Abstract
A three-position vacuum switch for realizing external grounding of a load side by using a connected busbar overcomes the problems in the prior art that load side grounding is realized depending on the opening and closing of a vacuum arc extinguishing chamber, a misoperation easily occurs because an operator cannot see the grounding situation intuitively, and when an operating mechanism machine has a problem, it needs to have a grounding line plugged in externally, which cause inconvenient operations and huge safety risks, characterized in that a connected busbar is hinged on front and back sides of a load socket, the vacuum arc extinguishing chamber is connected to the connected busbar by using a pin, the connected busbar is electrically connected to a grounding socket to realize primary grounding, and the vacuum arc extinguishing chamber is electrically connected to the grounding socket to realize auxiliary grounding.
Claims
1. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar comprising a conductive seat (1), a vacuum interrupter (2), a load seat (3), a grounding seat (5) and a drive shaft (6), is characterized in that: The connecting busbar (4) is hinged in the front and rear sides of the load seat (3); the end of the connecting busbar (4) is fixedly connected with the drive shaft (6), and the top of the section outside the insulating cylinder (2-5) exposed to the moving conductor (2-3) of the vacuum interrupter (2) is connected with the connecting busbar by pin shaft; the return spring (8) is arranged between the pin shaft (7) and moving conductor (8); the limit spring (9) is arranged on the movable end of connecting busbar (4).
2. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar of claim 1 is characterized in that: The rotating vacuum interrupter (2) and connecting busbar (4) realize the main line breaking and the functions of three-position switch; the connecting busbar (4) and grounding seat (5) are electrically connected to realize the main grounding; the vacuum interrupter (2) and grounding seat (5) are electrically connected to realize the auxiliary grounding.
3. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar of claim 1 is characterized in that: When the static plug (2-1-1) on the static conductor (2-1) of the vacuum interrupter (2) is positioned between the conductor seat (1) and the grounding seat (5), a middle position (i.e. an isolation position and a grounding position) is formed on the three-position switch; a visual grounding fracture is formed on the three-position switch between the static plug (2-1-1) on the static conductor (2-1) and the grounding seat (5).
4. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar of claim 1 is characterized in that: The vacuum interrupter (2) is separated from the conductive seat (1) to realize the isolation position, as well as to realize the self-closing under the self-closing forces and to realize the reset after breaking relying on the return spring (8) and the limit spring (9).
5. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar of claim 1 is characterized in that: The vacuum interrupter (2) breaking and connecting busbars (4) rotation in realizing of the functions of three-position switch are driven by a driving mechanism.
6. A three-position vacuum switch for realizing load-side external grounding utilizing connecting busbar of claim 3 is characterized in that: The vacuum interrupter (2) is to only withstand the breaking process; the insulating gas is to withstand the power frequency and lightning impulse withstand voltage.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a diagram of the line conducting structure of the invention;
[0019] FIG. 2 is a top view of FIG. 1;
[0020] FIG. 3 is a diagram of the lines of the invention in breaking and in isolation closing, and to be opened;
[0021] FIG. 4 is a diagram of the lines of the invention in breaking and the vacuum interrupter in self-closing.
[0022] FIG. 5 is a diagram of the lines of the invention in breaking and the vacuum interrupter reset.
[0023] FIG. 6 is a diagram of the lines of the invention in breaking and in the load-side grounding.
[0024] As shown in FIGS.
[0025] 1. Conductive pads;
[0026] 2. Vacuum interrupter;
[0027] 2-1. Static conductor; 2-1-1. Static plug; 2-2. Static contact;
[0028] 2-3. Moving conductor; 2-4. Moving contact;
[0029] 2-5 Insulating cylinder; 2-6. Static cover;
[0030] 2-7. Moving cover; 2-8. Bellows;
[0031] 3. Load seat; 4. Connecting busbar; 5. Grounding seat; 6. Driving shaft;
[0032] 7. Pin shaft; 8. Return spring; 9. Limit spring;
DETAILED DESCRIPTION OF THE INVENTION
[0033] The embodiments of the invention are given in FIGS.
[0034] As shown in FIG. 1 and FIG. 2, the invention comprises a conductive seat 1, a vacuum interrupter 2, a load seat 3, a grounding seat 5 and a drive shaft 6; the connecting busbar 4 is hinged in the front and rear sides of the load seat 3; the end of the connecting busbar 4 is fixedly connected with the drive shaft 6, and the connecting busbar rotates with the center of driving shaft 6 under the action of operating mechanism; the vacuum interrupter 2 is composed a moving conductor 2-3, the moving contacts 2-4 and the static conductor 2-1, the static contacts 2-2, a insulation cylinder 2-5, a static cover 2-6, a moving cover 2-7 and bellows 2-8; the moving conductor 2-3 and moving contacts 2-4 are welded into a whole, and the part of moving conductor 2-3 is exposed outside the insulating cylinder 2-5; the top of the section outside the insulating cylinder 2-5 exposed to the moving conductor 2-3 is connected with the connecting busbar 4 by pin shaft 7; the return spring 8 is arranged between the pin shaft 7 and moving conductor 2-3; the end of the reset spring 8 is connected to the pin shaft 7 and the other end is connected to the moving conductor 2-3; also the limit spring 9 is arranged on the movable end of connecting busbar 4; the section of the moving conductor 2-3 welded with the moving contacts 2-4 is positioned in the insulating cylinder 2-5; the moving cover 2-7 is welded at the lower end of the insulating cylinder 2-5; also the bellows 2-8 are welded between the moving cover 2-7 and the moving conductor 2-3 to form a sealing structure; the static conductor 2-1 and the static contacts 2-2 are welded into a whole; and the part of the static conductor 2-1 is exposed outside the insulating cylinder 2-5; the static conductor contacts 2-1-1 are welded at the top of the section outside the insulating cylinder 2-5 exposed to the static conductor 2-1; the section of static conductor 2-1 welded with the static contacts 2-2 is positioned in the sealing insulating cylinder 2-5; the static cover 2-6 is welded at the upper end of the insulating cylinder 2-5; the static conductor 2-1 is welded in the center hole on the static cover 2-6 to form a sealing structure; the vacuum interrupter 2 is in vacuum state when using; the moving contacts 2-4 move in the insulating cylinder 2-5 in a straight line driven by the moving conductor 2-3, to realize line breaking and conducting;
[0035] As shown in FIG. 5, an isolating fracture is formed on the three-position switch between the conductive seat 1 and the static plug 2-1-1 on the static conductor 2-1; when the static plug 2-1-1 on the static conductor 2-1 is positioned between the conductor seat 1 and the grounding seat 5, a middle position (i.e. an isolation position and a grounding position) is formed on the three-position switch. A visual grounding fracture is formed on the three-position switch between the static plug 2-1-1 on the static conductor 2-1 and the grounding seat 5; when the static conductor contacts 2-1-1 on the static conductor 2-1 are positioned between the line contacts 1-1 on the line buses 1 and the grounding static contacts 4-1-1 on the grounding static conductor 4-1, a middle position (i.e. an isolation position and a grounding position) is formed on the three-position switch; a visual grounding fracture is formed on the three-position switch between the static conductor contacts 2-1-1 on the static conductor 2-1 and the grounding static contacts 4-1-1 on the grounding static conductor 4-1.
[0036] The vacuum interrupter 2 is to only withstand the breaking process. The insulating gas is to withstand the power frequency and lightning impulse withstand voltage.
[0037] Utilizing procedures are described as below.
[0038] Step in FIG. 1 shows a conducting state; the vacuum interrupter 2 is in the closing position; the conductive seat 1 and the static plug on the static conductor 2-1 are plug-connected to realize the three-position switch isolation;
[0039] Step 2 in FIG. 3 shows a state of lines in breaking, in isolation closing, and to be opened; at this time, the connecting busbar 4 rotates to the middle position, and the moving contacts 2-4 and the static contacts 2-2 are opened, so that the lines are in breaking; the load-side is not charged, three-position switch is still in isolation closing and to be opened, that is the static plug 2-1-1 on the static conductor 2-1 and the conductive seat 1 are to be released and opened.
[0040] Step 3 in FIG. 4 shows a state of lines of the invention in breaking and the vacuum interrupter in self-closing; the three-position switch in the middle position, i.e. isolation positing and grounding position; at this time, the static plug 2-1-1 on the static conductor 2-1 and the conductive seat 1 are thoroughly opened to realize the isolation position; as well as to make the vacuum interrupter 2 move to the connecting busbar 4 under the action of the return spring 8; to realize the self-closing under the self-closing forces;
[0041] Step 4 in FIG. 5 shows is a state of the lines of the invention in breaking and the vacuum interrupter reset; at this time, the vacuum interrupter 2 rotates to the connecting busbar 4 parallel, i.e. the vacuum interrupter reset state, and the will not overshoot ensured by limit spring 9 when the vacuum interrupter 2 is reset and will not rebound ensured by limit spring 9 after the vacuum interrupter 2 is reset;
[0042] Step 5 in FIG. 6 shows a state of the lines of the invention in breaking and in the load-side grounding; at this time, the static plug 2-1-1 on the static conductor 2-1 is connected with the connecting busbar 4 and the grounding seat 5, to realize the load grounding, i.e. three-position switch grounding closing position, not only realizing the main grounding with the connecting busbar 4 as the external grounding, i.e. the operator visual grounding, but also realizing the auxiliary grounding with the vacuum interrupter 2 as the internal grounding, thereby omitting the cited patents the last step of CN200710103519.2, that is, after the static conductor is grounded, and then the vacuum interrupter is closed to realize the load grounding, so this patent is not only has the main operator visual grounding, but also has the self-closing auxiliary grounding of vacuum interrupter, so that the invention is safe and reliable and its structure is simple.
[0043] The conductive seat 1, static conductor 2-1, static plug 2-1-1, static contact 2-2, moving conductor 2-3, moving contacts 2-4, load seat 3, connecting busbar 4, grounding seat 5 are all good conductors.
