CN104882307A - Isolating switch operating mechanism of solid insulating ring main unit - Google Patents

Abstract

The invention discloses an isolating switch operating mechanism of a solid insulating ring main unit. The operating mechanism comprises an isolating switch driving shaft, a driving gear, a driven gear A, a driven gear B, a transition gear A, and a transition gear B. The driving gear is fixedly arranged on the isolating switch driving shaft. The driven gear A is meshed with the driving gear and the transition gear A. The transition gear B is meshed with the transition gear A and the driven gear B. The driven gear A and the driven gear B are respectively fixedly connected with a rod A and a rod B. The extending ends of the rod A and the rod B are respectively hinged with one end of a rod C and one end of a rod D. the other end of the rod C and the other end of the rod D are hinged together, and are connected with the upper end of an intermediate component. The lower end of the intermediate component is connected with a three-phase grounding shaft. The rod A, the rod B, the rod C, and the rod D form a rhombus. The transition gear A and the transition gear B are in the rhombus. The isolating switch operating mechanism can make distance H between a ground shaft and the lower grounding end of a fuse larger than or equal to 125 mm under the condition that other structures of an existing solid insulating ring main unit are not changed.

Description

A kind of isolator operating mechanism of solid insulation ring main unit

Technical field

The present invention relates to a kind of isolator operating mechanism of solid insulation ring main unit, for on-load switch in 12KV solid insulation ring main unit--electric conductor ground connection under the fuse in fuse combined electric apparatus scheme.

Background technology

Solid insulation ring main unit is the new product of State Power Corporation's recommendation in recent years, the representational scheme of its most is on-load switch--fuse combined electric apparatus scheme, the general structure of its core cell is shown in Fig. 1, is made up of load switch body 2, transmission case 1, isolator operating mechanism 5, fuse assembly 4 and frame 3.As shown in Figure 2 and Figure 3, when ring main unit runs, electric current inputs from upper electric conductor 2 structure of fuse general assembly, is exported to lower electric conductor 5 by upper fingertip 1, melt 3, lower fingertip 4.In switch-fuse combination scheme, in order to ensure personal safety when overhauling, require on-load switch separating brake before maintenance, major loop ground switch closes a floodgate, and the lower electric conductor 5 of fuse should be able to reliable ground.Under fuse, ground connection being of electric conductor is abutted against the earth's axis 6 and is inserted and wherein realize.Fig. 2 is ground state, and now grounding shaft 6 inserts in lower electric conductor 5, and electric conductor 5 ground connection under fuse, ensures safety during maintenance; Fig. 3 is ground connection off-state, and now grounding shaft 6 is separated with lower electric conductor 5, and ring main unit can be energized operation.

Existing solid insulation ring main unit Problems existing is: when ring main unit runs, fuse grounding shaft should depart from lower electric conductor, and form a fracture, this fracture must meet insulation conditions relatively.If adopt air insulation between fracture, then the fracture distance H (Fig. 3) under grounding shaft and fuse between earth terminal should be not less than 125mm, the safety that guarantee equipment runs.But what adopt due to the straight-line mechanism linked with isolator operating mechanism is rocking bar-double-slider structure, as shown in Figure 4, do not interfere with the parts 3 of isolator operating mechanism 1 when swinging to upper end to make connecting lever 4, the total angle of its upper and lower swing can not more than 72 °, and the movement travel that grounding shaft 2 can obtain is only 78mm.In order to ensure there are enough insulation between electric conductor under grounding shaft 2 and fuse, being forced in injection transformer oil in secondary cylinder 8 shown in Fig. 3 and forming compound inslation.But adopt transformer oil not meet the concept of solid insulation, also run counter to the requirement of high-voltage switch gear non-oil ultra high vacuum system.If particularly secondary cylinder internal cause condensation and ponding, causes serious accident possibly.

Summary of the invention

The object of the present invention is to provide a kind of other structure without the need to changing existing solid insulation ring main unit, just can make the isolator operating mechanism of the solid insulation ring main unit of the distance H >=125mm under grounding shaft and fuse between earth terminal.

The isolator operating mechanism of solid insulation ring main unit provided by the invention comprises isolating switch driving shaft, driving gear, driven gear A, driven gear B, transition gear A and transition gear B, driving gear is fixedly mounted on isolating switch driving shaft, driven gear A engages with driving gear and transition gear A simultaneously, transition gear B engages with transition gear A and driven gear B simultaneously, driven gear A and driven gear B are fixedly connected with bar A and bar B respectively, the external part of bar A and bar B is hinged with one end of bar C and bar D respectively, bar C is hinged with the other end of bar D and be connected with the upper end of intermediate member simultaneously, the lower end of intermediate member is connected with three-phase ground axle, described bar A, bar B, bar C and bar D form rhombus (left-half of rhombus and right half part are positioned at former and later two planes), and transition gear A and transition gear B is positioned at rhombus.

The body design of straight-line mechanism is a rhombus-mechanism by the present invention, and by this mechanism design in isolator operating mechanism, become a part for isolator operating mechanism, the force piece of rhombus-mechanism is isolating switch driving shaft, when clockwise or when being rotated counterclockwise isolating switch driving shaft, can, by power and Movement transmit to rhombus-mechanism, make the rectilinear motion of rhombus-mechanism point do upper and lower motion by series of gears transmission, thus drive fuse grounding shaft and lower electric conductor disconnect or connect.

Obtain the rectilinear motion of contact normally, a lot of transmission scheme can be had realize.But due to isolating switch spring operating mechanism inside structure closely, leave our space of design for very little, therefore the present invention adopts and straight-line mechanism is designed to rhombus-mechanism and incorporates the rectilinear motion being grounded axle in spring operating mechanism.

Operation principle below by rhombus-mechanism analyzes feasibility of the present invention further.

As shown in Figure 5, the O that sets up an office is the driving shaft of mechanism, and AO is the connecting rod be enclosed within axle, and AB is the connecting rod hinged with AO.When the two opposing rotations of lever, angle α and θ increases, and β reduces, and some B declines along the median perpendicular of mechanism.Get one group of mechanism OAB, it is equivalent to one group of rocking bar-slide block mechanism, and another group relative with it plays slide block and guide rail to it.In fact these two groups identical mechanisms are conditional.Consider

$\stackrel{\‾}{OA}=\stackrel{\‾}{A}\stackrel{\‾}{B}=l$

α＝θ

So y=2lcos α (1)

dH＝-dy＝2lsinαdα

$\frac{dH}{d\mathrm{\α}}=2l\sin \mathrm{\α}---\left(2\right)$

Stroke $H=\∫dH={\∫}_{{\mathrm{\α}}_1}^{{\mathrm{\α}}_2}2lsin\mathrm{\α}d\mathrm{\α}=2l({\mathrm{cos\α}}_2-{\mathrm{cos\α}}_1)---\left(3\right)$

Work as α ₁=72 °, α ₂=44 °, during l=153mm, H=125.55mm.α can change between 44 ° ~ 76 ° in theory, works as α ₁during > 76 °, l will interfere with isolating switch driving shaft, work as α ₂during < 44 °, the axle with transition gear interferes by l.Consider the impact such as foozle and gap, α is preferably no more than 72 °.

As can be seen here, suitably choose the length of connecting rod and the scope of angle, just can design the straight-line mechanism meeting stroke.The length of connecting rod and the value of angle should not interfere as principle with the parts in isolating switch mechanism.

Above-mentioned two AO connecting rods are just equivalent to bar A in the present invention and bar B, and two AB connecting rods are just equivalent to bar C in the present invention and bar D.

The present invention is by being rhombus-mechanism by the body design of straight-line mechanism, and incorporated in isolator operating mechanism, can when not changing other structure of existing solid insulation ring main unit, make the distance H >=125mm between earth terminal under grounding shaft and fuse, thus effectively can solve and use oil-insulated problem, ensure the safety that equipment runs.

Accompanying drawing explanation

Fig. 1 is the overall construction drawing of solid insulation ring main unit.

Fig. 2 is the structural representation that fuse is in ground state.

Fig. 3 is the structural representation that fuse is in ground connection off-state.

Fig. 4 is the structural representation of existing solid insulation ring main unit straight-line mechanism part.

Fig. 5 is the principle sketch of rhombus-mechanism.

Fig. 6 is that schematic diagram is looked on an assembly structure left side for rhombus-mechanism part of the present invention.

Fig. 7 is the assembly structure schematic front view of rhombus-mechanism part of the present invention.

Fig. 8 is the structural representation of fuse ground connection operation.

In Fig. 1: 1-transmission case, 2-load switch body, 3-frame, 4-fuse assembly, 5-isolator operating mechanism

In Fig. 2, Fig. 3: 1-upper fingertip 2-upper electric conductor 3-melt 4-lower fingertip 5-lower electric conductor 6-grounding shaft 7-secondary cylinder

In Fig. 4: 1-isolator operating mechanism, 2-grounding shaft, 3-in-house parts 4-connecting lever

In Fig. 6, Fig. 7, Fig. 8: 1-isolating switch driving shaft, 2-driven gear A3-driving gear 4-driven gear B 5-transition gear A 6-transition gear B7-bar A 8-bar B 9-bar C 10-bar D 11-intermediate member 12-grounding shaft

Embodiment

As Fig. 6, Fig. 7, shown in Fig. 8, the present invention includes isolating switch driving shaft 1, driven gear A2, driving gear 3, driven gear B4, transition gear A5, transition gear B6, bar A7, bar B8, bar C9 and bar C10, driving gear 3 is fixedly mounted on isolating switch driving shaft 1, driven gear A2 engages with driving gear 3 and transition gear A5 simultaneously, transition gear B6 engages with transition gear A5 and driven gear B4 simultaneously, driven gear A2 and driven gear B4 are fixedly connected with bar A7 and bar B8 respectively, the external part of bar A7 and bar B8 is hinged with one end of bar 9C and bar D10 respectively, bar C9 is hinged with the other end of bar D10 and be connected with the upper end of intermediate member 11 simultaneously, the lower end of intermediate member 11 is connected with three-phase ground axle 12, described bar A7, bar B8, bar C9 and bar D10 form rhombus (see for rhombus in view, actual bar A7, bar C9 and bar B8, bar D10 are on former and later two faces), and transition gear A5 and transition gear B6 is positioned at the scope that rhombus surrounds.Described bar A7 and bar B8 can not interfere with the driving shaft of isolating switch when swinging upwards into extreme position, can not interfere when swinging to extreme position downwards with the axle of transition gear A5 and transition gear B6.

The course of work of the present invention is: when isolating switch driving shaft 1 rotates, driving gear 3 rotates, and drive driven gear A2 to rotate, motion is passed to transition gear A5 by driven gear A2 successively, transition gear B6 and driven gear B4, because driven gear A2 and driven gear B4 is identical gear, therefore when isolating switch driving shaft 1 is done counterclockwise or rotated clockwise, bar A7 and bar B8 does in opposite directions or opposing swing, thus make the tie point P work rectilinear motion downward or upward of bar C9 and bar D10, when a P moves downward, grounding shaft 12 to insert under fuse in electric conductor, lower electric conductor reliable ground, and when some P moves upward, grounding shaft 12 departs from lower electric conductor, and between grounding shaft 12 and lower electric conductor, form the fracture of H >=125mm, the requirement of insulating between fracture can be met.

In the present embodiment, if the length of bar A7, bar B8, bar 9C and bar D10 is 160mm, bar A7, it is 44 ° with the initial swing angle of bar B8, now grounding shaft 12 inserts in lower electric conductor, as bar A7, with when the pendulum angle of bar B8 is 72 °, the distance that grounding shaft 12 moves up can reach 131mm, can meet the requirement of insulating between fracture completely.

The above is only the good embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any transformation of carrying out based on technical scheme provided by the present invention and inventive concept and replacing all should be encompassed in protection scope of the present invention.

Claims (1)

1. the isolator operating mechanism of a solid insulation ring main unit, comprise isolating switch driving shaft, driving gear, driven gear A, driven gear B, transition gear A and transition gear B, driving gear is fixedly mounted on isolating switch driving shaft, driven gear A engages with driving gear and transition gear A simultaneously, transition gear B engages with transition gear A and driven gear B simultaneously, it is characterized in that: driven gear A and driven gear B is fixedly connected with respectively bar A and bar B, the external part of bar A and bar B is hinged with one end of bar C and bar D respectively, bar C is hinged with the other end of bar D and be connected with the upper end of intermediate member simultaneously, the lower end of intermediate member is connected with three-phase ground axle, described bar A, bar B, bar C and bar D form rhombus, and transition gear A and transition gear B is positioned at rhombus.