CN102983017A - Three-position switch - Google Patents

Abstract

The present invention proposes a three-position switch. The three-position switch includes: a connected vacuum interrupter and a tri-stable permanent magnet operating mechanism. The vacuum interrupter includes: a conductive rod at a moving end; The permanent magnet operating mechanism (7) comprises: a static iron core (21), a moving iron core (23), an upper drive coil (22), a middle drive coil (24), a permanent magnet (25), a lower drive coil (26) and The drive rod (20) connected to the moving iron core (23), the static iron core (21) has an inner cavity, and the inner cavity includes: an upper end surface, a lower end surface, and a There is a cylindrical moving iron core moving space between the lower end faces, the two ends of the driving rod (20) protrude from the inner cavity of the static iron core, and the moving iron core (23) is movably arranged on the The moving iron core is in the moving space and has a first working position, a second working position and a third working position.

Description

Three position switch

technical field

The invention relates to the technical field of electric power distribution equipment, in particular to a three-position switch.

Background technique

The load switch in the ring network cabinet generally requires three positions, that is, three working positions: 1. The closing position where the main breakout of the isolation switch is connected, 2. The isolation position where the main breakout is separated, and 3. The grounding position on the grounding side. The gas generating type, compressed gas type and SF6 type load switch are easy to realize three positions. For vacuum circuit breakers or vacuum load switches, because the vacuum interrupter can only be disconnected and cannot be isolated, a three-position switch is generally added in front of the circuit breaker or load switch of the vacuum ring network cabinet to form an isolation fracture. Three-position switch, English abbreviation 3PS, that is, 3 position switchgear. The three-position switch is often used in fully enclosed combined electrical appliances (GIS) or composite electrical appliances (PASS), and is not a separate product. It is often used in XGN ring network cabinets.

The so-called three-position refers to three working positions: 1. The closing position where the main breakout of the isolation switch is connected, 2. The isolation position where the main breakout is separated, and 3. The grounding position on the grounding side. The three-position switch actually integrates the functions of the isolating switch and the grounding switch, and is completed by a knife, so that a mechanical lock can be realized to prevent the main circuit from being electrified and grounded, because a knife can only be in one position. , unlike the traditional isolating switch, the main knife is the main knife, the ground knife is the ground knife, and there may be misoperation between the two knives. The three-position isolating switch uses a knife, and the working position of a knife is unique at a certain moment, either in the closing position of the main switch, or in the isolation position or the grounding position. In the traditional GIS, the isolating switch and the grounding switch are two functional units, which are controlled by electrical interlocking. Now the latest design uses a three-position isolating switch, which avoids the possibility of misoperation, and compared with the traditional two-position The vacuum interrupter not only simplifies the structure but also reduces the cost.

The existing three-position switch generally uses a spring mechanism to operate the vacuum interrupter. The spring mechanism has the following disadvantages: it relies entirely on mechanical transmission, the structure is complex, and the number of parts is large. Generally, the spring mechanism has hundreds of parts; During work, these parts are prone to wear, corrosion and loss of lubricating oil, which will lead to improper operation due to solidification. In the northeastern region, the lubricating oil solidifies in winter and causes damage to the mechanism. In the northwest and other regions, long-term wind and sand corrosion leads to damage to the mechanism.

Contents of the invention

The purpose of the present invention is to provide a three-position switch to solve the problems of complex structure and inaccurate control caused by the assistance of springs and other components to switch and maintain the three working positions of the existing three-position switch. , especially to solve the problem that the working position needs the assistance of springs and other components in the middle of the static iron core to achieve control.

For this reason, the present invention proposes a three-position switch, the three-position switch includes: a connected vacuum interrupter and a tristable permanent magnet operating mechanism,

The vacuum interrupter includes: a moving end conductive rod;

The permanent magnet operating mechanism 7 includes: a static iron core 21, a moving iron core 23, an upper driving coil 22, a middle driving coil 24, a permanent magnet 25, a lower driving coil 26 and a driving rod connected to the moving iron core 23 20. The static iron core 21 has an inner cavity, and the inner cavity includes: an upper end surface, a lower end surface, and a cylindrical movable iron core moving space between the upper end surface and the lower end surface, and the driving rod 20 protrudes from the inner cavity of the static iron core, and the moving iron core 23 is movably arranged in the moving space of the moving iron core and has a first working position, a second working position and a third working position;

The static iron core 21 also includes: a plurality of annular hollow slots distributed at intervals from top to bottom and respectively surrounding the inner cavity, through which the upper driving coil 22 , the middle driving coil 24 and the lower driving coil 26 pass. The annular hollow grooves are respectively sleeved outside the moving iron core;

The plurality of annular hollow slots are: a first annular hollow slot, a second annular hollow slot and a third annular hollow slot distributed at intervals from top to bottom and respectively surrounding the moving space of the moving iron core. The coil 22 is arranged in the first annular hollow groove, the middle driving coil 24 is arranged in the second annular hollow groove, and the lower driving coil 26 is arranged in the third annular hollow groove; The iron core 21 also includes: a first annular boss 104 that surrounds the inner cavity and separates the first annular cavity and the second annular cavity; and: surrounds the moving iron core movement space and separates The second annular boss 106 of the second annular hollow groove and the third annular hollow groove is provided with the permanent magnet 25 between the second annular boss 106 and the movable iron core moving space. space;

The moving iron core 23 includes: a plurality of grooves distributed at intervals from top to bottom, and a fourth annular boss 204 located in the moving iron core 23 and separating two adjacent grooves; The iron core 23 also includes: a third annular boss 202 and a fifth annular boss 206 respectively located above and below the fourth annular boss 204, and the upper end surface of the moving iron core 23 is located on the third annular boss 204. On the platform 202, the lower end surface of the moving iron core 23 is located on the fifth annular boss 206, and the moving iron core 23 also includes: the third annular boss 202 and the fourth annular boss 204 between the first groove 201 and the second groove 203 between the fourth annular boss 204 and the fifth annular boss 206;

The moving end conducting rod is connected with the driving rod.

Further, in the second working position, the first annular boss and the fourth annular boss are engaged with each other in the radial direction to form a first magnetic circuit, and the fifth annular boss and the second The annular bosses are mutually engaged in the radial direction to form a second magnetic circuit, the first magnetic circuit communicates with the second magnetic circuit, the third annular boss is away from the upper end surface of the inner cavity, and the fifth The annular boss is away from the lower end surface of the inner cavity;

In the third working position, the fifth annular boss is in contact with the lower end surface of the inner cavity to form a third magnetic circuit, and the fifth annular boss and the second annular boss are mutually radially combined to form a fourth magnetic circuit, the third magnetic circuit communicates with the fourth magnetic circuit, the third annular boss is away from the upper end surface of the inner cavity, the fourth annular boss is connected to the first One annular bosses are staggered from each other;

In the first working position, the third annular boss is in contact with the upper end surface of the inner cavity to form a fifth magnetic circuit, and the fifth annular boss and the second annular boss are mutually radially combined to form a sixth magnetic circuit, the fifth magnetic circuit communicates with the sixth magnetic circuit, the third annular boss is staggered from the first annular boss, and the fifth annular boss is away from all The lower end surface of the inner cavity.

Further, the vacuum interrupter includes: a casing with an inner cavity, and a static contact system, a grounding system, and a dynamic contact system between the static contact system and the grounding system are arranged in the inner cavity of the casing. A contact system, the conductive rod at the moving end is connected to the moving contact system.

Further, the casing includes: an insulating casing and a static cover, the insulating casing is divided into two sections, and the two sections of the insulating casing are respectively located on both sides of the static cover and connected through the static cover.

Further, the static contact system includes: a static end conductive rod, a first copper sheet, and a static contact arranged in the inner cavity of the insulating casing and connected in sequence.

Further, the moving contact system includes: a moving isolation contact, a second copper sheet and a moving ground contact connected in sequence.

Further, the grounding system includes: a static grounding contact and an inner cavity grounding ring, the inner cavity grounding ring is connected to the static cover plate, a through hole is provided in the inner cavity grounding ring, and the through hole It accommodates the conductive rod at the movable end to pass through but blocks the passage of the movable ground contact.

Further, the three-position switch further includes: a coupling, and the conductive rod at the moving end is connected to the driving rod through a coupling.

Further, a bellows and a bellows protective cover arranged at the end of the bellows are also provided on the moving end conductive rod.

In the present invention, by arranging a plurality of annular hollow slots, annular bosses and coils in the static iron core and correspondingly setting a plurality of annular bosses in the moving iron core, it can form a stable structure with the permanent magnet and the static iron core in three different working positions. The magnetic circuit, so as to stabilize the moving iron core at these three positions, realize the switching and maintaining of the three working positions of the vacuum interrupter, and avoid the use of complex mechanical structures such as spring structures. The present invention does not need a tripping or locking device, and does not need to add an electrical interlocking device. The operating mechanism has small action dispersion and good controllability. The switch is closed at zero time and the switch is opened when the current crosses zero, thereby reducing the impact of the switching process on related equipment and the power grid, and meeting the smart grid's requirements for intelligent electrical equipment.

Description of drawings

FIG. 1 is a schematic diagram of the overall internal structure of a three-position switch according to an embodiment of the present invention;

2 is a schematic diagram of the structure of the three-position switch in the opening position and the magnetic field distribution of the three-stable permanent magnet operating mechanism in this position according to an embodiment of the present invention;

3 is a schematic diagram of the structure of the three-position switch moving from the opening position to the grounding position and the magnetic field distribution of the tri-stable permanent magnet operating mechanism at this moment according to an embodiment of the present invention;

4 is a schematic diagram of the structure of the three-position switch in the grounding position and the magnetic field distribution of the three-stable permanent magnet operating mechanism in this position according to an embodiment of the present invention;

5 is a schematic diagram of the structure of the three-position switch moving from the grounding position to the opening position and the magnetic field distribution of the tri-stable permanent magnet operating mechanism at this moment according to an embodiment of the present invention.

6 is a schematic diagram of the structure of the three-position switch moving from the opening position to the closing position and the magnetic field distribution of the tristable permanent magnet operating mechanism at this moment according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of the structure of the three-position switch in the closing position and the magnetic field distribution of the three-stable permanent magnet operating mechanism in this position according to an embodiment of the present invention.

8 is a schematic diagram of the structure of the three-position switch moving from the closing position to the opening position and the magnetic field distribution of the tristable permanent magnet operating mechanism at this moment according to an embodiment of the present invention;

Fig. 9 is a schematic diagram of the internal structure of the permanent magnet operating mechanism according to the embodiment of the present invention.

Note: In the above figures, due to the large number of internal lines and labels, for clear and intuitive display, the internal contour lines are still represented by straight lines, and the lines of magnetic force are represented by dotted lines.

Explanation of reference numbers:

1-Magnetic force line 3-Shell 4-Static contact system 5-Moving contact system 6-Grounding system 7-Permanent magnet operating mechanism 8-Vacuum interrupter 14-Coupling

20-drive rod; 21-static iron core; 22-upper drive coil; 23-moving iron core; 24-middle drive coil; 25-permanent magnet; 26-lower drive coil; 1013, the lower end surface of the inner cavity 104, the first annular boss 105, the second annular hollow 106, the second annular boss 201, the first groove 202, the third annular boss 203, the second groove 204, the fourth Annular boss 206, the fifth annular boss 2021, the upper end surface of moving iron core 2061, the lower end surface of moving iron core

31-Insulation shell 32-Static cover 41-Static end conductive rod 43-First copper sheet; 44-Static contact; 51-Moving end conductive rod; 52-Bellow tube protective cover; Dynamic isolation contact; 56-second copper sheet; 57-movable ground contact; 68-(upper surface welding) static ground contact; 69-inner chamber ground ring

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

As shown in Figure 1, the three-position switch according to the embodiment of the present invention includes: a connected vacuum interrupter 8 and a tristable permanent magnet operating mechanism 7, and the vacuum interrupter 8 includes: a moving end conductive rod 51. The main difference between the present invention and the three-position switch of the existing bistable permanent magnet operating mechanism is: the permanent magnet operating mechanism 7 adopted by the present invention is a permanent magnet operating mechanism with three stable states, which is more stable than the existing bistable The state permanent magnet operating mechanism has one more stable state, that is, the permanent magnet operating mechanism 7 adopted in the present invention has three stable working positions, thus making the vacuum interrupter also have three working positions. As for the vacuum interrupter connected to the end of the permanent magnet operating mechanism 7, except that the present invention has three working positions, various existing vacuum interrupters can also be used.

As shown in Figure 9, the permanent magnet operating mechanism 7 includes: a static iron core 21, a moving iron core 23, an upper drive coil 22, a middle drive coil 24, a permanent magnet 25, a lower drive coil 26 and a drive coil connected to the moving iron The driving rod 20 on the core 23, the static iron core 21 has an inner cavity, and the inner cavity includes: an upper end surface, a lower end surface, and a cylindrical moving iron core located between the upper end surface and the lower end surface to move space, the driving rod 20 protrudes from the inner cavity of the static iron core, and the moving iron core 23 is movably arranged in the moving iron core moving space and has a first working position, a second working position and third working position;

In the present embodiment, the second working position is b (or B position), as shown in Fig. 2, 3, 6 and Fig. 9, that is, the moving iron core 23 is in the middle position in the static iron core 21, and this position is neither the moving iron core 23 is in the position (ie position a or A) of the static iron core 21 upper end, nor is the moving iron core 23 in the position (ie position c) of the static iron core 11 lower end, which is one of the differences between the present invention and the prior art. The existing technology can only realize the position of the moving iron core 23 at the upper or lower end of the static iron core 21 through electromagnetic control, and cannot realize the steady state maintenance at the b position, and if the control of mechanical components such as springs is used, the moving iron core 23 is at b position, it will increase the complexity of the structure, and due to the wear and tear of mechanical parts such as springs, it is easy to cause problems such as control errors.

The static iron core 21 also includes: a plurality of annular hollow slots distributed at intervals from top to bottom and respectively surrounding the inner cavity, the annular hollow slots play the role of accommodating the coil, and also play a role when the coil is powered off. The role of spaced magnetic field lines. The upper driving coil 22 , the middle driving coil 24 and the lower driving coil 26 are respectively sleeved outside the moving iron core through the annular hollow slot.

The plurality of annular hollow slots are: a first annular hollow slot, a second annular hollow slot and a third annular hollow slot distributed at intervals from top to bottom and respectively surrounding the moving space of the moving iron core. The coil 22 is arranged in the first annular hollow groove, the middle driving coil 24 is arranged in the second annular hollow groove, and the lower driving coil 26 is arranged in the third annular hollow groove; The iron core 21 also includes: a first annular boss 104 that surrounds the inner cavity and separates the first annular cavity and the second annular cavity; and: surrounds the moving iron core movement space and separates The second annular boss 106 of the second annular hollow groove and the third annular hollow groove is provided with the permanent magnet 25 between the second annular boss 106 and the movable iron core moving space. space;

The moving iron core 23 includes: a plurality of grooves distributed at intervals from top to bottom, and a fourth annular boss 204 located in the moving iron core 23 and separating two adjacent grooves; The iron core 23 also includes: a third annular boss 202 and a fifth annular boss 206 respectively located above and below the fourth annular boss 204, and the upper end surface of the moving iron core 23 is located on the third annular boss 204. On the platform 202, the lower end surface of the moving iron core 23 is located on the fifth annular boss 206, and the moving iron core 23 also includes: the third annular boss 202 and the fourth annular boss 204 between the first groove 201 and the second groove 203 between the fourth annular boss 204 and the fifth annular boss 206;

As shown in Fig. 2 , in the second working position, the first annular boss 104 and the fourth annular boss 204 are engaged with each other in the radial direction (herein, the mating can be fitting, coincidence, suction engagement) or cooperate) to form a first magnetic circuit, the fifth annular boss and the second annular boss are mutually engaged in the radial direction to form a second magnetic circuit, and the first magnetic circuit communicates with the second magnetic circuit , forming a closed magnetic circuit, so the moving iron core 23 is in a steady state position, that is, when the moving iron core is slightly deviated from the position by external disturbance, the magnetic force on the moving iron core 23 will drive it back to the steady state position. At position b (or B), the third annular boss is far away from the upper end surface of the inner chamber, and the fifth annular boss is farther away from the lower end surface of the inner chamber (herein, except for FIG. In the figure, the upper end surface is located on the left side of the figure, the lower end surface is located on the right side of the figure, and the relative position of the upper end surface and the lower end surface is in the left-right direction); that is, the upper end surface 2021 of the moving iron core 23 is far away from the inner cavity The upper end surface 1011 of the moving iron core 23 is far away from the lower end surface 1013 of the inner cavity. There are stronger magnetic force lines between the permanent magnet 25 and the fifth annular boss 206, which form a closed magnetic circuit with the magnetic force lines between the first annular boss 104 and the fourth annular boss 204, and at the same time, the moving iron core 23 There is no magnetic circuit formed between the third annular boss 202 and the static iron core 1 , therefore, the moving iron core 23 can be kept at position b.

In the third working position, as shown in FIG. 9 , (that is, the lower end of the driving rod is at position c), the fifth annular protrusion 206 fits with the lower end surface 2061 of the inner cavity to form a third magnetic circuit, and the fifth The annular boss 206 and the second annular boss 106 are mutually engaged in the radial direction to form a fourth magnetic circuit, the third magnetic circuit communicates with the fourth magnetic circuit, and the third annular boss 202 is far away from the The upper end surface 1011 of the inner cavity, the fourth annular boss 204 and the first annular boss 104 are staggered from each other.

In the first working position (that is, the upper end of the driving rod is at position A in FIG. 9 ), as shown in FIGS. The magnetic circuit, the fifth annular boss 206 and the second annular boss 106 are radially engaged to form a sixth magnetic circuit, the fifth magnetic circuit communicates with the sixth magnetic circuit, and the sixth magnetic circuit communicates with the sixth magnetic circuit. The three annular bosses 202 are radially staggered from the first annular boss 104 , and the fifth annular boss 206 is away from the lower end surface of the inner chamber. Among Fig. 5, there is stronger magnetic field line between permanent magnet 25 and the 5th annular boss 206, and this magnetic field line forms closed magnetic circuit with the magnetic field line between the upper end of static iron core 21 and the 3rd annular boss 202, simultaneously, the first An annular boss 104 does not form a closed magnetic circuit with the fourth annular boss 204 , therefore, the moving iron core 23 can be kept at position a.

The moving end conducting rod 51 is connected to the driving rod 20 . Since the moving iron core 23 has three working positions, the moving end conductive rod 51 connected to the driving rod 20 can have three working positions, and therefore, the vacuum interrupter also has three working positions, which can realize opening and closing. Gate and ground three working positions and mutual switching.

Further, as shown in Fig. 1, the vacuum interrupter 8 includes: an annular shell 3 with an inner cavity, the inner cavity of the shell is provided with a static contact system 4, a grounding system and 6 located in the static The moving contact system 5 between the contact system and the grounding system, the moving end conductive rod 51 is connected to the moving contact system 5 . Through the movement of the conductive rod connection 51 at the moving end, three working positions of opening, closing and grounding can be realized and mutually switched, thus realizing the adjustment of the three working positions of the vacuum interrupter.

Further, as shown in FIG. 1 , the casing package 3 includes: an insulating casing 31 and a static cover 32 , the insulating casing 31 is divided into two sections, and the two sections of the insulating casing are respectively located on both sides of the static cover 32 and are connected through the static cover plate 32 . In this way, the function of grounding can be realized in the vacuum interrupter, the axial space and radial space of the annular shell 3 are fully utilized, and the setting of three working positions is realized.

Further, as shown in FIG. 1 , the static contact system 4 includes: a static end conductive rod 41, a first copper sheet 43 and a static contact 44 arranged in the inner cavity of the insulating casing and connected in sequence, the first The copper sheet 43 and the fixed contact 44 are disk-shaped structures, extending radially of the inner cavity, so as to be connected with the moving contact system 6 . The conductive rod 41 at the static end extends along the axial direction of the inner cavity, and can be electrically connected with the outside. The static contact 44 can be made of copper-chromium alloy or oxygen-free copper, and is used for connecting the moving isolation contact 55 .

Further, as shown in FIG. 1 , the moving contact system 5 includes: a moving isolation contact 55, a second copper sheet 56, and a moving ground contact 57 sequentially connected to form a disk-shaped structure extending radially along the inner cavity, In order to connect the movable isolation contact 55 and the movable ground contact 57 with the static contact system 4 and the ground system 6 respectively. The material of the dynamic isolation contact 55 can be made of copper-tungsten alloy or oxygen-free copper.

Further, as shown in FIG. 1 , the grounding system 6 includes: a static grounding contact 68 extending radially along the inner cavity and an inner cavity grounding ring 69 , and the inner cavity grounding ring 69 is connected to the static cover plate 32 and the diameter of the inner chamber grounding ring 69 is larger than that of the static cover plate 32 for grounding. A through hole is provided in the inner cavity grounding ring, and the through hole accommodates the passage of the movable end conductive rod 51 but blocks the passage of the movable ground contact 57 so as to limit the position of the movable ground contact 57 and maintain the position of the ground position. Stablize. The static ground contact 68 may be made of copper chromium alloy or oxygen-free copper.

Further, as shown in FIG. 1 , the three-position switch further includes: a coupling 14, the conductive rod 51 at the moving end is connected to the driving rod 20 through the coupling, and the connection is stable and convenient.

Further, as shown in FIG. 1 , a bellows 53 and a bellows protective cover 52 arranged at the end of the bellows 53 are further provided on the moving end conductive rod 51 to realize arc extinguishing. The bellows protective cover 52 protects the end of the bellows 53 from impact.

When the driving rod 20 drives the switch to be stable at the opening position, as shown in Figure 2, at this time, the tristable permanent magnet operating structure 7 is stable at the b position, and the magnetic flux generated by the permanent magnet is mainly composed of the static iron core 21 Pass through the magnetic circuit of the boss provided on the moving iron core 20 and the boss or groove provided on the moving iron core 20. The driving rod 20 and the moving iron core 23 are moved to the left end from the position shown in FIG. Together with the permanent magnet 25 to form a closed magnetic circuit, the driving rod 20 can drive the vacuum interrupter 8 to stabilize at the closing position. In the same way, the driving rod 20 and the moving iron core 23 move to the right end from the position shown in Figure 2, so that the end surface (lower end surface 1013 in Figure 9) at the right end of the moving iron core and the inner wall part near the right end of the static iron core 16 are attracted together , form a closed magnetic circuit together with the permanent magnet 25, and at this time, the driving rod 20 can drive the vacuum interrupter 8 to stabilize at the grounding position.

The specific working principle and magnetic field distribution of the three-position switch of the present invention will be described below. The magnetization direction of the permanent magnet 25 on the lower side in Fig. 2 is vertically downward, and the magnetization direction of the upper permanent magnet is vertically upward. Define the positive direction when the current in the lower half of the coil flows out of the paper and the current in the upper half of the coil flows into the paper in Figure 2. When the moving iron core 23 is in the opening position of the switch shown in Figure 2 and all coils are not powered, the magnetic field distribution of the tristable permanent magnet mechanism in a novel three-position switch according to the present invention (magnetic field line 1) as shown in picture 2.

Apparently, the moving iron core 23 is in a steady state position at this time, that is, when the moving iron core is slightly deviated from this position by external disturbance, the magnetic force on the moving iron core will drive it back to the steady state position. In this steady position, forward current is applied to the lower drive coil 26, and the other coils are not energized, and the moving iron core 23 is subjected to a rightward magnetic force, driving the driving rod 20 to start driving the moving end conductive rod 51 in the vacuum interrupter. Moving to the grounding position, the schematic diagram of the magnetic field distribution of the mechanism at this time is shown in Figure 3.

Subsequently, the moving iron core 23 drives the moving end conductive rod 51 in the three-station vacuum interrupter to move to the grounding position, cutting off the current of all coils, and the moving iron core 23 is attracted by the magnetic field force provided by the permanent magnet. The right end of the static iron core 21, so that the moving ground contact 57 of the three-station vacuum interrupter is in contact with the static ground contact 68, thereby stabilizing at the grounding position. At this time, the schematic diagram of the magnetic field distribution of the mechanism is shown in Figure 4. Obviously this position is a stable position, and the attraction force of the permanent magnet will provide the stronger holding force required for closing the switch.

Then, in the lower driving coil 26 and the middle driving coil 24, the currents in the opposite direction are respectively introduced, and the magnetic field of the mechanism will be shown in Fig. 5 respectively. The conductive rod 51 at the moving end moves to the opening position, so as to return to the switch position and the opening position.

When the moving iron core 23 and the driving rod 20 make the switch stable at the position of opening, the reverse current is passed to the left driving coil 22, and the other coils are not energized, and the moving iron core 23 will start to drive the vacuum interrupter under the action of the magnetic field force. The conductive rod 51 at the moving end moves to the closing position, and the schematic diagram of the magnetic field distribution of the mechanism at this time is shown in FIG. 6 .

Subsequently, the moving iron core 23 drives the driving rod 20 to move so that the moving isolation contact 55 contacts the static contact 44, the switch is in the closing position, and the current of all coils is cut off. The lower suction is on the left end of the static iron core 21, so that the switch is stable at the closing position. At this time, the magnetic field distribution diagram of the mechanism is shown in Figure 7. Obviously, this position is a stable position, and the suction force of the permanent magnet will be Provides the holding force required to close the switch.

Then, pass forward current respectively in the left driving coil 22 and the middle driving coil 24, the magnetic field of the mechanism will be shown in Fig. The moving end conductive rod 51 in the arc chamber moves to the opening position, so that the switch returns to the opening position. So far, the institution has completed a complete working cycle.

Wherein, the driving coil 24 may not be arranged in the second annular hollow groove 105 . Preferably, the driving coil 24 in the setting of the present invention can switch the working position more sensitively.

The three-position switch of the present invention has the following advantages: avoiding the use of complex mechanical structures such as spring structures, the drive rod can be stabilized at three positions by closing the magnetic circuit, and the switching of the three positions of the vacuum interrupter is realized. The operating mechanism is simple in structure, small in size and high in reliability; the operating mechanism has small action dispersion and good controllability, and can select the best closing time according to the power grid and load operating conditions to realize closing when the voltage crosses zero. The gate is opened when the current crosses zero, thereby reducing the impact of the switching process on related equipment and the power grid, and meeting the smart grid's requirements for intelligent electrical equipment.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Because the various components of the present invention can be combined with each other under the condition of no conflict, any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall belong to the protection of the present invention. range.

Claims (9)

1. a three-station is characterized in that, described three-station comprises: the vacuum interrupter that is connected and three-stable state permanent-magnet manipulating mechanism,

Described vacuum interrupter comprises: the moved end conducting rod;

Described permanent-magnet operating mechanism (7) comprising: static iron core (21), moving iron core (23), upper drive coil (22), middle drive coil (24), permanent magnet (25), lower drive coil (26) and be connected to drive rod (20) on the described moving iron core (23), described static iron core (21) has inner chamber, described inner chamber comprises: the upper surface, the moving iron core mobile space of lower surface and the cylindricality between described upper surface and described lower surface, described drive rod (20) stretches out from the inner chamber of described static iron core, and described moving iron core (23) is mobile to be arranged in the described moving iron core mobile space and to have the first service position, the second service position and the 3rd service position;

Described static iron core (21) also comprises: spaced apart and be enclosed in respectively the outer a plurality of annular dead slot of described inner chamber from top to bottom, described upper drive coil (22), middle drive coil (24) and described lower drive coil (26) are set in respectively outside the described moving iron core by described annular dead slot;

Described a plurality of annular dead slot is: spaced apart and be enclosed in respectively described moving iron core mobile space outer the first annular dead slot, the second annular dead slot and the 3rd annular dead slot from top to bottom, described upper drive coil (22) is arranged in the described first annular dead slot, described middle drive coil (24) is arranged in the described second annular dead slot, and described lower drive coil (26) is arranged in the described the 3rd annular dead slot; Described static iron core (21) also comprises: it is outer and separate first annular boss (104) of the described first annular dead slot and the second annular dead slot to be enclosed in described inner chamber; And: it is outer and separate second annular boss (106) of the described second annular dead slot and described the 3rd annular dead slot to be enclosed in described moving iron core mobile space, is provided with the space that holds described permanent magnet (25) between described the second annular boss (106) and the described moving iron core mobile space;

Described moving iron core (23) comprising: from top to bottom a plurality of grooves spaced apart, and the Fourth Ring shape boss (204) that is arranged in described moving iron core (23) and two described grooves of separating adjacent; Described moving iron core (23) also comprises: the 3rd annular boss (202) and the five rings shape boss (206) that lay respectively at described Fourth Ring shape boss (204) above and below, the upper surface of described moving iron core (23) is positioned on described the 3rd annular boss (202), the lower surface of described moving iron core (23) is positioned on the described five rings shape boss (206), and described moving iron core (23) also comprises: be positioned at the first groove (201) between described the 3rd annular boss (202) and the described Fourth Ring shape boss (204) and be positioned at the second groove (203) between described Fourth Ring shape boss (204) and the described five rings shape boss (206);

Described moved end conducting rod is connected with described drive rod.

2. three-station as claimed in claim 1 is characterized in that,

In described the second service position, described the first annular boss and described Fourth Ring shape boss are combined to form the first magnetic circuit diametrically mutually, described five rings shape boss and described the second annular boss are combined to form the second magnetic circuit diametrically mutually, described the first magnetic circuit and described the second communicated magnetic circuit, described the 3rd annular boss is away from the upper surface of described inner chamber, and described five rings shape boss is away from the lower surface of described inner chamber;

In described the 3rd service position, fit and form the 3rd magnetic circuit in the lower surface of described five rings shape boss and described inner chamber, described five rings shape boss and described the second annular boss are combined to form the 4th magnetic circuit diametrically mutually, described the 3rd magnetic circuit and described the 4th communicated magnetic circuit, described the 3rd annular boss is away from the upper surface of described inner chamber, and described Fourth Ring shape boss and described the first annular boss stagger mutually;

In described the first service position, fit and form the 5th magnetic circuit in the upper surface of described the 3rd annular boss and described inner chamber, described five rings shape boss and described the second annular boss are combined to form the 6th magnetic circuit diametrically mutually, described the 5th magnetic circuit and described the 6th communicated magnetic circuit, described the 3rd annular boss and described the first annular boss stagger mutually, and described five rings shape boss is away from the lower surface of described inner chamber.

3. three-station as claimed in claim 1 or 2, it is characterized in that, described vacuum interrupter comprises: the shell with internal cavities, be provided with static contact system, grounding system and the movable contact system between described static contact system and grounding system in the internal cavities of described shell, described moved end conducting rod is connected on the described movable contact system.

4. three-station as claimed in claim 3 is characterized in that, described shell comprises: insulation crust and quiet cover plate, described insulation crust are divided into two sections, and two sections described insulation crusts lay respectively at the both sides of described quiet cover plate and couple together by described quiet cover plate.

5. three-station as claimed in claim 3 is characterized in that, described static contact system comprises: be arranged on the quiet end conducting rod, the first copper sheet and the fixed contact that connect successively in the internal cavities of described insulation crust.

6. three-station as claimed in claim 3 is characterized in that, described movable contact system comprises: the moving insulating contact, the second copper sheet and the moving grounding contact that connect successively.

7. three-station as claimed in claim 4, it is characterized in that, described grounding system comprises: static ground contact and inner chamber ground loop, described inner chamber ground loop is connected on the described quiet cover plate, be provided with through hole in the described inner chamber ground loop, described through hole hold described moved end conducting rod by but block described moving grounding contact and pass through.

8. three-station as claimed in claim 1 or 2 is characterized in that, described three-station also comprises: shaft coupling, described moved end conducting rod is connected by shaft coupling with described drive rod.

9. three-station as claimed in claim 1 or 2 is characterized in that, the protective cover for corrugated pipe that also is provided with bellows and is arranged on described corrugated tube end on the conducting rod of described moved end.

Images