sides of the voltage equalizing capacitor 7. The ring body of the voltage equalizing ring 6 has threaded grooves; the connecting terminals are also made of copper material, and the two are connected by threads.

[0031] In a preferred embodiment, the vacuum interrupter is 1507mm long, the connecting rod 8 is 829mm long, and includes an equalizing capacitor 7, an equalizing ring 6, and connecting terminals on the connecting rod. The main shield 18 has a radius of 120mm, the ceramic shell has a radius of 111.5mm and a thickness of 5mm, the tank height is 2457mm, and the side thickness is 15mm. Each phase interrupter is connected to the tank bottom via a bottom support, and the tank bottom thickness is 60mm. The three phase interrupters are arranged in a parallel, vertically symmetrical, triangular pattern inside the tank. The projection points of the centers of the three vacuum interrupters on the horizontal plane form an isosceles triangle with a base length of 440mm, a height of 282mm, and its apex pointing towards the center of the tank. The horizontal distance between this apex and the center of the tank is 227mm. The columnar equalizing capacitor 7 is 140mm away from the center of its corresponding vacuum interrupter.

[0032] The isosceles triangle used in the above scheme is a highly symmetrical geometric shape, which balances the voltage borne by the phase insulation and avoids excessive electric field stress on any phase; it reduces the three-phase imbalance, makes the distribution of electric and magnetic fields more symmetrical, and improves the overall insulation reliability of the equipment; within a given tank cross-sectional area, it can accommodate a larger arc-extinguishing chamber diameter or more insulation margin; the internal electric field is easier to conduct and control through the symmetrical shielding structure; the ring array arrangement makes the three-phase common-enclosure GIS more compact in structure, significantly reducing the overall size and floor space of the equipment, and reducing the volume compared to the separate-phase type; it improves the electric field outside the vacuum arc-extinguishing chamber and reduces space occupation.

[0033] In one possible embodiment, the equalizing capacitor 7, the equalizing ring 6, the connecting rod 8, and the support member 9 are arranged along the same vertical line; wherein, the equalizing capacitor 7 uses a high dielectric constant ceramic based on modified barium titanate as the dielectric, the dielectric constant of which is between 4000 and 5000, and its shape is cylindrical with a radius of 25mm to 30mm and a height of 60mm to 80mm.

[0034] In one possible embodiment, the moving contact 19, the stationary contact 20, the moving end cover 4, the stationary end cover 11, the moving end shield 16, the stationary end shield 22, the moving end outer shield 14, the moving end outer shield 23, the moving side floating shield 17, the stationary side floating shield 21, the equalizing ring 6, and the connecting rod 8 of each vacuum interrupter are made of copper; the moving end support 1 and the stationary end support 12 are made of aluminum; the main shield 18 is made of stainless steel; the bottom support 13 is a composite material of high-performance epoxy resin and alkali-free glass fiber; and the main rotating shaft 24 and the subordinate rotating shaft 25 are made of high-carbon chromium bearing steel.

[0035] The four columnar equalizing capacitors 7 provided on the connecting rod 8 are respectively connected in parallel between the moving end shield 16 and the moving side floating shield 17, between the moving side floating shield 17 and the main shield 18, between the main shield 18 and the stationary side floating shield 21, and between the stationary side floating shield 21 and the stationary end outer shield 23. Its equivalent circuit is as follows Figure 4 As shown, C 15 C is the equivalent capacitance between the breaks in phase A. 13 C is the equivalent capacitance of the main shield 18 of phase A and the moving end shield 16. 35 C is the equivalent capacitance of the main shield 18 of phase A and the stationary shield 22. 12 C is the equivalent capacitance of the A-phase moving end shield 16 and the moving side floating shield 21. 23 C is the equivalent capacitance of the dynamic-side floating shield 17 and the main shield 18; 34C is the equivalent capacitance of the main shield 18 of phase A and the static side floating shield 21. 45 C is the equivalent capacitance of phase A stationary side suspended shield 21 and stationary end shield 22; SG3 C SG4 C SG5 Stray capacitances of the main shielding covers for phases A, B, and C, respectively; C AB For the equivalent capacitance between phase B breaks, C AC The equivalent capacitance between the C-phase breaks; C B1 C B5 These are the equivalent capacitances of the B-phase main shield 18 to the B-phase moving contact 19 and the B-phase main shield 18 to the B-phase stationary contact 20, respectively; C C1 C C5 These are the equivalent capacitances of the C-phase main shield 18 to the C-phase moving contact 19 and the C-phase main shield 18 to the C-phase stationary contact 20, respectively.

[0036] It should be noted that the equalizing capacitor 7 effectively reduces the electric field strength and potential difference between the contact breaks by optimizing the voltage distribution between the shields, thereby directly improving the insulation recovery strength and dielectric tolerance between the breaks inside the arc extinguishing chamber.

[0037] Reference Figure 6 Under the same 126 kV excitation, compared with the traditional 126 kV vacuum interrupter, the maximum electric field strength inside the interrupter is 3.78 kV / mm. Due to the influence of the tank and the phase-to-phase effect, the electric field strength inside the traditional 126 kV three-phase common-enclosure GIS vacuum interrupter increases to 4.26 kV / mm, which is 12.70% higher than that of the traditional 126 kV vacuum interrupter. In this embodiment, a columnar ceramic voltage equalizing capacitor is connected in parallel on the basis of the 126 kV three-phase common-enclosure GIS vacuum interrupter, and the electric field strength inside the vacuum interrupter is 3.34 kV / mm, which is 21.60% lower than that of the traditional 126 kV three-phase common-enclosure GIS vacuum interrupter. Example 2

[0038] This embodiment provides a method for adjusting the angle of the equalizing capacitor in a vacuum interrupter device of a three-phase common-box high-voltage environmental protection GIS. It is implemented by the device described in the first aspect of the present invention. The control unit receives the field strength data sensed by the electric field strength sensor 5 and controls the ring drive unit 3 corresponding to each vacuum interrupter to work according to the field strength data, so as to drive the main rotating shaft 24 to rotate and drive the equalizing capacitor 7 to rotate to the angle where the sensed value of the electric field strength sensor 5 is the smallest.

[0039] It should be noted that by finding the angle with the minimum induction value of electric field strength sensor 5, the external insulation capability of the arc-extinguishing chamber can be improved. Electric field strength is the fundamental cause of breakdown of gaseous or solid insulating media. The angle with the minimum induction value means that the electric field strength in that direction is the lowest, and the insulating medium, such as air or SF6 gas, is least likely to break down, thus directly improving the external insulation withstand capability at that location. The external electric field of a vacuum interrupter is usually non-uniform. Finding the minimum induction value is essentially actively seeking a region with a relatively uniform electric field distribution and the mildest field strength. Arranging the opening process of the vacuum interrupter in this region can avoid the most dangerous electric field concentration area.

[0040] The steps of the main rotating shaft 24 driving the equalizing capacitor 7 to rotate to the angle where the electric field strength sensor 5 has the minimum sensing value include: The three-phase vacuum interrupter is controlled to rotate at preset angle intervals within a set angle range, and the electric field intensity of each phase is recorded at each interval angle to form a corresponding electric field intensity data set. The set angle range is from 0 to 180 degrees. It should be noted that during the initial rotation, the initial rotation position is set to 0 degrees. At the initial position, the centers of each vacuum interrupter and the corresponding equalizing capacitor 7 are all on the same circumference centered on the center of the tank. The control unit rotates the equalizing capacitor 7 corresponding to each vacuum interrupter in a clockwise direction, either phase by phase or simultaneously.

[0041] Rotating at preset angle intervals can be understood as rotating once every 30 degrees, within a 180-degree range, rotating at 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees and 180 degrees respectively.

[0042] From all electric field intensity data sets, find the global minimum electric field intensity value as the first target value, and filter out all electric field intensity data sets that contain the first target value; In the data groups retained after the first round of screening, the second smallest global field strength value is searched as the second target value, and data groups containing the second target value are selected. In the data set retained after the second round of screening, the third smallest global field strength value is selected as the third target value; By mapping the first target value, the second target value, and the third target value to the corresponding three phases, the combination of three-phase rotation angles that minimizes the overall electric field strength can be determined. The ring drive unit 3 corresponding to each vacuum interrupter is controlled according to the three-phase rotation angle group to drive the main rotating shaft 24 to rotate, thereby driving the equalizing capacitor 7 to rotate to the corresponding rotation angle.

[0043] In one possible embodiment, if the data set obtained after three screenings is not unique, the control unit 3 selects the combination that is first in the preset order as the optimal rotation angle combination.

[0044] This can be understood as follows: for example, considering that the order of elements in a multiset does not affect the comparison result, such as (A phase: 50, B phase: 65, C phase: 70) and (A phase: 70, B phase: 50, C phase: 65) being considered the same, we will select the angle corresponding to the original order (A phase: 50, B phase: 65, C phase: 70) in the combination with the same numerical distribution as the optimal rotation angle.

[0045] By adopting the above scheme, the uniqueness and reproducibility of the optimal angle selection are ensured, so that the system can always quickly reset to the initial electric field position with the minimum offset after adjustment, reducing the complexity of operation and the risk of cumulative error.

[0046] For example, in the method, the rotation angle range of the three-phase vacuum interrupter (phase A, phase B, and phase C) is set to 0°-180°, and discrete angle sampling is performed within this range in steps of 60°. By collecting and analyzing the electric field intensity data of each phase at the sampling point, the optimal combination of rotation angles of each phase that minimizes the overall electric field intensity of the three phases is determined.

[0047] Step 1: Collect the electric field intensity of the three phases at the set rotation angle. The table below provides eight candidate angle combinations and their corresponding three-phase electric field intensities.

[0048]

[0049] Step Two: Screening Process and Target Value Determination

[0050] Step 3: Final Mapping and Optimal Angle Combination

[0051] The optimal three-phase rotation angle combination was finally obtained through screening: (Phase A: 0°, Phase B: 60°, Phase C: 120°).

[0052] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solutions based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A vacuum interrupter device for a three-phase common-sump high-voltage environmentally friendly GIS, characterized in that, include: The GIS tank and three vacuum interrupters installed inside the GIS tank, each vacuum interrupter corresponding to one phase of the power system; Each vacuum interrupter has a main rotating shaft fitted over the moving end cover and a subordinate rotating shaft fitted over the stationary end cover. The main rotating shaft and the subordinate rotating shaft are connected by a connecting rod. A voltage equalizing capacitor is connected in series on the connecting rod, and voltage equalizing rings are provided at both ends of the voltage equalizing capacitor. An electric field strength sensor is provided at the connection between the connecting rod and the main rotating shaft; An annular drive unit is also provided at the outer end of the moving end cap. The annular drive unit is placed inside the outer shield of the moving end of each vacuum interrupter. The annular drive unit drives the main rotating shaft to rotate, thereby driving the subordinate rotating shaft to rotate. The GIS tank is also equipped with a control unit, which is used to receive the field strength data sensed by the electric field strength sensor, and control the ring drive unit corresponding to each vacuum interrupter to work according to the field strength data, so as to drive the main rotating shaft to rotate and drive the equalizing capacitor to rotate.

2. The vacuum interrupter device of a three-phase common tank environmentally friendly GIS according to claim 1, characterized in that, The ceramic shell and the outer side of the main shield of the vacuum interrupter are each provided with multiple subordinate rotating shafts. Each subordinate rotating shaft is provided with a support member, which is connected to the connecting rod to drive the connecting rod to rotate smoothly.

3. The vacuum interrupter device of a three-phase common tank environmentally friendly GIS according to claim 1 or 2, characterized in that, The connecting rod is composed of multiple connecting rod segments, and four columnar equalizing capacitors are connected in series on the connecting rod. Each columnar equalizing capacitor has a connecting terminal at both ends. The connecting terminal is connected to the connecting rod segment, and the equalizing ring is also provided at the connection between the connecting rod segment and the connecting terminal.

4. The vacuum interrupter device of a three-phase common tank environmentally friendly GIS according to claim 1 or 2, characterized in that, The cylindrical equalizing capacitor is 140mm away from the center of its corresponding vacuum interrupter.

5. The vacuum interrupter device of a three-phase common tank environmentally friendly GIS of claim 2, wherein, The equalizing capacitor, the equalizing ring, the connecting rod, and the support are arranged along the same vertical line; wherein the equalizing capacitor uses a high dielectric constant ceramic based on modified barium titanate as the dielectric, and its dielectric constant is between 4000 and 5000.

6. The vacuum interrupter device of a three-phase common tank environmentally friendly GIS of claim 1, wherein, The moving end cover, stationary end cover, moving end outer shield, stationary end outer shield, equalizing ring, and connecting rod of each vacuum interrupter are made of copper, while the main rotating shaft and the subordinate rotating shaft are made of high-carbon chromium bearing steel.

7. A method for angle adjustment of the grading capacitor of a three-phase common-tank high-voltage environmentally friendly GIS vacuum interrupter device, according to any one of claims 1-6, characterized in that, The control unit receives the field strength data sensed by the electric field strength sensor, and controls the corresponding ring drive unit of each vacuum interrupter to work according to the field strength data, so as to drive the main rotating shaft to rotate and drive the equalizing capacitor to rotate to the angle where the electric field strength sensor senses the minimum value. The steps include: The main rotating shafts of the three vacuum interrupters are controlled to rotate at preset angle intervals within a set angle range, and the electric field intensity of each phase is recorded at each interval angle to form a corresponding electric field intensity data set. The set angle range is from 0 to 180 degrees. From all electric field intensity data sets, find the global minimum electric field intensity value as the first target value, and filter out all electric field intensity data sets that contain the first target value; In the data groups retained after the first round of screening, the second smallest global field strength value is searched as the second target value, and data groups containing the second target value are selected. In the data set retained after the second round of screening, the third smallest global field strength value is selected as the third target value; By mapping the first target value, the second target value, and the third target value to the corresponding three phases, the combination of three-phase rotation angles that minimizes the overall electric field strength can be determined. The ring drive unit corresponding to each vacuum interrupter is controlled according to the three-phase rotation angle group to drive the main rotating shaft to rotate, thereby driving the equalizing capacitor to rotate to the corresponding rotation angle.

8. The method for adjusting the angle of the grading capacitor of the vacuum interrupter device of the three-phase common tank environmentally friendly GIS according to claim 7, characterized in that, If the multisets formed by the first target value, the second target value, and the third target value in the multiple sets of electric field intensity data obtained are equal, the control unit selects the combination arranged in the first preset order as the optimal rotation angle combination.

9. The method for adjusting the angle of the grading capacitor of the vacuum interrupter device of the three-phase common tank environmentally friendly GIS according to claim 7, characterized in that, In the initial position, the centers of each vacuum interrupter and the corresponding equalizing capacitor are all on the same circumference centered on the center of the tank. The control unit rotates the equalizing capacitors corresponding to each vacuum interrupter in a clockwise direction, either phase by phase or simultaneously.

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